| Author |
Message |
    
Bushpilot169
Junior Member
Username: Bushpilot169
Post Number: 20
Registered: 2-2004
| | Posted on Sunday, July 04, 2004 - 9:29 pm: | 
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I was looking through some of the past post's
and saw a swing mod for a cobra 29ltd, i was
wondering if that same mod would work for a
uniden pc76wxl? If it will what is the jumper #
i need to remove? |
Boxcar
Intermediate Member
Username: Boxcar
Post Number: 295
Registered: 4-2002
| | Posted on Monday, July 05, 2004 - 9:17 pm: |
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I don't belive so. They have different boards. There should be a swing mod for it but I have no idea which jumper you would have to change out like the 29. You might ask on the open forum and see what comes up. |
Bushpilot169
Junior Member
Username: Bushpilot169
Post Number: 22
Registered: 2-2004
| | Posted on Tuesday, July 06, 2004 - 3:01 pm: |
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hay boxcar
just to let you know it will work. i did'nt know the jumper # so i just looked for the jumper that was in font of the final, then i pulled it, then placed a 470uf 35v e cap in it's place, fliped it over then put the 100 ohm res across. then i fired it up and i got 1 1/2 watt dead key, 35 watt swing.
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Dwd
New member
Username: Dwd
Post Number: 2
Registered: 7-2004
| | Posted on Wednesday, July 28, 2004 - 9:25 pm: |
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Do you have a swing mod for a galaxy 55v?
DW |
Tech808
Moderator
Username: Tech808
Post Number: 3129
Registered: 8-2002
| | Posted on Wednesday, July 28, 2004 - 10:23 pm: |
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DWD,
With the radio facing you un-solder & remove the Right leg of R238 from the board.
Add a 1N4001 Diode in series with R238.
Make sure the Banded end of the 1N4001 Diode is facing DOWN and insert it into the open hole where you removed the RIGHT leg of R238.
Re-solder and you now have the SUPER SWING MOD!
Hope this helps.
Lon
Tech808 |
Dwd
New member
Username: Dwd
Post Number: 3
Registered: 7-2004
| | Posted on Friday, July 30, 2004 - 7:20 pm: |
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Thanks Lon. Where can I get the 1n4001?
DW |
Tech808
Moderator
Username: Tech808
Post Number: 3155
Registered: 8-2002
| | Posted on Friday, July 30, 2004 - 7:51 pm: |
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Dwd,
Any radio supply store near you should have them.
If you cannot find them send me your Mailing address and I will drop a couple of them in the US mail to you.
You can generally get a pack of 5 for under 2 bucks.
Hope this helps.
Lon
Tech808
Tech808@copperelectronics.com |
Tech548
Moderator
Username: Tech548
Post Number: 184
Registered: 5-2004
| | Posted on Sunday, August 01, 2004 - 12:47 am: |
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Dwd
As a matter of fact, many guys just "replace R-238" with the diode that Lon mentioned in his above post. It will work just fine with or without the resistor in circuit.
I would like to add however, you will need to slightly enlarge the two holes just a bit because the leads of the diode are a little larger in diameter. Be very careful when doing this so as not you damage the foilside of the board.
Once installed and since this is a single final radio, set your High Power-deadkey (VR-13) to a very maximum of 8 watts and Low Power-deadkey (VR-16) to 1.5 watts deadkey. This 1.5 watts is enough to trip the relays of just about any linear you may have. With this setup, your power-swing will be tremendous.
PS: It is important that High-Power (VR-13) is set first. Then set Low-Power (VR-16.
Jeff
Tech548 |
Dwd
New member
Username: Dwd
Post Number: 6
Registered: 7-2004
| | Posted on Monday, August 16, 2004 - 8:13 pm: |
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Jeff and Lon, thanks for the info. I put in this mod with the resistor and the diode in line and it increased my swing tremendously on the low power side. With this , I am able to get another 100 watts swing out of my Texas Star 667v without overdriving it at all. This was an easy mod for even a novice like me and the end result was FANTASTIC!!
DW |
Cm3885
Advanced Member
Username: Cm3885
Post Number: 563
Registered: 12-2003
| | Posted on Tuesday, August 17, 2004 - 1:33 am: |
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IMHO its better to do the final mod and then the swing mod.. works better!
I had a 29 LTD that had the swing mod and it worked but i did the final mod and it worked great!!! |
Rangerman68
New member
Username: Rangerman68
Post Number: 2
Registered: 12-2004
| | Posted on Sunday, December 05, 2004 - 11:58 am: |
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Is that going to be the same location on a Galaxy 44v? R238?
Also will a 1N914 work? |
Tech808
Moderator
Username: Tech808
Post Number: 4225
Registered: 8-2002
| | Posted on Sunday, December 05, 2004 - 12:06 pm: |
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Rangerman68,
WELCOME TO THE COPPER FORUM!
I would suggest a 1N4001 thru 1N4005 at the most.
A pack of 5 ~ 1N4001's are generally under $1.50 at places like radio shack.
Never tried a 914 so can't say.
Hope this helps.
Lon
Tech808
CEF808
N9OSN |
Domino
New member
Username: Domino
Post Number: 1
Registered: 12-2004
| | Posted on Monday, December 20, 2004 - 1:38 pm: |
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Does anyone know the super seing mod for a Cherokee 500? Any help would sure be appreciated!
Domino |
Hdluvbugs
New member
Username: Hdluvbugs
Post Number: 1
Registered: 12-2004
| | Posted on Sunday, December 26, 2004 - 7:18 pm: |
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swing mod for a 148 cobora |
Tech808
Moderator
Username: Tech808
Post Number: 4383
Registered: 8-2002
| | Posted on Sunday, December 26, 2004 - 8:17 pm: |
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Hdluvbugs,
WELCOME TO THE COPPER FORUM! 
Remove R-238 or Add / Install a 1N4001 Diode in its place or in series with the banded end of the 1N4001 to the right leg towards the regulator.
Hope this help's,
Lon
Tech808
CEF808
N9OSN
PS, When you get the Chance check out the Topic in the OPEN Area titled:
CEF RADIO CLUB WANT TO JOIN 
If you decide to join our CEF Radio Club just send me your information and I will be happy to add you to the CEF Radio Club Membership Roster.
|
Hdluvbugs
New member
Username: Hdluvbugs
Post Number: 4
Registered: 12-2004
| | Posted on Friday, December 31, 2004 - 11:00 pm: |
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Tech 808 my 148 was worked on 5 yrs ago. i have been looking to see what was done i found r129 cliped. everyones says r131 is th eone to clip???? |
Jon666
Intermediate Member
Username: Jon666
Post Number: 322
Registered: 11-2003
| | Posted on Wednesday, January 05, 2005 - 8:16 pm: |
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i wouldent clip anything
it will just sound overmodulted |
Theozz
Junior Member
Username: Theozz
Post Number: 14
Registered: 7-2004
| | Posted on Monday, January 10, 2005 - 3:55 am: |
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does anyone of a swing mode for the old rci 2950 with the orange back lights |
Inspector
Intermediate Member
Username: Inspector
Post Number: 117
Registered: 12-2001
| | Posted on Wednesday, January 12, 2005 - 12:55 am: |
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Here is the propper way to do the heavy swing mod to the older RCI-2950: First do NOT clip the modulation limmiter as that will defeat the purpose of the mod. Adjust the modulation to no more than 100% by adjusting VR14. Next solder one end of a 100 ohm resistor to one end of a 1N4001 silicon diode (in series). You may bend the parts into a "hairpin" shape to aid in installation. Find resistor R285 or capacitor C300 and note that they share the same solder points on the bottom of the board...You will add the diode-resistor combo to those same solder points, paralleling the existing parts. When you solder the combo into place, the banded-end of the diode should be installed going to the solder point closest to the rear of the board. Now key the radio and set the dead-key-low setting to about 2W by adjusting VR15. When you modulate it should swing nicely but not "hog-wild". With the limmiter intact, you should never have an overmodulation or interference problem with this mod yet you will sound loud as hell and drive an amp nicely... |
Supertech1
New member
Username: Supertech1
Post Number: 4
Registered: 1-2005
| | Posted on Tuesday, January 18, 2005 - 1:24 am: |
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You guys and your 'simple' mods.--They all sound so 'muddy'!! I have been doing super swing kits on am radios for years. I can adjust my radio down to 0 watts and swing like ssb but it's better to set it at .2 watts or whatever is needed to just key the amp and modulate to 30 watts plus. Leave the limiter intact and adjust dead key without effecting max power and pep swing to twelve watts while rms does not swing above 5 watts. I designed and employ a transistor based, modulation controlled carrier controller between the driver and final amp. A 20 turn pot regulates and controls the dc supply to the DRIVER for deadkey and modulation drives the transister to full power to the DRIVER transistor(it's only a couple of amps)FINAL transistor supply is not altered and you can swing like a monkey and sound cleaner than stock. I have driven a 2 pill(2sc2879) output at 10 watt deadkey and swing to 500 watts(awesome!) Bottom line is....swing just the DRIVER not the FINAL using a secondary power control stage! The whole mod is a total of 5 parts including the variable pot.
Listen for operator 525(polarbear) alas 25 on the west coast--southern California desert and tell him supertech says "hi".
73's
supertech |
Bigbilly
New member
Username: Bigbilly
Post Number: 9
Registered: 2-2005
| | Posted on Saturday, February 26, 2005 - 1:13 am: |
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"Supertech1", a transistor based MODULATION controlled carrier controller? What? An A.M. radio with the carrier cut back does NOT swing like SSB!! It's double side band because you are still using both sidebands! A potentiometer controlling the DC voltage to the driver is changing the bias of that transistor, therefore changing its operating class. To effectively regulate the voltage you would have to add capacitors in that circuit. If you have an output of 10 watts and swing 500 you do not sound awesome. You sound muffled. That is about the best case for over modulation I've heard of.
But, you know that being a supertech.
bigbilly
ke5bbc
-.- . ..... -... -... -.-. |
Kid_vicious
Intermediate Member
Username: Kid_vicious
Post Number: 235
Registered: 9-2004
| | Posted on Saturday, February 26, 2005 - 8:22 pm: |
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bigbilly, do you live in NV? |
Patzerozero
Advanced Member
Username: Patzerozero
Post Number: 509
Registered: 7-2004
| | Posted on Saturday, February 26, 2005 - 11:10 pm: |
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no, but 150 watts of dead key & 500 watts of swing sounds alright. a non-super swing modded radio may key that same amp at 250 & swing to 300. more stress & heat from the 250 dead key, though YES more 'off the line power'. the extra 200 watts of swing does make a difference. i don't need to hear again about overmodulation, overdrive, flat topping, theory of relativity & the laws of physics. this is not WNBC radio. we are not following the rules to a T to get the absolutely most pleasant sounding to the ear signal possible. yes, garbled, muffled, overmodulated junk is rough on the ears & enough to make you want to shut the radio off. your signal has to SOUND decent, i don't care what it looks like on the scope, we're trying to get through dozens of other stations fighting not to log a contact, but to be heard & be called. sick isn't it? but that's the reality of it.
i know what is supposed to happen. & how & why you are supposed to do it that way. the laws of physics also say a pitcher CANNOT make a curve ball curve a given way at a given point, 60'6" every time. but there's guys making millions doing it every day. the guys on channel 6 are not doing a cut & snip & checking it on a $49 wattmeter. they are using equipment every bit as sophisticated as any broadcast station to get what they are getting. they prove that 1kw dead keys can swing 4kw pep & that swing on AM is effective. oh yea, and they're using that 1kw with 4 kw swing to drive 10kw & swing 40kw. and that 3kw or 30kw or even 300 watts of swing is useful in getting your signal out. no matter what the laws of physics or theories of electricity say. it's done every day. and proven.could they put those talents to better use? probably. they've all been told you ain't getting 200 watts out of a transistor rated at 120 pep. RATED. toshiba figures at that pep it should be durable & warranty costs will be low. stuff more voltage & input wattage in it & you'll get more then 120 out. sure, eventually it blows up, just back off a bit. the engine in my truck is rated at 230HP. RATED. for warranty reasons. a little tweak & tune of the input & output circuitry & it's up to over 300 dyno tested HP. all those exhaust systems & air intake systems & fuel flow systems & computer reprograms are doing the same thing as the amp builders & techs are doing to radios. just as some mechanics can't build a good running race engine, some techs can't build a good running 'race' radio. same difference though. |
Patzerozero
Advanced Member
Username: Patzerozero
Post Number: 511
Registered: 7-2004
| | Posted on Sunday, February 27, 2005 - 12:32 am: |
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YES! bolt it on to chassis right behind the 2 1969's! that's what they are doing with the S9's that are getting REAL 65+ watts out of! have also seen dual final radios with holes drilled in cover over back of radio & cooling fans bolted on to pull out heat. |
Racer_x
Member
Username: Racer_x
Post Number: 51
Registered: 2-2005
| | Posted on Sunday, February 27, 2005 - 5:04 am: |
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Patzerozero - The engineers of WNBC would kick butt on channel 6 if they participated because they understand AM. Using the miltiband compression processing they keep the modulation so close to 100% all of the time that it would only be a question of power for them. And I imagine they could whip up whatever they needed.
Yes, AM has a 4:1 PEP to carrier ratio, but you aren't going to see that on a cheap meter using voice to modulate the carrier. You'd have to use a good (expensive) powered PEP meter and a constant tone or tones so it stayed at 100% long enough for the meter movement to catch up. An oscilloscope would be better, and the waveform would show instantaneous results.
Cutting limiters is a cheap and VERY dirty way to get more modulation. Using a speech processor is cleaner and actually works better because there is no information lost as additional sidebands on other freqeuncies. You can also taylor the level of processing to your liking. From none (exceptional clarity and widest possible dynamic range) to heavy (poundingly loud signal) and anywhere in between.
Dude - what are you saying about curveballs? They have machines that can throw curveballs repeatedly. Go to a batting cage. I think you need to get a newer physics textbook.
Toshiba rates their transistors at 120 watts for a reason. It could be reliability but I've heard that they start getting dirty at 80 watts of output, and over 120 watts it gets really bad. Don't ask me for a source because it's a rumor I read on a newsgroup nearly a decade ago. Sorta makes sense though. Every HF rig I know of that uses 2879s uses them in pairs for only 100 watts total output. Excessive reliability, clean signal or both? Does it matter? No. Using anything beyond it's designed or recommended parameters doesn't prove anything.
Electronic devices aren't engines and the analogy isn't applicable. |
Jon666
Intermediate Member
Username: Jon666
Post Number: 333
Registered: 11-2003
| | Posted on Sunday, February 27, 2005 - 6:27 pm: |
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im going to overclock
my toaster any help
thanks
jon |
Patzerozero
Advanced Member
Username: Patzerozero
Post Number: 512
Registered: 7-2004
| | Posted on Sunday, February 27, 2005 - 6:47 pm: |
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take a box stock uniden grant xl. add the best speech processor you can to it. take a dx 667v, 1-2sc2290 x 4-2sc2879's run on a clean, regulated 13.8 volt power source with sufficient current available on ALL peaks. take another grant xl with npc-rc, volted final, swing mods and a davemade m400, 1x4 amp. same power source. yes, cleanliness with the 1st choice will be as well as can be expected for cb use, & the 2nd will pale in comparison, & maybe you are losing talk power to harmonics & signal going everywhere you might not be intending it to go. however, the 2nd set up will obliterate the signal of the 1st set up. every time. guaranteed. on dx, the same results will happen MOST of the time. you MAY see from the amp 150 watts/450 watts the 1st setup & 250watts/1000watts the 2nd setup. & the scope shows avg voice peaks never breaking 100% the 1st setup & being a bit higher on the 2nd. again this is not earl's clip 'n' snip, it's being set up to be intelligable & able to outtalk the 1st setup.
nobody ever said the 2879's are staying clean over 100 watts. what was being said is the 2879's CAN & DO produce considerably more then 100 watts.
oh, wait, we're still on 13.8 volts. crank the amp up on 18 or 20 or 22 volts. nobody is guaranteeing reliability equal to toshiba's intended point. but again, what is being said is that 120 watt rated transistor will produce CONSIDERABLY more & if you keep the heat down it will last a while. the fan is powerful enough to suck a napkin across the floor & at 13.8 volts non stop ragchewing for an hour & you have to double check the wattmeter to make sure it's still working because the box is so cool. look at some of the REAL shops that do the amp & radio setups. earls clip'n' snip couldn't afford 1 element for the bird meter these guys use for 'road calls'. they see what's happening on the
scope. overmodulation is no good, clipped limiter is not a guarantee of overmodulation. adjust the VR & change another resistor in that circuit-or snip the limiter & back down the gain to keep it under 100%. & you can still add compression.
comparing electronic devices to engines is applicable in that the subject IS able to produce more output then the manufacturer is willing to warranty their subject for. that was what that was about.
the whole point is not regarding cleanliness of signal. it is about the ability of a given device being able to produce enough output to overcome the competition of a similar device occupying the same airspace. nor are we talking about the legality of doing so as your post regarding your preference of the use of HF rigs on 11m leads to the assumption that you are doing so. and that is not held against you in any way shape or form. should you desire to mod that company's matching HF amp to 11m for use at your station, that choice too is accepted. and if you were to step down to an AMers level & key up with that station & key over whoever you intended to key over-more power to you. & when i invade SSB territory, it is done not to have the best SSB signal out there, but to be able to communicate with whoever i wish to communicate with. should they tell me some part of my signal is too much, i'll make every attempt to adjust to where they tell me' now you sound great' & hopefully remember to reset it there next time i visit SSB-land.
i admit what's being done isn't producing the cleanest signal possible, but what's being done has been proven to work in the world of cb radio, & comparing it to what the professional broadcast world does is too, not applicable(legality aside).
i can't find it, actually don't even know where to begin looking, but there was a very LARGE thesis written within the last 5 years or so that basically stated that there is no way to make a baseball curve the same way, the same amount, in the same spot every single time. & the amount of times they do throw it as they want is more by chance then anything else. twist of arm at release, velocity, location of arm & 99 other reasons were given as to why it can't happen. the same website also had a debate regarding a classic picture of a locomotives drive wheel spinning & the picture showed spokes visible clearly & unblurred at point A & at point B they were completely blurred from movement & the arguments were was the wheel moving at the same speed at every point on the wheel. there were pages & pages explaining why the wheel was moving at the same speed all the way around it's outside edge & more pages explaining how & why it was moving at different speeds at different areas along its outside edge, hence the picture showing the wheel at full speed at 1 point & stopped at another. kinda like the ant can never reach the hole because mathematically it can always cut the distance to the hole in half-6" away, 3" away, 1.5" away, .75" away-it can NEVER get there. but we all know it does.
phew |
Racer_x
Member
Username: Racer_x
Post Number: 61
Registered: 2-2005
| | Posted on Monday, February 28, 2005 - 11:34 am: |
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Patzerozero - Sorry man, I couldn't read your last post the whole way through because I've grown tired of this discussion. You're apparently a believer and any logical argument won't make you change your mind because you've made an emotional decision to believe in this stuff. That's cool - enjoy. |
Jon666
Intermediate Member
Username: Jon666
Post Number: 334
Registered: 11-2003
| | Posted on Monday, February 28, 2005 - 8:18 pm: |
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i overclocked my toaster
now it throws my toast 20 feet
burnt flying toast
jon |
Dave123
New member
Username: Dave123
Post Number: 4
Registered: 1-2005
| | Posted on Monday, February 28, 2005 - 10:16 pm: |
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Just IMO, talking about transistors. Take a look at the gain curve and note that at a point it jumps up, then flat-tops. The xsistor is designed to run at a certian wattage dissipation. Wattage = heat. The farther you are to the right on the gain curve, the more curent, heat and therefore distortion. Distortion is the junction of the transistor heating up, you can see that on the scope. At far as "overclocking" a xsistor, you can do that IF you have perfect cooling but you still cant overheat the junction either or your out of luck. I always use care not to overdo it .. hot day hot radio poof. Hope this helps. 73 Dave |
Therealporkchop
Intermediate Member
Username: Therealporkchop
Post Number: 168
Registered: 11-2002
| | Posted on Tuesday, March 01, 2005 - 12:30 am: |
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First off...You can use the 1N914 in place of a 1N4001. The results are the same, atleast they are on my scope and meters.
Next up...Anyone have any info on the older 2970 please send me an email and help me out.
Oh yeah, I've got to see that 65+ watt S9. Cause all I've heard is how I couldn't get 40 watts PEP outta my Galaxy 77 with twin 2312's. So I don't see that much happening outta twin 1969's. And if you can, why does Galaxy use a 2290 in the 93T instead of just using two 1969's.
Pat & BC...I'm counting on you guys. I know you're gonna give me one. I want you two to send me some pics of this super radio. And I am going to get one and if it's as good as you say, I'm going to throw my Galaxy radios in the pond outside... |
Mrbigshot
Junior Member
Username: Mrbigshot
Post Number: 32
Registered: 2-2005
| | Posted on Tuesday, March 01, 2005 - 11:52 am: |
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what info you need? (2970 NON DX) ill look around
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Troublemaker
Member
Username: Troublemaker
Post Number: 98
Registered: 2-2004
| | Posted on Tuesday, March 01, 2005 - 7:37 pm: |
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Jon, thats a "HOT" mod!!!hehehe |
Therealporkchop
Intermediate Member
Username: Therealporkchop
Post Number: 173
Registered: 11-2002
| | Posted on Wednesday, March 02, 2005 - 12:21 am: |
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I'm gonna mod my hello kitty toaster in the morning too.
It's a DX model with the amp built onto the bottom. I want to know what resistor is the audio limiter like R249 is in the Galaxy radios.
Oh yeah, anyone ever seen a barefoot General Lee swing 100 watts RMS or PEP? I didn't think so. |
Jon666
Intermediate Member
Username: Jon666
Post Number: 336
Registered: 11-2003
| | Posted on Wednesday, March 02, 2005 - 7:41 pm: |
|
cool beans
a stock general lee
i highly dought it
jon |
Patzerozero
Advanced Member
Username: Patzerozero
Post Number: 522
Registered: 7-2004
| | Posted on Thursday, March 03, 2005 - 8:23 pm: |
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all depends on your ultimate goal, porkchop. i asked about why the lincoln w/it's 477 or whatever is only doing 25 watts. good, i now see them doing 50+. that's a start. why is the 93t w/an 80 watt transistor doing 50 watts? ok i see them doing 80+ now. still wouldn't buy 1, but they're getting there now, too. the 2290 sounds more impressive then saying 1969, & it SHOULD outperform 2-1969's. export jacksons with their inferior receivers were supposed to outsell the export grants for the transistor reason, but the dual final grants were still outperforming the 477 jacksons & had a better rcvr to boot. somewhere, maybe not even on this thread because i don't have time to re-read, i believe it was you who asked how are the 2 1969's going to outperform the 2290. the compressor. forget about the modulator at this point, if that's everybody's sticking point.
even before physically getting more watts out of the 2 1969's the compressor is giving them more talkpower then the 1-2290. in stock form. get it up to it's rated 80 watts AND then add quality speech compression & it then should outperform the S9, but i don't know if anybody on the forum professed to getting 1 of lou franklins DSP units to work at all much less properly. i've got several laying around in parts radios, i'll have to take 1 out & try to put it in something i have laying around.
and yes, when i got my S9 it had the hype of being something unbelievable, & after we put it up against my grant xl on a couple different amps all of the hype disappeared. MAYBE it barely out performed my XL, with an amp. without, it had a slight edge, though not up to the hype. MINE now is doing over 40 watts pep on a brand new palstar wm150m, which replaced my smoked diamond sx100. this meter in line with a bird 43 showed watt for watt EXACTLY the same carrier wattages & same rms swings after being calibrated to the bird. even before it was AWEFULLY close on dead keys, & within <5% on rms swings. in pep it & the bird are still within 5% under 500 watt peaks on steady tones, & it seems to be pretty close to the bird on peaks during normal speech pep.
on the open forum i stated i'd probably purchase the alleged new magnum S12 with a dual 2290 amp section built in. as long as it's along the ar3500/rci2970 style as opposed to the magnum 357/457 style, then yes. that would be to power my 8 pill amp without having to use a separate driver amp, for everyday use-no, i wouldn't use it. 4 watt radios are easier to set up with 5 pill & smaller amps. the S9 IS a major hassle with my davemade 5 pill, even with the dx500v,output should be better. a grant xl & dx667v is an easier setup & gets everybit the same output.
the 93 & 95 galaxy's have their place, it's just a good portion of the folks that buy them don't realize that their small amp will not work with them & they are not prepared to go to such a larger amp & it's other neccessary upgrades.
the S9 will not be equal powerwise to the 95t, but the 93t is a different story. S9 all the way.
S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9.
and even if it was close, S9 receiver seals the deal. |
Unit702
New member
Username: Unit702
Post Number: 1
Registered: 4-2005
| | Posted on Saturday, April 30, 2005 - 5:25 am: |
|
Hi!
Can someone tell me How to add super swing to
my Cobra 140 GTL and superstar 3900?
I would be most thankful.
73's |
Superbazooka
Junior Member
Username: Superbazooka
Post Number: 13
Registered: 1-2002
| | Posted on Monday, July 04, 2005 - 9:12 am: |
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Hi, I have a president grant mobile -dual finals and I was wandering if there is a mod I can do to get a low key and keep my high swing? Now it keys 5 watts and swings 35 watts. I want to keep my swing but drop the key to around 1 watt. CAN ANYONE HELP? thanks bump bump! |
Sg569
Intermediate Member
Username: Sg569
Post Number: 166
Registered: 12-2004
| | Posted on Monday, July 04, 2005 - 1:46 pm: |
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Pat00,
What speech processor would you recogmend for a grant xl, and would it work w/ the npc/rc mod?
I'm already loud and clean( atleast all the locals tell me so), but I want to be super clean and loud.
Thanks sg569
|
Therealporkchop
Intermediate Member
Username: Therealporkchop
Post Number: 229
Registered: 11-2002
| | Posted on Monday, July 04, 2005 - 5:37 pm: |
|
Pat, so what you are saying is if I want the bragging rights of power, I need the 95T. But if I want to hear all I can hear, go with the S9?
I really love the way the S9 looks. But I don't want to buy a radio that one of my Galaxy radios already out talks. I just sold the 48T today to help fund the S9 project. I got rid of my 93T a long time ago. My 77 will swing 40+ watts PEP already, so will the S9 out do that? Is there a swing mod or any other mods for the S9?
Come on Pat, sell me on this radio!! |
Patzerozero
Senior Member
Username: Patzerozero
Post Number: 1004
Registered: 7-2004
| | Posted on Tuesday, July 05, 2005 - 12:08 am: |
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superbazooka-i just spent 1/2 hour looking thru junk for mods & schematic for pc999chassis/president grant export & couldn't find it. but yes, as with all the dual 1969 final radios, it can be set with a variable 1-10 watt key & 40+ watts swing.
Sg569, the only speech processor i've used is the 1 by lou franklin. i've never managed to get 1 to work on my heavily modded grant xl. ANY gain & it gets horrendous scratch & crunch. back the gain down to nothing & all you get is very low scratch & crunch. i think there is just TOO much gain with npc-rc, volted final & switched limiter. i have gotten it to work fine with a stock 148, & you can tell something is forcing it to be louder. HOWEVER, my XL walks all over that 148 like it's not even there. whether audio quality is better on the processed 148 is debatable as well as i've been told the XL SOUNDS BETTER as well as being considerably LOUDER. mind you NO test equipt was used, it was all done to the ear of the receiving stations, so i have no idea when & where it reached 100% modulation. i KNOW what my XL sounds like & the unsolicited reports i get so if yours is modded like mine & the audio is anywhere near the same, & you're happy with what others tell you, i don't think it's worth trying to make the speech processor work on a modded radio. now, read my reply to porkchop, & try some other mics...
i value not getting a headache from the SHHHHHHHHH of white noise & not having to strain my ears to hear things that don't even exist on some rci & galaxys i've listened to.(read thru postings from a few of the other guys, mikefromms to name 1, several were surprised at JUST HOW MUCH BETTER the S9's receive was over a galaxy they replaced!) i mean if the S9's xmit STUNK, i wouldn't buy it, but i feel it's xmit & rcv more then justifies the price. if you just wanna HEAR the other truckers NEAR you, & need 150 watts to get over the mudducks in between you, then sure, the 95t is probably an excellent choice. keep in mind the ONLY amplifier upgrade to the 95t is an 8 pill amp, or somewhere around 1kw, give or take. sure you can get less watts by lowering the dead key and/or mic gain on the 95t, but you have a considerably bigger price outlay & more expensive wiring/setup & the worry if your alternator or computer is gonna give you trouble, etc. with the S9, you CAN get certain 5 pill as well as 4 pill amps to work satifactorily with it(less $$ & less equipt upgrades & less chance of trouble). so you have a little more elbow room when it comes to getting watts out.
$320(S9) + $300(dx500) = $620 for 150 watts key & around 500 swing
$400(95t) gets you 40 watts key & 150 swing, then add $650(dx1600) & you're up to $1050 for 350 watts key & 1000 swing, plus whatever possible problems may arise.
you have to decide how you plan on using it(dumptruck only, swapped between mobiles, base etc)& what if any upgrades you MAY decide on in the future. if you don't plan ahead, you may be forced to purchase another radio. so as much as i feel the S9 is the BETTER radio over the 95t, the galaxy MAY just be the better radio for a different user.
as for the 77, the compressor portion of the topgun circuit in the S9 should make the S9's equal 40 watts seem like more. EVEN if someone were to say the 77 SOUNDS louder, key it down with the S9 & you'll see the S9 get past the galaxy.
i wasn't totally thrilled with the output of my S9 when i got it. sure, it competed with my 150 watt ar3500, audiowise, but my grant xl seemed to be awful close if not better then the S9 keyed up against each other. too close for a radio with double the wattage & a compressor...opening it up did no good as NOTHING is labeled. after tracing out the schematics we identified a couple adjustments (which are now posted on the tools sidebar under modifications)& got the radios output to an honest 40+ pep & 12 watts AM carrier. ALL AUDIO MODS WERE DONE BY EAR NOT SCOPE & I GET NO COMPLAINTS OF UNINTELLIGIBLE OR MUFFLED AUDIO so please don't start, guys! .we found that vr503 LIMITS the mic gain & you could turn it up all the way & then use the front panel mic gain to adjust DOWN for clarity. vr14 was tweaked -BY EAR-for most swing before clarity of audio was impeded.vr16 & 13 had to be alternated back & forth til front variable knob showed 1 watt key on low & a tad over 12 watts key on high.(high went up past 16, but low wouldn't go under 5 & swing was dropped, so 12 watts was a good place to stop)adjsuting vr12 got SSB output up to 40+ swing, where out of the box it was only about 25. since i DON'T use an amp in the base,(except for testing) i keep the S9 FULL POWER (not key 1 swing 40, but KEY ALL 12 & swing 40)& it makes a difference. after i was satisfied with all the tweaks, i've tried a dm452, d104, turner +3, +3m handheld, +2, d104m, road devil & shure 526t. the +3 handheld is the BEST handheld on the S9. the tone of my voice is different with the +2 & 526t, but those 2 have gotten the best reports. crystal clear readability & LOUD like nothing else! even louder then my XL i've been told. have not had the opportunity to do a side by side with ar3500 or xl, but within 45 miles, the S9 both AM & SSB is NOW AN AWESOME PERFORMER.
just remember ANYBODY can take a $40 midland 77-104xl & put a couple 4cx15000 tubes after it & obliterate your 40 or 150 watts with 25kw. it'll be louder & outtalk both the S9 & 95t. all you can do with the S9 & 95t is compare features & tweakability & see which is best for YOUR needs. neither is better. EXCEPT FOR ME THE S9 IS BEST
I WILL NOT EVEN CONSIDER A GALAXY FOR MY USES!!!
good luck, therealporkchop! |
Sg569
Intermediate Member
Username: Sg569
Post Number: 170
Registered: 12-2004
| | Posted on Wednesday, July 06, 2005 - 12:20 pm: |
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Pat00,
Speaking of mics, What is your thoughts on the Diesel 4-4 noise cancelling mic. I picked one up for a buck so I ain't out much.
Just wondering, I plan on trying it out N-E-ways. just wondering about the quality of them.
Thanks sg569 |
Therealporkchop
Intermediate Member
Username: Therealporkchop
Post Number: 236
Registered: 11-2002
| | Posted on Wednesday, July 06, 2005 - 10:27 pm: |
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Well......it won't be long now. Soon all my post will be something like this....
Question: "What's the best mod for a Galaxy?"
Answer (from me): S9S9S9S9S9S9S9S9S9S9S9S9S9S9
HAHAHAHA......I love you guys...... |
Rob5mike
Intermediate Member
Username: Rob5mike
Post Number: 164
Registered: 7-2002
| | Posted on Friday, July 08, 2005 - 11:42 am: |
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Sg569...the Diesel 4-4 noise cancelling mic is an ok mic but its not a real good one.If you want a good noise cancelling mic go with the Road King RK56 or the Astatic 636L.I used the Diesel mic for about a year and then bought the RK56 and it was night and day between the two.
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Sg569
Intermediate Member
Username: Sg569
Post Number: 172
Registered: 12-2004
| | Posted on Friday, July 08, 2005 - 10:58 pm: |
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Thanks Rob,
That's the mike I want to try on my mobile, just to see if is talks any better than my pwr mic.
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Patzerozero
Senior Member
Username: Patzerozero
Post Number: 1012
Registered: 7-2004
| | Posted on Saturday, July 09, 2005 - 9:14 am: |
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the original turner road king rk76-an amplified/noise cancelling mic was the handheld i liked best. the astatic road devil is the closest i've found now & it works pretty good. i VERY RARELY use any power mic, however... |
Tinboy269
New member
Username: Tinboy269
Post Number: 1
Registered: 5-2005
| | Posted on Saturday, July 23, 2005 - 1:12 am: |
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does anyone know if the swing mod will work on my general stonewall jackson if not are there any mods for it.... |
Timberwolf455
Junior Member
Username: Timberwolf455
Post Number: 23
Registered: 10-2006
| | Posted on Saturday, April 17, 2010 - 1:26 pm: |
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well the 1n4004 works great,didnt have one of the 4001s,i just tried it on a galaxy 88,i had to scream into the mic before and now it swings like it should without having to eat the mic,thanks for the info 808 |
Ronnster
New member
Username: Ronnster
Post Number: 2
Registered: 5-2011
| | Posted on Sunday, June 19, 2011 - 3:37 pm: |
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dose anyone know anything about a N.P.C.
Mod for a Older RCI 2950 |
Andy
New member
Username: Andy
Post Number: 1
Registered: 1-2012
| | Posted on Wednesday, January 18, 2012 - 2:41 am: |
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Romeo Foxtrot X-Ray DX Group Radio Mods this website gives the best cobra 29 swing mod i have seen gives you variable power down to 1 watt and 5 watt dead key with no swing loss u change caps a few resistors the 2078 final to 1969 and u add a tip 120 for your variable power good clean audio and swings very good Variable Power for Cobra 25 & 29LTD
Cobra 25 LTD
Find and remove C70 & JP6(near Final).
Disconnect Orange and Brown wires from the RF Gain Control,then connect these wires together.
Install Q1(see diagram) where JP6 was.The right leg(emitter) of Q1 in the hole near the final.The Centre leg(collector) in the other hole.
Solder a wire from the left leg(base) of Q1 to the centre tag of the RF Gain Control.
Remove VR5(near transformer)
Connect the last tag of the RF Gain Control to a 100ohm resistor and solder to L6 pot.
Solder a wire from the upper tag of the RF Gain Control to the top connection of VR5(already removed)
Cut D9 out of the circuit (this is the Clipping Diode)
Put plenty of heat sink compound onto the tab of Q1, then using the proper mounting hardware mount to heat sink (make sure that the tab of Q1 is insulated from the heat sink)
Cobra 29LTD
Follow instructions for Cobra 25LTD, except remove C73 & JP36 instead of C70 & JP6,remove VR4 instead of VR5, Also cut D11 instead of D9.
Q1 = TIP120 (Radio Shack), capacitor = 22 uF 25 V |
