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Message |
    
Joesph12
New member
Username: Joesph12
Post Number: 3
Registered: 5-2014
| | Posted on Friday, May 30, 2014 - 12:45 pm: | 
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I have above base station and forever it seems cant find two mods.
Anyone know how to do a variable power mod the location on board to tep into or remove that part and what k pot do I need?
Swing mod same asking as above what I need location remove a part tap into ect....???
Any help greatful Ive had no research luck for over a year and I do know these mods can be done Ive seen the radios with them but mine is bare needs some bump. |
Possum_lodge
Junior Member
Username: Possum_lodge
Post Number: 23
Registered: 5-2014
| | Posted on Saturday, May 31, 2014 - 7:03 pm: |
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Your post is vague - so I don't understand what you are trying to ask about.
If I had that radio, I would leave it stock.
If you want more power, why not just buy a ham radio and convert it for 11 meters..
That way you could control your transmit audio and your output power - the whole way to 100 watts SSB and 25 watts AM, which would be enough power to run a low drive amplifier... |
Press_man
Advanced Member
Username: Press_man
Post Number: 773
Registered: 5-2008
| | Posted on Monday, June 02, 2014 - 6:14 pm: |
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Howdy Joesph12 and welcome to Copper, you too Possum_lodge.
Huh; swing mod on that radio isn't a real good idea. A lot of radios with swing mods just don't sound good and looking at them on a scope, they exceed 4:1 audio output which can cause pinching and removing the clipper can cause flat topping. Neither is a good thing.
The 1000 is pretty much a 29 GTL. Changing the final to a 2sc1969 will give better swing without adding distortion. Copper has them, ask them to test it for you before shipping.
The variable wattage control on an AM only radio requires building a small circuit and isn't really worth the time.
I'd replace ALL the electrolytic capacitors. Like so many older rigs, there are likely some weak caps and some of them in the 10 volt range. Use the same values but with 25-50 volt range. Buy good ones, remember, cheap is cheap.
Tune the radio and set carrier for 2-3 watts then get a small amp like a KL203P and a power supply large enough for the amp, Copper can help with both. Be sure to run a TVI filter.
73 Pressman
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Dale
Senior Member
Username: Dale
Post Number: 2092
Registered: 12-2002
| | Posted on Monday, June 02, 2014 - 7:25 pm: |
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i agree. those 'swing' mods usually arent worth
it. if ya want REAL swing get yourself a texas star
mod v right here from copper.you,ll have about
100 watts of swing. plus they make awsome drivers
for much bigger amps. id turn down dk to 1-2 watts
and bump up audio a tad and call it a day thats it
dale/a.k.a.hotrod
cef426
cvc#64
454 [dx numbers]
38lsb
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Joesph12
New member
Username: Joesph12
Post Number: 4
Registered: 5-2014
| | Posted on Monday, June 02, 2014 - 9:18 pm: |
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Im wanting to hook a pot up and have the control outside.This way I can run my kicker.I could just ajust my dead key inside however when not running kicker Id have bare one so watts.Right now after ajusting radio inside the best I can get it is three and half dead key swing ten on a D104 amplified desk mic.Which than brings me to how to do a swing mod.The variable power mod I cant find info on-what k pot is best -locations on board to do all-and what to add or remove inside-resistors capassitors-what to step up in voltage uf or what be.Same to the swing mod as well. |
Joesph12
New member
Username: Joesph12
Post Number: 5
Registered: 5-2014
| | Posted on Tuesday, June 03, 2014 - 12:37 pm: |
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Thanks guys for input.Truthfully as to the final I myself never have upgraded one in a radio.Than theres inputs that its not worth time based on small out come gained.Some say alot better with upgraded final.So on that note first hand I dont know.
The final mentioned in prior post will it solder leg for leg same as stock one in Cobra 1000? Or is the legs have to go in differnt spots.
I may take a new final approch however with the 1969 is there any thing I have to step up inside-Diodes resistor capacitor? Or just put final in.
Ive put thought in replaceing all caps any input on good capacitors as in makers of them name brands? |
Possum_lodge
Junior Member
Username: Possum_lodge
Post Number: 25
Registered: 5-2014
| | Posted on Tuesday, June 03, 2014 - 4:51 pm: |
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The problem you are going to have Joseph is that when you go to buy discreet components - sometimes the shipping and handling charge will be as much as the components themselves with a $30 minimum order, it can get very pricey to upgrade a cheap radio...
I saw Cobra 1000's at a hamfest Sunday for as cheap as $100.00
Everyone was trying to unload their old CB radio stuff.
Until someone can explain POWER to you in terms that you can understand, you will be caught up in this power frenzy where someone is trying to squeeze as much power out of a radio as possible.
How QRP Works -
1000 WATTS vs 1 WATT: UNDERSTANDING THE DIFFERENCE
1. An "S-unit" on a receiver's S-meter or in the R-S-T system consists of a 6-decibel increase or decrease of output power received from a transmitter.
2. Power needs to be increased four times or 400% to result in a true 1 S-unit or 6db RST gain.
3. Reducing output power down to 25% of previous power should result in an S-Meter or RST drop of only one 6-db unit.
4. A 10-decibel increase in signal strength requires a power increase of ten times!
Next, there are three practical facts to remember:
1. The R-S-T system was designed originally for the human ear and was based on typical receiver performance of over 50 years ago.
2. Modern receiver design permits signals which are technically "weak" in measured decibels to sound quite good (ie: 569-579) to the ear.
3. The human ear is sensitive enough to appreciate a 1 or 2 db change in signal strength, which is why moderate changes in output power often result in more dramatic signal report changes. (In fact, the value of a decibel was determined to be that increment of sound change which the ear could detect!)
The following example shows RST reports to be expected, in exact theory, at various power reduction levels. We will start with the classic 1000 watt station which gets a report of "10 db. over S-9" measured on the receiving station's S-meter.
Assume identical dipole antennas at both stations. Our chart does not start at the proverbial "30 db. over S-9" and work itself down to S-1 for reasons that will become obvious.
S9+10 db. 1000 watts output
S9 100 watts output
S8 25 watts output
S7 6.25 watts output
S6 1.56 watts output
S5 .39 watts output
We can see that it becomes easy to play games with such numbers. For example, an RST of 439 is a legitimate report which permits reasonably effective communication. But, do we believe that the transmitting station illustrated above could really produce a 439 signal by running .0013 watt? If we say "probably not", we also ask why not, and then we would get the seminars about perfect antenna matching, transmission line losses, and so forth.
Under good propagation conditions, SSB signal reports of "20 over S-9" and more can be given without even needing 1000 watts or a beam antenna. Assuming the "+20" is an accurate report, consider this example of power reduction over the same path:
S9+20db. 1000 watts
S9+10db. 100 watts
S9 10 watts
S8 2.5 watts
S7 .625 watts
S6 .156 watt
S5 .039 watt
S4 .0087 watt!
"S9+20" is what amplifier users expect to give and receive to justify their investment and power consumption. Most commercial transceivers have typical output in the 60-200 watt range, and S8-9 reports are taken for granted.
Actually, 15-25 watts is a far more practical operating power than most amateurs and equipment vendors realize today...and the thousands of QRP enthusiasts will confirm that getting a solid 579 running 3-4 watts is no big deal.
If all the above theoretical signal reports are based on both the transmitting and receiving stations using simple dipole antennas, we can also see that the use of some 10db gain antenna such as a beam or quad by either station could move the S7 for .625 watt up to S8, and that a similar antenna used at the other station could give the under 1 watt signal a further boost over S9! |
Tech237
Moderator
Username: Tech237
Post Number: 1793
Registered: 4-2004
| | Posted on Thursday, June 05, 2014 - 1:44 pm: |
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What can I say - 5w out into an almost ground mounted A-99 produced 80 CONFIRMED countries, and 49 CONFIRMED States (darned Idaho)in 3 months, on 10m..
Power is not everything, and in fact can make communication harder rather than easier. Leave the radio as stock, tweak and set up the best antenna you can - remember it's gain works on both TX and RX..
Tech237
N7AUS
God made me an athiest, who are you to question his wisdom?
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Possum_lodge
Junior Member
Username: Possum_lodge
Post Number: 27
Registered: 5-2014
| | Posted on Friday, June 06, 2014 - 8:08 am: |
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When 10 meters is open, it does not take a lot of effort to talk long distances, even with a marginal antenna.
I agree with you 100% Tech 237...
This was the way it was 50 years ago on 11 meters when more people followed the rules and the solar cycle was at it's peak.
I can remember 11 meters being open day and night back in 66, the people were collecting QSL cards like Baseball cards.. |
Keithinatlanta
Senior Member
Username: Keithinatlanta
Post Number: 1009
Registered: 3-2003
| | Posted on Monday, June 09, 2014 - 8:03 pm: |
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Wow, what a post with a lot of explanations. That is what I like, I get to learn.
I said this before way back when on this forum:
Buying a good radio and using a "cheap and tiny" antenna is like buying a 55" Big
Screen TV and then using a little set of Rabbit Ears. Spend as much or MORE for best antenna: results are like what Tech 237 said above. Thanks.
Keith in Atlanta
CEF 150 |
Keithinatlanta
Senior Member
Username: Keithinatlanta
Post Number: 1010
Registered: 3-2003
| | Posted on Monday, June 09, 2014 - 8:06 pm: |
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And then, Possum Lodge had to go and mention
BASEBALL CARDS. I cringe as I think how my brother and I had Mickey Mantle, Roger Maris, Willie Mays, ETC ETC ETC. We had shoe boxes full of baseball and football cards from the 50's and 60's. Life goes on. 
Keith in Atlanta
CEF 150 |
Milkman21218
Advanced Member
Username: Milkman21218
Post Number: 595
Registered: 1-2004
| | Posted on Wednesday, June 11, 2014 - 11:02 am: |
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Possum why did you have to bring up the Baseball cards? I also had a few shoe boxes full. And many comic books. Today I could've been rich! Or much better off then I am.
Izzy
CEF#502
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Possum_lodge
Junior Member
Username: Possum_lodge
Post Number: 34
Registered: 5-2014
| | Posted on Saturday, June 14, 2014 - 9:27 am: |
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If I would have invested $10,000 in Apple computer stocks in 1988 instead of buying a new car, I would be worth millions today!
On the downside, a CB radio that sold for $250 - such as the Regency Range Gain - in 1966 / about $2000 in todays money, is barely worth $250.00 today.. |
Dale
Senior Member
Username: Dale
Post Number: 2094
Registered: 12-2002
| | Posted on Thursday, June 19, 2014 - 3:42 pm: |
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joe12 look to left of my post. go to tool<mod list<
then put in yor radio/ model . modulation is vr6
cant remember rf power though but its there
dale/a.k.a.hotrod
cef426
cvc#64
454 [dx numbers]
38lsb
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