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Breadman30
| | Posted on Friday, September 19, 2003 - 6:25 pm: | 
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thanks for reading guys tell me some news about this radio(dx44) and also will my rk56 mic work off of my DX949 on the 44 thanks in advance..
also please educate me in the 10kz thingy?
thanks to all who will read this!!! |
Kc0gxz
| | Posted on Saturday, September 20, 2003 - 2:35 pm: |
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Breadman30
Yes, your RK-56 will work on your new DX-44.
The 10Kz switch that you are refering to will take your radio one channel higher when switched on. It's purpose is to be able to get to the frequencies (known as the A-channels) that lay between 3-4, 7-8, 11-12, 15-16, and 19-20.
Since the 10Kz switch (when turned on) channels the radio UP one channel, your channel selector should be on either channel 3, 7, 11, 15, or 19 to get to the A-channel.
This also works for these missed channels in all bands.
Hope this helped you some.
73s
Jeff, kc0gxz. |
Breadman30
| | Posted on Saturday, September 20, 2003 - 7:42 pm: |
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ok thanks that helps alot i here the truckers
all the time on 19 say hit your 10 case slide and then you can`t here them anymore..I here the 44
will do about 30 watts when tuned ... i use to own
a 33 so i think the only difference in the 2 are the 10kz and roger beep if not please tell what
else may be different thanks for the reply and thanks in advance for more replys!! |
Breadman30
| | Posted on Tuesday, September 30, 2003 - 8:45 pm: |
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I got my radio in about 3 days which was awsome
I installed it, got my swr to about 1.1 the only prob i`m having is it squeals when mic gain is up and the talk back is on? i have tryed to put the ext speaker in front of the radio and behind my head. the factory ext speaker in my truck is above the drivers side which is the best speaker in my opinin because i can here it better.I have a Road king 56 mic, also it seems to start the sqeeling when the radio is on for a couple of hours. it doesn`t seem to do it as bad until the radio has been on awhile. is there some kind of prob or is this normal. my dx949 didn`t sqeel at all with talk back on full blast also i have had a 33 it didn`t do it either. also i didn`t get a watt count on it does anyone have any idea of how much power this radio has also if can break it down on the rf knob as far as like a little to a lot... anyway thanks in advance breadman30
ps on the 33 i had i used a astatic636 noise canceling mic think mabe this will help? |
Tech671
| | Posted on Wednesday, October 01, 2003 - 7:19 am: |
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It's not uncommon for the export radios with talkback to squeal with a standard mike. The 636 attenuates the sensitivity of the mike so much that it will usually stop this.
Also be aware that poor antenna or radio grounding can increase talkback volume. |
ss8541
| | Posted on Wednesday, October 01, 2003 - 11:21 pm: |
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in reference to your 09-20-03 8:45pm post, this isn't an uncommon situation. the fact that it starts after the radio has warmed up isn't very common but nothing to really worry about. it is just showing itself due to some changes in the components due to heating up. the audio ic is mounted on the chassis of the radio right between the 8v reg and the am modulation amp/reg. so it(and the associated components) will see some heat changes for sure.
the biggest reason that the galaxy radios squeal is because the limiter has been removed. i'm pretty sure that copper does not do this, so that shouldn't be your problem. out of 7 or so galaxy radios, you'll will always have one galaxy that is too loud and one that is too quiet(by most users standards). for the ones that are too quite, you can use the resistor modification that is on the galaxy site. many people think that it is to reduce the talkback level, but it is not. to reduce the talkback level(a.k.a. stop squealing), you can add a .1-.01uf cap from pin 4 of the audio ic to gnd.
as for power output, i get on average 28-32wpep(true pep) from just a basic tuning and no screwing with the low pass filter section(what others call super tunes). on a dosy/astatic type meter and a well tuned antenna, this would be about 20-25w.
tech 671 is also right about a poorly tuned antenna. if this is the case, this can cause excessive heating of the radio, and will also aid with the squealing once the radio has heated to a certain point. the antenna system may provide the enviorment, and the heated components the action. we use snap on ferrite chokes on the coax and mic cords to stop this problem with tractors that have poor gnd planes(fiberglass body). you can also roll the coax into a small coil right at the antenna connector. if you have zip ties, you can keep the coil together with those. this will work, i have done it before when we didn't have any chokes. but, it will only work if the antenna system is the problem. something to try in any case, can't tell you for sure since i don't know your set-up.
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Breadman30
| | Posted on Thursday, October 02, 2003 - 8:01 pm: |
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my swr is good so if it was a antenna prob would`nt my swr be bad? I also use the termial post in the truck for power and ground .. i don`t know how good of a ground this is so today i added a wire to it and grounded to another part of the truck and it stopped sqeeling but this was after radio was off for awhile and it was around quitting time so i don`t know if it sovled the prob or not? I really think it is my mic I have heard ppl have had hard times with RK56 mics and galaxy radios i ordered a astatic 636 from coppers tues night so i will try that.. I also
sanded the paint off the mirror mount thinking it may not be grounded good this did nothing? the thing that freaks me out is the talk back gets really loud before the sqeeling starts i can cut the radio off for awhile and then it is fine...
i guess i could try to coil the coax but i would think that would hurt my swr? i have it radiated across the dash now>. anyway thanks for the input guys i`ll keep messing with until I get it right I just don`t want to trash can my new radio so maybe it want burn it up.... Thanks breadman30 |
Marlboro_Man
| | Posted on Thursday, October 02, 2003 - 9:05 pm: |
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from my personal experience the talkback on a Galaxy is very touchy!! Very loud one minuite and then so quiet you can't even hear it the next. I usually have the talkback disconnected in a galaxy radio. |
fancypants
| | Posted on Friday, October 03, 2003 - 11:56 am: |
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The talkback on a Galaxy is NOT a "special circuit". It is basically an "RF sniffer" that picks up and amplifies stray RF inside the chassis of the radio.
If one has a poor antenna ground, makes & breaks antenna ground at random, has a high swr, has the coax all wadded up or wound in a a random "choke" or "coil" ( don't do this unless you know what you are doing ), the talkback will be too loud and you'll be squealing. This has to do with the increased amount of reflected power being fed back down the coax and "floating" in the radios' chassis. The increased RF inside the chassis is picked up by the RF sniffer and the talkback gets louder as the situation occurs. If you've got a constant loud talkback with squealing, you've got a constant antenna problem. If the problem comes and goes, you've got an intermittent antenna / grounding problem.
As far as your antenna being properly tuned, most swr meters are not very accurate. They can easily be fooled by changing coax line length, having the coax improperly configured, using the wrong impedance cable ( one side of a dual coax or using two single coax cables for duals using a "T" connector ), etc... This is not to mention that some swr meters are just plain "junk". I've had guys bring in meters for me to check them for accuracy. When verifying proper operation with a known swr of 3, the meters would show a flat or VERY low swr. As such, they could have very high, poorly tuned antenna systems and the meter would tell them everything was okay. Using an swr meter of unknown calibration is kind of like using a yardstick that is 34" as a reference. Nothing jives with other measurements and you'll always come up short.
First of all, get your antenna on the driver's side of the truck if it isn't already there. Pull your mount apart, clean all the connections piece by piece, straighten out your coax as best possible, run an 8 or 10 gauge wire from the antenna mount to the door hinge and then from the door hinge to the frame. You have to have metal to metal connections i.e. no paint, primer, rust, grease, salt, etc.. Once you've done all this, tune the antenna with a known good swr meter.
As a side note, be careful what you use for coax. Much of the coax on the market today is lower grade material and of an improper impedance. This is on top of the fact that most "techs" couldn't assemble a proper piece of coax if their life depended on it. Many do not know how to solder, do not connect the shield as should be done, leave solder holes open and moisture can seep in, use those horrid "weather boots" which will trap and retain moisture once it gets inside the boot, etc...
Once you get moisture in a cable, it wicks WAY down it inside. While the cable may still be able to be salvaged, you'll have to cut it back to the point where the copper is very clean and shiny. If in doubt, throw it out.
If you are using something other than a coax with a copper shield ( jacket color doesn't matter here, i'm talking about actual conductors here ), get rid of it. That "clear silver braided" stuff is junk regardless of what you were told or paid for it.
Length of cable DOES matter and some lengths are harder to work with than others. If you find that you HAVE TO use a specific length to get the swr down, your antenna system is NOT right. What is happening is that the antenna is not resonant and you are radiating off of the coax. This is called feedline radiation and is a BAD thing. When you change the length of the cable and the swr changes drastically, that's because the cable itself is radiating and has become an active part of the antenna system rather than just a passive signal carrier from point A to point B.
Keep in mind that a nearfield reflection at the antenna could also cause a squeal. While this would normally show up as a less than optimum SWR, having ones coax all wadded up and / or using less than a truly accurate swr meter will not reveal this problem.
As such, your communications gear IS a "system". One piece will affect the others and you are only as strong as your weakest link. Your antenna SYSTEM is 60% of your performance. After all, all of your incoming and outgoing signals HAVE TO pass through the antenna system in order for the radio to do anything. If the radio is acting up, you've either had the wrong fingers inside of it ( chances are ) or the radio is responding to the mess that it is hooked up to ( another good chance ).
There are less than a half dozen "good" shops in the entire USA, so be careful with who you let work on your gear and who's advice you follow. |
Breadman30
| | Posted on Saturday, October 04, 2003 - 7:54 pm: |
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I tryed the choke still done the same thing
when the radio was on for about a hour it would start to squeal then i turn the mic gain to about half way on and it will stop... this only occurs with mic gain all the way on or just about all the way on... Could my mic have some kind of prob? maybe the mic is not grounded right?
I don`t know I have had this prob one time before with another radio it turned out to be mic. I got a new one yesterday astactic 636 will try this monday, also bought new coax so maybe this will help.
I have done all I know to do... if this don`t
fix the prob I will inlist the help of pro radio man for some hands on anyway thanks for all the help and advice!!!!!!! Breadman30 |
Breadman30
| | Posted on Tuesday, October 14, 2003 - 8:55 pm: |
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come to find out it was my antenna setup. I had the coax looped on the dash of the truck right behind the radio... I used the stock setup that was already in the truck pre wired from the factory... and it stop doing it .... the reason i did`nt originally go with this is because it is cophased and i was afraid i would have a prob getting the swr right with twin antennas... anyway it stopped after this setup.. I also
grounded the chassi of the radio to the chassi of the truck and changed mics went from a RK56 to astatic 636L so maybe some of that helped to but anyway thanks for all the help !!!! I really feel it gets out and receives better with twins I know it is all in my mind because one will do about the same as 2 but it really does seem like it!!!
very happy with my radio now ... thanks all!!! and thanks coppers!!!!! |
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