Question about Cobra 148 GTL 120-Channels Base CB Radio

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Output frequency is slightly out, where is the adjuster in the cobra

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They are the small square metal cans with ferrite slugs inside, there are two larger coils at the rear of the circuit board filled with wax...you need to dig out the wax in these coils before adjusting
plus one of the cans is also waxed.WARNING turn these ferrite slugs WITH GREAT CARE AND NOTE THEIR POSITION before
starting as you will be attempting to tune a set with out radio
bench test gear...ALSO there are about 12 trimpots (TRIMMING
RESISTORS) thet set the voltage/current" DO NOT SHIFT THESE FROM THE POSITION THEY ARE IN !!) you can however moove them back and forth BUT RETURN THEM TO THEIR ORIGANAL POSITION (mark with a fine felt pen off the
wiper and onto the carbon track) as these sets are old you still have a chance ? but they have a LARGE number of electro caps
that over the years dry up inside and cause all sorts of problems.
CHEERS & GOOD LUCK FLYINGFOX@PEOPLE.NET.AU

Posted on Jun 22, 2008

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Output voltage adjustment


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1 Answer

Cobra 29


Essentially what is done is replace the RF output transistor with one that can handle the 30 Watts output. Since you are not going to achieve it with higher B voltage, you have to modulate more current, and the bias voltages adjusted to accomodate the different characteristics of the new of the new final. Then the radio is checked to make sure the tank circuit is still in tune.

This is the basic outline of how to do it in a manner where you actually learn hands on, and apply what you should already know.

The alternate method is to install a linear amplifier. A 10 meter linear can usually work with only slight modifications.

BTW. the common search engines are worthless for finding radio mods. By design- they are oriented to a controlled marketplace.

Feb 22, 2012 | Cobra 29 LTD CB Radio

1 Answer

Why is ch 6 om my cobra 29 is now ch7


It sounds like the radio needs to be re-aligned the TX frequency is out of adjustment.

Jan 01, 2012 | Cobra 29 LTD CB Radio

1 Answer

I just bought a used cobra 200 gtl dx im totally clueless to cbs could u tell me where all the controls and buttons should be



  • Hi, I can help.

  • I have uploaded a pic of the Cobra 200 and labeled each knob/switch with letters to reference.
  1. A) Noise blanker - When this switch is pushed the high pitched noises are canceled leaving a more natural sounding receive. Some like it some don't.
  2. B) High Power - This button adjusts the power output of your radio. Inside the radio the pots are adjusted for a low power setting and a high power setting.
  3. C) Roger Beep - This is a beep heard by the person you are chatting with at the end of your transmission.
  4. D) The 10+ KHz - This button when pushed jumps the frequency up 10 Kilohertz to help you better navigate frequencies.
  5. E) This is where you adjust how you are going to modulate. CW is for continuous wave or Morse Code. Unless you have a key don't worry about this setting. FM is for Frequency Modulation AKA the HAM bands. AM is for Amplitude Modulation. USB and LSB are for Upper Side Band and Lower Side Band respectively.
  6. F) is the band adjustment - Each band (A, B, C, D is a set of frequencies.
  7. G) is a dimmer and the SWR calibrate. To use the dimmer push the dim button in a rapid motion. To use the SWR calibrate side press and hold the dim/calibrate button and using the SWR knob on the right side of the radio (L).
  8. H) SWR/, S/RF - If this button is in the out position then your meter will swing as usual. Push the button in to measure SWR.
  9. I) is the volume and squelch. Volume is what is adjusted to how loud you want your speaker. Squelch you adjust to take out the unnecessary white noise.
  10. J) Mic Gain and RF gain - Mic Gain is how much gain you want to your mic. RF gain is how much of the receive you want to pick up.
  11. K) Is the fine and course adjustment that you clarify your frequencies with.
  12. L) You adjust the echo and the SWR with.
  13. M) is the channel selector.





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  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.


Regards, Tony

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1 Answer

How to ajust my cobra 29 to so it will get out to talk


First check the swr's. make sure you have a good antenna, like the 108" whip, others will limit your range, because they are shorter, stay with the longer 7ft types like the predator 10k, or wilson 5000 magnetic mount.
Then just adjust the modulation variable resistor for minimum resistance and it will let your radio have full output power. No cutting!!! Check it with an oscilloscope and watt meter, and check the frequency with a freq counter.
Other things, good quality echo mic. or power mic (cobraHM75$17.99), or even a RK56mic($38.99)...

Mar 02, 2011 | Cobra 29 LTD CB Radio

1 Answer

Reparing 29 LTD


Depending on what you mean by "off frequency". The 29LTD, like all other 40-ch radios is PLL controlled, referenced to a 10.240 Mhz crystal. The channels are all mathematically synthesized by a higher frequency VCO and the PLL controller chip. If the PLL detects the frequency is not "locked on" it shuts down transmission. If the frequencies are there, but "out of band" then I suspect that there has been modifications done to the radio to make it so. If you want the radio back to stock, undo the mods. If the radio is out of band, and no mods present, then there is a problem with the PLL. Sometimes that may stem from someone getting into the radio and "tightening all the screws". (the shops just LOVE those!)
If the channels are in band but seem a little off, there is some adjustment in the form of a small trimmer capacitor near the crystal. But to adjust it properly, you should employ a frequency counter.

Jan 21, 2009 | Cobra 29 LTD CB Radio

1 Answer

Pioneer GEX-FM903XM, system works great, however it often drops out and has just static. The signal indicator is strong. I think there is a bad connection into the radio. Where should I start...


It may be possible that the FM frequency chosen during setup, is in use in your area by a strong signal from a local station. Change to another frequency and see if the situation improves.


The following is from the Operation's Manual:


FM Modulator Setting
You can adjust FM Modulator frequency and output level.
7 Frequency
If output from the FM Modulator is hard to hear due to interference from a strong broadcast
station transmission, you can switch to another frequency.
You can adjust frequency between 87.9 and 90.1MHz.
7 Level
If the output sound is too quiet, too loud or distorted, you can adjust FM Modulator output
level.
You can adjust level between “LEVEL–1” and “LEVEL–7”.
1. Press the POWER button for 2 seconds to enter the FM Modulator Setting
mode.


2. Select the desired frequency
with the left/right arrow buttons.


3. Increase or decrease the Level
with the up/down arrows (buttons).




4. To cancel the FM Modulator Setting mode, press the POWER button again
for 2 seconds.
Note:
• After entering the FM Modulator Setting mode, if you do not perform an operation within about 8 seconds, the FM Modulator Setting is automatically canceled.




Nov 29, 2008 | Pioneer Car Audio & Video

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