Guide :Radio Communications : 148 GTL 120-Channels Base CB Radio

142 GTL Good AM Carrier Weak Modulation????

Weak AM modulation at 50% on Palomar PW-5000 meter. SSB has low forward swing with low modulation?? I have checked many voltages in the past and all that I have checked seems normal. Using SAM's Photofact. Re-align transmitter as per Sams with 2-tone audio generator and still low modulation. Replaced Audio IC TA 7222P no change. Any Ideas???

Research, Knowledge and Information :


Cobra 142 GTL Modulation quality problem - Red Wave Radio


weak modulation on sideband and I noted very low RF output, ... (But good audio fidelity), and I am suspecting that the ... Classic Cobra AM/SSB 142 GTL Base. 6.
Read More At : www.redwaveradio.com...

Cobra 142 GTL Reviews


Cobra 142 GTL Reviews 2013-05-13 15:59 ... I've had 2, they both worked very good on AM and ... About 4 watts carrier and up to about 17 to 18 watts swing is ...
Read More At : cbradioclub.com...

Cobra 142 GTL Modulation quality problem - Red Wave Radio


Cobra 142 GTL Modulation quality problem. ... > > weak modulation on sideband and I noted very low RF output, ... (But good audio fidelity), and I am suspecting that the
Read More At : www.redwaveradio.com...

Cobra 142 GTL Weak Mod Ok AM Power - Radio mods


The Defpom Forum, for RadioMods, ... Cobra 142 GTL Weak Mod Ok AM Power. ... as you had requested and for whatever reason it seems to have good swing on the watt ...
Read More At : www.radiomods.co.nz...

Copper Talk: Cobra 142 gtl.. no speakers... good receive no sound


Copper Talk » Ask The Tech » Radios BASE » Cobra 142 gtl.. no speakers... good receive ... but weak and tinny-sounding it means ... Carrier Balance VR6 - AM Power ...
Read More At : www.copperelectronics.com...

Snake Doctor Cobra Mods - Angelfire


Cobra Mods Radio Modulation ... 142 GTL: CUT R104: ... 7k resistor Tune L47,L48,L46,L45,L38 for max RF output AM Carrier Power VR10 Mod Meter ...
Read More At : www.angelfire.com...

Copper Talk: Cobra 148 GTL Mods Needed


Cobra 148 GTL Power Tweek and Modulation 1) ... MODULATION! lol, good luck ... VR10 adjusts AM carrier
Read More At : www.copperelectronics.com...

COBRA RADIOS & MODIFICATIONS - Angelfire


COBRA RADIOS & MODIFICATIONS ... No Audio on AM Transmit with good Carrier, ... Set output of signal generator to 27.185 AM, 1000 Hz. @ 30% modulation.
Read More At : www.angelfire.com...

Suggested Questions And Answer :


142 GTL Good AM Carrier Weak Modulation????


Have you checked TR 26 AMC amp, and TR 24 & 25 AMC amps also for SSB TR34 ALC amp. make sure all voltages are right if all checks out try lifting out of the board or cut the collector of TR24 and try it. oop's that slipped out.
Read More At : 148 GTL 120-Channels Base CB Radio...

On rx , i have a low carrier , sometimes cannot hear someone vs another radio


Depends on how it was modded? Were both the TX and RX broadbanded and tetuned?? Possibly poor work..
Read More At : 148 GTL 120-Channels Base CB Radio...

Can not recieve properly


IN your CB there are 25 tuneing slugs (square matal cans with ferrite tuneing slugs) if you speaker output is low leavel but still clear and free of hash the set should be ok , but you will need to tune these slugs with a small jewlers screw driver (WITH GREAT CARE) as the slugs break easy. If you want to email me it will not be a problem ,cheers , DENNIS [email protected]
Read More At : 148 GTL 120-Channels Base CB Radio...

Can not recieve properly


Mounted on the circuit board is a tiny black encased rx/tx changeover relay. It is almost in the center of the board and one third to the left (facing the controls) and may be etched MRATA. I would be looking at that. These sets are subject to a lot of problems as they age and can be fixed with a BIG HAMMER!! CHEERS [email protected]
Read More At : 148 GTL 120-Channels Base CB Radio...

Have a cobra 148 gtl cb/ssb. It is brand new. I hvae it hooked up and have tuned the antenna using the swr meter on the cb. I habe channel 1 and channel 40 metting at about 1.6 swr. I have what appears to be good distance reception but little output.


Hi, my name is John. Welcome to FixYa. Check your antenna, you need to set it with a real SWR meter, pick one up at any near-by CB shack $10.00. Thanks for choosing Fixya...John
Read More At : 148 GTL 120-Channels Base CB Radio...

No modulation with strong carrier


Sounds like your Audio Output went out......not audio chip....may be your voltage regulator also....your voltage regulator IC is heat sunk....do you have a schematic?
Read More At : Cobra...

No AM carrier or modulation. SSB transmits good


Great now check TR42 AM POWER then check TR41 AM POWER REG. They are on right side twards rear of board with front of radio faceing you part side up. A good place to start!
Read More At : 148 GTL 120-Channels Base CB Radio...

Cobra 148GTL Missing TX Modulation


Check voltage regulator
Read More At : 148 GTL 120-Channels Base CB Radio...

Just bought this radio new, everything works great but the weather band.i can only get 1 channel and it's very weak. i have a good antenna and swr is fine.


If you bought it new I would take it back sounds like a problem with the radio get a new one and try it.
Read More At : 29 WX NW ST 40-Channels Base CB Radio...

Tips for a great answer:

- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.
next Question || Previos Question
  • Start your question with What, Why, How, When, etc. and end with a "?"
  • Be clear and specific
  • Use proper spelling and grammar
all rights reserved to the respective owners || radiocomunicate.net || Terms of Use || Contact || Privacy Policy
Load time: 0.1838 seconds