Question about Standard Horizon Spectrum Fixed Mount CB Radio

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Cb radio i have no rescive on my cb radio but transmits do u no what could be wrong tried all the common things like speaker and wires

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Re: cb radio

This radio has stand up if boards. These boards see to creat cold solder joints in them and the come loose from the main board. I suggest you resolder all the connections on the stand up boards and I'de guess the problem would be corrected. Good Luck
NC Electronic
Mills, Wyoming

Posted on Jan 07, 2008

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I have a Vintage kinematix reverb with 5 wires red,yellow,white,brown and black how I hook it up what are the wire? it also has a delay tuning knob

usualy you have a transmit recieve switch
like this
RX <<-- >TX ptt

so three wires
the ptt button common in a cb with 4 pins is also ground
should be
black screen and i think brown
but you need to meter out the ptt common and RX TX
for rx audio switched radios then one pin is RX one pin is TX one pin is common or ground for the PTT and also ground for the screening copper braids and also ground for the transmit audio
so you have 5 wires
3 will be PTT 1 will be audio and one audio ground
usually white or yellow
so i think black and yellow or black and white
black being ground

just look up the schematic or service manual for your CB
and check out the 4 pin plug config
there is only two usual ones
cybernet or uniden so.. easy stuff
look for like cybernet cb 4 pin wireup in google or similar
remember just meter out using the beep test range on a cheep multimeter too see which three are the PTT
so the common of the ptt needs connected to the copper screening and also to the black wire all to the ground pin on the 4 pin plug
you can short from the ground pin on the cb side to its TX pin and the set will enter tx mode
same with rx audio enable {if uses most cb post 1984 dont use RX audio hard switching}
so just three pins to worry about

Dec 03, 2014 | CB Radios

1 Answer

Feedback through speaker during transmit


Feb 24, 2013 | Radio Shack TRC-503 CB Radio

1 Answer

My cb radio is on but cant hear nothing sound is turn up but nothing come out

You didn't include the make / model CB you have, so I can only offer general suggestions. If these do not work, please provided the missing info.

Start out by locating and setting the the Volume to a position between 1/4 and 1/2 way clockwise, the Squelch to fully counter-clockwise and the "RF Gain" to fully clockwise to "MAX".

Check the position of the "PA / CB" switch and set to CB. When set to PA, both receive and transmit audio is sent directly to an outdoor speaker (instead of through the transmitter and antenna for reception by other radios). The PA speaker is usually connected to a jack at the rear of the radio. When the PA / CB switch is selected, the internal speaker is silenced even if there is no PA speaker connected.

At this point, you should hear static or voices (with an antenna connected). Do not attempt to transmit without a properly tuned antenna connected. If no sound is heard, there's something else wrong.

May 22, 2012 | Uniden Pc 78xl Cb Radio Mobile

2 Answers

148 gtl receive issues

The problem is in the audio output chip usually bolted to the inner chassis. Sometimes the chip developes a hairline crack, replacement recommended.

Mar 14, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

I have a TRC 502A CB radio that hasn't been used in about 5 yrs. I recently tried to use it and when I transmitted, the audio came thru the speaker. Any idea what's wrong?

it could be grounded inside...Somebody may had it set for Talkback features.. Take it apart look for speaker wires (see if soldered to resistors) if its shorted seperate wires ..just have speakers wires attached. Try external SPKR. Try different mics or radio may have gone bad completely.

Apr 07, 2011 | Radio Shack TRC-503 CB Radio

1 Answer

Transmits but does not receive. cobra29LTD Can it be a active copponent

where is the RF gain? It should be all the way up.

The other thing that can cause no receive. Its a common issue. If you have a mic with a broken wire in cord, if its the wire for receive, then when the key is released the radio will not go into receive mode. The switch in the mic determines weather the radio is in transmit mode or receive mode.

So make sure the RF gain is on max, and try another mic.

Sep 26, 2010 | Cobra 29 LTD CB Radio

2 Answers

Cobra 29 ltd chrome quit transmiting still have pa and talk back changed driver and final still nothing any ideas

Have you check your voltage regulator. 2 outer legs should read 13 volts middle 9 volt. Around and about.

Nov 15, 2009 | Cobra 29 LTD CB Radio

1 Answer

Modulation style woodspeaker

i am not sure what a wood speaker is ,unless you're talking about a home speaker.if you are coming through stereo
speakers take any excess wire on the speaker and coil it up as many small loops as you can and tape or wire tie them.this creates a trap.this works on just about any thing picking up you're signal.

Aug 30, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

3 Answers

Road king micophone


Most standard CB microphones are 4 wires:
Audio IN (from Mic)


To determine which is which on the radio side:
a. the Audio IN (from Mic) would read a high resistance to ground (chassis) of CB radio;
b. the Speaker when connected to the ground would activate the receive speaker. To verify, power up the radio, squelch all the way down, when shorted to ground, speaker will produce background noise/sound;
c. when PTT (TX) is shorted to the ground, the rig will transmit and the red TX indicator will light up;
d. Ground. when tested with an Ohmmeter to the chassis will read 0 ohms.

Hope this be of some help/idea. Pls post back how things turn up or should you need additional information.

Good luck and kind regards.

Nov 12, 2007 | Cherokee CBS2100 40-Channels Base CB Radio

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