Question about Uniden GRANTLT 40-Channels Base CB Radio

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Need a schematic diagram on a uniden grant lt

Hi everyone, i need a circuit diagram or full schematic on a uniden grant lt 40 channel ssb i purchased this but the 2 wires for the internal speaker are off i cannot find where they go,thanks david nsw australia

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Posted on May 18, 2009

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Hello David,
I have the exact same radio here with me. Look into the back corner of the radio (parts side) where the P.A. & Ext. SP. jacks are, just behind the ext sp jk you should see a small rectangular box and it should say brn next to it. Their will be 2 holes in this box and thats where you connect the internal spkr at. Hope that helps!

Posted on Mar 29, 2009

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this is a good place to start


Please take a moment to rate this solution thanks

Posted on Jan 29, 2009

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Sep 03, 2011 | Uniden GRANTLT 40-Channels Base CB Radio

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Probably VR 10 on that radio. You are not really de-tuning the radio, just reducing the carrier power on AM. If you're driving something else, You may also want to adjust VR 11 for a reduction on SSB

Apr 02, 2010 | Uniden GRANTLT 40-Channels Base CB Radio

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Neeed a circuit diagram on a uniden grant lt need to find out where 2 speaker wires go on the board

You can get one at Take off the cover, with circiut side down, look in the right side corner, they will be marked as SP hope this helps

Jan 29, 2009 | Uniden GRANTLT 40-Channels Base CB Radio

1 Answer

Uniden grant

I had this same problem on a Realistic Navaho, TRC-30A that I purchased in the mid 70's (I still have it by the way).

The cause of my radio to do this was a shorted diode in the keying circuit on the main board. The shorted diode effectively did the same as keying the microphone.... without the microphone being connected.

You need to find the schematic for your radio and check for shorted components on the keying line. If you don't have a schematic, you can unplug the radio and use a ohmmeter and check for a shorted diode or transistor in the keying circuit.

Please let me know if I can be of further assistance to you.

Good luck!
- Jim

Feb 15, 2008 | Radio Communications

1 Answer

No Modulation!!


Most modulation problem could be traced to:
1. mic or the cable and/or the mic connector;
2. AMC (amplitude modulation control) - it's a single transistor that regulates modulation and occasionally has been known to clamped on the mic audio;
3. the AM/SSB switch - spraying with contact cleaner is a temporary remedy; and/or
4. audio amp - however if your receive audio is good, then this does not apply.

Hope this be of initial help/idea. Without a model number, I can't be more specific as to component(s) or PCB location but pls post back for any developments (or lack thereof) or should you need additional information.

Good luck and kindest regards.

Feb 09, 2008 | Uniden PC78ELITE 40-Channels Base CB Radio

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