20 Most Recent Uniden GRANTLT 40-Channels Base CB Radio Questions & Answers

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Take this to a shop that does it for a living, they have the correct equipment needed to align this rig

It is important to tune your CB radio antenna to the proper length. The length must exactly match the wavelength of the frequency you transmit on. Or be really really close.

All Cb antenna's have a way to adjust the length of the antenna. If it's a mag mount, the metal whip can be slid in and out of a metal collar. Usually a set screw. If its a fiberglass whip, the way to tune it is on top. It either has a small metal rod with a set screw to adjust the length, or it threads in and out to adjust length.

Either type you have it will need to be adjusted for proper length. Here is how to tune the antenna to lowest SWR.

Some radios have a built in SWR meter. Some do not. If yours doesn't have an SWR meter, then you have to use an external SWR meter. Radio shack carries one, and you can find them cheap on ebay.

If you have a built in SWR meter or external, the procedure is the same:

1. Turn the radio to CH 20.(This is the center of the band.)
2. Switch the meter switch to CAL. (CAL stand for calibrate.
3. Key the radio. (Important. Do not talk while keying the radio.)
4. turn the CAL knob up until the meter hits the CAL mark.
5. Now while still keying the radio flip the meter switch to SWR.

Where the meter falls after that point is you SWR reading. If its above 3, that is real bad. 2 is not gonna kill your radio but its not the greatest. 1.5 and under is a good place to be, but the lower the better.

If your SWR is high, Here is how to find out if your antenna is too long or too short.

1. Turn to CH 1
2. Repeat SWR procedure. You must calibrate every time you do it.
3. Remember the SWR reading.
4. Turn to CH 40.
5. Again repeat SWR procedure.
6. Compare the reading between CH 1 and CH 40.

Now if the SWR is higher on channel 1 then channel 40 your antenna is too short. You must make it longer.

If the SWR is longer on channel 40 then on channel 1, then the antenna is too long, you need to make it shorter.

Make height adjustments about an eight inch at a time, and take reading each time.

once the SWR is significantly lower and the reading on channel 1 and 40 are about the same, you a about matched. At this point turn the radio to the center of the band, channel 20 and take an SWR reading.

You should now have a low SWR reading, 1.5 or under. If you are 1.5 or under, you are good to go.

If you cannot get the SWR to an appropriate level, there may be an antenna problem.

There is a transistor that causes that--right rear on side wall strictly for AM transmit audio--TO220 type and if I remember right is a NTE OR ECG 153.Look for it to be open and not shorted.

Beware that there is no carrier or deadkey on sideband. So there will be no meter movement until you add audio.

I have not checked the similarity of it but with the Grant LX which i have the older Cobra 148 are near clones.
http://www.cbtricks.com/radios/uniden/grant_lt/index.htm

Hope this helps

• Hi I can help.
• For the Grant 40 channel CB there are 40 frequencies I will list below.
• When you refer to the upper and lower channels for this raidio you must mean USB (Upper Side Band) and LSB (lower side band).
• This is called single side band modulation which is to say the the carrier is removed from the upper or lower sideband depending on which your pick and the signal goes farther on less power.
• So the upper and lower side bands are the same frequency just upper side band or lower sideband.

1. 26.965 MHz 21. 27.215 MHz
2. 26.975 MHz 22. 27.225 MHz
3. 26.985 MHz 23. 27.255 MHz
4. 27.005 MHz 24. 27.235 MHz
5. 27.015 MHz 25. 27.245 MHz
6. 27.025 MHz 26. 27.265 MHz
7. 27.035 MHz 27. 27.275 MHz
8. 27.055 MHz 28. 27.285 MHz
9. 27.065 MHz 29. 27.295 MHz
10. 27.075 MHz 30. 27.305 MHz
11. 27.085 MHz 31. 27.315 MHz
12. 27.105 MHz 32. 27.325 MHz
13. 27.115 MHz 33. 27.335 MHz
14. 27.125 MHz 34. 27.345 MHz
15. 27.135 MHz 35. 27.355 MHz
16. 27.155 MHz 36. 27.365 MHz
17. 27.165 MHz 37. 27.375 MHz
18. 27.175 MHz 38. 27.385 MHz
19. 27.185 MHz 39. 27.395 MHz
20. 27.205 MHz 40. 27.405 MHz.

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

Regards, Tony

Turn up your RF gain. If that isn't the issue, then the mic may be damaged. Try a new mic.

Wiring 1 4 pin D104 mic to a Uniden Grant CB is as follows -

• Pin 1 - Shield - Shield
• Pin 2 - Audio - White
• Pin 3 - Transmit - Red
• Pin 4 - Receive - Black

Regards, Tony

hi what seems to be the problem with this

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

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

No fault of the Grant, just that the radio is demodulating the powerful RF of the Grant. It just happens no real cure, nature of the "beast". Only thing I can suggest is to move the radio away from the CB station or lower the mic gain or simply turn it off.

The old Regency radios used a 'stereo' 1/4 plug (3 circuit). Back ring was ground, center ring was switch to PTT to ground and tip was audio line. Is your plug a 'stereo' 1/4 plug?

If you have talk back, that most likely why you have feed back. If its on a switch, turn it off. When it was put in, it was done too loud. You can also turn down the gain on the mic.

we can help you with it. whats the problem and does the pa work?

without looking at it I'd say your voltage regulator unless you're lucky to just have a bad soilder