iFixit - Active Questions With Device "CB Radio"

CB Radio: President Grant AM SSB needs help.

Sat, 10 Jan 2026 00:24:28 -0700

I have a President Grant 40 channel. AM SSB. It appears to be recieving as it sounds like it when antenna is connected. It has a external VFO. Antenna is nice at 27mhz. Its new to me and I havent had the back of yet. Questions.

What exactly is my VFO for?

My signal strength needle does not seem to work,does not move much?

My select switch could be bad as I have LSB but it is dead quiet on AM and USB

The radio come with a small kenwood mic, which did not work, another new CB mike I had here seems to work. The light comes on when triggered. The VFO has an on off switch, do you think I will ever use it? When it triggers the signal meter shows a small movement.

The signal meter rises up with modulation when I key the mic and speak.

⟐ Edited by author January 10, 2026 at 0:24 MST

Kenwood TM-241a: Memory problems, erases when radio is turned off.

Fri, 28 Nov 2025 04:36:04 -0700

My Kenwood tm-241a has a new battery and still doesn't keep the memory. I program the memory and it will work until I turn the radio off for more than 3 seconds then it erases the memory. I replaced the 2032 battery and still same problem. How can I fix this?

⟐ Commented November 28, 2025 at 4:36 MST

Cobra 29 LTD Classic: My rx/tx light turns red

Sat, 09 Aug 2025 09:13:20 -0700

When I key my mic the rx/tx light turns red. When I unkey it turns back green. I also cannot recieve anything coming in nor can I get out. Please let me know what you think

⟐ Answered August 09, 2025 at 9:13 MST

CB Radio: no transmit but shows good output

Tue, 13 May 2025 18:22:23 -0700

cobra 29 ltd wx classic, good receive no transmit.showes it has good signal but no one hears it

⟐ Answered May 13, 2025 at 18:22 MST

CB Radio: President HR2510 CB radio display turns on but no channels showing

Wed, 30 Apr 2025 08:01:09 -0700

Recently bought this Uniden President HR2510 amatuer radio. I am trying to turn it on and it seems to at least power on, but the display shows no channel and no bars from the audio system. I attached a photo of what it shows. I did some research and maybe it was the old brownish glue that is causing a short? So I took the time to take it off in different areas. But still same issue. Any ideas on what to look for? Below is a photo of the current display when I turn it on. I tried a "master reset" but nothing happens.

⟐ Answer accepted April 30, 2025 at 8:01 MST

CB Radio: CB neither receiving or transmitting

Tue, 19 Nov 2024 12:21:44 -0700

I have a Cobra Ultra Mini AM/FM. The power turns on and displays function. I have a Viper mobile antenna connected by 15 feet of cable. The SWR meter, Sure Com, shows no SWR reading and while the radio powers on, there's no reception or broadcasting. What am I doing wrong?

Cobra 29 LTD Classic: Power Mike not working on radio

Fri, 23 Aug 2024 05:15:59 -0700

I bought a PCM 1000 power microphone to connect to my Cobra 29 LTD classic.

When I plug it in I get received when I key it up the needle swings and I get a lot of squill I get talkback over my speaker and when I turn down my mic gain and the gain on the microphone I get hum any thoughts or suggestions would be very helpful thank you. By the way the radio normally does not have TalkBack at all.

⟐ Answered August 23, 2024 at 5:15 MST

Cobra 29 LTD Classic: Why am I getting no sound

Thu, 08 Aug 2024 20:52:06 -0700

Everything works as it should but I am getting zeroes down

CB Radio: Wiring diagram and colors for Cobra 29 LX Max microphone.

Thu, 07 Dec 2023 09:50:38 -0700

All of the wires came unsoldered from the plug on my microphone for my Cobra 29 LX Max. When I take the microphone apart, it appears the two extra wires are for:

Yellow = Extra microphone for the phone audio.

Green = Possibly data for the three buttons on the front. Such as Repeat, Report and Bluetooth.

From watching videos online, I can probably figure out the other four, but I’m not sure how to test for the extra Mic and Bluetooth on the radio side. Not sure which pins they go do. The only pin I’m sure about at the moment is ground is pin #1 as it’s the only one that didn’t get broken off.

⟐ Answered December 07, 2023 at 9:50 MST

CB Radio: CB not transmitting or receiving very far and is intermitent

Sat, 16 Sep 2023 11:11:44 -0700

CB not transmitting or receiving very far and is intermittent . All settings seem to be fine, aerial is only 12 months old. Connections seem fine. Any chance you could suggest a remedy or fix please?

⟐ Commented September 16, 2023 at 11:11 MST

CB Radio: Cobra 29 lx lcd Rf power guage working and PA but not transmitting

Thu, 27 Jul 2023 12:10:15 -0700

The swr metre calibrates and shows receiving in transmitting but doesn't pick up on the other CB radio I have. I've tried with other CB and aerials and still not working the dynamike and the PA work fine and the receive Meter moves on the receiving radio but there is no sound.

Any advice on what to test woud be very much appreciated.

⟐ Answered July 27, 2023 at 12:10 MST

CB Radio: Radio Blowing a Fuse

Sun, 19 Mar 2023 20:02:09 -0700

Reposted for @matty77204:

I have a cb radio a COBRA 148F GTL am ssb with freq counter so it use to work i could plug it in and it work One day i got stupid and hook the power cord up to the 148F GTL and stuck the power cord into the power cord strip surge protector and it blew the fuse and i pulled the wires out a day later i replaced the fuse in the power cord and hook my cobra 148F GTL and it turn the radio on nothing but it blows the fuse in the line i then changed the fuse and hook my other COBRA 29 LTD bluetooth up it turns on off display works fully working so i was wondering if you know the cause of why my cobra 148F GTL wont turn on and when i turn it on it blows the fuse all the time.. Looking for answers. Thank you for your time... Matt

⟐ Commented March 19, 2023 at 20:02 MST

CB Radio: CB Radio not functioning - white noise only

Wed, 26 Oct 2022 01:27:18 -0700

I’m trying to get a CB radio (~27MHz) up and running but I’m a bit of a novice. I believe I have the correct equipment, but on all 40 channels I only get white noise of varying strengths. I live in the middle of a city so I would expect to hear something. I will list my equipment below in hopes that that is the issue, other wise I am open to any troubleshooting steps people have in mind. Thanks in advance!

Radio: Uniden PRO505XL - Amazon page no longer exists

Power Plug: Roadpro 12V Fused Replacement Cigarette Lighter Plug with Leads - RPPS-225 - https://www.amazon.ca/gp/product/B0016LG...

AC to DC Adapter (for use in house): AstroAI AC to DC Converter, 10A/110Vto12V DC/120W/7.78FT - https://www.amazon.ca/gp/product/B07JGS8...

Antenna: Bingfu CB Antenna 27MHz CB Radio Antenna Soft Whip Magnetic Base CB Antenna BNC & PL259 - https://www.amazon.ca/gp/product/B086YYW...

⟐ Answered October 26, 2022 at 1:27 MST

CB Radio: Why is my radio off frequency

Thu, 28 Jul 2022 19:12:34 -0700

CB base station Texas Ranger TR696F – SSB,

On receive clarifier must be all the way counterclockwise to try to tune in stations,

On transmit other stations tell me I am off frequency,

Radio has good output power.

⟐ Answered July 28, 2022 at 19:12 MST

CB Radio: CB flicks rapidly between RX and TX when I key the mic with linear tur

Mon, 29 Nov 2021 13:31:19 -0700

My cb works just fine until I turn on my linear then when I key up it flicks rapidly back and forth between RX and TX. If I hold the mic close to the radio it stops. Any idea what might be causing this problem?

CB Radio: Cobra 29 LX Max T Back disabled all audio, also can't transmit.

Mon, 31 May 2021 13:20:24 -0700

I have a lightly used Cobra 29 LX Max, that I bought from my brother which he bought new and only used it a few times. I installed it in my Jeep and it worked great for about a month. Now it’s acting really strange. When I had T Back switched off, all audio turns off, even the weather channel is quiet. I see the Receive indicator on the LCD lighting up, but can’t hear anything. I switch T Back back on, even at the lowest volume, and all my audio volume comes back on.

Also, when I key down the mic, the meter swings over but doesn’t move when I talk into it. No one can hear me, and also T Back doesn’t repeat anything I say. They can hear me key down over the air, just no voice comes through.

I’ve calibrated my antenna, also switched to another magnet that was also calibrated. They both do the same thing. I did make sure the test antenna was on the body of my Jeep for ground. I’ve opened the CB but down see anything obvious. No burns, no mud, no loose wires. I’m not afraid of soldering, just looking to some people with experience before I start anything crazy. Any help would be greatly appreciated.

⟐ Commented May 31, 2021 at 13:20 MST

CB Radio: connect a different Mike to my superstar 4900b but it blows out

Mon, 05 Apr 2021 06:47:46 -0700

I try to connect a different Mike to my superstar 4900b but it blows out my keying out. Is there anybody you know can give me advice about how to fix it

⟐ Edited April 05, 2021 at 6:47 MST

Cobra 29 LTD Classic: Won't calibrate the radio to antennae, gauge won't reach the mark

Thu, 01 Oct 2020 20:42:08 -0700

When I try to calibrate it it makes it about 3/4 over to the mark, but won't make it all the way. Does anyone have any ideas?

It was neither SWR or modulation I was just calibrating the radio to the antenna.

⟐ Edited by author October 01, 2020 at 20:42 MST

CB Radio: need a transformer for cobra 29

Mon, 07 Sep 2020 20:45:08 -0700

blew protection diode bad no fuse the transformer next to it melted .I dont know the volts tobuy another.

⟐ Answer edited September 07, 2020 at 20:45 MST

Cobra 29 LTD Classic: turns on but wont key up.

Wed, 22 Jul 2020 05:29:05 -0700

My radio turns on but ever time i try to key it, it never read on the meeter or the red light never comes on. It do this every now and then so it works when it wants to i guess. Just would like to fix it since i need it for work. Thanks.

⟐ Commented July 22, 2020 at 5:29 MST