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1
Test Equipment / SENCORE CB42
« Last post by Crambone on May 11, 2019, 10:14:14 AM »
My CB42 frequency counter isn’t showing correct frequency, all numbers light up. I checked power to the top board and I’m seeing the 5v and 10v.
Just not sure we’re to start looking. I looked on YouTube and seen a video by The Radio Shop but it wasn’t for counter diagnosis.
Any suggestion on were to start? I did print out all the schematics he had on his site.
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Electronic Video Blog / Re: #119 Sencore CB42 Audio Output Repair
« Last post by Crambone on May 10, 2019, 05:15:42 PM »
Is the rest of the video posted? I have one that generates signal but counter reads wrong
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New member welcome / Re: Hi From North Carolina
« Last post by Geavolty on May 07, 2019, 11:49:40 PM »
I really like these things. Always trying to find information but didn't find the answer
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Other Video Blogs / Re: Design and Build a Buffer Circuit, Tube and Transistor Mr Carlson's Lab
« Last post by Geavolty on May 07, 2019, 11:49:11 PM »
It's very good with what you are doing right now.
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Ham Radio Circuits and Repair / ICOM IC-7800 blown PA and other maybe power surge damage / repair notes
« Last post by VE1IC on May 05, 2019, 09:08:45 PM »
Got an older IC-7800 that has a blown PA to the tune that it needs a complete replacement board. It burnt the PCB crisp so the parts easily move on one side. It blew the 48V traces off the board, ugh. Seems to me I've seen a thread like that before a few years ago, or maybe I am day dreaming again. I am hoping that ICOM is still making this PA.

Other than that the unit does not power up, no stby light nothing. Some repair shop I don't want to name here in CDN had opened it and did some damage to the Ant. SW unit. I do remember that ICOM had problems with the early version PSU's. So I am hoping that the problem is due to the 48V being shorted (because of the PA) or the 15V rail or the -12V rail dead, anyway... something along these lines...

I am not really a stranger to big radios like that, but fixing this is gonna be $$$ and slow. Maybe call it my summer / fall project.
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Ham Radio Circuits and Repair / Re: IC-751 PLL weird problem
« Last post by VE1IC on May 05, 2019, 08:53:11 PM »
anyone has a working PLL unit for sale? I am not sure but if the 745 has the same board than the 751 has. It looks the same...
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New member welcome / Re: Hi all
« Last post by The Radio Shop on April 27, 2019, 09:01:31 AM »
Hi Steve and welcome.
Nice setup and at times we have to do the best we can.
HF mobile can be quite fun. I had a TS-140 and home brew HF antenna and had a great time with it.
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New member welcome / Re: Hi all
« Last post by KE4EST on April 26, 2019, 10:48:20 PM »
Welcome to the forum Steve!!
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New member welcome / Hi all
« Last post by reble on April 26, 2019, 06:40:25 AM »
I am new on this forum. My name is Steve, my ham call is KC7BYP, my home QTH is Kennewick, WA.  I am a General class operator. In my 2008 Pontiac Torrent I have a Ranger RCI-2950 and a Yeasu FT-8900R. I have in my shack a Icom ic-730 HF rig, a Kenwood  R-600 short wave receiver and a  Baofeng uv5ra 2m/70cm  VHF/UHF ht. Right now I can only operate HF via an internet controlled remote base. The free Windows based prog is at www.remotehams.com . I use the remote base because I live in an apt and I can't put up any outside antennas. The remote base setup isn't the ideal setup but it comes in a close 2nd. Without it, all I would have for HF is 10 meters in the mobile. 73s

Steve
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CB Radio Repair Forum / re: a audio feed back loop in a Radio Shack cb radio
« Last post by reble on April 26, 2019, 06:16:28 AM »
This is in a Realistic TRC-474 CB transceiver.  The receiver is making an audio tone in it when it is turned on. The dash panel lights turn on and the TX is showing 5 watts out on my swr/power meter. But the same tone is in the TX modulation when I have a CB HT turned on, on the same ch. I keep the CB HT as a test radio.  The RF gain and the squelch have no effect. The tone goes away in PA mode. The PA mode works fine.  I don't know where to find a service manual for this radio.

Now I have an AA degree in general  electronics. But I primarily fixed electric/electronic typewriters, fax machines and 1st gen to 3rd gen copy machines. I am also a Ham Radio Operator. I probably could fix this CB radio if I had the test equipment. All I have in the way of test equipment is an Ideal 61-340 VOM and an old Echo portable tube checker. I dabble in restoring old tube radios with my room mates help. Now I can't go sticking a probe in the radio with my shaky hands, I have micro  tremors in my hands and I would probably short out something, that's why I had to retire. But my room mate knows enough electronics to be my hands, I tell him where to stick the probe. But without more test equipment and the service manual. I would only be guessing. I could use some help please.

Steve
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