Search results

open it up. read what board number is on it. EPT360014 ? ? ?

I recently got rid of My Kenwood TS-450, that has been sitting around for 20 years, due to not being repairable. The known "display dot issue" and "UL" in Morse Code being heard. I believe some of the TS-950's have the same well-known dilemma. The Carrier Board DDS ASIC's (YM66312 ??) go bad...

first thing you can do, is power the radio up, and measure the voltage at the PLL MB8719 IC1 at pin-9 "VDD" it should be over 8 volts. if this voltage is down to 5 to 7 volts and changing around, this is the problem. on my radio here it went down to 4.5 volts and the PLL failed.

https://www.worldwidedx.com/threads/help-needed-for-cobra-148-nw-st.164900/page-2 read that post. it is the blue wire from that little board as pictured. it goes to a 10 ohm resistor, to the main board. it needs to be changed to higher wattage. that resistor fails, and the voltage to the...

hey! hold on, hold on, before you destroy another..... I was "very quickly" given a nice looking but not working "D" radio about 2 years ago, after asking a local about getting a CB with SSB mode. . . first problem - no TX modulation, and also receive audio was scratchy. found that newer...

yes, older rigs! I like older transistorized radios. I have the Atlas 215x, and sometimes I check into some vintage radio nets. I power the RF power amplifier section and the rest of the radio in parallel with a regulated 13.8 VDC supply and use an old Cobra CB mic. I get signal reports...

on the TDA2003. pin-3 is common ground, and also common with the backside. no need to insulate. (usually, maybe) I was using these devices in modulators years ago. I would just bolt it to the chassis with a light coat of heatsink compound, since I designed it all for the chassis to be RF...

on your other SB-220, the problem could be in the switch contacts for the metering circuits. also, the band switch contacts go bad. For the local CB guy here, we took out the band switch and just have a 27 MHz output circuit. also, when Zener diode ZD1 is blown up, and either shorted out...

I was using and testing a SB-220 that I repaired from a local CBer, on 17 meters. It was sparking sometimes also, just like yours, so I did the following to stop this problem, as in any of these tube amplifiers: after tuning and peaking the Pi-network output, turn the load capacitor to a lower...

from the infineon.com post - "Pre-sale Counterfeit Verification" "Additionally, we do not support the sale of Infineon products via eBay or similar auction houses or any other below market source." https://www.infineon.com/cms/en/product/promopages/counterfeit-products/ "Infineon products...

over a year ago, this local CBer gave me this old Antron 99, that has been painted, and it suffers from "erectile dysfunction" as the thread is stripped up at the top section. I just slapped it up on at this 4 by 4 wood pillar from an old decking in my backyard, on a five-foot section of metal...

from the KIO Tech Hexbeam site. and I know people that did this. "Another approach is to wipe off the dust and use a spray can of Rust-oleum Universal which is a combination of primer and paint. It comes in flat black as well as other colors and a single coat is probably sufficient."

SuperLid, I noticed the Cubic Communications transmatch in that picture. I do repair work on the Astro 103 and 150.

. hey, TimmyTheTorch. I was trying to message you. I am trying to get my hands on more or these MOSFET RF output radios that people have thrashed on, and given up on repairing, so I can do some more tests n changes. Maybe get me a good repair customer base. I will send it back repaired. These...

my 5 cents worth (remember, todays inflation). I have a 142GTL that I got back on freq for SSB use. a "PI" made unit. date on the back.

yes, these amplifiers have "lame keying circuits." most of the amps I get, the RF key circuit is blown out, and has an attempt at repairing it. I put in a more robust circuit, that will not blow out.

I have a few of these 250's here. This RF key circuit has been messed with in both amps. One is keyed up all the time. I traced the diagram out and it makes little sense. So did this circuit ever work? AM and SSB? These amps seem to be OK. The transistors are biased, unlike many of these...

another thing on this radio set up. I got it after it was worked on before. It was blowing fuses. Regulator/mod transistor was all shorted out, and also found the short of a solder blob between solder joints at one of the IRF520's from drain to ground. I removed them 5.6 V zener diodes...

it is a "swing machine." that is because the meter on the radio is reacting to the positive going signal. so it shows swinging upward. but the overmodulated signal is also going to zero in the other direction. cutting off. going to no RF output. as in - "crank it up and whistle, then the...

Connex 3300HP Galaxy DX55HP circuit EPT360015C - I got my hands on a Connex 3300HP to repair. I see that many have problems with this radio, and all those other IRF520 MOSFET RF output section radios in general. - I only have worked on a few of these radios, to get them to work in SSB...