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yep, seen this before. I have an AL-811H. but a friend sent me some old used Russian 811's, and they are holding up.

yes, measured just about 2.2 V from MIC 3 to negative. when keyed up it goes to ground. should not mess up the 8.4 V line, or radio would not work. I keep my display on BRT. when changing to DIM and NOR the meter lamp does not change much, but the channel LEDs get dimmer. and no...

and one more thing.. if the same China board. since you are already inside soldering on this board. another known failure point, from what I have read, and this happened to this radio I now own. Resistor R130 to the PLL IC. it needs to be changed to a bigger wattage, a half watt is good...

made in China radio? the only number I have on this board is: . . and the schematic -----

. been reading this post. I have my China made 148 here that had a few things done to it before it was given to me. It works great now. Looks like this same main board as you are working on. So, I just took the covers off to do some comparisons. looks like, by the different soldering...

listen to 6850 kHz AM at nights. Liquid Radio is there, with 10 watts of carrier. homebrew transmitter. heard around the SE and East coast U.S.A. He is on the air right now! ! ! !

with the "HP" it may be one of them transmitter outputs with two IRF520's in parallel, and draws lots of current, and the series modulation transistor gets very hot, 0015 board.

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.