Search results

update! the silkscreen placement sign on the board is wrong..its flipped..so switched the TR and now I get meanful voltage although not the SM values..getting 1.3 base, 8.3 collector and 0.62 emmiter, TX AM mode ch 5...test point for driver and final currents are not showing anything but I do...

The Emperors are on hold until I get new drivers and finals.. Im working with a TRC451 which was given to me and it was really messed up..so far I have fixed the RX section pretty much accurate possible with no osc, just a sdr and a TinySa as a signal generator.. this radio has a missing choke...

well the saga goes on..the 1945 is fake too lol..wasnt getting power..installed that to a tester midland no dice either..so just out of curiosity I installed a 1237 to the Emp and got 2 watts right off the bat..But current at the test point kept rising also from 0.25 to 1.7 and rising..I know...

I see..I wonder what would happen long term with R258( 330ohm) at the NFB..mine was open, I had to use a 380 ohm because I dont have a 330 at hand right now..

also replaced the trim pots for new ones..I guess that did the trick..thks Nomad!

Bob, Ill let you know when I get the other 5010 fixed.. Nomad, thanks a lot..and also to Sp5st.. As suggested by Sp5t, I used a 1306 pulled from a Cobra, since the 2166 that was installed mostly its fake..so far I got a stable 50ma with the 1306, (0.900 amp at the DC connector)..also you see...

got this resolved..retuned a vr at the pll board..nice stable modulated signal at the collector of the driver.. But doesnt reach 50ma at the test points..its or very low or very high.. getting tired of this radio..

will do and let you know..thks!

may a 1306 pulled from a Midland work ok? its tested good on my dmm

I have a TRC 449 that has the same test points bridge..thinking about comparing current idle and activity at the test points, to see if both act similar

could be..although it was bought from a shop, not online.. In case I get a genuine, and it happens again, what should be checked? there was a bit burned 100 ohm bias resistor, and I replaced it for a new one

Hi.. I installed only the driver 2166 which is new, and tested current on the test points..it goes from 0.30 to 1.3 and I stopped there, was getting to hot...all trimpots are adjusted accordingly by the service manual..any suggestions?

also came out as a Universe 5500 for southpacific..with the upd 858 same one as the Palomar.. those light brown with white upper silkscreens are typical from Malaysian fabs, where usually components were installed by hand..around the 80's..it might be that Korea commisioned those boards at...

when will a cb get a proper IF filter control?

Korea (Designed by Dynamation Int'l, Baton Rouge, USA

Good afternoon..Ive been using a chinese sdr radio with a short AV line and a 101k cap..it this safe or what would you recommend me? its sniffs TX signals ok but doesnt pickup IF like a 17mhz RX crystal signal at test points..I also have a TinySa but I only use it as a signal generator, becuase...

please see here so you can see what I mean..at this point where the cap is, normally a good cb radio will output a very weak but very stable signal..this one is not stable at all

Im currently testing a 5010..it doesnt barely TX so I removed final and driver..I measured voltage at the driver base and its not stable, jumps around from 0 to 8v..traced backed to the predriver, removed it and same thing at the base pad..I furthered down to the 2 transistors right before the 3...

replaced the TDA7502P and related caps, no change .what really worries me is the squelch problem..if I turn CW to around 1/4, a huge feedback squeal..if I continue, the squeal goes down, but still there and doesnt squelch RX noise..I removed a 373 transistor and that disabled squelch control, no...

Hi all.. Due to the lack of MRF477, Im reading that the 1945 is a drop in substitute.. Is there anything to adjust on a hr2600? thks!