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https://elektrotanya.com/midland_13-892_sch.pdf/download.html#dl I believe this radio is relay based and based on what you describe, most probably the relay is dirty or bad..heres the schematic, relay is at the bottom right..

Finally I got 10 watts CW with the autotune procedure but it didnt match the dummy load..I think I found why..the dummy load never screwed completely to the radio ant SO..so I decided to replace it..opening the bandpass board, I saw this very thin crack around the corner screw..the ground loop...

Removed the VCO2 top, adjusted TC1 to 5.64 volts, its now RX well at all bands! Was scared a lot, theres a continous alarm beep until TC1 is within operating specs..turn very slowly! just like adjusting a 148 1st gen VCO!

thks!! Got 0.7v at TP3 next to the VCO2 box..its supposed to have at least 4.0.. rechecked again at all bands, same thing 0.7v..funny thing is the radio was perfectly RX at all bands 2 hours before

The snakes head finally showed itself.. I hooked the radio to a new car battery.. Did the atu procedure, same thing warning beep..then I reset the radio with Power on and A=B..I had my DMM reading current, reads 1.32 RX..while I was selecting 10 meter band, I was hearing some chat, then it...

I was surprised this radio has a ATU..the model is a TS450S..it also has the SSB filter! that filters seems to be very rare and expensive, looking around the net..

also the 50 was pep, i guess it was 20 watts deadkey..

thks BJ..then Ill rig a car battery and a trickler..I do have a Tripplite 25 but its bad, loud sounding buzz and it cuts off, that buzz indicates bad transformer..i was thinking about using a 825 watt ATX PSU, but reading about using these psus for ham radio is not recommended .

havent disassembled yet..the rabbit hole goes deeper..this radio has the internal autotuner..just for curiosity I followed the user manual procedure to autotune and I hear the gears turning for around 7 seconds and then a long intermitent beep..I guess its the warning alarm..on my meter with a...

After studying the service manual, finally found connector 7 at the digital board..the connector supplies 8,5,14 volts and all are in spec.. So probably Im looking at a bad inverter.. would a LED strip work in place of the cathode tube?

thank you sir!

Hi..do you happen to have one for Realistic TRC-451?

Nomad, heres a screenshot of the circuit..I cant find the PIN 1 and 2 where 8v and 2v are..I do see the tiny inverter and the CFL and usually thats a tiny AC line bulb..

oh upto now, the VFO knob is working perfectly..all buttons are working too..so I guess the DSP is working ok.. I dealt with similar display problems with hifi recievers..the flourecent circuit is always a small 5 volt AC line tapped to the transformer..almost always that line goes 12 volts and...

thks! hmm this will be a tough one..kind of scared to crack it open lol.. Ill dl the service manual and lets see If its doable..

I got this radio for a trade.. TX and RX are ok.. But it has a weird problem. the display overbrightens, lighting a bit segments that are not in use..its like the backlight is too strong.. is this like that or is there a way to correct this?

I use the TinySA as a sig generator for aligning CBs..works great at that..but, I dont know why, it never detects a AM carrier correctly, its always like 6k off compared to a SDA tranceiver..I have calibrated it several times with the self cal test..I also wrote about it at the Tinysa forum, not...

what? nooo..How do I lower dead key? these fets are hard to get!

tks Kop..is was very useful..is 6 watts AM at 20 m ok?

on my bench..the mosfets are replaced and upto now its TX per specs..But I was itching to measure voltage but didnt dare to..usually these radios are calibrated by measuring current draw at the DC..anybody would happen to know voltages on the fets?