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Mine did that, too, because the current draw was too much for the PS, and the PS turned itself off and back and on.? That can happen (at least in my case) on lower bands with a bad antenna mismatch.

Sadly based on the data sheet I got some MPSH10s and as reported they didn't perform as expected. The devices I found worked better for me are: 2n2222A(to18), I tried PN2222 and they?produced less

You might want to check the power supply too. If something in it died, you might be getting ac on the power lead which could cause this symptom.

Mucking with RV1 could easily and quickly blow the IRF510. Whenever adjusting RV1 (the IRF510 gate bias voltage), you should be monitoring? the drain current into the IRF510 (12v into PA-PWR1) with

Yes, low output when speaking or whistling into mic. Power wiring correct AFAIK. RV 1 set at about 30% on arrival.? Adjusting to full CCW raises draw to about 1.6 A on PTT, with no change when using

Hi, I am not Mr Farhan, am just a user and an advanced qrm maker. As for ' Problems: great carrier in SSB mode TX, more then modulation speech signal!' I believe you should move up or down the BFO as

You might try Allard's mod to transmit CW, drive the top of C107 from 5v through a 4.7k resistor: ? ??https://github.com/amunters/bitx40/blob/master/CW-CARRIER%20wiring.png If that gives power to

Is the low output with you talking into the mic? The carrier is suppressed in SSB as you know and almost no output is expected without modulation. I had a mic go bad on mine after a month.? ?Found a

R136 with Bitx40! 1: Power connector all wires connected properly ? 2: RV1 at center ?

1: Power connector all wires connected properly ? 2: RV1 at center ?

Thank you for quick reply. Re-checked soldered correctly, and confirmed continuity to board connector.

Al, check the electret condenser mic element soldering. Polarity is important. Raj

Just finished wiring my bitx40.? Draws ~350ma with PTT, but no change at all when yelling or whistling into mic.? (Dummy load present at all times, so don't suspect final blown.) I see lots of

That strap could cut Q90-base out of the circuit too, in case that causes RX spurs. Probably OK to leave the back-to-back diodes in there near Q90-base (to the left of C80) during transmit, as I doubt

Check voltage at R104, should be 0v. Sounds like CW is on!

I have a ubitx v4 it was workign fine on my 12v 3 amp power brick all fo a sudden whip transmitting the unit shut off and cam back on. Now the reciever is working fine but when I transmit I het a loud

That would make for a very useful experiment! If you try it, let us know what you find out! It’s possible that different transistors have different reverse (base-emitter) break down voltages, which

Yes, I followed the instructions on the blog and the video. The values that should have been reported by the manager are not the expected results

Dear Mr Farhan As about me for several days I was asking for help as I've lost the original soft for scale and control of the Si5351. At last I've? find HEX file by KD8CEC and I am happy that it

I didn't see pics of this in the site, so I thought I'd share mine. Continuity tests all look good. But, man tombstoning those surface mounts was hard! I Now understand why there was a REV 3. :-)