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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. :-)

Kevin If you search on miklor.com you will find the wiring diagram for the Baofeng speaker/mic. You will need to modify the mic to work with the uBITx (but not the BITX40 or BITX20) because the T/R

Some fake RD16HHF turned out to be IRF510 on my tester. The pin orientation was IRF and so was capacitance. They worked fine in my B40 boards. Raj

I just tried these in mine too for pre-driver and drivers. <5w output.... I had some 2n5109 turn up today so will put them in tonight. One under the board one on top. as flat as I can get them... The

Farhan jee the "c" mark on the right of Logo indicates that devices are fake.If IRF530 re labelled as indicated that they are fake. I had a bunch of therm. If some one doen't check under item details