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After weeks of trying I finally had some success! First QSO with Rick WB0NPM then Don ND6T. I also hear a few others but can't make them out. Rick mentioned an early net 8AM on 7186, may give that a

I had one that looked similar to your Ebay post and it didn't have any isolation between the computer ground and the audio in and out ground. I did the VOX interface as well. I intend my Bitx to be

I have worked with a lot of cheapy ones from aliexpress they wont have any isolation. I use a vox interface just for that. It does add more cables to the mess but it works. Gl 73 David N8DAH

Does anyone know if those cheap Usb sound card adapters offer any isolation between PC and radio? I plan to try out these things with my isolated interface for digital modes. The plan is to use an Usb

I heard KD9CYF calling several times. I did not get a response.

No joy here. ?Lots of noise.? Doug? KD9CYF

HAHAH - one of my two QSOs was you!

It were noisy. I, too, was late to the party - around 7:45 CDT. I caught two:? KG5KYJ - SIG 58 or so, BitX to BitX QSO! about 00:45 GMT KF4WBJ - SIG 54 - could be incorrect, but I *think* that was

I heard KG5KYJ in MI but you did not hear me.

OK, that last post does overstate it a bit. Dropout through an LM2940* is not zero, it's around 0.130mv at the 150ma draw of the Bitx40 (excluding the IRF510) With schottky power diodes, drop through

With the bridge rectifier, you have two unnecessary diode drops. ?So a 12v battery might only deliver 10.5 volts or so to the rig. The diode and fuse trick avoids the voltage drop, but is a rather

Count me in on 2 please Regards martin VK6FEEE

Well, I am late to the party but I was listening on 7.277 an came running to receive QRM on 7.276. Did we ever agree on a secondary? And I just heard W1LY LOUD and CLEAR trying to contact the QRM in

I looked at figure 15 of the LM340 datasheet, the "shorted input protection diode" is in parallel with the regulator, not in series with it. The diode addresses a weakness of the LM340: ?if the input

It appears the way you have wired it may be causing a double paraphrase short in the transgronifier. I would suggest a dual direction high Mu diode to enable a neutron acceleration lane. v/r Fred

Even better go through a fuse and have a standard diode between the fuse output and ground. If reversed the diode causes the fuse to blow. Another cure is to feed the input to a bridge rectifier and

From post?/g/BITX20/message/27483 ( /g/BITX20/message/27483 ) That last line should be all you really need to know. Looking at the schematics, the end result is that

Hi Bill, I have a stock Bitx 40 waiting for me to get back into the shack to mod. My other hobbies are taking my time ... well that and work :-) I also have one of Jacks boards and ordered an other

I've tried several old versions here on my own BitX40, but I could'nt reproduce your findings. I can't hear any noticable difference with regards to the tuning clicks or noise from the Raduino. So I'm

All you would need is a good ear. Tune in an SSB station, then fiddle with the new trimmer and the regular tuning control for best sounding audio. ?That best sounding audio will also show up in your