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I previously made the FLDGI CW keying circuit, and it works great. But better than that is using the rig controls for serial port PTT. Tests with the relay module and the Usb to serial adapter

You're probably right. So Matt's TX rail probably never saw power during the mishap, and none of those parts behind it got damaged. We're assuming it was a battery lead reversal that blew D7.

N9ARZ was 59 here in Coralville, IA but didn't hear me. Maybe next time. John AD0RW

The relays are polarized type, they have a magnet inside to reduce operating current. They wont operate with reversed voltage.

I have put preliminary information on my cheap Mcufriend 2.4" TFT based VFO/BFO with touch controls at vu2spf.blogspot.com More pictures and program to follow. Soon I will be uploading its video too.

I had a QSO with Don ND6T in California about half an hour early... my first one with someone using a BITX40! I'm still waiting for my BITX40, so I was running 100W. Don was fairly weak... about 43. I

Reverse polarity protection is a must. I have always put a diode in my designs. Does not cost much. First thing I did before powering up the BITX40! Raj

Please see the link given below http://www.g4ilo.com/usblink.html Thank you 73 Ameer Khan VU3SQM [email protected]> wrote:

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