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John, this looks really cool. Like yourself, I have a limited amount of real estate here to play with. I have the mfj mag loop, and even though it is only 3 feet across, single turn, I have had

Complied and loaded fine once I added the DigitalWriterFast library. Screen has a gap on the right side but I'll fix that. You surprised me with the RTC. Gotta get one of them. don

Don't do what I did. I thought it would be good to put a capacitor across the function? button? to keep any potential stray RF across off the line. I grabbed a .02mfd from the junk box...figured it

I have uploaded 2 new files to the group page a magnetic loop antenna that I built to go with my BitX-40!?It's a 2 turn 4' loop for 40 meters. One file contains the software for the tuning controller

Hello, I am giving a presentation to my QRP club this Saturday about the BitX40 and wondered if someone had or could point me to a block diagram of the BiTx40.?? Thanks for your help. 73, Dale?

Ken KG6PO wrote.. If the LM386 and the volume control check out OK, perhaps you could check out the relay connection between M1 & M2. On the drawing, the relay contacts are down in the lower right

OK Everyone, thanks. ?I'll go back to bench with these pointers. Ken, KG6PO

All: I have uploaded the new software for the BITX40 color TFT display and VFO PCB. The new release fixes a number of bugs, especially in the display and the processing of the encoder. Users should

Glad to hear that report! I put a lot of time into that antenna! Very happy to see that it actually works! I plan to publish the plans and software here and on the Yahoo MagLoop group as soon as I

Ok, I’ll give these suggestions a try and see what happens. Thanks!

Similar to what Jerry suggested I connected my KX3 to 50 ohm dummy load that I had built into an Altoids box. I opened the box to let a bit of RF leak and connected a jumper wire to the BIX40 antenna

I worked John WA2FZW.? ?He was on a BITX40 to a mag loop.? Sounded good!? ?Then the dinner bell rang.? Then "60 Minutes"...73 Bill N2CQR

Hi with a little patience you can easily make your own step attenuators. The one in the first link can attenuate signals up to 80dBs The one in the second link one can attenuate signals up to 71dBs

Your signal generator is -10dBm, and an S9 signal is -73dBm. So to make it so the signal generator sounds like an S9 signal you need 63dB of attenuation. Stacking 3 of those 20dB attenuators would

My first BITX40 #66 the volume control failed. The failure happened when I resoldered one lead that came off. The plating quality is not good IMHO. Check the DC voltage on LM386 pin 6. The

NJ ? -- John - WA2FZW

Dexter, It went dead over time. Looks like the horrible volume control have up the ghost. - f

... or wired AAF (Kiwi slang, arse-about-face). Measure your pot wiper-to-each-end. Rotate shaft to 'minimum' as though (or if, then as) mounted in panel. Now which end measures 0 ohms? That's the end

I would imagine the vol control is suspect at this time... - f

Hi guys, I’ve been tied up for a few days and just been able to revisit my original post. I have a 50 ohm 20db attenuator. If I run my RigExpert analyzer into the attenuator and then the attenuator