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The BAV21 is not a bad choice for the dummy load dectector. Very cheap, which is of course my primary criteria. Forward voltage drop appears to be around 0.5v at 0.1ma from their graphs, the detector

The 70v reverse max spec on the 1n5711 need not limit the power you can measure. Just add a resistive voltage divider to reduce the voltage that the 1n5711 sees. For example, add a 900 and a 100 ohm

We use a BAV21 diode in our design, which is rated at 250V. Jack, W8TEE

You guys whining about doing mods to your Bitx radios amaze me. When I bought my Collins (KWS-1 & 74A-4 and still have them) the manuals came with all the mods the factory said should be done and that

Hi Kees: Thanks for doing a great job on the pop fix and AGC. Please send the link to the photos. 73, Alan N4AYE

True, there's nothing new about the design and something very similar appeared in Arduino Projects for Amateur Radio. About the only twist is the addition of the small OLED display. Jack, W8TEE

ok thanks Vince i can make,i think to exist others solutions!!!:-)

Same idea for qrp dummy load. Easy to add a diode and cap for voltage measurement and power calculation.

The $10 qrpguys dummy load looks good, about what Allison was suggesting except that? they include a cap across the meter leads, Allison's scheme assumes the meter itself provides the needed

Ashhar, Thank you for producing the uBitx! After reading this thread I can’t help but think that some folks will complain about a free meal. The rig is described and marketed correctly. It has some

Hi, I don't believe HFSignals is responsible for the post office's shoddy handling of packages entrusted to them. So lets just submit the proper insurance claim to the post office and get on with our

A string of fast dits. I hear people tuning that way all the time, both their amps and antennas. Still keeps you at a 50% duty cycle. On the B40 I had a low power mode for tuning with a pot to vary

Thanks for sharing the info, it certainly will be helpfull! However I am wandering about switching between phone and sigital modes without unplugging speakers and microphone.

Kees, i received the envelope and also a return of the apparently too much paid amount. I gratefully thank you for that but also for your great initiative and the team spirit! Fotis de SY3BUB

just for tune entenna with a padle is not possibble, and use microphone is not easy, is there a solution? thank for answer

I just made my first CW contact with my uBITX!? Up until now I have been hesitant to try it because the click/pop was disruptive, but I built and installed the K5BCQ/VA7AT/ND6T click fix kit and now

The dummy load looks identical to the one K4EAA describes on his website. His has a couple of diodes to output the voltage from the load. Power can be calculated by measuring the output voltage. Ray

Here's what I did /g/BITX20/wiki/Digital-Setup -- www.bitxmap.com ( http://www.bitxmap.com )

I built up Allison's (KB1GMX) anti-pop circuit on a small piece of single-sided copper-clad board, using Manhattan building techniques and MEPADS ( www.qrpme.com ( http://www.qrpme.com ) )? and I

I want to add the digital modes to my uBitx. Before I reinvent the wheel, I would like to know how to go about connecting the audio in an output to the uBitx. Do I put a relay or multi-pole switch can