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Not sure if anyone else has noticed anything similar, but here is an interesting observation. I have a cheap mfj travel paddle I was using to test the qsk and keyer functions. I'm using an end fed

While reading this thread, I am sure that many builders have wired their BITX-40's for dual voltages.? If you have, I would like to see a posting here on just how you accomplished it.? This would

Ah, that explains it all. Glad you found it, thanks for letting us know. And now... happy BitX-ing! 73 Allard PE1NWL

**SOLVED** Yep, it sure was a short between A0 and A1. A bit of sloppy soldering on the Arduino MCU. I could have sworn I checked earlier, but must have overlooked this tiny spot. Thanks again for all

Paul (call sign?) wrote... The post at /g/BITX20/message/23973 that Jerry pointed out pretty much says it all. Keep in mind that there are two places on the main circuit board that

audio preamp might be busted. the LM386 seems to be working (from the test that you performed). check the voltages around the audio preamp's base and collector. if the LM386 gives you noise, does the

Bump to top! -- John - WA2FZW

When I first set up the Bitx40, it did seem to receive OK. ?Then there began to be various, random “drop outs” into silence.? Cycling the power usually got it back.? Then one day it went dead

From what I can tell, everything checks out OK. Voltage on A0 attached through 10k resistor to regulator output is ~1.22v RX, 5v TX. Regulator pin 1 is 0v RX, 5v TX. Regulator pin 3 is 0v RX, 12v TX.

Check my photo album at the site, then. Jack, W8TEE To: [email protected] Sent: Sunday, October 1, 2017 1:59 PM Subject: Re: [BITX20] W8TEE pending software release and port(?) #w8tee Hi Jack, sorry

Allard, You are writing your firmware in such a way that users need not apply all mods. That might require a pullup or pulldown on A0, in which case it's best to ignore my previous post. If thresholds

Hi Jack, sorry but my feedback is the same... no ?inline picture on the side. I am even logged in. TNT fer all . sTef DM5TU es 72/3`s

Allard, What you have works well enough. But on the next rev of firmware, you might remove the pullup from A0. (As you are likely already planning to do.)

A0 should be approx 1.25V (LOW) during RX, 5V (HIGH) during TX. If this is not the case, first make sure that U3 is switching on and off correctly during RX/TX. U3 input pin 3 should be 12V during TX,

Yup, output of the 78L05 regulator should be zero volts when receiving, 5v when transmitting. It is powered from the TX rail of 12v, which is zero volts when receiving and 12v when transmitting Check

A0 and A1 both show 5v, PTT on and off. I don't have a key connected at the moment. I understand A1 is pulled low to send a carrier, but shouldn't A0 always be low until it sees 5v from the regulator?

What are the voltages on A0 and A1 if you measure them with a DVM? What voltages do you have when you press PPT or the CW key? 73 Allard PE1NWL

Thanks for getting back to me Allard. No shorts anywhere. I've done the reset and it does the same thing. There is nothing connected to the A1(KEY) wire. Do the CW Carrier and TX-RX connections need

I think that a release that uses the same BITX40 board mods as Allard would be useful. When the new hardware comes in you can then upgrade to new features. ? Bob? KD8CGH

Ah, seems I wasn't signed in, somehow. Now found the photo. Nicely implemented, Jack. Bill, VK7MX