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In the latest sketch version v1.10, frequency update is completely disabled while transmitting. To use this feature make sure you have the PTT SENSE line installed. See

I tried out a different microphone, but still receive poor audio reports.? My next step is to get a usb cord so I can update the sketch.

There are files on the bitx20smd at /g/BITX20/files/M0ZHN%20smdBITX ( /g/BITX20/files/M0ZHN%20smdBITX ) This was available about 6 years or so ago but now you would

As of Arduino 1.0.1, it is possible to enable the internal pullup resistors with the mode INPUT_PULLUP. Additionally, the INPUT mode explicitly disables the internal pullups. So the digitalWrite

You're welcome. The hand book can be a source of a lot of info. on contruction. I might aid that I'm planning on going that slightly heaver wire for power. WA9DOH PS I hope be on 7.179 there about at

Mike 4X1LM The original BITX20 is getting rather old. After several thousand posts there may not be much more to be said about that design. There are still kits available for BITX-xx transceivers,

Hi Jamie, I have not yet increased the voltage to the final amplifier. I was still building my case box and putting connectors on the thing. I purchased a 70 watt linear amplifier kit from China that

Larry, Thanks for your contribution to my education - appreciated. Thomas W Noel KF7RSF

*For what its's worth* Shielded wire from the DDS to the VFO input on the main PCB Shielded wire from the tune pot to the DDS RG174 from the PCB ant. to the SO239 or BNC (rg8X) When running the

My Bitx40 power connectionsPictorial diagram for the beginners out there. ?Sorry requires a facebook account to view.

There is a difference between "inexpensive" and "low-quality", although the two are often associated.

Evan, When you reach either end of the tuning pot you go into “shuttle mode” and will tune in larger increments. To stop it, simply reverse the direction of the pot. In your example had you

You could spend more than $59 on just a potentiometer. ?Compared to that, I suppose everything on the Bitx40 is low quality. ?That's why I got one. ?Haven't seen any complaints here about the pot

Is "unnecessary wear on the potentiometer" really a concern if that what's it's designed for?? Or does the kit come with low-quality components? At any rate, my bitx40 order is on its way, and I'm

Thanks for the support I have the very same question. -- Thanks de Hugh 2E0EHA

Hi Sorry for the delay in updating results. So couldn't find the 24v Ps I thought I had so I'm using 19v 4amp supply. I don't have a way of testing watts but I'm assuming with this voltage I'd be

The schematic on hfsigs.com ?for the Raduino shows that the Si5351 has 3.3v pullups on the two I2C lines into pins A4 (SDA, and Nano pin 8) and A5 (SCL, and Nano pin 9). ?You won't find those pins

Thanks for reminding Dragan! I have updated the instructions at https://github.com/amunters/bitx40/blob/master/operating%20instructions (

Not a bad idea, it could well help. ?Also shields around various parts of the main Bitx PC board, ?I don't think anybody here has yet tried it and reported the results. ?Most of us have adequate

This business of not connecting the ground braid on one end of a piece of coax came up in regard to tuning clicks from the Raduino. ?Some here felt that since multiple grounds from Bitx40 to Raduino