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Listening right now and 7.178 MHz is better, or even better 7.1775MHz. There is a strong station working on 7.180MHz and another one on 7.175MHz -- Ion VA3NOI

Measure that tuning voltage (to ground) going into the Raduino as you rotate that pot through its range. ?Voltage should smoothly change from 0 to 5 volts.

Hi Jerry, thanks for reply. Well, it is a little bit tricky to explain. I'm sure that both 10k lin and 20k 10-turn are good, both wired properly. Sketch was also good, Allard's 1.10. I cannot

With PTT pressed and key not closed, this is like an SSB transmitter with no audio. ?There will be some residual carrier, since that balanced modulator is not perfectly balanced. ?I doubt this

I don't fully understand the symptoms you describe, but: Those 10 turn pots can have funny pinouts. ?I'd take it out of the circuit, check with an ohmmeter. ?Make sure you have identified the

I tested most of the features of v1.10. This is what I did: 1. All toggles works fine. 2. Installed 20k 10-turn pot (the only kind of 10-turns I had ATM), it looks much better than 10k lin. It

Alternatively you can use: pinMode(FBUTTON, INPUT_PULLUP) and eliminate the digitalWrite line. Mike K5ESS Sent: Sunday, May 14, 2017 10:00 AM To: [email protected] Subject: Re: [BITX20]

Larry & Gerry, I've added your posts to the wiki under the modifications / improvements / hacks section. -- 73 de Noel, ZL1NC

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