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I think Evan has it right. I hope Gerard has a Nano that is socketed to the Raduino, not soldered down like the early uBitx. As I recall from a few years ago, putting a finger on the resonator pulled

Evan, Thanks for the answer. It’s simple in fact, but handle the soldering iron well cdt

Gerard, Some more explanation may be required.? The ceramic resonator is the "crystal" equivalent that is used for the Nano clock.? There is not an adjustment to change that in the firmware.? The

Gerard, Here is an article on pulling crystal frequencies. https://www.electronics-notes.com/articles/electronic_components/quartz-crystal-xtal/crystal-resonator-frequency-pulling-trimming.php The

Many thanks to all of you for your very interesting posts; it took me some time to reply since there is a lot of QRL for me. I wll study each of the proposed solutions and I will perform some tests on

Jerry, You wrote: "push the 16mhz resonator over a few khz." Before change quartz, or other and for my personal information. I have tried several calibration, the 16 khz is always present. How you do

hello, on the other post, i have put that: Here, dunny load in a?converse box with linseed oil http://www.on6tn.be/Articles/Dummy_Load.pdf cdt

Most linseed oil is "boiled", which these days means it has chemical additives to make it polymerize faster. Those drying agents create some nasty noxious fumes, as well as causing the spontaneous

The python code of my previous post works, but the first SWR computation is rather silly. I started with a formula for SWR given forward and reverse power, computed?power from the voltages. Much

Attached is the schematic from https://ludens.cl/Electron/swr/swr.html Half of the transmitter's output voltage appears?between resistors R3 and R5. R1 and the antenna form the other half of the

Ah, sounds right. He might try moving the 16mhz resonator on his Nano instead of going to the bother of building a new filter. Jerry, KE7ER

What complaint is Gerard trying to fix? From this thread, I get the impression that he wants to move to an 11.059mhz IF so he can use newer firmware that was written for V5 and V6.

Curt, on another thread Gerard had found a 16khz signal on the audio output of his rig with the 12MHz SSB filter. I went back and did the same test on my v4 board and found the same thing. I then

I caution against use of linseed oil. Once oxidized it can sponteously combust. With heat added this becomes even more dangerous. At one time I coated my cedar deck with linseed oil on a hot day.

The discussion on dummy loads got me thinking of resistive SWR bridges. Would be good to include an SWR meter as part of a basic uBitx test set. Here's a resistive bridge that I like:

Gerard you won't notice much difference on receive if you move the xtal frequency.? this change is to reduce the transmit spurious on certain bands.? and these bands are higher in the spectrum, and

Motor oil is slightly acidic.. .you don’t want to use it. Sent: Sunday, November 1, 2020 5:18 PM To: [email protected] Subject: [BITX20] Dummy Load Resistors & Motor Oil Motor oil might be good for

If the SWR doesn't change much for your resistor(s) when you dunk them in the motor oil,?it should be fine.? ?Worth experimenting. My primary concern would be that motor oil is much more

Motor oil might be good for high temperatures but what are its electrical properties? I believe most motor oils have a corrosion inhibitor, a wear inhibitor and some kind of detergent. There are

Flash point is about 280F so smoke point would be lower… Sent: Sunday, November 1, 2020 4:37 PM To: [email protected] Subject: Re: [BITX20] Dummy Load Resistors Hello, That’s a great point. What is