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Is there a concern for how the contacts are routed on the PC board so far as RF is concerned? What about the ability of the contacts to reliably switch relatively low level signals? John Brock WA8US

I have the exact same problem. I'm planning to upgrade too, so will be interested to see if that works for you. Will watch this thread.

Gilles? MY ubitx is also a V3. Don't forget the coupling capacitor on the filter output.. I had some very strange behavior in the audio of my Bitx 40 until I figured out that the output of the filter

my uBitx audio filter:? ? https://www.youtube.com/watch?v=v4_XrLQKBTU&t=28s

The desired signal at Q10 is always right around 45mhz. Has to be, or it won't go through the 45mhz crystal filter

Your tones aren’t balanced. Adjust the amplitude of one of your tones. They should cross over Regards Adrian

Tom— well, that 4 relay module certainly is cheap! And it looks like it has optically isolated controls of the relay coil’s. That would get around the coupling back through the coil’s. Probably

Jim, Your photo does not show a good two tone signal: the envelope should have a zero crossings. So either the two tones are not exactlx equal, or not equal amplified (ripple within the xtal filter!)

Using the RTL_SDR sounds interesting. I'd been concerned about audio delays even with using software audio filters/equalizers. Was running this by another local ham, and he suggested that some delay

G'day Joe......ok I think I figured out that the bootloader is installed with the nano328 version and so when I installed the new firmware that issue was resolved as well.? CW is now working on my

Congratulations Joe.? I have also now successfully downloaded and installed version 1.08 of the firmware.? I know what a bootloader is but not familiar with the Arduino IDE our how to use it to

Hi. I’ve been following and reading furiously since my purchase and construction of my v3 uBitx. It’s housed inside an aluminium case and is wired to use a baofeng remote speaker mic. Other than

Tom, you’re thinking right up my alley. I was also considering a RPi to handle digital modulation modes. But, I am also considering using it to run an RTL-SDR for all of the RX work and tap the

Hi!? FYI I have successfully obtained the technical certification of BITX40 by having added the modification to suppress of spurious of BITX40 from the relevant authority of telecommunication of

I like Gordon's add-on second set of relays idea and board.? Just wondering if something like this relay board might do an acceptable job for someone wanting something ready made. Would follow

anyone played around the Orange pi plus for ham project? can it control a dds or an SI ?? Paul 9H1FQ

typo in my previous post, for +39dBm should be Take a measurement of a? 10W? signal (+40dBm) It could be +39dBm = *7.9W* or +41dbM = 12.6W

Power output is notoriously difficult to measure.? To measure power out at one frequency, using an SA is probably the only way as you suggest. But then, the SA has a Spec for level, typically +-1dB

Also, too? single photo of rf output on load on 80 meters (two-tone test as above)

Spectrum of T11 for various bands ..Two-tone test (630 Hz and 2100 Hz) each 100 mV p/p ,,approx 550 ma. current draw on finals Jim