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The webpage Gerard pointed to keeps things simple by ignoring phase. The L network example on that webpage assumes purely resistive input and output impedances. Gerard's filter module of 1500 Ohms

In the general case

The calculation is simple, but the concept of impedance is not always easy. Few radio amateurs without an engineering background ever figure this stuff out completely. Impedance is like resistance,

The IF amps and associated DBMs were 50 ohm not 500 ohms. The TIA amp is 50 ohms and the DBM is also 50 ohms. The actual network is L network and the calculation is simple. Note C250 and 216 are not

*Re, * It’s never too late to learn... I think this site Impedance Matching Filter Circuit Design – LC, L and PI Filters (circuitdigest.com) (

I sent the files to a friend of mine what has a 3D printer and he said that it was warping and wasn't printing for him. Would someone out there be willing to print me a case or is there a company that

Ugg...memories of circuit analysis in college have assaulted my brain! I bet a computer can get the answers faster than me. Gotta get back to changing my tractor tire...enjoy. Scotty WD4PYT

Hello, In the Ubitx V6 documentation, it is noted that the 45 Mhz filter must see an impedance of 500 Ohm on each side. See on uBITX V6 – HF SIGNALS ( https://www.hfsignals.com/index.php/ubitx-v6/

AE9J, The hw_settings.ini file is in the data folder in the sbitx folder /home/pi/sbitx/data I suggest copying the entire folder as your customization settings and the log file are also stored

So where is this "hw_settings.ini" file? Does this file get changed by the "txcal" command? I guess I should copy that file off somewhere before I even think about changing it. Thanks.

Agreed! Also, I found the following on the sbitx group on Facebook that I think will be of interest to POTA operators: https://www.printables.com/model/819428-raspberry-pi-screen-sun-shade Thanks

And complementing this solution, I also remove the fake-hwclock ugly workaroung, that is installed by default: |apt-get remove fake-hwclock| Cheers, Rafael

It is just a matter of loading the appropriate overlay to make Linux use the installed RTC as system RTC. I use: |dtoverlay=i2c-rtc-gpio,ds1307,bus=2,i2c_gpio_sda=13,i2c_gpio_scl=6 | Then wipe the

JJ, If the address of the RTC? is 68 without the sBitx program running, you should be able to sync the RTC to the Pi. That doesn't look like the RTC address. -- Jerry Ponko, AC9NM

I wish that the sBitx had used the standard I2C overlays instead of bit-banging. Back when the sBitx first appeared, I was not convinced that the WM8731 codec and the Si5351A could not work together

Thanks for the link, Jon. This is really good info. I started to play around with some of the commands and may go further to see if I can use it in the 64bit build. This is a good way to test the RTC

Does this adafruit article bring any useful information? https://learn.adafruit.com/adding-a-real-time-clock-to-raspberry-pi Seems that this is the same / similar implimentation.

Hi Gyula, according to the info at "sbitx.net", the RTC is only accessible via the sbitx program.? Have a read here : Syncing the Real time clock – sBitx.net (

Good job JJ and Jerry, many thanks for your ongoing work with this amazing little rig. I have applied the update to your 64bit beta2 version JJ, and can confirm that it works, and to quote you: "This

I am with Evan here and would just buy a sBitx. I am having a lot of fun enhancing and extending KD8CEC for picos and teensy, ?but after buying my own sBitx, I don’t see my work ever catching up