On the air QSO with my Radioberry TRX | Raspberry Pi 4 | LPF and Output tests on a Tektronix 495P SA

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On the air QSO with my Radioberry TRX. I started this project last November (2023). Progress was slow because of other commitments. I completed it (well, almost) yesterday. Power output was measured using a Tektronix 495P Spectrum analyzer and a LP-100A power/swr meter.
The QRP amp uses a push-pull pair of IRF530 MOSFETs.
LPF, TX/RX relay change-over, and PWR/SWR sensing are all on a single board cannibalized from a Yaesu FT-757GX HF 100W rig.
This is a 10/15/17/20/30/40/60/80/160m all Band, all Mode HF SDR QRP Transceiver using a Radioberry hat - by Johan, PA3GSB on the Raspberry Pi 4B running PihpSDR software/app by John Melton, G0ORX.
This is a step-up from the popular uSDX+ SOFTWARE DEFINED RADIO.
Probably a step lower than the Hermes Lite-2, because it's still a half-radio. LPF, TR relay switching, and PA are now in place making this a complete Transceiver.
#arduino
#wb2cba
#pa3gsb
#dl2man
#radiojuice
#ad9866
#pihpsdr
#g0orx
#vu2xto
#vu2dle
#vu2dgr
#hermeslite-2
#Hermes
#Radioberry_Console
#acom1500
#furuno
#lp-100a

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Опубликовано:

27 июл 2024

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Комментарии : 8

@ScatManAust 4 месяца назад

Very nice and something I am going to do myself. I am going to use the PA and FB out of an old IC-725, well that's the idea at least. But I am trying the Radioberry now for about two weeks now without success. I just can't seem the get the software setup. I am going round in circles trying to get it working.

@PremMenon 4 месяца назад

Thanks for your message. Yes, if you have a donor IC-725, output stage is taken care of. Even I went in circles for a while, and then succeeded. I'm sure you will figure it out too. GL and 73.

@arashz5657 4 месяца назад

hi, prem. something I didn't get ! how do you select and control the LPF for each band ? what I see is that wires of LPF go to the radioberry controller board and each band is selected by Pi Pico but the relays are 12v . by the way did manage to install your radioberry controller on on new Pi OS 6.6 or is it all based on 6.1. nice work and well done

@PremMenon 4 месяца назад

Hello Arash, thanks for your message. Mine is the old one. Started the project in Oct/Nov 2023....so, same image. Regarding the 12V relays, it's not an issue. 12V is a common connection to all the LPF relays and the required relay pairs are grouped (negatives are wired together). The required band relays' negative gets grounded by the controller thus selecting the band.

@heinerrambold8889 3 месяца назад

Do you go directly from the antenna to the radioberries rx input? Or do you use some bandpass filters or preamps? Thanks for the video Prem!

@PremMenon 3 месяца назад

Hello Heiner, thanks for your message. Essentially, the Rx port of Radioberry goes to the antenna directly although there's an antenna change over relay in-between.... because I'm using the NC contact of that relay for Rx (the usual practice). I didn't feel the need for any filtering for Rx frontend. Rx is as good (better, in fact) as most commercial rigs I own. 73.

@heinerrambold8889 3 месяца назад

@@PremMenon Guess, I will also do without any filtering as my antennas are small bandwidth and thus prevent overloading. Will probably only use the rx part for the time being. Congrats on that fine gorgeous looking vfo in the sturdy metal case Prem!!!

@PremMenon 3 месяца назад

@@heinerrambold8889 Thank you, Heiner! My best wishes to you. It's just like straight into a doubly-balanced diode-ring mixer front end - as used in many homebrew rigs and some commercial rigs as well. Overloading should not be a concern. I keep the RF gain at around 5 or 6....and reduce as needed. I'm happy you checked out my ESP32 VFO I made for my army man-pack.