Last call for group buy of F6BVA QO-100 system PCBs etc

Neil Smith G4DBN

As previously mentioned, I'm doing a group buy of PCB sets for the F6BVA QO-100 up/down converter and MW7ic2725 PA.

This version of Michel's design is about making a simple standalone unit for use over QO-100 without needing a computer or SDR dongle, and without tying up the TX side of a 13cm transverter. Ideal for a go-box with a 2m/70cm SSB rig and POTY-equipped dish.

There is already enough interest to do a group purchase of the components. I will be providing some English-language construction notes. The set of two PCBs is likely to cost around £40, perhaps a little less if demand is high enough. Not sure of component cost yet, but the Minicircuits mixer at £13 and MW7ic2725 at £50-ish are the only expensive bits.

You'll need a local osc with two selectable frequencies. An SV1AFN or even a Chinese ADF4350/51 would be good enough for QO-100 usage.

Sorry there isn't a converter-only option as the economics of fancy SHF laminates and finishes mean we have to buy both boards, but you may be able to find a home for the PA PCB if you don't need it.

For clarity, the older version was full-duplex, but this V3 is designed to work with a simple half-duplex transceiver.  On 2m, you can use a DF9NP LO using one of the control pins, but for the other bands (and also 2m) you can use an SV1AFN or Chinese ADF4351 with a tx/rx changeover flipping the frequency via a pin on the controller. I'll be using an SV1AFN board. Not decided about the controller yet, might just use an 8-pin PIC and PSU and TCXO on board, but that would just be reinventing the SV1AFN controller. We'll be supporting this through the IO group at which you are welcome to join.

If you are interested, have a look at the document (in French) at

If you'd like to join a group purchase of the PCBs, with optional tin box, milled aluminium PA box and full or part component set, please email me direct to with title QO100 so I don't miss the message!

I'll be finalising the order to send to Pierre-François in the next day or two, but the ultimate cut-off will be when he submits the order to the pcb fab. I don't expect there will be a second tranche.

Neil G4DBN

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