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Microwave Modules
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Microwave Mods
Microwave Mods
Microwave Modules (Liverpool, UK) made a range of RF products for the Amateur and professional markets. I've got some of their power amplifiers in various states of repair.
Circuits (schematics) and manuals probably only exist on paper (if at all!) so I'll try and remember to add what I have to this page.
You might also want to check out the WW2R G4FRE website which has some MM manuals.
If you've sent me something in the past then thanks!
The stuff in no particular order.:
MML 144-100LS
MML 144-100LS
144MHz 100W out for 1 or 3W drive. Switched RX preamp. Thanks to Mike for the circuit. I had one of these for a while to use with a FT290R but I eventually sold it.
Circuit PDF
MML 144-30LS
MML 144-30LS
144MHz 30W out for 1 or 3W drive. Switched RX preamp. I bought one of these from an M1 station over the internet who assured me it was working. It wasn't. Caveat emptor. So I spent good money (38 Euros) on a MRF238 transistor and it now works. You can get RF devices from Barend Hendricksen for reasonable prices.
Now sold.
Thanks Keith for the circuit.
Circuit PDF
MML 432-100
MML 432-100
I don't have one of these but found the circuit whilst searching for information on a sick BNOS 432-10-100 amplifier. The RF line-up of both amplifier is similar.
MML uses a single MRF646 driving a pair of CM50-12A devices. Earlier versions used the CM50-12A as the driver stage. It has a regulated bias circuit, VSWR protection and thermal shutdown - more protection for the devices than the 144MHz amplifiers!
BNOS uses a single MRF648 driving a pair of MRF648's. It also has a more sophisticated bias and control circuitry.
Circuit PDF
Another disorganised production from Nick B.
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