This is a 10GHz Narrowband transverter using modules designed in the early 1990s by G3WDG and G4DDK. Kits were originally made available from the RSGB Microwave Committee Components Service. The control module was designed by G4JNT and the regulator boards by G4FRE.
My progress in constructing these modules has been almost non-existant over the years! I now intend to get back to constructing them so I end up with a breadboard/prototype 10GHz station from which I can gain experiance. If all goes well I will progress to a more modern design based on a DB6NT transverter.
To avoid damage by static charges I will not fit FET devices in the RF modules until the boxes are secured onto a baseplate and I am ready to test them.
|At last I have started to fix the modules into a weatherproof box: All the RF interconnections are made. I will probably build & add the 1W module later.|
|G3WDG002, 144MHz to 10GHz Receive Converter.|
|Visible are 2 cavity filters and a G4FRE regulator.|
|G3WDG003, 144MHz to 10GHz TX Converter.|
|Showing the regulator board and the 4 cavity filters.||There is a preset pot for setting the DC on each FET|
|G4DDK004, 2.5GHz Local Oscillator/Multiplier.
(See RadCom August 1990)
|The 8 'Sky' trimmers for filter alignment are clearly visible. On the far left is the crystal covered by a heater (a Murata Posistor) that is not yet connected to the feed-throughs. This module is aligned and working.|
|G3WDG004, 10GHz Receive HEMT LNA.||G3WDG006, 10GHz 250mW PA.|
|The SMT power supply is on the other side of the board.||This is the SMT power supply board fitted under the 250mW PA.|
|G4JNT001, Control Unit.|
|Transmit-Receive sequencer & relay driver
2m TX dummy load
2m attenuator & drive level set
RX (2m IF) attenuator.