Full Racks!

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December 2018

I will now try to do a round-up of 2018 on a single page! As you can see, both my 19” racks are now full, with the left one overflowing into a 4U cabinet on top! The problematic ProSisTel rotator has been replaced with a Yaesu G1000DXC. Such has been the demand this year for my restoration and refurbishment services that I still haven’t written new software to control my WJ-8712. Nor have I found the time to find out what is wrong with my 13cm yagi which exhibited a problem immediately after moving the shack and thus extending the feeder a year ago! I did manage to resurrect the RA98 (in the 4U rack). The 18KHz oscillator had failed. Actually the glass envelope is largely missing, thus the dual quartz element is exposed to the atmosphere and this may be partly to blame. However I found recently that reducing the value of the anode resistor (normally 1M-ohm) to 470K gave the circuit a bit of a ‘kick’ and the RA98 is now running very nicely! Back in May I was VERY fortunate to pick up a car-load of Racal 3700-series kit, comprising Receivers, Drive Units, Linear Amplifiers, and Power Combiners. I also inherited a Collins R-390 and invested in an SDR-Play RSP1A.

Left-hand Rack

RA98 ISB Adapter

MA259 - Reference Oscillator

RA218 - ISB Adapter

RA117 - Linked to RA218

RA137A - LF Adapter

RA17L - Linked to RA137A

RA117E - Linked to RA98

RA17 - A MK1

MA197 -  Preselector
Right-hand Rack

Rapco 1804PS
RA3712 - Dual HF Receiver

RA3701 - HF Receiver

RA1792 - HF Receiver

RA1778 - HF Receiver

RA1772 - HF Receiver
RA1217 - HF Receiver

R-390 - HF Receiver

MA3752 - Dual HF Drive Unit

TA3762 - 250W HF PA

40V/50A PSU