2.3GHz equipment
Status - QRV
3/3/07
I
have been QRV on the 13cm band since the mid 1970s, when I used a 150mW
multiplier transmitter to a 'coffee can' feed on a 75cm prime focus
dish. This system was only used portable from my Staffordshire hill-top
site.
Later I built a transverter system
based, as I recall, on a G8LMW PCB. The power amplifier was an EC157
(remember them?) triode at 1.5W output.
After my move to Suffolk the
system was updated to use a DD9DU transmit converter (150mW from a
BFR91A!). The LO is one of my DDK004 oscillators whilst the receiver
has variously been a connectorised mixer with early IC RF stage (RFM)
and printed filter.
The preamplifier is a DJ9BV two
stage design with about 36dB gain.
On transmit the transverter drives
a CFY10 based amplifier to 1.6W output. This, in turn, drives a
10W MGF0905 (x2) and then a 25W surplus PCS1900 Siemens bipolar
amplifier. I have an Ericsson RF MOS 200W amplifier and several 50W
drivers. The 200W amplifier has only been used for EME so far. That is
about to change.
The antenna is an 84 element quad
loop yagi made by G3JVL. This works extremely well.
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