[Boatanchors] RF Distribution Amplifier

[Barry Williams]

During WWII the british built radio intercept stations with a pair of
rhombics, one for 3-9 Mhz. and the other for 9-27 Mhz.  These fed up to 24
HRO receivers (also a lesser number of AR-88s and SX-28s).  In the
references I have, there is mention of a distribution amplifier.  I asked
one of the fellows who worked on them and he remembered that they were not
tuned and used type 807 "valves".  I wanted to build a similar distribution
amplifier for use with my HROs (a dozen or so).  Does anyone have a circuit
for something like this?  The input
impedence of the HRO was on the order or 300-600 ohms, although they seem to
work with a 50 ohm input pretty well.

I don't think the distribution amp had very much gain ( a couple of db or
less), so it was basically an input circuit matched for the rhombics and
capable of driving an impedence as low as 15 or so ohms, or as high as 300
ohms without much change in gain.

Thanks,
Barry
KD5VC