In article .com,
"ron_ayling" wrote:

Hi Chris
Thats a good point! its very heavy all steel construction so as you say
probably Land based, I have tried to GDO the front end coils, and get a
good dip on the RF and Osc coils around 38 mhz, The antenna coil I
can't find a dip although the coils look very similar in all three
stages, So what would a fairly high gain fairly fixed freq receiver be
doing on a military airfield during WW2 with a VR138 in it?

Radar receiver? The early stuff worked in the 20 - 50 MHz range, and
they might have used a fairly chunky valve as the RF input stage to
protect things from the substantial transmit pulses. Alternatively
it may just be the LO because it was a convenient triode that would
work at the desired frequencies (and the VR136 is the RF preamp).

By the way I noticed there is also a valve diode base in the front end
similar to an EA50 type I would think and another at the end of the IF
chain


AVC and detector? Dual AVC? If the IF strip is single coil, it's
probably wideband for pulse use... another clue to radar applications!

Best,
Chris.

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