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I found a Decca Aerial Testing Signal Generator
Type 1615 at a junk sale a few months ago. It's basically a xtal
osc/driver/PA transmitter for LF (Decca freqs 70-127 kHz). Very easily
converted for 136 because the o/p transformer is wide-band enough to cover 136
and needs no modifications. Plug about 100 mW 136 kHz RF into a xtal
socket and it will give out 20-25w RF into 72 ohms (PA is
2x807's). My old Marconi 2019 SG was quite adequate as signal source. Quite a
lot were made so there may be a few more appearing round the junk sales and
if you see one it's well worth £5 of
anyone's money!
Walter G3JKV.
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