Dear LF enthusiast,
nice to see that the reflector is back on again!
We had a nice Dutch/German LF meeting during the Dortmund rally last
Saturday, consisting of Wil, PA0BWL, Wolf, DL4YHF (the operator of DF0WD),
Ruediger, DK6JL, Hellmuth, DF7VX (the VHF/UHF manager of the DARC ...) and
myself.
On the fleemarket I got hold of an SSB exciter made by Hagenuk, called
EX-1001. This exciter delivers CW/LSB/USB from 0.1 to 30 MHz in 100 Hz
steps, so it is the ideal unit for BPSK/PSK31/HELL/FAX and similar
experiments on LF that require linear modulation.
The unit is supposed to deliver about 100 mW (7 Volts peak-to-peak@50 Ohm)
from 400 kHz onwards, on 136 kHz unfortunately it is only 1 Volt
peak-to-peak@50 Ohm, representing about 10 mW, not sufficient to drive the
G0MRF-PA.
Does anyone of you have a proven scheme of a small linear PA available,
that delivers about 2 or 3 Watts from 10 mW, preferably from 18 Volts
(which is the voltage used by the exciter)? I am sure a small audio
amplifier would do ...
Thank you very much, best 73
Geri, DK8KW (W1KW)
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