My RX on WSPR MF 477.2 consists of 2 separate systems
1. IC – 706 and 1/4 wave inv L full size on 472 Khz up vert 33 metres rest
horizontal E/W
2. TS-50 and 1/4 wave inv L full size on 1800 Khz and not resonated for 472
Khz
Both systems are totally independent and antennas run at right angles to
one another.
I do notice selective fading—each antenna produces a different signal
strength at times by as much as 10dB, other times both indicate the same
strength.
Antenna space diversity effect.
I set both RX sensitivity Noise inputs to the same level for these
tests
I do notice at times although the received signals are showing on the
waterfall that some do not decode even strong ones at times.
My TX Power at present is only 0dB but I am getting reports/decodes from
M0LMH between –16 and –20 dB but surprised that I am not getting reports from
others
especially in the UK or France and can only conclude that their RX
sensitivity and antennas are POOR.
When I get time I will QRO but need to build an intermediate RF amp between
TCVR and main MF amp
All comments welcome
de MAL/G3KEV
