Dave,
You are likely overloading your walk about receiver with the fundamental 7
MHz frequency causing all kinds of blocking and mixing in the Grundig at other
frequencies..
Lee K7TJR
I'm out of ideas on this one! Where does the raspy modulation come from on
the harmonics which changes with position in my radio room on a battery
operated receiver?
Situation:
transmit on 7.010 MHz
receive on second harmonic, 14.020
transmitter: IC-7300
receiver: IC-7610
and reversed
Demod: CW or SSB (or AM, for that matter)
Fundamental sounds clean. Second harmonic sounds modulated by 120-Hz (and a
few harmonics of the line) and quite raspy - pretty awful.
Receiver: portable battery operated receiver (Grundig G3) with same
transmitters: I can walk around the room tuned to the second harmonic and find
places in the room where things are clean and other positions where the second
harmonic (and third) sound awful with 120 Hz raspy 'modulation'. Any idea how
I can account for this localized behavior? I'm out of theories.
Dave - WØLEV
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