On 12/20/2024 10:53 AM, Mark Lunday wrote:
Sounds like a great justification for diversity reception, which I can do on my
7610.
It's exactly why diversity reception was invented, probably more than
100 years ago! The fundamental concept is that there must be two
receivers, one fed to only one ear, each radio fed by a different
antenna as widely separated as practical, so that when the two signals
are most out of phase at one antenna they will be more closely in phase
at the other.
It's most effective (that is, easier to copy) if the two receivers are
phase-locked to the same frequency, as is done in Elecraft radios, so
the frequency of the CW note is the same in both ears. It produces a
strong characteristic "stereo effect."
They can also be antennas with have different directivity, either
vertically or horizontally. Whether on topband or at VHF/UHF, the
different paths can be arriving from different directions, or from a
lower or higher vertical angle.
Note that two antennas into the SAME receiver is NOT diversity
reception. Some mfrs of rigs, especially SDRs, are doing this, and
calling it diversity. It's not.
73, Jim K9YC
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