If the two receivers' local oscillators were even a fraction of a Hz
different in frequency, the perceived "direction" of the incoming signal
would be constantly changing, which I think would be disconcerting.
Alan N1AL
On 02/17/2015 10:09 PM, Wayne Burdick wrote:
Diversity reception is characterized by perceived "phase precessing" between
the two receivers' audio streams due to varying phases of the main and sub RF input
signals. You don't want additional, unpredictable phase precessing on top of that due to
the receivers themselves. Additive phase changes would sometimes make diversity reception
less pleasant to listen to. Better to have the receivers locked together, eliminating a
variable.
Wayne
N6KR
On Feb 17, 2015, at 10:02 PM, Vic Rosenthal <[email protected]> wrote:
I know it's true, but I don't see WHY the receivers need to be phase-locked.
After all, the signals are entirely separate until they are combined in your
head. There isn't a question of interference/ reinforcement at RF.
Vic 4X6GP/K2VCO
On Feb 17, 2015, at 9:31 PM, Wayne Burdick <[email protected]> wrote:
In diversity mode, the main and sub RX synthesizers are guaranteed to be
phase-locked to each other if the crystal filters selected for main and sub
both have exactly the same frequency offset. The offset for all 8-pole filters
is 0.00. The offset for 5-pole filters varies, and can be ordered in matched
sets for main/sub.
Wayne
N6KR
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