Classically, in ye olde days of mechanical printers, diversity combing
was done post detection in the modem. Two receivers feeding two modems,
and the detector outputs of the two modems were combined with a
switching device that selected the output with the best SNR.
With CW, the operator's wet-ware can separate the two channels and
perform a version of best channel selection.
Jack K8ZOA
On 2/18/2013 6:15 PM, [email protected] wrote:
I'm wondering if diversity receive might help with RTTY decoding, to
reduce deep fades.
I shorted together the left and right channels from the Line Out jack
on the back of the K3, and fed them to right input of computer sound
card. (The left input of sound card is connected to a TS-850, for SO2R.)
I was concerned that bridging the two audio channels in this way would
cause the diversity separation in the headphones to be lost (e.g.,
when operating CW, and having the bridged audio line for RTTY decoding
still connected). But the headphones seem to still work as before,
with separate channels audible, L-R. I'm guessing there's a buffer
amplifier that feeds the rear panel line out jack, so that shorting
those channels doesn't effectively short the other audio L/R outputs
(e.g., headphones).
Does anyone know for sure? 'Anyone see a downside to this approach?
(I recognize I might be trading one problem for another: instead of
QSB in one channel, I now might sometimes have the L- and R-channels
equal in amplitude and out of phase, leading to a nil combined signal
for the decoder at odd intervals. But that seems a low probability.)
Tnx,
/Bill, K2PO
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