Looking at the fundamentals (not often learned by some RF engineers, and
almost never by digital engineers) any variation in the amplitude
response of a system is accompanied by variation in the phase response.
Ears don't like it, and decoders don't like it. Those engineers urging
wide bandwidth for RTTY know those fundamentals.
73, Jim K9YC
On Wed,3/8/2017 4:35 PM, Fred Jensen wrote:
The less AGC compression on HF channels, the better the decode.
However, adjusting AGC parameters on many military HF radios was a lot
harder than on the K3. [:-) And, for what it's worth, any BW less
than about 300 Hz, and better 350 Hz, is going to degrade the
decoder's capability at 45.5 baud ITA-2. Wider BW in QRM will too.
It's an engineering trade-off.
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