On Sun,7/19/2015 10:02 AM, Barry N1EU wrote:
Yes, it will improve transmit fidelity.
The words "improve transmit fidelity" in this context are mis-applied.
This is ham radio, and our objective is COMMUNICATION, not wider audio
bandwidth. Lower audio frequencies (below about 500 Hz) make almost no
contribution to speech intelligibility, but burn almost half of transmit
power. A smart ham will cut off those low frequencies to provide better
"talk power."
I don't know who makes those filters, but the Elecraft filters come from
Inrad. The stock Elecraft TX filter is 2.7 kHz, 5 poles. The "upgrade"
is 2.8 kHz, 8 poles. The 2.8 kHz filter is flatter in the passband than
the 2.7 KHz filter. The difference shows up in reduced incidental AM
when transmitting RTTY and smoother audio response on SSB. I have 2.8
kHz filters in my K3s.
73, Jim K9YC
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