Someone had a tip the other day (W4TV?) recommending setting the
soundcard output level on the high side, thereby minimizing mic
gain on the radio side, keeping unwanted hum and distortion at a
minimum. That sounded like a good idea to me.
On the K3, apparently there is a special 400 Hz DSP filter that
can be engaged in the AFSK transmit audio path. That filter has
also gotten good reviews from the guys who recently did the
FSK/AFSK comparison study. The MMTTY high order transmit filter
also got good reviews.
I am also considering going to AFSK, just to get rid of the K3's
whacky power transients on FSK. I am tired of seeing amplifier
screen current jump all over the place. It makes me nervous.
Dave Hachadorian, K6LL
Yuma, Arizona
-----Original Message-----
From: Dennis
Sent: Sunday, January 27, 2013 8:57 AM
To: rtty@contesting.com
Subject: [RTTY] AFSK Tips
Having read some of the issues about AFSK vs FSK, I'm thinking of
changing over
from FSK to AFSK operation. I'll be using a K3, if that matters.
I
already know about
not overdriving the mike input, but other than that, are there
any tips
for AFSK
operation in general, or K3 specific?
Dennis W1UE
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