[RTTY] AFSK Tips

[Dave Hachadorian]

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 at 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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