On RTTY, AF limiting doesn't occur because I run the AF Gain very low. I
only need to hear the presence or absence of a RTTY signal.
On CW, I agree, because I turn the AF Gain up higher. But, I also run a
lower AGC THR than I would on RTTY. Thus, when changing modes between CW
and RTTY, it is
For RTTY, AGC should be Off, another conflict with conventional
thinking.
Ed is correct on this, but turning AGC off on the K3 causes
problems with loud signals due to the hard-limiting and
distorting action of the AF Limiter. A better approach with the
K3 is to use fast AGC, AGC SLP=0,
RTTY audio tones are personal choice only affecting the audio at your
station. I can use 2125/2295 and you can use 1275/1445 when we communicate
with each other. This is analogous to me using a CW pitch of 800 Hz and you
using 400 Hz in the same QSO. The local audio tones we each choose have
Sent: Wednesday, April 13, 2016 8:56:06 AM
Subject: Re: [Elecraft] K3s AFSK frequencies
The optimal band width may depend on how crowded the band is. Wide
filtering may work well for a DXer trying to copy a super weak signal on a
quiet band. I only use RTTY in contests when the bands are pa
Too narrow a filter results in "smearing" one bit into the next -
equivalent to severe multi-path - which causes a degraded signal
to noise ratio. While a narrow IF filter may reduce interference
from AGC capture, there is a fine line between the improvement
in sensitivity due to keeping the
The optimal band width may depend on how crowded the band is. Wide
filtering may work well for a DXer trying to copy a super weak signal on a
quiet band. I only use RTTY in contests when the bands are packed and I
have had great results using very narrow roofing filters.
John KK9A
from: Dave
To: elecraft@mailman.qth.net
Subject: [Elecraft] K3s AFSK frequencies
Hello to the group. I just put my new K3s/100 into service, and
have a
question about the Mark frequency to use with AFSK. Before the
K3s, I
used a SignaLink with my KX3 and MMTTY. With that setup, I set
MMTTY to
use 915 Hz
-Original Message-
From: Mike Dodd
Sent: Tuesday, April 12, 2016 8:03 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K3s AFSK frequencies
Hello to the group. I just put my new K3s/100 into service, and
have a
question about the Mark frequency to use with AFSK. Before the
K3s, I
used
Hello to the group. I just put my new K3s/100 into service, and have a
question about the Mark frequency to use with AFSK. Before the K3s, I
used a SignaLink with my KX3 and MMTTY. With that setup, I set MMTTY to
use 915 Hz for the Mark frequency, and everything worked fine.
Fiddling with the
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