K3 Filters, Shift Control and RTTY

[Ron Kenwood]

I have been playing in the WAE RTTY contest. I am mainly using the 250Hz
roofing filter with DSP bandwidth at 300 Hz. I occasionally use the
1.8kHz filter with DSP set at about 500 Hz. In either configuration, I
find that I have to use the shift control to center signals in the
bandpass. Not sure if this is a hardware or software thing, but in any
case, I have two issues. One is that the minimum shift value is too
large to accomplish what I want to do at the narrow bandwidth, and when
I try to use the dual bandpass filter it appears that shift is disabled.

Am I missing something(highly likely), or do I have to request that
changes be added to the wish list?


Ron W3ZV
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[KK7P]

> ... when I try to use the dual bandpass filter it
> appears that shift is disabled.

The dual bandpass filter for RTTY is preset to one of four tone pairs
which you select by using the PITCH function when in DATA:AFSK A or
DATA:FSK D modes.

73,

Lyle KK7P
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[dave.wilburn]

If the other station has AFC on in their software, they tend to wander
around a bit.  I tend NOT to run AFC if I am S&P, as I line right up
on them.  If I am running and there is activity around me, it is hard
to run AFC, as my signal then wanders around.  But if someone comes up
a bit off, or I have some room around me, I then run it. It then
aligns my frequency with theirs.

Its a lot like CW contests, where so many do not zero you before they
call.

David Wilburn
NM4M
http://www.nm4m.com




Ron Kenwood wrote:

> I have been playing in the WAE RTTY contest. I am mainly using the 250Hz
> roofing filter with DSP bandwidth at 300 Hz. I occasionally use the
> 1.8kHz filter with DSP set at about 500 Hz. In either configuration, I
> find that I have to use the shift control to center signals in the
> bandpass. Not sure if this is a hardware or software thing, but in any
> case, I have two issues. One is that the minimum shift value is too
> large to accomplish what I want to do at the narrow bandwidth, and when
> I try to use the dual bandpass filter it appears that shift is disabled.
>
> Am I missing something(highly likely), or do I have to request that
> changes be added to the wish list?
>
>
> Ron W3ZV
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft   
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

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