[RTTY] AFC and NET: No, thanks

[f6irf at free.fr]

Hi Bill
I just get the impression that you are taking me for a beginner...(*)
Never said that you have to use AFC when S&P'ing... just said that with N1MM it
was not possible to forget the AFC when doing S&P (don't tell me it never
happened to you... at least I know it happens to many people...). Now you may
prefer to use manual RIT or split rather than AFC when CQ'ing, it still
does not mean that AFC is completly useless... (personaly I use RIT or second
VFO only when the guy is outside the filter, in a large majority of case
MMTTY-AFC capture is fast enough to get the call decoded on the first attempt,
and this leaves me the 2 hands free to enter the call on the kboard if
required... ie partial call decoding due to pile-up or conditions )

But don't want to argue more... once again the purpose of my mail was a tribute
to TOM an his team for their free work...
And at the end what's important is that the mode activity continues growing
thanks to a few freeware products like MMTTY and N1MM (who will contest that
MMTTY played a substential role in the new age of RTTY).

Best regards Patrick

(*)if you have doubts  - just look at the photo-page on
http://life.itu.int/radioclub/
Was already there in 1997 together with TY1PS and other club friends when we
setup a new-world record...



[RTTY] AFC and NET: No, thanks
from [Bill Turner] [Permanent Link][Original]

To:  rtty at contesting.com
Subject:  [RTTY] AFC and NET: No, thanks
From:  Bill Turner <dezrat1242 at ispwest.com>
Reply-to:  dezrat1242 at ispwest.com
Date:  Wed, 20 Oct 2004 11:19:07 -0700
List-post:  <mailto:rtty at contesting.com>

On Wed, 20 Oct 2004 13:58:59 +0200, f6irf at free.fr wrote:

>FSK users: You will never forget to remove the AFC and reset to 2125 when
>going to S&P:  N1MM automatically resets MMTTY to your FSK freq pair (and
>toggles the AFC according to the context - IE AFC on when CQ'ing / AFC off
>when a station has been decoded  -  AFC-off+ reset to default mark when going
>S&P )

_________________________________________________________

For what it's worth:  IMO, AFC should NEVER be used during a contest
and here's why.

When you're doing S&P and tuning across the band, AFC will reach out
and "grab" the other station before you have it correctly tuned in.
As a result, your TX frequency will be off from your RX frequency by a
certain amount.  The only way to compensate for this is if you're
using AFSK, you can turn on both AFC and NET, but why bother since you
need to turn them both off when CQing.  Just use RIT for what it was
intended.  Actually, I don't even use RIT.  When CQing I use split A
and B VFO's, thereby allowing me to tune with the big knob instead of
the little one.  Either way is better than AFC/NET.

AFC and NET:  Spawn of the devil.  :-)

--
Bill W6WRT

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