[RTTY] Displaying/logging/spotting the correct FRQ using AFSK

[f6irf@free.fr]

For your information, there are solutions working for any transceiver, assuming
the offset is done a the software level...

For example, the AFSK offset is a standard feature in:
- N1MM-logger: the soft displayed/logged/spotted  frequencies take into account
the sideband and the MMTTY mark audio frequency to indicate the correct "mark
RF
frequency" - this also works when clicking on a spot: the transceiver is set
taking into account the trx-sideband and the terminal audio-value.
Btw N1MM also works with MMVARI (for PSK, MFSK, and AFSK-RTTY) with exactly the
same features (except that it is the center frequency of the signal, and not
the mark which is taken into account // +/- 85HZ compaired to "mark" depending
on sideband used ).
- MixW do offer the same possibilities... (but like MMVARI also based on the
RTTY center frequency)- btw mixW displays the NCDXF beacon frequency on the
"advanced waterfall", so the anybody using mixW can't pretend he doesn't
know...
- Just the ones I have tried, but it may be other products doing this (ie
RCK-RTTY?).

Anyway, just for information, because serious RTTY-ops only use FSK ;-)
73's Pat

PS:  Btw, had a problem recently trying to use the mixW FSK port through my
microkeyer and earlier through a convenionnal COM-port: though the problem may
not appear on all computers, it seems that I am not the only one who saw it.
Apparently, it is recommended to untick the UOS option in the mode settings,
otherwise you correspondants may have troubles to decode your signal (not good
for the rate!) - at least it worked in my case...



Re: [RTTY] TS-570 Freq Offset
from [Wolf (DL6JZ)] [Permanent Link][Original]

To:  rtty at contesting.com
Subject:  Re: [RTTY] TS-570 Freq Offset
From:  "Wolf (DL6JZ)" <dl6jz at t-online.de>
Date:  Wed, 11 Jan 2006 12:34:52 +0100
List-post:  <mailto:rtty at contesting.com>

Sorry Dick,

my posting was not exact enough. The radio is able to correct the mark
frequency offset only if you operate FSK (mode selector = RTTY)!!

73 + 55
Wolf, DL6JZ


-----Original Message-----
Date: Wed, 11 Jan 2006 12:21:39 +0100
Subject: Re:TS-570 Freq Offset
From: "Dick Kriss, AA5VU"
To:

Wolf -DL6JZ,

I think you are correct that the FT-1000MP has a built-in offset;
however,
the Kenwood TS-570 does not.  I have a TS-570S(G) and I have have
subtract
2125 Hz from the display reading to get the MARK freq when operating in
AFSK
mode.

Dick - AA5VU

> Date: Wed, 11 Jan 2006 09:30:33 +0100
> From: "Wolf (DL6JZ)"
> Subject: Re: [RTTY] NAQP RTTY on NCDXF Beacon]
>
> Hi Robert,
>
> thank you for your interest in this problem.
>
> There are radios on the market wich have a menue item that corrects
the
> special offset of  the rtty mark tone.  In my case it is the FT-1000MP
> and I know that there are many other radios with the same feature. I
had
> a Kenwood TS-570 some time ago and I am quite sure that there I had
this
> feature too. But you have to go into the menue and select it. The
> default setting is as you described.
>
> If you are running FSK this frequency problem doesn't depend on how
you
> generate the RTTY signal, by a hardware TNC or by software. It depends
> only on your radio!
>
> 73 + 55
> Wolf, DL6JZ