[RTTY] FSK is bad?

[Salvatore Irato]

Yes Bob you right about the note pairs selection with ICOM.

But, let me work from memory. Not the 756PROIII nor the 7600 could enable
that dreaded TPF - dual audio filters on tone pair - out of the 2125 Hz
Mark option.
On different tones options, than the 2125 Mark, the ICOM TPF doesn't
engage, isn't?

This is not happening on the K3 and also there is one more option for the
same feature on the Elecraft side.
Anyway, as the K3 is another beast I do not use anymore often that feature.
It's quite not needed. Playing with DSP and MF filters payback a lot more
than engaging TPF. With both the two ICOM TPF engagement mechanism, the old
one on the 756PROIII and the worst on the ICOM 7xxx series.

Unluckily for me, the 7600 was enough bad when in FSK TX to give around me
more space when I was in RUN. (and to delivery hot cakes when in needs)
Now with K3s I have much more neighborhood willingly to QRM me, but not
affected by my more tight FSK TXed signal. Bad luck.

   73 de iw1ayd Salvo

PS I simply would don't trust Variable Operations AFSK, nor having a more
complicated setup than with FSK and Microham: KIS.


Message: 4
Date: Tue, 25 Oct 2016 20:24:39 -0400
From: Bob Burns W9BU <w9bu_lists at rlburns.net>
To: rtty at contesting.com
Subject: Re: [RTTY] FSK is bad?
Message-ID: <28ba0a2b-940d-5399-4a7a-152f354c1043 at rlburns.net>
Content-Type: text/plain; charset=windows-1252; format=flowed

Late model Icom radios, including the IC-7600 that I use, gives the user
the option of setting the RTTY FSK Mark Frequency to 1275, 1615, or 2125
Hz. The default is 2125 Hz. The downside of selecting either of the two
optional frequencies is that the internal RTTY decoder and the twin peak
filter only works when 2125 Hz is selected.

I don't care for the sound of 2125 Hz RTTY, so I typically use 1275 Hz
and let MMTTY or 2Tone decode the signals.

Bob...

On Wed, Oct 26, 2016 at 2:28 AM, <rtty-request at contesting.com> wrote:

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> Today's Topics:
>
>    1. 2016 WAE RTTY NA LP Plaque (Don Hill AA5AU)
>    2. Re: FSK is bad? (Bill Turner)
>    3. Re: FSK is bad? (Jeff AC0C)
>    4. Re: FSK is bad? (Bob Burns W9BU)
>    5. Re: FSK is bad? (Joe Subich, W4TV)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 25 Oct 2016 18:30:54 -0500
> From: "Don Hill AA5AU" <aa5au at bellsouth.net>
> To: "'RTTY Reflector'" <rtty at contesting.com>
> Subject: [RTTY] 2016 WAE RTTY NA LP Plaque
> Message-ID: <004e01d22f17$d5a7e870$80f7b950$@net>
> Content-Type: text/plain;       charset="us-ascii"
>
> I will not be defending my 2014 & 2015 WAE SOLP NA titles and Mark, N2QT,
> says he will not be QRV for the contest (Mark, if that's not true please
> let
> use know - Mark is the king of WAE LP in NA). So the plaque is out there
> for
> taking. If you want a nice piece of metal for your wall, go for it!!!
>
> Here is a hint for getting more QTCs while SO2R. Be willing to receive QTCs
> on your second radio so you can be receiving QTCs while running on your
> other radio. If you send QTCs, you are shut down on the second radio
> because
> you can't transmit. If you are really brave, try receiving QTCs on both
> radios. The trick to this is to concentrate on the QTCs which start first.
>
> I'll be contesting remotely with Team W4AAW. We will be QTC friendly.
>
> A side note about W4AAW to those stations outside NA. If we call you and
> you
> ask us for QTCs and we decline, it means you are working the MULT station.
> In order to abide by the rules, only the RUN station will exchange QTC
> traffic. The RUN station will mostly likely be the one calling CQ and will
> be spotted on the Packetcluster. Find the RUN station and we will be happy
> to exchange QTCs.
>
> Have fun!
>
> 73, Don AA5AU
>
>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 25 Oct 2016 23:35:02 +0000
> From: Bill Turner <dezrat at outlook.com>
> To: RTTY Reflector <rtty at contesting.com>
> Subject: Re: [RTTY] FSK is bad?
> Message-ID:
>         <CY1PR0301MB1196F4933F5B5677A3A53B80C0A80 at CY1PR0301MB1196.
> namprd03.prod.outlook.com>
>
> Content-Type: text/plain; charset="us-ascii"
>
> ------------ ORIGINAL MESSAGE ------------(may be snipped)
>
> On Tue, 25 Oct 2016 16:59:43 -0500, Jeff wrote:
>
> >Another advantage of AFSK is that you
> >get to set the tone pair where it sounds good to your ears instead of
> being
> >stuck with the 2100 hz rasp of rigs without a low-tone pair option force.
>
> REPLY:
>
> MMTTY allows you to choose from many different tone pairs in FSK mode.
> The difference is not really in the transmitter, its in the receiver.
> For years I have used 1275/1445 because like Jeff says it sounds
> better. The RF transmitted signal is exactly the same, only the
> receiver is different.
>
> 73, Bill W6WRT
>
>
> ------------------------------
>
> Message: 3
> Date: Tue, 25 Oct 2016 18:49:36 -0500
> From: "Jeff AC0C" <keepwalking188 at ac0c.com>
> To: "Kok Chen" <rtty at w7ay.net>, "RTTY Reflector" <rtty at contesting.com>
> Subject: Re: [RTTY] FSK is bad?
> Message-ID: <B9CFFB687D2246159266F957DA94749F at w520>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>         reply-type=original
>
> That's true.  But you do have a few good software choices in the case of
> AFSK, and the change from one to the next is not too painful.  In the case
> of FSK, if you don't like what you have, only a rig change remains.
>
> 73/jeff/ac0c
> www.ac0c.com
> alpha-charlie-zero-charlie
>
> -----Original Message-----
> From: Kok Chen
> Sent: Tuesday, October 25, 2016 5:14 PM
> To: RTTY Reflector
> Cc: Jeff AC0C
> Subject: Re: [RTTY] FSK is bad?
>
>
> > On Oct 25, 2016, at 2:59 PM, Jeff AC0C <keepwalking188 at ac0c.com> wrote:
> >
> > You change the shaping by moving from FSK where you have zero control
> over
> > to AFSK where you have full control.
>
> "you have full control" is perhaps a little overstated.  It should be "the
> software developer" has full control :-) :-).
>
> 73
> Chen, W7AY
>
>
>
> ------------------------------
>
> Message: 4
> Date: Tue, 25 Oct 2016 20:24:39 -0400
> From: Bob Burns W9BU <w9bu_lists at rlburns.net>
> To: rtty at contesting.com
> Subject: Re: [RTTY] FSK is bad?
> Message-ID: <28ba0a2b-940d-5399-4a7a-152f354c1043 at rlburns.net>
> Content-Type: text/plain; charset=windows-1252; format=flowed
>
> Late model Icom radios, including the IC-7600 that I use, gives the user
> the option of setting the RTTY FSK Mark Frequency to 1275, 1615, or 2125
> Hz. The default is 2125 Hz. The downside of selecting either of the two
> optional frequencies is that the internal RTTY decoder and the twin peak
> filter only works when 2125 Hz is selected.
>
> I don't care for the sound of 2125 Hz RTTY, so I typically use 1275 Hz
> and let MMTTY or 2Tone decode the signals.
>
> Bob...
>
>
> On 10/25/2016 5:59 PM, Jeff AC0C wrote:
> > You change the shaping by moving from FSK where you have zero control
> > over to AFSK where you have full control. Another advantage of AFSK is
> > that you get to set the tone pair where it sounds good to your ears
> > instead of being stuck with the 2100 hz rasp of rigs without a
> > low-tone pair option force.
> >
> > As Joe likes to point out, full control with all knobs turned to 11 is
> > a problem.  But I think that a guy who has learned to use his mic gain
> > control can learn how to set his AF drive level on AFSK.
> >
> > 73/jeff/ac0c
> > www.ac0c.com
> > alpha-charlie-zero-charlie
> >
>
>
>
> ------------------------------
>
> Message: 5
> Date: Tue, 25 Oct 2016 20:27:58 -0400
> From: "Joe Subich, W4TV" <lists at subich.com>
> To: rtty at contesting.com
> Subject: Re: [RTTY] FSK is bad?
> Message-ID: <dd28ccb8-80ee-ffb9-4c81-7bd1af55b1b1 at subich.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
>
>
> On 10/25/2016 5:59 PM, Jeff AC0C wrote:
> > As Joe likes to point out, full control with all knobs turned to 11 is a
> > problem.  But I think that a guy who has learned to use his mic gain
> > control can learn how to set his AF drive level on AFSK.
>
> It is mostly a problem with those who pump the output of their sound
> card directly into the mic jack without an attenuator.  Most rigs -
> particularly those (Kenwood, Yaesu, Ten-Tec) designed for use with a
> dynamic mic - have a fixed gain preamplifier (either a common emitter
> NPN transistor or a low power op-amp).  Driving that preamplifier which
> is designed for an input of about 5 mV with a 4V P-P signal guarantees
> the audio presented to the mic gain stage is already heavily clipped
> square waves.
>
> One is far better served connecting the sound card output (with the
> proper level adjustment network) to the transceiver's "Patch", "Data",
> "PKT", or ACC jack which are typically designed for 100 - 200 mV drive
> (25 to 30 dB higher than the typical dynamic mic) and do not have an
> "uncontrolled" stage between the input and the mic gain control.
>
> 73,
>
>     ... Joe, W4TV
>
>
> ------------------------------
>
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> End of RTTY Digest, Vol 166, Issue 81
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