[GreenKeys] 2018 RTTY Roundup, and doin' it Heavy Metal

[Michael O'Day]

Mark,



* "from Walt Kelly's beloved syndicated comic strip "Pogo", sung with
fervor to the tune of "Row Row Row Your Boat":*

*"Roar, or owe yogurt*

*Jennie Dawn Arlene!*

*Warily hairily, verily scarily*

*Lycra butter spleen!"*

Also sounds a lot like Billy and The Boingers . . . . . . . .



On Sun, Aug 6, 2017 at 1:02 PM, <epvgk at limpoc.com> wrote:

> On Sun, Aug 06, 2017 at 10:31:27AM -0500, Mark Hall wrote:
> > I mentioned my choice of machine- a model 19 I have to get to Oklahoma
> > first- the original "ASR". One of its former owners was a ham who used it
> > for RTTY. In the back compartment of its table, not far from its REC-33
> > power supply are two brackets that hold a "BUO" (a circuitboard of
> unknown
> > origin- most possibly some ancient RTTY interface!) Among its goodies is
> a
> > large cookie tin with the owner's original QSO tape, along with some
> other
> > tapes- RTTY pics, a QSO card and other things. So cool. It has a
> pedigree.
> > And I want to return it to the airwaves to what it used to do! I
> mentioned
> > several TU's I had to work with as well, and Dave offered his insights:
> >
> > "For your Model 19, I would recommend any of the HAL TU's ie., ST-5000,
> > ST-6, ST-6000.  These will provide a direct conversion of AFSK to Loop (I
> > think 60MA for your rig - but not sure) and loop to AFSK.  So you only
> need
> > one box between your radio and teletype."
> >
> > The bull is charging... ears tucked back, horns down, nose ring
> flapping...
> > Dave's reply offers some really great advice:
> >
> > "I think you are ready to rock and roll - I would prefer the ST-6 to the
> > other units although your Dovetron should be easier to tune - with the
> > Mark/Space scope and all - I just like the HAL stuff and when the
> > opportunity presented itself, I was able to buy from HAL a NOS ST-5000
> and
> > NOS ST-6000 - seems they found the units hiding in the warehouse.
> >
>
> Having experimented with this setup myself (though not for contesting) I
> have a
> couple of comments.  The ST-6000 (probably 5000 too) has a nice feature
> where it will
> detect that you've started typing and toggle a signal line which you can
> use to key
> a transmitter, and it will switch back after a short delay, which means no
> tx/rx switch
> needed. It also has an AC outlet you can use to switch on a TTY when data
> is detected
> and then off again after a couple minutes idle, for unattended reception.
>
> The AFSK frequencies are fixed and With 170hz shift this works out ok, but
> with wider
> shifts (like when talking to people using 850hz shift military gear) the
> higher tone
> falls outside even the widest transmit bw filter on any radio I have, so
> cannot be used.
>
> Another option on some Icom radios (I use an IC7000) is a "native" FSK
> RTTY mode
> where to transmit you feed it an on/off signal to shift the carrier,
> rather than
> feeding audio tones to the radio. This works nicely because you don't have
> to worry
> about audio levels, etc.  http://heepy.net/index.php/
> Keying_IC-7000_fsk_from_tty_loop
>
> eric
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