[GreenKeys] re mod 33 and mpc 1000

[James M. Walker]

Hum let's see if I can be of assistance here!

<snip>



> Earle,
>
> Most Model 33's require a 20 ma. loop which typically
> is at 24VDC. Some 33's might have an RS232 interface.

Actually it ranges from around 6.5 volts up to 120 vdc depending on the
installation,
and application usage!

>
> The Dovetron has an RS232 interface which would drive
> a 33 with the RS232. If you need to drive the current loop,
> you could make a small adaptor which would convert
> the RS232 to key the 20 ma. loop.

Yes there are several examples of this on the web, however all RS-232 to 20
MA
loop "circuits do NOT work, without changes to the 20MA side.

>
> Now, the real clinker....there is absolutely no ASCII
> RTTY on the air these days (really never was). And, there
> is little commercial RTTY (Baudot), too.

Try 17,205.3 Khz and tune around there, some is inverted but copy is there,
also
a lot of foreign ships still have it and use it, especially the "emerging"
nations. Try
starting you listening around 16 Mhz and go as high as 20 Mhz there is
Baudot Ascii
and even news services still there just not as consistently as in days of
"OLD"!

>
> The ARRL does send bulletins in ASCII on weekdays,
> but I never bothered to try to copy since I'm close to them
> and can only hear them on 80 meters (noisey). Their
> 170 HZ shift, 60 WPM shift Baudot comes through
> fine.

Yep, and they run around 600 watts when they run it and it annoys the low
power
as in "QRP" guys as the transmitter is trashy but noone at ARRL seems to
care!

>
> The best you could do would be to get your hands on
> something like the PK232 multi-mode controller.
> It outputs ASCII (I have run my 33 with it) and
> takes anythnig as an input (RTTY, CW, Packet, AMTOR,
> etc.).

Also has some very GOOD filters for those modes, with the original cables as
are
described in the manual the hook-up is very straight forward for everything
from a
VDT, TTY, and even a "PC" type computer there are even freeware programs tha
t
run on various "Platforms" that control the PK-232 in a user friendly
manner.

>
> I don't think you'll get anywhere trying marry the Dovetron
> to the 33. While it will technically work, it would be
> equivalent to being "all dressed up, with no place to go".

Unless of course you ask some of the "Other RTTY Users to switch to that
mode"!

And Merry XMAS to all, and to all a good Byte!
Jim
WB2FCN
All Modes all the Time!

>
> 73,
> Jack WA2HWJ
>
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