[GreenKeys] Fwd: Re: [DrakeRadio] RTTY with the T4xb
Jeffrey D Angus
jdangus at att.net
Tue Aug 4 10:51:49 EDT 2015
Thought you guys would be interested in this tidbit.
Jeff
-------- Forwarded Message --------
Subject: Re: [DrakeRadio] RTTY with the T4xb
Date: Tue, 04 Aug 2015 10:40:13 -0400
From: Garey Barrell k4oah at mindspring.com [DrakeRadio]
<DrakeRadio at yahoogroups.com>
Reply-To: DrakeRadio at yahoogroups.com, k4oah at mindspring.com
To: drakera >> Drake Radio <DrakeRadio at yahoogroups.com>
Mark -
Yeah, Irv was just getting into computers when I left. Forward Error
Correction (FEC) was big
for a while, ARRL even sent the bulletins with it for a while.
I was in Huntsville AL at the time, so we always had 20+ signals most
all the time too. We had
a couple of guys in Northern VA and another in S Florida, along with
perhaps another half dozen
scattered around the country. There were times when I couldn't hear the
east coast stations,
and would relay through Irv. This was kind of the germ for the CATC program.
He was a Captain for United Airlines, and his line was back and forth to
Hawaii. Tough duty,
but somebody had to do it! I was working 'normal' hours, 0730-1600 at
NASA and 1630 to 2000 at
the ham store for a while. We rarely communicated in 'real time'. I had
to put a paper winder
on the 28 after coming home from work a few times and finding the shack
FULL of yellow paper!
:-) His station was an S-Line.
You came along well after the 'Mouse' and 'Rat' machine caper. Irv came
across a stash of
retired Western Union M28 ASR, KSR and wall mount machines. He snagged
them, and started a
distribution method to spread them around. You can imagine what a
firestorm that created! Most
of us were running 15 and 19 machines and the 28's were like Collins to
Heathkit..... Irv's
wife, Arlene, named them Mouse (KSR) machines because the scurrying
around to get one was like a
bunch of mice after a pile of cheese....... I was the 'distributor' for
the SE, and he shipped
an ASR (Rat) and KSR (Mouse) for me along with four other 'Mice'. We
shipped them via Atlas Van
Lines, blanket wrapped, on a regular moving truck. They tucked them in a
'less than full' truck
heading from SFO to Huntsville, took about a month for a suitable ride
to come up. I've
forgotten the cost, but it was considerably less than freight shipment,
and didn't require
packing! One guy came from Birmingham, another from Chattanooga, and two
from Atlanta to pick
up their machines. Certainly upped the machine quality in the SE!! :-)
They were in excellent
condition, having been maintained right up until being retired. They
were that awful WU green,
so I repainted mine with gray wrinkle. Came out really nice looking, and
was a dream to type on
compared to the 15.
Yes, they were good times. I understand that looking back you see only
the good things, making
those years 'golden', but while I've had much pleasure and enjoyment in
ham radio in the 40+
years since, those years were the most fun. The only better time was
1957 when I had my Novice
license and EVERYTHING was new and fun.....
73, Garey - K4OAH
Rome, GA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
mgilger at brightdsl.net [DrakeRadio] wrote:
> Garey,
> So your the guy, ha? The DT-600 was sure a nice concept and like you
said eliminated the
> backplane that was required for the ST-6. My first TU was the ST-5,
which I used for maybe 2
> years before building the DT-600. You did an excellent job designing
that for sure. Also used
> the UT-4 along with it, I forget if maybe Irv designed that or not.
Don't recall.
>
> When I was involved with Irv, I had gotten a Heathkit H8 computer and
he got into writing RTTY
> programs for that. He wanted to send the code from his terminal to my
H8 automatically. So
> he wrote a small program to do that, which then enabled us to send
the larger upload/download
> program that auto verified that the code got transmitted correctly.
Everything was sent in 256
> byte machine code blocks on 14.072.5. To veryfiy the code got sent
correctly it required him
> to send it 2 times, which the program then compared one against the
other and would tell us
> which 256 byte block did not match. He could then send the required
defective block again
> where I would then merge the new block into the larger program where
it was once again
> verified that the code matched. We eventually got to the point he was
able to develop a very
> nice program that was originated on his end, sent to me over 14.072.5
to verify and assemble
> and test. He was a pilot so it usually worked out that I would test
while he was flying and
> then tell him what did or did not work when he was back on the
ground. The neat thing about
> the whole process was that Irv and I had such good 20 meter
conditions, we very seldom had to
> resend the code due to transmission errors. Both of us were 20+ all
the time and that was with
> only about 50 watts output from the 'C' line. I think he was using a
Collins 'S' line as I
> recall and was running about the same power levels.
>
> Somewhere along the line he added a neat feature to the program that
enabled all of the net
> stations to see who else was monitoring the freq. by sending the
command :TIME. This command
> would turn everyone transmitter on and send the motioning stations
call sign and the time. If
> there was a message we wanted to get to a station that was not in our
path, we could relay the
> message through one of the stronger stations that responded back to
the :TIME command. So on
> 20 meters, if there was a station 50 miles away from say my location,
that was too close for
> him or I to hear each other, but we both were in good path from say
the east coast. So we
> would relay that message through the east cost station and be able to
hold a conversation
> where originally we could not. Worked great and everyone had a good
time with that feature.
>
> Anyway, all this was done using your DT-600 TU and my 'C' line using
AFSK and 50 watts. With
> the 'C' line running 24x7, it held freq. usually to within 5-10 hz.
Enough so we never drifted
> out of the 170hz window. As I recall I never had to replace the
finals in the T-4XC, which
> surprised me. Had a spare set, but never had to use them.
>
> Good times by all back then.
>
> Mark, WB0IQK
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Posted by: Garey Barrell <k4oah at mindspring.com>
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