[MRCG] RTTY net

[Tim]

Hi Guys...Attached is a file I got from Dave Ross many years ago regarding
the Collins CV-2455 RATT convertor for the PRC-47.  I had checked into the
Clatternet on 10,137 Kc several times using a stock (USB) PRC-47 and
CV-2455.  I do not have a mechanical terminal unit so I used an ancient DOS
notebook computer for a "glass terminal", worked great.  The filters in the
CV-2455 are *really* good.  Photo of this setup in my camping truck...

I had to build an optically coupled teminal interface to convert CV-2455
Loop currents to TTL levels and vice versa.  (The blue box - which included
other stuff at the time)..A simple circuit that worked well interfacing
the RS-232 input on the Laptop...

I forget, but I think my stock equipment (and therefore Clatternet)
probably was Space Low - my CV-2455 does not show any evidence of a Marine
Corps MI as Dave's note indicates...

Also, a Clattenet convention was to turn *off* "diddles" - they apparently
caused the mechanical terminals fits...

By the time I had mounted and tested all this gear in the truck, Clatternet
moved to 80 meters due to propagation conditions between the PAC Northwest
guys and I could no longer work them on Saturday mornings on that
band....This gear worked quite well on 30 meters however...




On Sun, Jul 27, 2014 at 9:57 AM, Mark J. Blair <nf6x at nf6x.net> wrote:

>
> On Jul 21, 2014, at 13:17 , boatanchor at martasystems.com wrote:
> > BTW, for me it'll have to be 850hz shift 45.5 baud baudot.
>
> > I think old clatternet ran Mark=Low, but I can run either way. (
> Remember LSMFT from the Lucky Strike ads? An old timer TTYer told me: LSMFT
> = lower space makes fine teletype )
>
> I'm just reading up on RTTY conventions. Mark high is conventional for ham
> radio operation, but I seem to recall that Clatternet ran mark low due to
> limitations of certain unmodified military RTTY gear. Do any of y'all
> happen to know the details of this?
>
> I'll initially need to use my boring modern hardware until I get my cool
> vintage RTTY gear up and running.
>
> --
> Mark J. Blair, NF6X <nf6x at nf6x.net>
> http://www.nf6x.net/
>
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