[GreenKeys] Low-level and High-level TTY conversion

[Nick England]

What a great list! - Thanks to Duncan, Jim, George, Jack, Jeff, etc. for
helpful info. I'll pass along the recommendations. If anyone in the
Portland OR area is interested, I'm sure the USS Blueback crew would
appreciate help getting their TTY gear on the air. Let me know and I'll
give you contact info.
cheers,
Nick K4NYW
www.navy-radio.com

On Tue, Apr 30, 2013 at 11:07 PM, Duncan Brown <duncanancy at earthlink.net>wrote:

> Nick,
>
> The "Tempest" Dovetron MPC-1000 units had a "low level signaling" aka
> "Mil" interface  and no high level loop supply.  The levels where similar
> to RS-232 and would probably work with these low level M28s. (Probably what
> the Tempest Dovetrons where designed to work with.)
>
> But these M28s probably have stock selector magnets, so there may be a low
> to high converter in the M28 that could just be bypassed.
>
> Duncan
> K2OEQ
>
>
>
>
> On 30-Apr-13 17:11, Nick England wrote:
>
>> Hi gang - I've gotten email from a volunteer submarine restorer who
>> has what he says are 28KSR and 28RO with low-level signaling (+/- 6vdc
>> polar). They want to use these units with the ham gear in their radio
>> room.
>>
>> Is there a ham TU compatible with Low-level signalling ? Would just an
>> RS-232 interface work or are they all unipolar? Would he have to build
>> high-low level converters?
>> Thanks in advance for your help.
>> Nick
>> www.navy-radio.com
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