[R-390] Kahn SSB Converter

[Harold Hairston]

All very interesting! Is this type equipment still in operation? What type 
of communications wold utalize this mode. Who was/is Kahn? I assume the era 
was 60's - 70's??? I have been around the loop a couple of times, including 
Army Sig Corps service and never heard of the mode or Mr. Kahn. Maybe too 
new for me.

Harold

----- Original Message ----- 
From: "Bob Camp" <ham at cq.nu>
To: "rbethman" <rbethman at comcast.net>
Cc: <R-390 at mailman.qth.net>
Sent: Wednesday, May 07, 2008 7:45 AM
Subject: Re: [R-390] Kahn SSB Converter


Hi

Lots of people use this kind of stuff.

The Airphone system started out with a Kahn SSB setup using a -20 db
suppressed carrier at UHF. The FCC rejected it as not being spectrally
efficient enough. Had to go back and put a pilot tone in the middle of
the audio to make them happy. Thank goodness it didn't change my end
of it though ....

Bob

On May 7, 2008, at 7:35 AM, rbethman wrote:

> Sheldon,
>
> Thanks for the correction.
>
> I was trying to convey that the normal every day Amateur Radio  Operator 
> is NOT equipped to work this mode.
>
> Now that is NOT to say that you can *hear* some interesting 
> communications!  Just DON'T repeat what you hear to a third party!
>
> They put the Electronic Communications Privacy Act into effect  starting 
> in 1986.  They KEEP modifying it.
>
> Net result - It IS a Federal offense to repeat to a NON-Participant  of 
> the communications to a NON participant - EVEN if you DO monitor  it.
>
> Bloody rules!
>
> Bob - N0DGN
>
> Sheldon Daitch wrote:
>> With all due respect, ISB was not unique to the US military.
>>
>> The VOA ran ISB transmitters at both Greenville transmitter sites,
>> and I am almost sure the same for Delano and perhaps Dixon, as
>> well.  I never worked at Delano but my notes indicate #9 and #10
>> at Delano were Continental 617As
>>
>> When we were still in the HF relay operations, there were three
>> transmitters at both Greenville sites running ISB for our program  feeds.
>> Transmitters #10 and #11 at both Greenville sites were TMC GPT-40s
>> and #9 at both sites were Continental 617As.   All the exciters at 
>> Greenville were
>> TMC MMX-2 units, capable of running ISB and were the wide band
>> audio options, with 5-6 kHz wide filters.  Don't hold me to the exact
>> bandwidth, as I don't have a TMC manual handy.
>>
>> The TMCs at Greenville originally used one of the tubed versions of 
>> TMC's
>> ISB exciter systems.  The equipment was in the rack in 1979, when I 
>> started
>> working there, but the MMX-2 was the operational exciter.  Last  time I 
>> was
>> in Greenville, 2005, maybe, all the old tube tube exciter units  were 
>> gone
>> with only the MMX-2s in place.
>>
>> 73
>> Sheldon
>> WA4MZZ
>>
>>
>>
>>
>> rbethman wrote:
>>
>>> It uses nuvistors.
>>>
>>> It is NOT a "NOT" a plain Jane SSB converter.  Its purpose was to 
>>> receive ISB, (Independent SideBand),  a unique method used by the  U.S. 
>>> Military.
>>>
>>> Bob - N0DGN
>>>
>>>
>>
>
> -- 
> Bob Bethman/NØDGN/BC-610/Northern Radio SP-600 Manassas, VA -  MultiBand 
> Dipoles
>
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