[GreenKeys] Dovetron

[Don and Diana Cunningham]

Larry,
On 170 shift (not 150) mark is 2125 as you said, space is 2295.  850 shift 
that you mentioned in your email is still mark 2125, but space is 2975.  The 
"mark high" or "mark low" comes in when trying to tell someone what 
frequency you are on, not setting the shift tones.
73,
Don, WB5HAK
----- Original Message ----- 
From: "Larry Tighe" <larryradio at worldnet.att.net>
To: <greenKeys at mailman.qth.net>
Sent: Saturday, March 31, 2007 7:52 PM
Subject: [GreenKeys] Dovetron


> Hi Folks,
>
> Need some basic info (again) here.  I was trying a test with Gene and he 
> determined the shift was 850.
>
> Just opened the Dovetron and found the Mark and Space pots.  I put the 
> modem into the "MS" mode which sends Mark and Space from the local 
> oscillator right into the input circuit for testing.
>
> I set the Mark decode pot to 2125 and adjusted the osc. to Mark 2125.
>
> The BIG QUESTION is:  Should Space be 150 below or above the Mark tone?
>
> I seem to remember folks saying Mark is high.  Not sure.
>
> If this were on a wireline circuit...would Mark be low and Space high or 
> visa versa.  Is relationship different when used with LSB (radio) from a 
> wireline?
>
> Many thanks for the continuing patience.
>
>
> Larry
> K2JIA
> www.antiquetelephone.com
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