[GreenKeys] Dovetron

[Larry Tighe]

Thanks a million Don.

We're on a roll now.

Lar
K2JIA

----- Original Message ----- 
From: "Don and Diana Cunningham" <wb5hak at duracom.net>
To: "Larry Tighe" <larryradio at worldnet.att.net>; <greenKeys at mailman.qth.net>
Sent: Saturday, March 31, 2007 21:18
Subject: Re: [GreenKeys] Dovetron


> 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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>