[TenTec] Lone voice in the wind

[N4PY]

The program has a frequency calibration procedure.  You run this procedure 
at 10 mhz.  Once the error at 10 mhz is determined, the error at all other 
frequencies can be computed.  When you run diversity mode with my program, 
the Orion is not put into diversity mode.  Instead, the program sends the 
same frequency to both VFO's to control both receivers, but these 
frequencies are adjusted to compensate for the error in the 2 receivers.  So 
the main receiver will get a correction for how much it is off in true 
frequency, and the sub-receiver will get a slightly different correction to 
match it to the main receiver.  The display on the Orion will not exactly 
match the program display, but the program display will be exact and the 
radio display will differ by a few hertz depending on its error.  The whole 
trick is to perform the calibrate procedure very accurately.

Carl Moreschi N4PY
121 Little Bell Drive
Bell Mountain
Hays, NC 28635
----- Original Message ----- 
From: "Ken Brown" <ken.d.brown at hawaiiantel.net>
To: "N4PY" <n4py at arrl.net>; "Discussion of Ten-Tec Equipment" 
<tentec at contesting.com>
Sent: Saturday, December 20, 2008 4:54 PM
Subject: Re: [TenTec] Lone voice in the wind


> Hi Carl,
>> My N4PY Orion software has can be operated in diversity mode.  And my
>> program has an adjustment in it to allow for a slight frequency offset in
>> the 2 receivers and correct it.
>>
>>
> That sounds interesting. Can you explain how it works? I thought the
> reason the two receivers are always off frequency by some small amount
> is that they use different PLL schemes, with different minimum
> resolution step sizes. How can software change that? Perhaps I've got it
> all wrong.
>
> Even with different step sizes, at some frequencies the two receivers
> might be on exactly the same frequency. Maybe the N4PY software can be
> operated so that only these particular frequencies can be tuned?
>
> DE N6KB
>
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