[TenTec] A question for those who know whats going on under thehood :)

[Carl Moreschi]

The first local osc outputs a frequency of 45 to 75 mhz (45 mhz higher than
the operating frequency) in 2.5 khz steps depending on the operating
frequency.  This frequency is controlled by the onboard firmware.  After the
first mixer, this produces an IF frequency of 45 mhz.  Then local osc 2 runs
at a fixed 44.5425 mhz and converts the 45 mhz IF to a 455 khz IF.   Then
local osc 3 runs at a fixed 467 khz and converts the the 455 khz IF to 12
khz.  This frequency then goes into the DSP section for detection and 1
hertz resolution.  There is no way to monitor any of the oscillators
externally and determine the frequency closer then 2.5 khz because the fine
adjustment to 1 hertz resolution is all done in DSP.  Such is the nature of
DSP radios.  The old analog schemes of the past are gone.

Carl Moreschi N4PY
121 Little Bell Drive
Bell Mountain
Hays, NC 28635
----- Original Message ----- 
From: "dw" <bw_dw at fastmail.fm>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Saturday, January 20, 2007 5:46 PM
Subject: [TenTec] A question for those who know whats going on under thehood
:)


> Hey Gang,
> Here is a Jupiter (under the hood) question.
>
> The local oscillator 'A' , is it continuously outputting the frequency
> which is displayed?
> or is it outputting an IF frequency?
>
> If answer is yes, it is outputting continuously, the displayed
> frequency,
> then next question is.....
> Is there a way to tap onto a board and monitor the current frequency?
>
> Thanks
> Duane
> N1BBR
> -- 
>   dw
>   dw at sover.net
>
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