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

[Carl Moreschi]

The AT-200PC autotuner from LDG, when used in conjunction with my rig
control software, ends up following the rig without having to transmit.  You
just have to tune one time on each frequency and then the tuner remembers
the settings.  My program updates the tuner with a new frequency each time
the frequency changes on the radio.

Carl Moreschi N4PY
121 Little Bell Drive
Bell Mountain
Hays, NC 28635
----- Original Message ----- 
From: "dw" <bw_dw at fastmail.fm>
To: "Carl Moreschi" <n4py at arrl.net>; "Discussion of Ten-Tec Equipment"
<tentec at contesting.com>
Sent: Saturday, January 20, 2007 8:23 PM
Subject: Re: [TenTec] A question for those who know whats going on under
thehood :)


> Hi Carl,
> Thanks greatly for your response!!
>
> I wonder if I could monitor the op frequency anywhere inside then?
> I'm still toying with the idea of controling an external tunner with a
> PIC circuit.
>
> I used to have this with my old icom, but the Jupiter has no external
> band output signal.
> I had thought about polling the rs232 with the PIC and then deriving the
> band from there.
> But then I thought it might be easier to tap onto the op frequency
> somewhere inside with the PIC and send some control signal out to one of
> the unused ports.
>
> The MFJ intelli-tuners derive settings from a combination of swr,
> frequency and complex Z.
> But this requires a tune xmit, as the tuner has no other way of knowing
> op frequency.
> I guess, If I had to, I could do likewise, but it would be nice to have
> the tuner move with the rig when in recieve mode also, like the other
> rigs do.
>
> Thanks,
> Duane
>
> Thanks,
> Duane
> On Sat, 20 Jan 2007 19:47:58 -0500, "Carl Moreschi" <n4py at arrl.net>
> said:
> > 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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> > > TenTec at contesting.com
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> >
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> -- 
>   dw
>   dw at sover.net
>
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