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

[dw]

Thanks Carl,
I already have the tuner, and the pic to control it, just investigating
a way to get frequency info to the pic direct from the Jupiter.
I've seen screen-shots of your software!  Extremely impressive!
You must have been at it for a few years :)
It looks pretty mature.

On Sat, 20 Jan 2007 20:59:37 -0500, "Carl Moreschi" <n4py at arrl.net>
said:
> 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
> > > >
> > > > _______________________________________________
> > > > TenTec mailing list
> > > > TenTec at contesting.com
> > > > http://lists.contesting.com/mailman/listinfo/tentec
> > >
> > > _______________________________________________
> > > TenTec mailing list
> > > TenTec at contesting.com
> > > http://lists.contesting.com/mailman/listinfo/tentec
> > -- 
> >   dw
> >   dw at sover.net
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec at contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
> 
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
-- 
  dw
  dw at sover.net