[TenTec] Pegasus/Jupe Band Scope Questn

[Steve N4LQ]

Does the bandwidth of the dsp affect the definition of the peaks on the 
scope? If so, wouldn't you need to do some demodulating?
Steve Ellington
N4LQ at iglou.com
----- Original Message ----- 
From: "Duane - N9DG" <n9dg at yahoo.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Tuesday, February 22, 2005 10:01 PM
Subject: Re: [TenTec] Pegasus/Jupe Band Scope Questn


>
> If you want to see the effects of this AGC speed limitation
> download Ten Tec's control program and run it on a decently
> fast PC of 2GHz or so. Set the band to say 40M at night and
> then bring up the sweep panel and then click on "Sweep". It
> will indeed sweep quite fast but you will also see a series
> of "saw teeth" on the display. The saw toothing effect is due
> to the decay time of the AGC being too long. For several new
> frequencies that sweep is tuning through the AGC will still
> be dropping even though there is no longer a strong signal
> there.
>
> I've been long convinced that a *new* "mode" that is
> specifically designed for sweeping could be done in firmware.
> This mode would not do any demodulation of signals of any
> kind. It would have essentially instant AGC decay, or no AGC
> whatsoever. All that it would/should do is measure signal
> strength and report it. If the DSP is only doing that then I
> would think that it could be made to go much faster while
> still providing a very nice sweeping action. Now I believe
> that the only choice is to pick one of the exiting modes and
> read its S-Meter value repeatedly.
>
> Duane
> N9DG
>
>
> --- Steve N4LQ <n4lq at iglou.com> wrote:
>
>> Thanks Carl. It makes sense. When the Jupiter does it's own
>> scan, it's much faster. 2 questions:
>>
>> Does the agc not affect the Jupe in standalone mode
>> scanning?
>>
>> Could a firmware change take care of this?
>>
>> Steve Ellington
>> N4LQ at iglou.com
>> ----- Original Message ----- 
>> From: "Carl Moreschi" <n4py at earthlink.net>
>> To: "Discussion of Ten-Tec Equipment"
>> <tentec at contesting.com>
>> Sent: Tuesday, February 22, 2005 9:34 PM
>> Subject: Re: [TenTec] Pegasus/Jupe Band Scope Questn
>>
>>
>> > Steve,
>> >
>> > I experimented with this a lot in developing the
>> software.  The limiting
>> > factor is the speed of the AGC.  If I run the sweep
>> faster, the AGC does not
>> > change quickly enough to give any decent resolution.  The
>> program has a
>> > loop that goes ike this:
>> >
>> > 1) Set a frequency
>> > 2) read S meter
>> > 3) plot a point on the graph
>> > 4) Go to step 1
>> >
>> > If you do this too fast, the returned S meter reading
>> does not change
>> > enough
>> > from the previous reading for good resolution.  I hope
>> this explanation is
>> > clear.
>> >
>> > 73,
>> >
>> > Carl Moreschi N4PY
>> > Franklinton, NC
>> > ----- Original Message ----- 
>> > From: "Steve N4LQ" <n4lq at iglou.com>
>> > To: <tentec at contesting.com>
>> > Sent: Tuesday, February 22, 2005 9:21 PM
>> > Subject: [TenTec] Pegasus/Jupe Band Scope Questn
>> >
>> >
>> >> What limits the speed of the Peg/Jup's band scope? When
>> I used the
>> > Jupiter's bandscope it was fairly fast but when using it
>> in Peg mode, it is
>> > really s l o wwww.
>> >> Is this the fault of the rig, firmware, comm port, pc
>> processor, software
>> > (N4PY) or what?
>> >> I want the sucker to really fly but I want to see it on
>> the computer, not
>> > the Jupe's little green display. What would it take? Has
>> anyone found
>> > anything that makes a difference?
>> >>
>> >> Steve Ellington
>> >> N4LQ at iglou.com
>
>
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