Re: [TenTec] Re: More PRO III/Omni VI pix

["Steve N4LQ" <n4lq@iglou.com>]

I'm trying Spectran but don't see that it can show 2 inputs at once. 
Spectrogram is too expensive but at least you can display 2 radios. Do you 
know of any others that can do that?
Steve N4LQ
----- Original Message ----- 
From: "Duane - N9DG" <n9dg@yahoo.com>
To: <tentec@contesting.com>
Sent: Sunday, December 26, 2004 9:49 AM
Subject: Re: [TenTec] Re: More PRO III/Omni VI pix


> I'd be curious what the audio spectrums look like for
> these two radios in the frequency domain vs. the time
> domain that these JPEG's are done in?
>
> It is always interesting to see what audio artifacts a
> radio puts out clear out to 20 kHz or so. I've come to
> believe that these artifacts above 3Khz or so are a
> factor in whether a radio is fatiguing to listen to or
> not.
>
> I use Spectran and SR5 for looking at these traits;
> they can be found at:
>
> http://www.weaksignals.com/
>
> http://www.ar5.ndo.co.uk/
>
> And there are a number of other programs out there as
> well and most are freeware.
>
> It is easy to get a good sense of IF filter passband
> flatness with these programs as well (assuming that
> the sound card you are using has flat response).
>
> Duane
> N9DG
>
>
> --- Steve N4LQ <n4lq@iglou.com> wrote:
>
> > To answer the SSB question. Here is a picture of
> > both rigs listening to band
> > noise on 80 meters without the NR turned on and with
> > the bandwidth at 1.8
> > khz.
> > Notice how the Omni VI's pattern is elevated off the
> > bottom of the chart.
> > This demonstrates the lack of low frequency response
> > of the TenTec filters.
> > Note the noise spikes kick up to about 3.5 khz on
> > the Omni but nearly 4.5
> > khz on the PRO.
> > The main thing to note here is the density of the
> > noise. The PRO's pattern
> > is almost solid blue while the Omni's is much less
> > intense. Also look at the
> > top pattern. The PRO III's signal is significantly
> > more intense.
> > Obviously, the Omni VI is going to be much easier on
> > the ears under these
> > conditions. Those big noise spikes come out sounding
> > like clicks on the PRO
> > but are hardly noticeable on the Omni.
> > Keep in mind....My PRO III is being checked out. It
> > could be defective. The
> > jury is still out on this one.
> > http://www.webham.com/ssb.jpg
> >
> >
> > Steve N4LQ
> > ----- Original Message ----- 
> > From: <KD7EFQ@aol.com>
> > To: <tentec@contesting.com>
> > Sent: Sunday, December 26, 2004 6:35 AM
> > Subject: [TenTec] Decision Made / Pro III / for N4LQ
> >
> >
> > > Hi Steve, the Pics are very interesting, and I
> > will follow your saga.
> > > However, being a
> > > 98% SSB op that rarely if ever gets narrower than
> > 1.8 in rough conditions
> > > (too much loss of fidelity at narrower bandwidths
> > for me), is a
> > > measurement at
> > > 250Hz CW bandwidth going to be something I notice
> > at 1.8 - 2.9khz
> > > settings?
> > >
> > > As I said, nothings happening until the QST, and
> > hopefully a Sherwood Eng.
> > > review.
> > >
> > > 73, Todd - KT0DD - kd7efq@aol.com
> > > "The race is over...THE RATS WON !"
>
>
>
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