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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