Lance-A properly operating Pegasus receiver displays very little variation
in sensitivity from 80 to 12 M, with a slight degradation at 10 meters and a
few dB at 160. Unfortunately, I've only had the opportunity to evaluate one
Pegasus, so these numbers certainly aren't cast in stone. The specified
sensitivity for the Pegasus is 0.35 microvolts for 10 dB S+N/N, and I found
that my test unit came in just under this value at 20 meters, and it was 1
dB above spec at 10 M.
If you would like more information regarding the performance of the Pegasus
receiver, you might want to take a look at my review of the Pegasus that
appeared in the July and August issues of CQ. My lab tests went beyond
those executed by the ARRL in their review.
Above 20 M, the Pegasus employs two bandpass filters, one for 18-24 MHz and
the other for 24-30 MHz. These are simple filters, and I doubt that both
have a defective component. I'm assuming that your antenna is reasonably
well matched to 50 ohms, with minimal reactance on the bands that exhibit
low sensitivity.
I do not recommend that you adjust the IF gain pot in the Pegasus.
Adjusting this pot to increase the IF gain will improve the sensitivity
slightly, but it will also affect the analog AGC threshold, which could lead
to an increased propensity for "pumping" on strong adjacent-channel signals
when the band is crowded.
I hope this helps.
Scott
N7NB
-----Original Message-----
From: N2dmo@aol.com <N2dmo@aol.com>
To: tentec@contesting.com <tentec@contesting.com>
To: <tentec@contesting.com>
Date: Saturday, August 26, 2000 11:07
Subject: [TenTec] Pegasus upper band rec
>
>I have a general question for all Pegasus owner's or past owners. Loved
the
>radio, lots of great features, got good audio reports, all in all a great
rig
>for the price. Even liked it better than my Kachina, except for on area.
>
>The receiver went asleep above 20 meters. On 20 and below the receiver was
>good. On any band higher, the signals just were almost not there. I
>discovered this while looking for many of the DX stations on last spring.
>Using packet spots I would try and find the Dx station, or just the pile
up.
>On the Pegasus I could just hear them in there. On other rigs the signals
>were present, at different levels, but could be heard, much better.
>
>I have heard other people, who own the Pegasus say that they have noticed
the
>same thing.
>
>If anyone out there could come up with a good answer I would appreciate it.
>
>The other rigs in the house at the time were, a Icom 775, Icom 746, FT -
100,
>and a fully modified Sherwood Drake C-line. The antennas were either tuned
>flat for the band, or adjusted to the FREQ using a Palstar 4k tuner. The
>comparisons were done using a a 4 position Alpha Delta coax switch.
>
>Just wondering if it might of been just the Pegasus I had, or if it's
common
>to the rig. The reduced rec was more than just slight.
>
>From what I can tell, there seems to be no way to adjustments of that
nature
>to the Pegasus.
>
>I was thinking of buying another one, but am a little gun shy because of
this
>quirk.
>
>Thanks, Lance L k4wh@arrl.net
>
>--
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>
>
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