This is typical of Peg/Jupes. It is also on transmit but usually not
noticable unless the signal is super strong like S9+30db. You can see
the phase noise on the ARRL expanded report. It's many db down from the
carrier but still higher than most rigs. It seems to originate in the
first conversion stage, 45mhz or whatever. Also I've noticed some rigs
have it worse than others. On Pegasus's it sounds "hissy" and on some
Jupiters it sounds raspy. Years ago when the Peg was introduced I bought
one and the 45mhz osc. was microphonic. You could modulate the carrier
by tapping on the cabinet! I got a few T8 reports and shipped it back to
TT. After 2 weeks, they concluded that they all sound that way. I got a
prompt refund. Recently I tried another one, much newer. No sign of the
same trouble and rather clean carrier. Your mileage will vary on these
rigs.
Steve N4LQ
-----Original Message-----
From: "Toby Pennington" <toby423@earthlink.net>
To: "Ten Tec List" <tentec@contesting.com>
Date: Wed, 11 May 2005 14:35:20 -0400
Subject: [TenTec] Phase Noise on Jupiter
> I hate to change the subject of getting ripped off on the auction
> sites. But I have been playing recently with several Jupiters and
> notice that there is a phase noise interjected on cw signals,
> expecially the stronger ones. This is on receive only.
>
> I read in the archives a thread about this in 2001 but never could find
> a conclusion or a fix for the problem. Turning down the RF gain or
> engaging the ATTN does not seem to help.
>
> Some would call this a raspy cw note. Moving the power supply away
> from the rig doesn't help any. Is there an answer for this
> characteristic of the Jupiter, or is it just something a Jupiter
> owner just has to enjoy.
>
> Toby W4CAK
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|