[1000mp] Strange bahaviour on 80 meters

[Vidi & Hester]

Hi guys
I also have this problem from time to time, especially on 21mHz.  When I
first noticed it, it happened on 18mHz.  When switched to a dummy load the
problem was not evident, which made me think that it could be something
taking off causing  transmission out of  band limits, which explained high
swr on resonant antenna and good swr into dummy load.  I confirmed this by
listening around on an external RX - - - real rough spurious signal all over
the show.  Switching rig off and letting it get back its senses always
eliminates the problem and it would not happen again for months.  For this
reason I have not consulted Yaesu yet.

73
Vidi, ZS1EL


----- Original Message -----
From: "Joe Giacobello" <k2xx@swva.net>
To: <1000mp@mailman.qth.net>
Sent: Sunday, December 28, 2003 4:17 PM
Subject: Re: [1000mp] Strange bahaviour on 80 meters


> OK, Pete.  Well, Yaesu was clearly right:  the problem seemed to
> diminish in frequency when I changed amplifiers.  However, the problem
> manifested itself whether the tuner was engaged or not.  When I
> originally complained to Yaesu about the problem, they couldn't
> reproduce the behavior in their shop.  I had to send them a video tape
> of the unit misbehaving before they believed me, and then they
> conscientiously investigated the problem.  To their credit, they didn't
> charge me for their efforts.
>
> 73, Joe
>
> Pete Smith wrote:
>
> > At 10:46 AM 12/27/03 -0500, Joe Giacobello wrote:
> >
> >> ...
> >> However, even after Yaesu seemed to have solved the basic 15M SWR
> >> problem, the SWR would unpredictably go haywire periodically.  Yaesu
> >> worked on it again and concluded that the problem seemed to be
> >> associated with the amps that I was driving at the time: a vintage
> >> 30S1 and a Viking Thunderbolt.  When I replaced them with a TenTec
> >> Titan 425, my problems disappeared...for the most part.  I say for
> >> the most part because every now and then, totally without warning and
> >> for no obvious reason, the SWR will go haywire.
> >
> >
> > I haven't had the transient SWR problem with my Mark V, but after I
> > modified my SB-220 for QSK, I discovered that my TS-930 didn't want to
> > drive it without the tuner engaged on 10M.  Later, I got the Mark V,
> > and discovered a similar problem with the drive on 40M, which again
> > was cured by setting a single tuner memory and letting the radio
> > extrapolate from there.  It was fine on 10; in neither case did the
> > input SWR look THAT bad.
> >
> > I think Tom Rauch and others have commented that these older
> > amplifiers that were designed for tube exciters with adjustable pi
> > networks can be quite cranky with newer solid-state rigs, depending on
> > a lot of design variables.  I once tried to substitute a much shorter
> > input cable, and my TS-930 didn't like at AT ALL.
> >
> >
> > 73, Pete N4ZR
> > Happy Holidays
> > Check out the World HF Contest Station Database at
> >  www.pvrc.org/wcsd/wcsdsearch.htm
> >
> >
> >
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