[TenTec] Pegasus TX problem redeux

[Jeff Griffin]

One more thing, I thought I might measure the current now at 13.8 volt's on
all bands once again  with N4PY's S/W set to 20 watts out....

160 to 20m  8 amps  1 watt out
17 to 10m 22 amps 0 watts out

N4PY S/W set to 100 watts out...

160 to 20m 7 watts out, 18 amps

All into a good dummy load. Things are getting worse! Now not getting full
power out on good bands, was last night.

73 Jeff kb2m


----- Original Message ----- 
From: "Jeff Griffin" <kb2m at comcast.net>
To: <tentec at contesting.com>
Sent: Thursday, May 22, 2003 7:24 AM
Subject: Re: [TenTec] Pegasus TX problem redeux


> Thanks for the info Duane. The relay's are switching(clicking) as I switch
> bands. And appear to be working properly, or just as you described. I also
> noticed today that the heat sink get's very warm when the Peg is turned
> on(on any band) and not transmitting. I just measured the current, while
> idling, it's pulling 7.5 amps at 13.8 volts. It's going to be a rainy
> weekend here on the eastcoast, and I'm off for 4 days, looks like I have
> found something to do!
>
> 73 Jeff kb2m
>
> ----- Original Message ----- 
> From: "Duane Grotophorst" <n9dg at yahoo.com>
> To: "Jeff Griffin" <kb2m at arrl.net>; <tentec at contesting.com>
> Sent: Thursday, May 22, 2003 12:26 AM
> Subject: Re: [TenTec] Pegasus TX problem redeux
>
>
> >
> > --- Jeff Griffin <kb2m at comcast.net> wrote:
> > >   I'm having a strange problem with my Peg. I
> > > noticed that it wouldn't transmit on 17 to 10
> > > meters, even though the red tx light was on, but no
> > > RF. 160 to 20 meters transmitted FB.
> >
> > Can you tell if the low pass filter relays are
> > clicking like they should be when you go to those
> > bands that do not work?
> >
> >  I was testing
> > > this morning to see if the Peg was pulling current
> > > even though it wasn't putting out RF. I set the
> > > power out to 20 watts or so I found that it is
> > > pulling 18 amps or so,but not putting out any RF on
> > > the bad band's.
> >
> > There is no way it should draw 18 amps when set for 20
> > watts output, - unless perhaps there is a real bad SWR
> > situation. If the low pass filters are not switching
> > in properly this could account for both the high
> > current draw and no output.
> >
> >  On the good band's it is putting out
> > > 20 watts or so into a dummy load and pulling about 7
> > > amps. All with a carrier mode. I was surprised to
> > > note that for a time  the problem existed only on 12
> > > and 10 meters! 17 and 15 meters were  working. A few
> > > week's ago it started working on all band's, then
> > > went back to 160 to 20 meters. Does anyone have a
> > > clue as to what might be going on?
> >
> > This would be consistent with a low pass filter
> > switching problem, 10 & 12 meters use the same low
> > pass filter and 15 & 17 meters share another. Since
> > these bands are paired you will not hear any relay
> > switching between 10 and 12 meters or when switching
> > between 15 and 17 meters.
> >
> >  What I'm looking
> > > for is a single point of failure in the 10m to 17m
> > > area of the band pass filter, but then I remember
> > > that it also worked for a short time on 10/12m AND
> > > 160/20m! I'm having trouble reading the schematics
> > > as I don't have a very clear copy of them.  Now it
> > > is transmitting on 160 to 20 meters again. I just
> > > took it apart and looked for cold solder joint's,
> > > didn't find any.  Thanks in advance, for any useful
> > > suggestion's.
> >
> > From what your describing I don't think it will be a
> > "single point" of failure but I think your on the
> > right track. If you haven't already you may also want
> > to take a close look at the pin/header connection/area
> > from the main board to the low pass filter board.
> >
> > Duane
> > N9DG
> >
> >
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