[TenTec] Pegasus 20 meter power
Jim FitzSimons
cherry@neta.com
Sat, 5 Aug 2000 22:55:35 -0700
This is a multi-part message in MIME format.
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Gene, some RF could be getting into the computer and causing the problem =
you described. A good ground always helps. At 14MHz 17.5 feet of wire is =
an=20
open circuit. Wires much shorter are inductors and not grounds. You =
could get=20
one of those artificial ground tuners if the ground is a problem.
I am lucky, my station ground is a piece of metal 3 feet by 6 feet under =
my=20
equipment connected buy a 3 foot wire to a metal wall which is part of =
my=20
metal house. I tied the metal wall to a copper water pipe that runs =
under=20
my house.
Even with a low Q tuner like the 238, high VSWR can cause resonance
out of band that the finals do not like to see. What is the VSWR with =
the tuner
switched out? If it is very high then you are looking for trouble. If =
you could=20
drive the open wire line direct from the tuner or put a 2:1 balun in =
between the
coax and the open wire line, it would be better.
Best regards, Jim FitzSimons W7ANF
-----Original Message-----
From: EUGENE W WINDSOR <k4sdv@QuixNet.Net>
To: tentec@contesting.com <tentec@contesting.com>
Date: Saturday, August 05, 2000 4:54 PM
Subject: [TenTec] Pegasus 20 meter power
=20
Anyone Have any Ideas?
=20
I have a Pegasus 550, Power supply 961, and a Brand new off the line =
Model 238 Tuner. I have tied a ground bus from the power supply to the =
transceiver and to the tuner, which is run through the wall to the tower =
ground. I also tied the bus to the AC ground.
With the tuner I can tune to full power (100 watts) with a 1/1 vswr on =
80m, 40m, 15m, & 10m, I'm using a G5RV Antenna with a co-ax transition =
to ladder cable up the tower to the inverted V antenna.
=20
Now on 20 meters with a 1/1 VSWR as I increase power, still with a good =
match 1/1, I come to point of 60 watts and suddenly the power drops to =
40-45 watts the Frequency read out goes from red to white, ( not =
transmitting ) and the Pegasus pumps up & down and when I try to hit =
tune it will not active until I drag the power to about 35 Watts or turn =
OFF the power to the Pegasus. Vswr still reading 1/1.=20
=20
The only thing now I can think of that the ACL tone is adjust too high =
on 20 meters.
=20
73,
=20
Gene / K4SDV=20
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<DIV><FONT color=3D#000000 size=3D2>Gene, </FONT><FONT color=3D#000000 =
size=3D2><FONT=20
color=3D#000000 size=3D2>some RF could be getting into the computer and =
causing the=20
problem </FONT></FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2><FONT color=3D#000000 size=3D2>you =
described.=20
</FONT><FONT size=3D2>A good ground always helps. </FONT><FONT =
size=3D2>At 14MHz=20
17.5 feet of wire is an </FONT></FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2><FONT size=3D2>open circuit. =
</FONT><FONT=20
size=3D2>Wires much shorter are inductors </FONT><FONT size=3D2>and not =
grounds.=20
</FONT><FONT size=3D2><FONT size=3D2>You could get =
</FONT></FONT></FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2><FONT size=3D2><FONT size=3D2>one of =
</FONT></FONT><FONT size=3D2><FONT size=3D2>those artificial ground =
tuners if the=20
ground is a problem.</FONT></DIV>
<DIV>
<DIV>I am lucky, my station </FONT><FONT size=3D2>ground is a piece of =
metal 3=20
feet by </FONT><FONT size=3D2>6 feet under my </FONT></DIV>
<DIV><FONT size=3D2></FONT><FONT size=3D2>equipment connected =
</FONT><FONT=20
size=3D2>buy a 3 foot wire to a metal wall which </FONT><FONT =
size=3D2>is part of my=20
</FONT></DIV>
<DIV><FONT size=3D2>metal house. I tied the </FONT><FONT size=3D2>metal =
wall to a=20
copper water pipe that </FONT><FONT size=3D2>runs under </FONT></DIV>
<DIV><FONT size=3D2>my house.</FONT></DIV>Even with a low Q tuner like =
the 238,=20
high VSWR can cause resonance</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT><FONT size=3D2>out of band =
that the finals=20
do not like to see. What is the VSWR with the tuner</FONT></DIV>
<DIV><FONT size=3D2>switched out? If it is very high then you are =
looking for=20
trouble. If you could </FONT></DIV>
<DIV><FONT size=3D2>drive the open wire line direct from the tuner or =
put a 2:1=20
balun in between the</FONT></DIV>
<DIV><FONT size=3D2>coax and the open wire line, it would be =
better.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2>Best regards, Jim FitzSimons =
W7ANF</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><B>-----Original =
Message-----</B><BR><B>From:=20
</B>EUGENE W WINDSOR <<A=20
href=3D"mailto:k4sdv@QuixNet.Net">k4sdv@QuixNet.Net</A>><BR><B>To: =
</B><A=20
href=3D"mailto:tentec@contesting.com">tentec@contesting.com</A> <<A=20
href=3D"mailto:tentec@contesting.com">tentec@contesting.com</A>><BR><B=
>Date:=20
</B>Saturday, August 05, 2000 4:54 PM<BR><B>Subject: </B>[TenTec] =
Pegasus 20=20
meter power<BR><BR></DIV></FONT>
<DIV> </DIV>
<DIV style=3D"POSITION: absolute; TOP: -20px; Z-INDEX: 5; RIGHT: 0px">
<OBJECT classid=3Dclsid:06290BD5-48AA-11D2-8432-006008C3FBFC=20
id=3Dscr></OBJECT></DIV>
<DIV><FONT size=3D2>Anyone Have any Ideas?</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>I have a Pegasus 550, Power supply 961, and a =
Brand new=20
off the line Model 238 Tuner. I have tied a ground bus from the =
power=20
supply to the transceiver and to the tuner, which is run through the =
wall to the=20
tower ground. I also tied the bus to the AC ground.</FONT></DIV>
<DIV><FONT size=3D2>With the tuner I can tune to full power (100 watts) =
with a 1/1=20
vswr on 80m, 40m, 15m, & 10m, I'm using a G5RV Antenna with a =
co-ax=20
transition to ladder cable up the tower to the inverted V =
antenna.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Now on 20 meters with a 1/1 VSWR as I increase =
power, still=20
with a good match 1/1, I come to point of 60 watts and suddenly the =
power drops=20
to 40-45 watts the Frequency read out goes from red to white, ( not =
transmitting=20
) and the Pegasus pumps up & down and when I try to hit tune it will =
not=20
active until I drag the power to about 35 Watts or turn OFF the power to =
the=20
Pegasus. Vswr still reading 1/1. </FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>The only thing now I can think of that the ACL tone =
is adjust=20
too high on 20 meters.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>73,</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Gene / K4SDV
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