Posted by
Kent Tiburski on
Jun 10, 2012; 6:28pm
URL: http://elecraft.85.s1.nabble.com/K1-no-power-out-B2-tp7557347p7557425.html
Thanks Bob!
I actually did that and added those snap-on ferrite cores. I cleaned up
things a lot! I'm starting to think that there may be other things going
on. I took the advice of others that replied. Things such as using a dummy
load, no problems. I put the amp in STBY and when running 100 watts thru it
the VSWR was less than 1.5 to 1 and forward power was 100 watts (indicated
on the amp). I put the dummy load on the other end of my run of coax and it
was fine. Even with the extra balun and ferrite cores me thinks that it's
either the length of the coax or I have the antennas too close to the shack.
My 6 meter yagi is laterally about 30 feet from the rig/amp and the R8 about
36 feet.
Anyone else have any ideas? Thanks!
73, Kent, K6FQ
-----Original Message-----
From:
[hidden email]
[mailto:
[hidden email]] On Behalf Of Bob
Sent: Sunday, June 10, 2012 10:59 AM
To:
[hidden email]
Subject: Re: [Elecraft] KPA500 Issues
The R-8 is a radial-less vertical. Unfortunately it has a tendency to put
all sorts of RF down the coax as the "counterpoise" system is too short
given the wavelengths involved.
You might want to buy a heavy-duty coaxial choke from DX-Engineering like
the
http://www.dxengineering.com/Parts.asp?ID=1474&PLID=166&SecID=81&DeptID={112
450B5-E9E3-4F36-9166-E52FA128D019}&PartNo=DXE%2DFCC050%2DH05%2DA<
http://www.
dxengineering.com/Parts.asp?ID=1474&PLID=166&SecID=81&DeptID=%7B112450B5-E9E
3-4F36-9166-E52FA128D019%7D&PartNo=DXE%2DFCC050%2DH05%2DA>
I used a R8 for years and had trouble even with 100 watts of power. I can't
imagine how bad it would be at 500 watts. Your station ground is going to
have to be top notch if you want to avoid trouble.
Good luck!
73, Bob, WB4SON
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