To All,
This is a very interesting subject!!
I am setting up my new M/S station and planning to
use stubs and a WX0B SixPak. I have all equipment
going to a single point ground using 3" wide copper strap.
What are the big guns (M/M, etc) doing in this regard???
Please pass along any further information on the subject.
Many Thanks and 73, Ted K2QMF
On Fri, 1 Aug 2003 17:03:55 -0400 "Dallas Carter" <ludal@dmv.com> writes:
> Mike,
>
> It's virtually impossible to evaluate your problem from the
> description
> of
> your hookup. It is very possible that you are suffering from common
> mode
> RFI. I would do some experimenting with the ground system to see if
> I
> could minimize the paths. I had to abandon my "single point ground"
> and
> bond the interstation bus to ground rods behind each operating
> position,
> Others have had good results by using ground isolators on all of
> their
> incoming RF lines.
> I will probably get a lot of flack about my comment on single
> point
> ground,
> but just keep in mind that when using modern day equipment, there is
> no such
> thing. Where do you think that green wire goes?. For a quick test,
> ground
> the
> receive antenna on your test radio and see if you don't get really
> loud
> harmonics.
>
> 73 and good luck,
>
> Dallas W3PP
>
> Subject: [CQ-Contest] Testing Stubs
>
>
> > I have just recently tried using the Top Ten stub box (double
> stub) and my
> > own homebrew stubs (and stub switching box) on my main CQ radio
> and am
> > puzzled by the ineffectiveness of both. I obviously must be
> doing
> something
> > wrong but can't figure it out.
> >
> > The set up is radio-ICE 419-amplifier-LPF-wattermeter/sensor-stub
> > box-wattmeter-WX0B 6 pack box-manual antenna switches -antennas.
> I also
> > have a 419 in the receive loop on the second radio.
> >
> > The LPF and wattmeter/sensor are connected to amp using right
> angle
> > connectors and the stub box using 10' of supplied RG-214.
> >
> > The test setup is transmitting on 3510, 7010 or 14010 and
> listening on the
> > 2nd, 3rd, etc., harmonic on the second radio. 20 and main 40
> meter
> antennas
> > are on the same tower but all the other combinations are on
> different
> > towers. What I am finding with this setup is no change in s
> meter
> reading
> > on the second radio listening on the harmonics when I switch the
> stub box
> > in/out.
> >
> > Thanks,
> >
> > Mike W9RE
> >
> > ---------------------------------------------------------------
> > The world's top contesters battle it out in Finland!
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>
> ---------------------------------------------------------------
> The world's top contesters battle it out in Finland!
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> http://home1.pacific.net.sg/~jamesb/
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>
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