[VHFcontesting] 6m Coax Stubs

[Bart Jahnke]

All,

Following on Kenny's thread, I have excess to my needs one BUD LF-601
filter available to anyone who wants to try it - say $30 shipped?

73 Bart W9JJ



On Fri, May 5, 2017 at 10:24 AM, Kenneth Silverman <kenny.k2kw at gmail.com>
wrote:

> Thanks for all the replies - many were direct to me.  There was a range of
> answers from:  my 2m mast mount PA gets slammed, to I have the antennas
> stacked 5' apart and there's no issue with legal limit.  For filtering,
> some used low power band pass filters before the amp, some used HP BPF's
> after the amp, and one person used a stub.
>
> It turns out one of my group has an ICE 6m 3KW BPF which I will use after
> the 6m amp, and we have 2m BPF too.  We figure that should do the trick.
>
> While I was researching the issue, I ran into the following which may be of
> use:
> Bud Radio Inc variable low pass filter LF-601 or LF-601-A, which is rated
> at 1KW AM and factory set to cutoff after 33 MHz.  There are some on Ebay
> right now.  If you have a network analyzer, these should be easily retuned
> to cut off after the 6m band, which will suppress the 6m 3rd harmonic into
> 2m
>
> 73, Kenny K2KW
>
> On Wed, May 3, 2017 at 11:35 AM, Kenneth Silverman <kenny.k2kw at gmail.com>
> wrote:
>
> > Has anyone successfully used coax stubs on the output of the 6m amp to
> > suppress 3rd harmonic interference into the 2m station (M/M station)?  If
> > so, did you use a single or double stub?
> >
> > The antennas will be on separate masts, spaced about 40' apart, and 6m
> > will run about 700w.  In most cases the antennas will side to side and
> > roughly pointed in the same direction, but the beamwidth of the 6m
> antenna
> > is wide enough where the 6m antenna could be pretty much looking into the
> > (side) of the 2m antenna.
> >
> > Many thanks, Kenny K2KW
> >
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