[VHFcontesting] 6m Coax Stubs

[Jeff Goldman]

I guess there is a demand for the filter.  Somewhere in the garage I also have one - - not sure if its a LF-601 or the LF-601A, but I’ll sell my filter for $30 shipped as well.

73,
Jeff, K3DUA





> On May 5, 2017, at 10:47 AM, Bart Jahnke <bjahnke at gmail.com> wrote:
> 
> That was fast - the filter has been sold...
> 
> 73 Bart W9JJ
> 
> On Fri, May 5, 2017 at 10:31 AM, Bart Jahnke <bjahnke at gmail.com> wrote:
> 
>> 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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>>> 
>> 
>> 
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