[K3PZN-List] FD Antenna Lessons Learned (we hope ....)

[wo3l]

The co-band interference is one of the reasons I have advocated a max of 1 multi mode station per band. The difficulty is that makes the radio setup a little more complex as you have to accomodate modes you may not operate much or at all.


Sent from my Galaxy S®III

-------- Original message --------
From: Curt Milton via K3PZN-List <k3pzn-list at mailman.qth.net> 
Date:06/02/2014  21:14  (GMT-05:00) 
To: Carroll County Amateur Radio Club <k3pzn-list at mailman.qth.net> 
Subject: Re: [K3PZN-List] FD Antenna Lessons Learned (we hope ....) 


Well I only know this because we learned the hard way!  


FD is a bit unusual since we do multiple modes at the same time on the same bands - so even the multi-multi contests typically don't have this problem.  


Likely the PVRC gang has this down pat ... I have heard things like them arranging all the beams in a straight line, but separating antennas on the same band is essential because each transmitter, no matter how clean it is, outputs broad band noise within the operating band.  


I also brought this up as when our FD chairs assigns bands/modes per shelter -- we can't have two transmitters sharing the same antenna space on the same band.  Hence we can't co-locate 15m SSB and 15m CW for example.  


A plan will emerge as the operation and its operators emerge.  Where is everyone else?  Ok back to some RTTY action .... 


73 Curt



On Monday, June 2, 2014 5:36 PM, Ray Wright <kb3vwk at gmail.com> wrote:



Thanks Curt you guys have way more experience in knowing what will work and
what will not. I plan on bring all the mast the club has stored here and we
can assemble what is needed and what is not and leave the rest on the
trailer.  We will be bringing the RV and 6x6 with eagle one for eye
catching but probably not needed for operations.   As always thank you all
for any information you can help me with

ray




On Mon, Jun 2, 2014 at 1:54 PM, Curt Milton via K3PZN-List <
k3pzn-list at mailman.qth.net> wrote:

> A few other notes to the team from last year's experience:
>
> (1) At the KB3VWK shelter we were SUCCESSFUL in sharing ONE mast between
> 20m SSB and 40/15m CW.  An inverted V for the latter was hung not many feet
> below the Yagi.  The rigs (FT-3000 and K2) coexisted without any
> interference.  Getting two stations on ONE mast highly successful.
>
>
> (2) I remember 3 rigs last year in the K1RH shelter -- but I don't
> remember how many masts or how they shared them?
>
>
> General rule #1 -- with decent-enough rigs we can share masts if they are
> on DIFFERENT bands.
>
>
> (note if we instead host 15m SSB at KB3VWK we won't be doing 15m CW there
> ....)
>
> (3) Unfortunately yours truly located the two big Yagi antennas much too
> close together last year.  As we wished to use them for CW and SSB on the
> same band at the same time, the result was not pretty.  We need greater
> separation between the Yagis (or even wire antennas for that matter) that
> would operate on the same band.  Whatever that spacing was I think we
> should aim to double it.  (Maybe someone has intel from another large
> operation on what works here?)
>
> (4) One operator insisted in having his own mast .... I remember this
> resulting in a couple extra masts to erect.  (not fun -- read by traffic
> with Larry).  The 80m SSB was strung between those masts as I remember.  I
> can't remember how we deployed the wire for 40m SSB ?
>
>
> FD without trees .... is this called uncivilized or what ??  Ok its part
> of the emergency operations exercise to deal with what you have.
>
>
> CUL maybe I am done thinking about FD for this year's operation.
>
>
> Curt
> ______________________________________________________________
>
> 73 de K3PZN Westminster, MD
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