[NLRS] Anybody have experience with multi-band feeds?

[Matt Burt]

David,

I have not read all of the material that you listed here but for the  
long haul stuff we tend to do in this part of the country most folks  
use loops for each band up through 3456.  I have done it many times  
and it works great when using a 432 antenna to liaison with that is  
pointed pretty darn close to the microwave band antenna.  You can get  
away with having the loops pretty close together without too many  
problems.

The only multiband feed that I have is 5760 and 10GHz.  That seems to  
work well with my 60cm dish on both bands but is still both difficult  
to haul in the rover.  While the thought of building a simple rover  
station seems seductive it can be frustrating for a fixed station to  
work you at some distance without a decent signal produced from the  
quality gain of the mono band loop arrangement.  For 902 through 10Ghz  
more gain tends to always be better.

That's my my two cents worth.  Glad to hear that you are thinking  
about roving for the UHF test.  More rovers is better there too!  Good  
luck


73,

Matt
KF0Q


----- Message from thepalmhq at gmail.com ---------
     Date: Thu, 3 Feb 2011 18:02:01 -0600
     From: David Palm <thepalmhq at gmail.com>
Subject: [NLRS] Anybody have experience with multi-band feeds?
       To: NLRS List <nlrs at mailman.qth.net>, Badger Contesters List
<badgercontesters at mailman.qth.net>

>
>
> I have been corresponding a bit with WA5VJB about the use of one of
his
> log-periodic yagis as a multi-band feed for a dish.  (He actually
> recommends  using one of his newer Vivaldi PCB antennas, which he
says
> should be a bit easier to connect and a bit more efficient in this
role.)
>
> I realize that this is at best a compromise solution on every band,
but it
> is extremely attractive to me for a rover set-up to be able to use
the same
> dish from, say, 2.4 - 10 GHz.  I was thinking that I'd try to build
a loop
> yagi for 2.4 GHz and try using the multi-band dish on 3.456 MHz and
up (if I
> get the equipment working in time.)  But you get the drift.
>
> I've read the article that Paul Wade, W1GHZ wrote about this (
> www.w1ghz.org/antbook/conf/WA5VJB_LPA_feed.pdf) and the two
take-aways from
> that were that 1) it should work and 2) it seems best to optimize
the system
> for the highest band and then just take your lumps on the rest.
>
> I'm wondering if anybody has any experience on this that they could
share?
> I'm interested in having something ready for the August contest and
am
> starting to plan now.  If you have other suggestions for multi-band
antennas
> for the rover, I'd be very interested to hear your suggestions.
>
> 73,
>
> David  W9HQ
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----- End message from thepalmhq at gmail.com -----