[TowerTalk] Antenna swithcing system for M/S stations

[David Robbins K1TTT]

The wx0b sixpak has 6 inputs (one for each band) that can go to either one
of two outputs.  They are interlocked against putting both radios on the
same antenna.  You would not be able to have two stations on the same band
this way, but in m/s that is not something you usually want to do anyway.


David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
 

> -----Original Message-----
> From: towertalk-bounces at contesting.com [mailto:towertalk-
> bounces at contesting.com] On Behalf Of Yo3ctk
> Sent: Monday, October 03, 2005 16:59
> To: 'towertalk'
> Subject: [TowerTalk] Antenna swithcing system for M/S stations
> 
> I'm looking to build or buy an antenna switching system suitable for a M/S
> station. What I really need is some ideas about the configuration. Minimum
> requirements are:
> - 12 antennas
> - 2 transceivers
> - possibility to connect any to any
> - possibility to interdict some switching configurations, programmable
> - 1.5 kW capable
> 
> The main reason for requirement #4 is due to the fact that one of the
> antennas is a F12 C4XL, tribander+40m with two feeders. Obviously a
> configuration like RUN on tribander + MULT on 40m section is not possible.
> 
> I looked into the obvious configuration, a relay matrix 2 rows/12 columns,
> with some wired or programmed logic. The problem I see is due to 12 open
> contacts in parallel with a few picofarads capacitance each. I calculated
> an
> unacceptable crosstalk between RUN and MULT stations. Even with band
> filters
> in line, with one station transmitting and the other receiving, the
> interference will be enormous.
> 
> But maybe there are other solutions. Please let me have your thoughts.
> Thanks,
> 
> 73 de Mike, YO3CTK
> YR7M team
> 
> _______________________________________________
> 
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> any questions and ask for Sherman, W2FLA.
> 
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