Re: Re: Coax Switch between two rigs

Posted by Torsten Clay on Mar 03, 2006; 9:29pm
URL: http://elecraft.85.s1.nabble.com/Coax-Switch-between-two-rigs-tp387104p387115.html


> My measurements on ham grade coax switches show 40 dB or less isolation
> between positions.
>
> IN FACT, 60 dB is high even for a commercial grade switch.  The simple types
> from MFJ that are wires to a multiposition wafer switch do not shield quite
> long wire runs from the adjacent connectors.  Those are the long rectangular
> boxes with UHF jacks all in one row.
>

Really? I don't think switching two radios is as big of a deal as the comments
in this thread imply. After all, think of all the 100W transceivers where 100W of
RF is switched right next to very sensitive circuits (ie the receiver!).

I use two K2/100's and switch them to various antennas using an Array Solutions
SixPak switch. That switch has a measured isolation between radio ports of 80 dB:

http://www.arraysolutions.com/Products/sixpak.htm

I would generally trust measurements made by Array Solutions. Many other contesters use this or similar switches. I have no problem listening on another band while transmitting at 1500W on the other radio (unless I am too close to a harmonic).

Tor
N4OGW/5


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