Timothy Coker n6win73 at gmail.com
Mon Jul 2 04:12:38 PDT 2012

A hardware interlock makes it physically impossible for two transmitters to
transmit at once. A software interlock, as programmed in to many contest
programs, does the same but cannot account for the use of VOX or internal
DVR messages. So a hardware interlock is what one should use to 100%
prevent the possibility having more than X number of signals on at once.
The interlock is not a switch because it's function is to act as a blocking
gate to whomever might accidentally try to put an extra signal on the air.

I am not sure of how one uses a switching device in the context of that
rule though. Obviously the switch can't be competitive an antenna selector
because most groups would have had at least a couple wires, if not yagis,
running to the same radio that needed selecting (switching). The rule must
refer to something a bit off the wall that some might do?


Tim / N6WIN.
On Jul 2, 2012 12:57 AM, "Dino Darling" <dino at kx6d.com> wrote:

> I need some education here. 2012 Field Day Rule #4 says "no switching
> devices..." My first reaction was a "switch" and an "interlock" were the
> same thing. Since I'm ignorant of the old WRTC rules and the history of
> "switching devices" used in Field Day (or any other contest), I thought it
> best to ask as I'm always open for an education and history lesson!
> Here is Field Day Rule #4...
>         *
> "4. Entry Categories:
> *
>   Field Day entries are classified according to the maximum number of *simultaneously
> *transmitted signals, followed by a designator indicating the nature of
> their individual or group participation. Twenty (20) transmitters maximum
> are eligible for the purpose of calculating bonus points  (2,000 points
> maximum). However, additional transmitters may be used simultaneously in
> determining your entry category. *Switching and **simulcasting devices
> are prohibited."*
> **
> Thanks!
> Dino - KX6D
> -------- Original Message --------
> Subject: [SCCC] N6WIN 2012 ARRL FD 1E LP
> From: Timothy Coker <n6win73 at gmail.com>
> Date: Sun, July 01, 2012 9:19 am
> We decided that we would make this a multi-single 1E entry using two K3's
> at
> N6WIN's home QTH. We would use two K3's with interlock hardware (old WRTC
> style) to test our teamwork skills.

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