[Elecraft] K3 Receiver Protection

[Joe Subich, W4TV]

> How are others using SO2R avoiding same band transmission and
> subsequent receiver damage?

SO2R controllers like the microHAM MK2R+ have built-in "same band"
interlocks that prevent PTT if both rigs are on the same band or
if one rig stops responding to control polling.  Some of the "contest"
software also prevents selecting the same band on both rigs.

I have not seen any dedicated hardware that compares "band data" from
the K3 or Yaesu rigs and opens the PTT lines or asserts the inhibit
lines if both rigs are on the same band but it would not be difficult
to do so with a PIC or even a programmable gate array.

73,

    ... Joe, W4TV


On 2014-06-01 12:04 AM, Jeff via Elecraft wrote:
>
> My station consists of two K-3's, each with a dedicated legal limit
> amplifier and SteppIr antenna. To minimize interference between bands
> I am using Array Solutions Bandpass filters. However, if both rigs
> accidentally wind up on the same band I run the risk of overloading
> the front end of the opposite rig and damaging the receiver (which
> I've done once...). Does anyone have a way of taking the band data
> information and disabling transmit capability on both rigs if they
> are on the same band? How are others using SO2R avoiding same band
> transmission and subsequent receiver damage? Anyone have any
> experience with the Array Solutions AS-RXFEP front end protector?
>
> Thanks, Jeff Larimore K0RG
> ______________________________________________________________
> Elecraft mailing list Home:
> http://mailman.qth.net/mailman/listinfo/elecraft Help:
> http://mailman.qth.net/mmfaq.htm Post:
> mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net Please help support this
> email list: http://www.qsl.net/donate.html Message delivered to
> lists at subich.com
>