A simple interlock can be built with a single quad XOR gate package,
half a dual 4 input NOR package and a few transistors/resistors if one
is driving the inhibit input. Add half of a quad NOR gate package if
you want to disable PTT.
73,
... Joe, W4TV
On 2014-06-01 10:54 AM, Joe Subich, W4TV wrote:
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
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