This would be a good place to use an Arduino. If the serial ports of
the K3s are available, it would only take a small bit of code to achieve
this.
Doug -- K0DXV
On 05/31/2014 10:46 PM, Don Wilhelm wrote:
Jeff,
That is a logic question seeking an answer. I don't know of a simple
solution, but it is a matter of selecting a match of the outputs of 2
band data decoders. If any two are the same, assert TX INH to both K3s.
That function could be implemented with a number of NAND gates or XOR
gates at the outputs of the 2 band decoders. The exact implementation
of the logic gates is "left to the student", there are several
possibilities, but it would take a number of external logic gates to
implement.
If you are really into logical devices, you could program a chip to do
that directly from the band data outputs - if all 4 of the outputs
from both K3s are a match, assert TX INH to both transceivers.
I do not know of an existing device that will provide that function,
so the implementation would have to be created 'from scratch'. Yes,
it is possible, it is just a matter of "a few logic gates".
73,
Don W3FPR
On 6/1/2014 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?
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