Hi Jeff,
I have done that by comparing BAND DATA signals from both K3s using a
74HC688 8-Bit Comparator. When both BAND DATA signals are equal the P=Q
output from the HC688 disables transmitting on both K3s (TXinh). I used
the HC688 because I have decimal BAND DATA signals from my band filter.
If you want 12V logic or only need 4 Bit (BCD BAND DATA) you can use
CMOS 4063 (4-Bit Comparator) as well.
This circuit saved K3 frontend several times :-)
73, Win DK9IP
Am 01.06.2014 06:04, schrieb Jeff via Elecraft:
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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