[Elecraft] K3 Receiver Protection

[Doug Person via Elecraft]

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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