[Elecraft] K3 Receiver Protection

[briana]

While you're in the programming mode, how about some preventative medicine.

Prevent one rig from switching to a band that the other rig is on.  If 
it tries, switch back to the old band.

73 de Brian/K3KO


On 6/1/2014 11:19 AM, Doug Person via Elecraft wrote:
> 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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>
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