[Elecraft] K3 Receiver Protection

[Joe Subich, W4TV]

> If the serial ports of the K3s are available,

They tend not to be when doing SO2R - the logger has them tied up.
Of course if the Arduino is capable of handling four 38,400 bps
ports at the same time one can pass the logger data through the
device.

73,

    ... Joe, W4TV


On 2014-06-01 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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