[Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Mike K2MK]

There are a couple of things to think about. How much power are you running?
How close is the receive antenna to your transmitting antenna? Does your
receive only antenna possibly have an interface that can connect to the key
out of the K3? (My Pixel Loop antenna has such a device)

You can also try it out and listen for a clicking noise from the carrier
operated relay inside the K3. It is a protective relay that will energize if
it sees too much power coming in on the RX antenna input. If you hear it
clicking then it is a good idea to consider additional protection.

There are external protective devices available that you can purchase. DX
Engineering and Array Solutions have them I think there are others out
there.

http://www.dxengineering.com/search/department/antennas/section/receive-antennas-and-arrays/product-line/dx-engineering-receiver-guard-5000-electronic-rf-limiters?autoview=SKU&N=4294953330%2B4294951218&sortby=Default&sortorder=Ascending

http://www.arraysolutions.com/Products/as_rxfep.htm

73,
Mike K2MK


Elecraft mailing list wrote
> I ordered the sub receiver and in the conversation with Elecraft I was
> informed that it is good idea to build a device that would short the
> dedicated RX antenna to ground to protect it during transmit.
> The simple way would be a relay but I'd rather not hear a relay click with
> each transmission.
> I was wondering what others are using to accomplish this.
> 
> Thank you





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