[Elecraft] RX antenna protection

[Richard Fjeld]

I just read Ignacy’s post telling that the K3 receive ant input has a RF activated relay.  I’m glad to see that.

Rich, n0ce


From: Richard Fjeld<mailto:rpfjeld at outlook.com>
Sent: Tuesday, August 15, 2017 12:00 PM
To: Bob McGraw K4TAX<mailto:rmcgraw at blomand.net>; elecraft at mailman.qth.net<mailto:elecraft at mailman.qth.net>
Subject: Re: [Elecraft] RX antenna protection

I haven’t been following this, and just noticed it, so I hope I am in sync with this.

Just a note to say that years ago, I had a B&W Electronic Antenna Switch (I think it was called) that had one or two tubes in it.
It worked perfectly to bias the receive completely and immediately as soon as transmit was detected.  It allowed full break-in for CW work.  I would like to see something like this again today in solid state.  I think this would be the ticket for what you need. I haven’t looked, so I don’t know if anyone is marketing such a device.

Rich, n0ce

From: Bob McGraw K4TAX<mailto:rmcgraw at blomand.net>
Sent: Tuesday, August 15, 2017 11:00 AM
To: elecraft at mailman.qth.net<mailto:elecraft at mailman.qth.net>
Subject: Re: [Elecraft] RX antenna protection

See page 63 of the manual.  Also page 70 under Receive.    "*HI RFI*
warning:"

RFI DET - *NOR *enables detection of high RFI at the antenna in receive
mode.  (see HI RFI warning. *Troubleshooting*). Set to OFF to disable
the warning.

73
Bob, K4TAX
K3S s/n 10163


On 8/15/2017 9:50 AM, john at kk9a.com wrote:
> Great question! I asked the same thing once and never got an answer so to
> be safe I either short the RX antenna during transmit or if SO2R I use DXE
> receiver guards. It would be nice if the K3S had a similar built in
> protector.
>
> John KK9A
>
> W1PEF wrote
> Mon Aug 14 21:48:29 EDT 2017
>
> I am considering a Rx antenna but my property is small and concerned about
> strong signals over powering the receiver. Does the K3S have built-in
> protection?
> Does anyone use a loop receive antenna or BOG antenna ... would like some
> recommendations from actual users of receive antennas.
> Have the complete K-Line and would like to improve my ability to hear.
> Thanks for any advice...
> Paul
> W1PEF
>
>
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