[Lowfer] Receiver protection

[ve3ot.mp at gmail.com]

Hi Paul:
Looking at solution for that problem myself, as limits my transmission capabilities...and I'm particularly worried about blowing out the front end of the SDR Perseus.
Right on time (today) I received August QST..."Versatile Transmit/Receive Switch and Active Antenna" page 30.
To quote"..a versatile solid state TR switch that allows you to connect your SDR -or any receiver-to your main antenna‎....."
I can see that it would act as an isolation device, protecting your RX from the significant voltages present at your QTH....( an automatic desensor? ).
It might provide a start point for your requirements.
73
Mitch VE3OT

Sent from my BlackBerry 10 smartphone on the Bell network.
  Original Message  
From: N1BUG
Sent: Tuesday, July 10, 2018 8:04 AM
To: rsgb_lf_group at blacksheep.org; rsgb_lf_group at yahoogroups.co.uk; Discussion of the Lowfer (US, European, & UK) and MedFer bands; 600MRG at mailman.qth.net
Reply To: Discussion of the Lowfer (US, European, & UK) and MedFer bands
Subject: [Lowfer] Receiver protection

Does anyone have ideas for receiver front end protection at LF and
MF? I am worried about my TX signal damaging receivers.

Of course the best idea is to disconnect the RX antenna from the
receiver while transmitting. Any good solution while leaving it
connected?

Now I have a pair of back to back 1N4148 diodes across the receiver
front end but I don't think this offers real protection because they
allow too high voltage before conducting. Also there is a preamp
after the didoes which can bring the RF to dangerous levels!
(Somehow nothing was damaged during last winter operating this way... :)

73,
Paul N1BUG

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