[CQ-Contest] Reciever Protectorr

[Edward Sawyer]

Joe,  The Passband filters are really for close in overload rejection of radios on different bands.  They don't protect in the technical sense.

If the spacing of the stations is at least 150 ft and you are using 100W radios, tip to tip on yagis pointed in the same direction (typical of field day) my experience is that you don't need this protection and it won't help cut down in band interference.

If you do use them, you either have to run receive only antennas and feed it into the rcv port or you need a solid state T/R relay and feed the R into the rcv port through the protection circuit.  Honestly, I have only seen that done with KW stations, not 100W stations.

I did over a decade of SO2R and in band 2 radio with good separation and never needed them.  Bandfilters for sure.

73

Ed  N1UR

From: Joe [mailto:nss at mwt.net]
Sent: Tuesday, June 11, 2019 3:35 PM
To: Edward Sawyer; cq-contest at contesting.com
Subject: Re: [CQ-Contest] Reciever Protectorr

I'm thinking for Field Day.

We have the Passband filters for out of band strong stuff.  But they don't help protect front ends from in band sigs like Phone station CW station Digital station all on the same band.

Thinking this might help.

Joe WB9SBD
On 6/11/2019 2:13 PM, Edward Sawyer wrote:

Joe, I use one going into the RCV antenna port of my FT1000MPs.  I often use beverages with dual radio same band (160 - 40) and this type of product insures no blown receiver front end.



73



Ed  N1UR



-----Original Message-----

From: CQ-Contest [mailto:cq-contest-bounces at contesting.com] On Behalf Of Joe

Sent: Tuesday, June 11, 2019 1:01 PM

To: cq-contest at contesting.com<mailto:cq-contest at contesting.com>

Subject: [CQ-Contest] Reciever Protectorr



A unit like this.



https://www.dxengineering.com/search/product-line/dx-engineering-receiver-guard-electronic-rf-limiters?autoview=SKU&keyword=receive%20protector&sortby=BestKeywordMatch&sortorder=Ascending



Has anyone made it so it can work with a tranciever? Think like weak sig VHF/UHF folk do with remote preamps?



Joe WB9SBD





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