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@mwt.net]
Sent: Tuesday, June 11, 2019 3:35 PM
To: Edward Sawyer; cq-contest@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@contesting.com] On Behalf Of Joe
Sent: Tuesday, June 11, 2019 1:01 PM
To: cq-contest@contesting.com<mailto:cq-contest@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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