[Elecraft] HI RFI Message - what to do?

[Mel Farrer]

I like Bill's answer for a fixed multi-station setup.  Not good enough for a roughly controlled enviornment of FD. Or when a friend drives up to your house running a KW mobile. 

I think the bottom line is what the receiver front end was designed to "handle" and how much head room there is from that point to HI RFI message TO the point of failure of the front end device.  It would be nice to know these numbers.   But Alass, we are confronted with the age old saying, " when in doubt, protect thy self with back to back Hot carrier diodes on the receiver."  This doesn't mean this solution won't have possible intermod problems in fringe high RF enviornments of FD, but you won't lose a front end.  FWTW.

Mel K6KBE




--- On Mon, 6/29/09, Bill W4ZV <btippett at alum.mit.edu> wrote:

From: Bill W4ZV <btippett at alum.mit.edu>
Subject: Re: [Elecraft] HI RFI Message - what to do?
To: elecraft at mailman.qth.net
Date: Monday, June 29, 2009, 1:28 PM



Lee Buller wrote:
> 
> The K3 was on 7040 and the Orion was on 3520.
> 

A shorted 1/4 wl stub (~46' of Vf 0.66 coax) on the Orion 80m output would
have given ~30 dB of attenuation on 40m.  For best results stubs should be
tuned to exact resonance using an analyzer (most tell you how to do this). 
Plan ahead for next year!

http://www.k1ttt.net/technote/k2trstub.html

73,  Bill




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