[Elecraft] low-noise 40m RX antenna?

Tue Sep 17 11:21:00 2002

Wayne,
I am building up the PENNANT antenna for 160m receive. I think I will
find that this is a low noise antenna. It is quite small (for 160m) in
size in that it is only 29ft long by 14ft high and is directional. I am
about ready to go with it but have not been able to locate a type-43
toroid to wind a matching transformer. This toroid needs to be about
3/4-inch diameter. It also requires a 20-30 db preamp. Another feature is
that it can be low to the ground without much affect on its receiving
performance. You can find info on web sites by searching on PENNANT

73 de Jerry/k6iii
San Jose, CA
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Message: 33
Date: Mon, 16 Sep 2002 23:48:06 -0700
From: Wayne Burdick <[email protected]>
Organization: Elecraft
To: Elecraft <[email protected]>
Subject: [Elecraft] low-noise 40m RX antenna?

I recently had to erect a temporary random-wire antenna, thanks to the
less-than-skilled tree trimming that brought down my real one. The
stand-in is shorter and much closer to noise sources on my property. The
result is 1 to 2 more S-units of noise on 40 meters and some other bands.

Since the K2 has a separate RX antenna jack (on the K160RX module), I'm
thinking about putting up a low-noise receiving antenna for the low
bands. Unfortunately, to get enough wire for a Beverage antenna, I'd
have to sneak something along the fences in the power company easement
behind my house. This leads me to wonder about other possible low-noise
antenna solutions that might take less room (tuned loops, etc.). 40
meters is the band I'm most interested in.

Any suggestions? I think this topic might be of general interest for
weak-signal DX and QRP work on 40, but you seldom hear any discussion
about low-noise antennas outside of their application to 160 meters.

tnx
Wayne
N6KR