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February 2011

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Mon, 28 Feb 2011 22:19:33 +0100
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Thanks, Shawn,

I've just got some copper wire which  I will stretch along the attice. Want 
antenna on inside, easier to do experiments. Nothing that disturbes the 
field, I hope. How would a Cushcraft R8 vertical multiband antenna be? 
Advantage: needs little space.

Inge


----- Original Message ----- 
From: "Upton, Shawn" <[log in to unmask]>
To: "Inge" <[log in to unmask]>; <[log in to unmask]>
Sent: Monday, February 28, 2011 8:55 PM
Subject: RE: [TN] NTC: GEC BRT 400S


If I'm following the thread correctly, this is a receiver.  If so, then
just hook up wire--as a receiver it will not care so much about
resonance and such.  A dipole would work better, but really, a long wire
and a good ground--or another wire acting as a ground--should allow
reception.  If you're not sure if the rig is working, I'd just hook wire
up directly to it, get it receiving, then start worrying about better
antennas--but quite a bit can be received on a simple few meters of
wire.

Multi-band dipoles do work, although the 40m antenna should work
reasonably well for the 15m element, due to harmonic relationship.  I
believe 80 and 20 will do likewise.  But I have done this sort of thing,
but with inverted L's not dipoles.  Just make sure to fan the legs out
(look up "fan dipole" as this is what you are proposing to build).  For
straight receive I probably would not use a 1:1 balun, I like choke
baluns better for feeding coax, especially for broadband unspecified
impedance.

Shawn Upton, KB1CKT
Test Engineer
Allegro MicroSystems, Inc
[log in to unmask]
603.626.2429/fax: 603.641.5336

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
Sent: Monday, February 28, 2011 2:41 PM
To: [log in to unmask]
Subject: Re: [TN] NTC: GEC BRT 400S

Thanks all for help.
I'm making a spider antenna (Rothammel), 6 beams
10 m = 2x2.5
15 m = 2x2.38
20 m = 2x5.05
40 m = 2x10.1
80 m = 2x19.8 m
Will rig it in the attic with a 1:1 balun and RG-82 double shield down
to
the input and north-south direction. A multiband dipol with other words.
What do you think? I've no idea about the Q and VSWR, nor Za

Inge



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