Gary wrote on May 21.
I've had a Wellbrooke loop for a few years at 20' on a TV rotator. It
nulls a single nearby QRN source NW at 300 deg true. EU is about 15-30 deg
from here. When 160 or 80 are open over the N Pole, it often helps me hear
the weak.
It's less effective on multi-source QR
I think that 31 material is probably a good choice for cleaning RF from
wiring that isn't handling RF power and where there isn't much in the way
of
shunt impedance for the choke to work against -like a line from an
electricity meter carrying a much as 480 VAC (530 VAC at 480 high-line).`
That
All good and valid points, Tom! Thanks!
Regards,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI
Sent: Wednesday, May 22, 2013 9:35 AM
To: Charlie Cunningham; topband@contesting.com
Subject: Re: Topband: Thanks!
> I think tha
On 5/21/2013 9:42 AM, Tom W8JI wrote:
31 materials has a Q of about 1 on 80 meters. This means a good part
of the impedance is resistive.
Not quite.. A strong resistive component is present only around
resonance, and the resonance of a single pass through a #31 or #43 core
is in the range of
On 5/21/2013 1:18 PM, ZR wrote:
Are you now claiming that the thousands of bead choke baluns in use
for decades at HF and 6M dont work?
I have published extensively on this, first in 2005 in a peer reviewed
AES paper, and later in my RFI tutorial. All of this work is on my
website. W1HIS pub
