Here in upstate NY I have Fair-Rite FT-240 #31 cores on my RG6 receive
antennas - 8 turns. This spring when I did an inspection I saw that several
cores had split or had chunks out of them. Do the cores need to be protected
from the weather? I replaced the broken cores with the biggest clamp-on,
#0431177081, #31 ferrite with 8 turns. They are just lying on the ground.
Should I enclose them?
I made up four 3/4 wave length RG6 lines for my 80M 4-square. I used the
same biggest clamp-on ferrite with 8 turns at the feedpoint. Should I do
anything additional such as tie wrap them and/or enclose the ferrite?
73,
N2TK, Tony
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Ed K0iL
Sent: Sunday, June 18, 2017 11:20 PM
To: john@kk9a.com; rfi@contesting.com
Subject: Re: [RFI] Snap-on Ferrites
John,
Seems we can always get more turns around a toroid ferrite (several) than
you can on a snap on ferrite (maybe one). This would make snap-ons less
effective than a toroid core based on number of turns.
73, de ed -K0iL
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of john@kk9a.com
Sent: Sunday, June 18, 2017 9:44 PM
To: towertalk@contesting.com; rfi@contesting.com
Subject: [RFI] Snap-on Ferrites
I was reading the recent QST article RF Mayhem by WB8IMY. The author said to
avoid using snap-on ferrites for problems caused by HF signals as they
rarely work well at HF. It is best to stick with circular cores.
Is this correct? I was not aware that snap-ons were less effective.
John KK9A
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