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Re: [IRCA] Antenna Projects (Crate Loop) MORE QUESTIONS
Dave (and others),
Looking again at that C-V365-X3, it appears as if each gang is 365pf fully
meshed. The website is vague. So, that won't work for fine tuning. Sorry.
Try something like BC12332 http://www.oselectronics.com/ose_p96.htm which
should give slightly better fine tuning depending on the gangs you switch
in. Kevin's method in his article seems to be the best way to go for fine
tuning.
73, Chris
-----Original Message-----
From: irca-bounces@xxxxxxxxxxxxxxxx
[mailto:irca-bounces@xxxxxxxxxxxxxxxx]On Behalf Of Chris Knight
Sent: Thursday, January 08, 2009 10:38 PM
To: HASCALL, DAVID CIV DFAS; irca@xxxxxxxxxxxxxxxx
Subject: Re: [IRCA] Antenna Projects (Crate Loop) MORE QUESTIONS
Dave,
EBay has been a pretty good source for wire. I usually buy spools of 1000'
or less and dedicate some of them to antenna projects and others for
Beverage Antennas, etc.
An observation on "fine tuning": You'll notice the 0-365pF single gang
capacitor is "touchier" when less capacitance is needed at the higher BCB
frequencies. As you tune the loop for stations under 700kHz it becomes
easier to tune and a lot less touchy. So, what I've done in the past is use
a multi-gang capacitor such as the C-V365-X3 available at Antique Electronic
Supply http://www.tubesandmore.com/ for $26.96. You can tie 2 of the gangs
together in parallel and switch them in using a toggle-type switch or you
can switch each gang in individually as needed using 2 switches. This gives
each gang the full tuning "range" of the capacitor. Hence, you get better
fine tuning.
73.
Chris
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