Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]

LF: Re: Screening an LF Loading Coil

To: <[email protected]>
Subject: LF: Re: Screening an LF Loading Coil
From: "Alan Melia" <[email protected]>
Date: Sun, 10 Apr 2016 17:04:03 +0100
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btinternet.com; s=btcpcloud; t=1460304194; bh=KDFA0oIWjOr6LbYIpwVCySFuNw9QW6nYNVcZOP1tz44=; h=Message-ID:From:To:References:Subject:Date:MIME-Version:X-Mailer; b=RYspbi18mLUVjaxaXkRqDtzYrFI9L+parGmzmqyMQ71OafJ8e4Hjesjc+2Z+Xf1EtE91ZdMnGhfBUyBXsAdXuclV2xZpG0Q4+QH/t+bdozEh/AHsQQjV3HJr3GprQGG4Z8YpdkvCYLZ0OJmEcXeo+QU9DCne8DumvOeJ5CXC+h8=
References: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Hi Hugh I think the rule of thumb (or at least the one I use) is that the lowest turn should be at least half the coil diamter from the screen base (which if too close will exhibit the properties of a shorted turn) and the diameter of the screen should be at least twice the diameter of the coil....more is better, but.......

I think that should be OK with your coil size supported in the middle of the keg, Hope you had the pleasure of emptying it :-))

Alan
G3NYK

----- Original Message ----- From: "LineOne" <[email protected]>
To: <[email protected]>
Sent: Sunday, April 10, 2016 4:50 PM
Subject: LF: Screening an LF Loading Coil


A few years ago I found an aluminium beer keg which had been used for mixing cement. As it was damaged it was no good returning it to the brewery so I have just moved my LF loading coil into it and placed the assembly outside on a corrugated steel roof. (Having the coil suspended from the shack ceiling was not a good idea for the long term).

I took the end off the keg, which is 370mm internal diameter, and the coil is on a 130 mm former, likely to be no more than 160mm diameter wound. The antenna is predominantly current fed so no voltage larger than about 3kV is present.

Has anyone tried this and am I likely to lose radiated power by reducing the Q of the coil, the Tx output voltage and current are just the same?

Hugh, M0DSZ



<Prev in Thread] Current Thread [Next in Thread>