Message-ID: <001501c49bc4$56bb0950$0a03210a@Hugh>
From: "Hugh M0WYE" <m0wye@thersgb.net>
To: rsgb_lf_group@blacksheep.org
References: <001c01c49b55$09f086a0$6507a8c0@Main>
Date: Thu, 16 Sep 2004 09:07:30 +0100
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Subject: LF: Re: LF Components
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Alan said:
>
> 38-2670  Ferrite rod 20mm diam by 150mm long, this is really a "bulked up"
> aerial rod !! I dont know what they are for but there are 6 slots along 
> the
> length...could it be to reduce eddy currents ?? I dont think they are
> intended for a winding. I haven't looked at the permiability yet, but I
> guess they might be better than using a "bundle" of smaller rods, as I do 
> in
> a 35mm diam solenoid. One thought is that it would be easy to trap a drive
> cord in them for a permiability tuned inductor.
>
MMG-Neosid, describe these rods "fluted", although they don't do them as 
large in diameter as 20mm. They are sold as "Antenna Rods", but no 
explanation is given in the catalogue for the flutes. When I tried using 
ferrite rods at high power, i.e. TX not RX, I found that the ferrite heated 
up directly under the windings, the flutes might help reduce this.

73
Hugh M0WYE