Check out "Observations on Ferrite Rod Antennas", QEX, 2008. Type 61 works
better at low frequencies regardless of manufacturers guidelines.
-----Original Message-----
From: "Charles P. Steinmetz" <charles_steinm...@lavabit.com>
Sender: time-nuts-boun...@febo.com
Date: Sat, 17 Mar 2012 12:01:36
To: Discussion of precise time and frequency measurement<time-nuts@febo.com>
Reply-To: Discussion of precise time and frequency measurement
<time-nuts@febo.com>
Subject: Re: [time-nuts] WWVB BPSK Receiver Project? (fwd)
gary wrote:
>OK, assuming type 61, it is 0.1%/deg C.
IME, Type 78 is the usual choice for resonant antennas below 200 kHz
(tempco of initial permeability = 1.0%/deg C). I have seen Type 33
used for broadband LF/MF antennas (tempco of initial permeability =
0.1%/deg C). Type 61 is generally not used below 200 kHz.
Best regards,
Charles
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