[time-nuts] 60kHz Loop antenna

Alan Melia alan.melia at btinternet.com
Sun Oct 3 16:30:01 UTC 2010

The loop will be tuned (!) but hopefully to a freqency much above 60kHz by
the inter-turn and turn to screen capacitance. Also hopefully this will be a
low Q resonance and the phase frequency response at 60kHz should then be
stable with ambient conditions. Interestingly a lot of the modern LF and VLF
Off-air Standards use ferrite rod antennas and there are known problems with
those, Quartzlock advise a air loop for critical requirements.

Alan G3NYK

----- Original Message ----- 
From: "Arthur Dent" <golgarfrincham at yahoo.com>
To: <time-nuts at febo.com>
Sent: Sunday, October 03, 2010 5:09 PM
Subject: [time-nuts] 60kHz Loop antenna

> John-…”HP's loop for the 117A is not tuned, as I rember, but it
> is followed with a narrow band amp.“
> Both the nuvistor and FET versions of the loop show capacitors across the
loop winding to tune it.
> http://www.leapsecond.com/museum/10509a/
> -Arthur
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