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[time-freq] TADD-1 Bandpass Filter

Mike Suhar msuhar at woh.rr.com
Wed Jul 14 03:23:34 UTC 2010

John will have to tell you if that number was from an actual measurement or
formula.  Best to wind one and measure it.  With that said however, you may
want to skip the BPF.  I don't know your application, but for my purposes I
have never installed the filter.  I am feeding reference inputs to such
devices as HP 8657A, 3586C, 5335A, etc. 


-----Original Message-----
From: time-freq-bounces at tapr.org [mailto:time-freq-bounces at tapr.org] On
Behalf Of Eric Lemmon
Sent: Tuesday, July 13, 2010 22:12
To: time-freq at tapr.org
Subject: [time-freq] TADD-1 Bandpass Filter

I am finally building my TADD-1 Distribution Amplifier kit, but I am
confused about the hand-wound inductors used in the bandpass filter option.
The TADD-1 instruction manual states that for 10 MHz, the nominal value
should be 14.5 uH, which can be achieved with 27 turns of #24 wire on an
Amidon T-50-2 core.  However, Amidon's inductance charts on page 1-24 of
their catalog shows that more than 50 turns are needed to reach that
inductance on a T-50-2 core.  The inductance table shows that 27 turns on a
T-50-2 core will result in less than 5 uH.  Am I missing something here?

73, Eric Lemmon WB6FLY

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