[time-freq] TADD-1 Bandpass Filter

[Mike Suhar]

Yes the BPF will take the harmonics out of a square wave giving you the
fundamental.   

-----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 23:42
To: 'TAPR time and frequency projects'
Subject: Re: [time-freq] TADD-1 Bandpass Filter

Mike,

Thanks for the response.  If I use my ThunderBolt GPSDO as a source, I
certainly won't need the filter since it has a sine wave output.  As I
understand John's comments, the bandpass filter has value if the source is
not a sine wave; I don't think it matters what the loads are.  I was
planning to install the components anyway, even if I jumpered around the
filter during initial operation.

73, Eric Lemmon WB6FLY
 

-----Original Message-----
From: time-freq-bounces at tapr.org [mailto:time-freq-bounces at tapr.org] On
Behalf Of Mike Suhar
Sent: Tuesday, July 13, 2010 8:24 PM
To: 'TAPR time and frequency projects'
Subject: Re: [time-freq] TADD-1 Bandpass Filter

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. 

Mike

-----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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