[Lf] Re: [Lowfer] Loran... Need 100Khz reference or WWVB

[George Lemaster]

Ham Radio, March 1976, page 28, "WWVB Signal Processor"  provides a counter
reference with various timebase taps. The receiver includes a loop antenna
with regenerative preamp and limiter, followed by a zero-crossing detector
to provide a 60KHz squarewave, then a string of counters for the counter
timebase input. (The WWVB signal is amplitude modulated 10dB to send the
time data.) There are much more complicated ways to obtain the 60Khz signal
with reduced noise, but this may be adequate for ham purposes.

Ham Radio, March 1988, page 45, "Frequency Calibration using 60KHz WWVB"
describes another receiver and using a scope to compare your signal
generator to WWVB.

Articles by R.W. Burhans in 73 magazine, "If You Want to Know Where Your
Are" part 1, April 1978,  and part 2, page 146 (not sure what issue)
describe building a simple Loran-C receiver for frequency standard
calibration. Part 2 has the receiver schematic and countdown. Not a complete
solution, but might give some ideas.

73
George
WB5OYP

----- Original Message -----
From: Bob Roehrig <broehrig at admin.aurora.edu>
To: snet <paulc at snet.net>
Cc: <lowfer at qth.net>; <lofexp at egroups.com>; lf-amrad <lf at amrad.org>
Sent: Sunday, February 13, 2000 6:03 PM
Subject: [Lf] Re: [Lowfer] Loran... Need 100Khz reference or WWVB


>
>
>
> I would vote for WWVB, if you can receive it well enough. LORAN is no
> doubt stronger but the problem is the emission is pulsed. You would need
> to come up with a phase locked circuit very similar to the AFC
> control in a color TV set - one that only needs a small signal sample
> to stay in lock. AT least WWVB is a steady carrier.
>
>                     "Nostalgia is a thing of the past"
>     E-mail: broehrig at admin.aurora.edu or k9eui at arrl.net   73 de Bob, K9EUI
>             CIS: Data / Telecom   Aurora University, Aurora, IL
>                       630-844-4898  Fax 630-844-4222
>
>
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