[time-nuts] WWVB 60 kHz Loop Antenna Progress

[Brooke Clarke]

Hi Bill:

I'm interested in using the C-Max RF front end for a clock application 
where the time information is the goal, not like using the HP 117 for 
frequency/phase info.
http://www.prc68.com/I/Loop.shtml#CMMR6P60
http://www.prc68.com/I/117A.shtml

But if you live on either coast of the U.S. the WWVB signal is so weak 
clocks only sync around local midnight.  So the need for an antenna that 
has better pickup.
The current 131 turn 10x200 mm ferrits rod antenna is probably 20 dB 
better than the stock C-Max antenna.

Have Fun,

Brooke Clarke
http://www.PRC68.com


Bill Hawkins wrote:
> As I understand it, 60 KHz information is so slow that phase
> information is critical. Why would anybody use a resonant
> antenna in that situation? The phase shift from day to night
> is more than enough to work around.
>
> I used a non-resonant antenna proposed by John Ackermann
> against Z3801 outputs and got decent results, but not like
> comparing the Z3801 outputs against a Cs standard. John's
> antenna should be in the archives. Just 100 feet of RG-58
> wound on a 4 foot diagonal PVC pipe frame, with the shield
> split at 50 feet, IIRC. Tried resonating it, got unstable
> results.
>
> If you really must work with WWVB, I have a Spectracom 60KHz
> receiver and extras in a Tektronix rack or a Fluke 207 for
> sale at moving sale prices. I never thought there'd be any
> interest.
>
> Bill Hawkins
>
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Bob Paddock
> Sent: Tuesday, October 19, 2010 7:10 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] WWVB 60 kHz Loop Antenna Progress
>
> On Tue, Oct 19, 2010 at 7:16 PM, Magnus Danielson
> <magnus at rubidium.dyndns.org>  wrote:
>
>    
>> But then again, avoid the issue and go for a black hole antenna amplifier.
>>      
> I've been gathering information on Black Hole Antennas for a while on
> my web site:
>
> http://www.unusualresearch.com/Sutton/sutton.htm
>
> Anyone come across anything new?  Always did want to try one for 60 kHz.
>
>    

-- 
Have Fun,

Brooke Clarke
http://www.PRC68.com