Poul-Henning Kamp said:

You can use the power lines.

I remember a story from Dave Mills many years ago.  I tried to find it the
other day, but no luck.

His WWVB gear wasn't working -- fading out due to EMI.  He drove around
and found a factory that was spewing lots of trash.  I think it was going
out the power line.  The FCC wasn't interested.  Anybody else remember
that story?

A lot depends on how big an area you want to jam.  Cheap eBay GPS jammers
were intended to cover the receiver on a truck but at least one managed to
get an airport in New Jersey that was near a freeway.

I wonder how big an area a similar size and power unit for 60 or 100 kHz
would take out with various non-monster antennas.

--
These are my opinions.  I hate spam.

I co-authored an article on finding a GPS jammer.
https://www.gpsworld.com/the-hunt-rfi/

⁣___
Sent from my two-way wrist watch
73 de W3AB/George ​

On Nov 21, 2024, 21:57, at 21:57, Hal Murray via time-nuts time-nuts@lists.febo.com wrote:

I used to work at HP in the spectrum analyzer division in Santa Rosa, and
worked on the 8562 series of spectrum analyzers.  Soon after we released
the 8562A, we were somewhat surprised to see an employee purchase request
come through, from none other than David Packard!  Of course it is his
daughters that created and run the Monterey bay Aquarium and research
institute.  One of our engineers dug out an old HP model 200-B audio
oscillator (HP's very first product), and recorded the spectrum on the 8562
and saved it before shipping it with a nice note.  I wonder if that is the
8562 that is still being used by the Monterey Bay Research Institute?

-Bill Katz

On Fri, Nov 22, 2024 at 9:26 AM W3AB via time-nuts time-nuts@lists.febo.com
wrote:

Most illuminating on how difficult it was to find a unstable CW source at this frequency.  That indicated a DSS PRN source would be very difficult to correlate and find unless the PRN sequence could be identified (predicted) and used in a correlation receiver.  Or a multiple synchronous receiver system might be able to use cross correlation  across a local net to geolocate.

Lester B Veenstra  K1YCM  MØYCM  W8YCM  6Y6Y W8YCM/6Y 6Y8LV (Reformed US-NSG CTM1)
lester@veenstras.com

452 Stable Ln
Keyser WV 26726 USA

GPS: 39.336826 N  78.982287 W (Google)
GPS: 39.33682 N  78.9823741 W (GPSDO)

Telephones:
Home:            +1-304-289-6057
US cell          +1-304-790-9192
Jamaica cell:    +1-876-456-8898

-----Original Message-----
From: W3AB via time-nuts [mailto:time-nuts@lists.febo.com]
Sent: Friday, November 22, 2024 10:33 AM
To: Hal Murray via time-nuts
Cc: W3AB
Subject: [time-nuts] Re: UTC Backbone in Europe

I co-authored an article on finding a GPS jammer.
https://www.gpsworld.com/the-hunt-rfi/

⁣___
Sent from my two-way wrist watch
73 de W3AB/George ​

On Nov 21, 2024, 21:57, at 21:57, Hal Murray via time-nuts time-nuts@lists.febo.com wrote:

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com

Julie, David's daughter had the idea for the MB Aquarium. David and some of his engineers did G jobs for the aquarium's controls, which are impressive & still in operation.

David had the idea for MBARI, thinking it would be the research arm of the aquarium. However as they matured they realized that would not work though we, MBARI, collaborated with the aquarium on projects and sent live A/V via a full duplex m/wave link from the research vessel's ROVs to the aquarium via Mt Toro in Monterey. Visitors could watch the science in real time & ask the scientists questions.

We also built our own DGPS system since the CG's was unreliable in the bay. I also built a DGPS system on the APRS freq for hams, or anybody with a 2M RCVR, to use before WAAS became widely available.

As for the SA, I'm sure it has been long retired. We bought a lot of HP equipment.

I have a HP-200B I need to get rid of.

⁣___
Sent from my two-way wrist watch
73 de W3AB/George ​

On Nov 22, 2024, 10:31, at 10:31, Bill Katz billk@bbjj.org wrote: