HomeVideo
LF (Low Frequency) tests 2002-2005
Field Pics Quick Links: [ RF Work ] [ LF Work ] [ Lake Erie Rescue ]
  • LF experiments had started earlier than 2002 in places like the Nanticoke vault, Port Maitland vault and other places. Earned me a reception acknowledgement from american radio amateur John (W1TAG) on April 16, 2004.
Lake-bottom transmission distance record!!!!
Automated reception in Dain City on an untuned antenna (piece of wire). The transmitter was on the KJ feeding a 700-foot dipole at lake-bottom around 89G, some 80 Kms away (see above). The red ticks at the bottom are a minute apart, so the transmission event pictured here lasted about 20 minutes. The faint horizontal lines are Loran harmonics, we normally use these to calibrate reception equipment to accuracies of a tenth of a Hertz (Loran frequencies are very accurate).
Morpeth - hooked up to the plant cathodic protection rectifier - December 2002.
Morpeth vault. Connecting to the pipelines - April 2002.
Measuring antenna impedance around Long Point close to 89G - April 2005. MFJ impedance bridge sits on top of the 500Watt amplifier. Visible on the top right are the two leads of the 700 foot ground antenna.
Installation time for the 700 foot ground dipole - April 2005. The far ends of the dipole had to be grounded. Visible on lower left several 4 foot sections of copper pipe were bolted together to act as ground rods.
Active (amplified) reception loop submersible version - May 2005. Looking for buried pipelines... This was actually slowly dragged at the bottom
The loop on the boat - April 2005.
LF transmitter front - February 2005. The Hafler amplifier was purchased new, everything else made the hard way.
LF Transmitter innards - February 2005. Coils and torroids at the top, Hafler P400 amplifier in the middle, BIG 1000W test load resistor at left-bottom, PDL programmable frequency generator right-bottom.
Modified PDL board to act as computer-controlled frequency generator - February 2005.This is the unit at the bottom of the transmitter case in the previous picture.
Contact:
Copyright © 1991-2012 Adamg Last Update: Sunday, January 15, 2012 10:25:29 PM