[Lowfer] SAQ 'extra transmission' in CT

[jrusgrove at advancedreceiver.com]

Jim

Here's probably more than you want to know but I received several inquiries on the details of the 
setup. Some OTs on the list may have read all this before ...

The e probe here http://www.w1vd.com/modifiedeprobe.pdf  is mounted in an aluminum enclosure ... 
there is an FM broadcast station about 2000' away that gets into unshielded e probes. It's mounted 
10' above ground on a PVC pipe and there are 8 radials that slope down from the aluminum enclosure 
at about a 45 degree angle. These end about 1' off the ground. The feedline from the e probe to the 
dc injector http://www.w1vd.com/Eprobedcinjector.pdf at the base of the mast is RG-400 double 
shielded coaxial cable. Double shield is required at this location to completely remove effects of 
the FM broadcast station.

The DC injector is connected to a single ground rod next to the PVC mast and receives power from a 
small solar panel / battery mounted on a separate mast close by.

About 130' of RG-58 runs from the dc injector to the shack where there is another isolation 
transformer - just like the one in the DC injector located outside. The RG-58 is not grounded at 
either end but lays does lay on the ground for the entire length.

The e probe is located in the corner of an open area about 150' x 300'. There are 60 foot trees on 
both sides of the corner that are about 20' from the e probe. The best location for the antenna 
(minimum noise)was determined walking around the property using a battery powered receiver / e probe 
setup. It's definately worth the effort to do this as there are 'sweet spots' where noise is lowest. 
Capturing enough signal at VLF / LF is seldom a problem with any reasonable antenna ... noise 
reduction is the key to obtaining the best s/n ratio.

This may seem like 'going to heroic means' but at this location it's what's required to get to the 
natural noise floor over the entire frequency range - 8 kHz - 30 MHz.

Jay W1VD