View Single Post
  #2   Report Post  
Old February 3rd 07, 02:33 PM posted to rec.radio.amateur.antenna
Cecil Moore Cecil Moore is offline
external usenet poster
 
First recorded activity by RadioBanter: Jul 2006
Posts: 1,614
Default Advice for 75m Mobile Field Strength measurements

k1drw wrote:
Any suggestions offerred to assist with this effort will be sincerely
appreciated.


Palomar manufactured a PFS-1 Field Strength Meter
for awhile. You might be able to find a used one.
It works very well in the absence of other strong
signals.

But you can take advantage of what is known already.
A 75m hamstick is 12 dB down from a good center-
loaded bugcatcher or screwdriver. That's at least
2 S-units and maybe more. Hustler systems are 8 dB
down, more than one S-unit. One S-unit can make or
break an emergency communications.

Anyone serious about 75m emergency communications
should replace those dummy loads (hamsticks) with a
real antennas. :-) A well-designed, well-installed
bugcatcher or screwdriver system is hard to beat
on 75m.

Here's my 75m mobile antenna guaranteed to beat
the socks off of a hamstick:

http://www.w5dxp.com/mobscrew.jpg

It is a High Sierra HS-1600 with the optional RV
bottom section. It has a top hat with eight radials
two feet above the coil. The top hat is at a
height of about 10.5 feet above the ground. Watch
out for trees.
--
73, Cecil http://www.w5dxp.com