RadioBanter - View Single Post

January 29th 06, 10:38 PM posted to rec.radio.cb

On Sat, 28 Jan 2006 21:42:48 -0500, wrote:

+On 24 Jan 2006 19:28:09 -0800, wrote:
+
+Im thinking of getting a 102" whip, I dont think I need the spring
+because of where im mounting it. But is it nessesary? Should I get it
+with the whip ?
+
+Here's another antenna test post I dug out of the archives.
+
+********************************************
+
+ I did this test a few years ago (minus the Wilson), at least as best
+I could. The problem is that when swapping the magmounts the
+position might change a little bit. If the position changes a little
+bit then the measured field strength may change a little bit also.
+Seeing how all of these antennas are very close to begin with
+then you have to wonder if the results may be off just a little bit?
+
+Anyway's, I did run the test and attempted to calibrate the results
+in db's . The calibration may be off a little bit, but the order from
+the best to the worst as I measured IS accurate.
+
+Radio Shack DLX magmount .................... 0db
+K-40 .................................................. ....... .8db
+Radio Shack 4.5' center load .................. 1.4db
+5' Firestik ................................................ 3db
+6.5" Hustler top load ............................... 4db
+108' Stainless Steel whip ........................ 4.5db
+7' Firestik .................................................. . 5db
+
+Of coarse since the time of this test I have found
+and measured even better antennas. Of these the
+practical ones all use large diameter masting made of
+highly conductive material. A large diameter, air spaced
+loading coil. This coil is always upwardly located and the
+overall antenna height
******
Were these antennae used as the transmitting or receiving antennae?
If transmitting antennae then what was the receiving antenna and
receiving equiptment. Second unknown is the path loss between the
transmiting antenna and the receiving antenna. Third item what was the
gain(dBi) of the receiving antenna. Without the above data, the above
results meaningless.

james