RadioBanter - View Single Post - tnom's 1/4-wave whip design parameters

January 28th 06, 04:06 PM posted to rec.radio.cb

On Sat, 28 Jan 2006 02:59:50 -0500, wrote:

+On Fri, 27 Jan 2006 19:35:16 -0800, Frank Gilliland
wrote:
+
+
+Good design:
+
+One inch silver pipe
+
+ |-- top
+ |
+ |
+ |
+ | 102"
+ |
+ |
+ |
+ |-- bottom
+
+
****

Is this silver pipe solid or plated. If solid it is a waste of
material and silver. Thick silver plating will suffice.

Besides diameter of the whip only affects tuning and not radiation
pattern.

+
+Bad design:
+
+Small diameter Stainless steel whip
+
+ |-- top
+ |
+ |
+ |
+ | 102"
+ |
+ |
+ |
+ |-- bottom
+
+
+
+You can't make your point so you misrepresent. Like I said before.
+You have never shown any reason for me to believe anything other
+ than you being dishonest.
+
+I have corrected your assumption.
**********

Stainless steel is a higher resistive material and affects the skin
effect resistance of the antenna. The increase in radiation resistance
does not affect matching but will have a minor affect both receiving
and transmitting properties of the antenna at CB frequencies. At low
microwave frequencies it is a non usable material.

Nickle will do the same thing. My experience with work on small
receiving antennae at 900 MHz and nickle plating over beryllium copper
was a dissaster. Receiver sensitivity degradation was very easily
measured. Quite repeatable.

james