Irv Finkleman wrote:
Ralph Mowery wrote:
"John S" wrote in message
...
On 7/24/2015 9:11 AM, Ralph Mowery wrote:

I have measured dozens of them, all were out-of-band,
the ICOMs the KENWOODS the WEIERWEi and YAESu and and...



What method did you use to determin the frequency range of the rubber
duck
antennas ? I have several around here and may give it a try to see what
mine are.

Forgive me for inserting myself here. I just wanted to ask what equipment
you might have for making the measurements?


For starters a HP 8924C ( service monitor with tracking generator) , return
loss bridge, wattmeters.

I just have not tried the rubber duck antennas to see what frequency I think
they may be for.


If the rubber ducky is measured by itself, it may not show
resonance at the right band of frequencies, however I wonder if
it uses the handheld case as part of the system, in which case
measurements might change to the anticipated range.

Just a wild guess.

Irv VE6BP

Using a RigExpert AA-1400 on various VHF and UHF antennas, what I have
found is that lack of a counterpoise of some sort has a major effect
on impedance and a minor effect on resonant frequency.


--
Jim Pennino