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Advice on antenna length
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 |
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