f requency(MHz) = 300 / wavelength(meters)
This won't work if there is an obvious helical-wound wire under heatshrink on a fiberglas whip. Most CB and some 4-30Mhz Ham antennas are made that way. They are much shorter than a quarter wavelength....
Measure the length of the whip antenna in meters and multiply by four. Then use the formula
as a first approximation assuming that the whip antenna is designed to be a 1/4 wave vertical antenna.Code:f requency(MHz) = 300 / wavelength(meters)
True, but the OP did not mention those things. We can assume anything we want, but that doesn't mean it has any relevance whatsoever. He said wip[sic.] antennas with no mention of loading colis or helical wound wires -- sheeshThis won't work if there is an obvious helical-wound wire under heatshrink on a fiberglas whip. Most CB and some 4-30Mhz Ham antennas are made that way. They are much shorter than a quarter wavelength.
Sheesh yourself! The OP is not the only person who reads these posts. Did you ever think that perhaps what I posted might be useful to the 50 or so other readers of this thread!True, but the OP did not mention those things. We can assume anything we want, but that doesn't mean it has any relevance whatsoever. He said wip[sic.] antennas with no mention of loading colis or helical wound wires -- sheesh
The only other thing he mentioned was bench testing and I think he got that answer.
Except what you posted was a qualitative description of things that might be. No mention was made of how to analyze them if they were there. I'll let the other 50 readers weigh in on the usefulness of your post.Sheesh yourself! The OP is not the only person who reads these posts. Did you ever think that perhaps what I posted might be useful to the 50 or so other readers of this thread!
Hey PapaBravo.Except what you posted was a qualitative description of things that might be. No mention was made of how to analyze them if they were there. I'll let the other 50 readers weigh in on the usefulness of your post.
In my opinion these are antennas designed for use on a vehicle and for frequencies somewhere in the range of 2 to 30 MHz. Amateur HF comes to mind, and perhaps CB 27Mhz. It is difficult to say exactly what frequency bands though. In general, the longer the antenna and the greater the number of turns of wire, the lower the frequency. That long one with the many many turns of wire seems to be for the lowest frequency (perhaps 14 or 7 MHz?). When we see the coil pitch change dramatically in a short distance, this might indicate a design for multiple bands.I have photo's of the three aerial's The longest aerial is 2.360 ,
the middle one is 1.750 and the solid wire is 1.310 Meters long an I have photo's of the base area of the aerial's. I have placed a sketch of the long aerial to show what is at the base
I hope this helps.