I intend to do that. I probably will also test the resistor with and without a whip ... i.e., four combinations.
I don't expect a resistor to do as well as the AX1 because the AX1 is a partly reactive load that doesn't absorb energy like a resistor would, but we don't really know how lossy the AX1 is, do we. I just think that it might be an interesting comparison, and an actual measurement for the AX1 with and without a counterpoise most certainly would be interesting.
73, Dave AB7E On 9/25/2022 2:00 PM, [email protected] wrote:
If the signal in your AX1 test is significantly stronger with the counterpoise it would be interesting to also compare using a resistor vertical with counterpoise post as you previously posted. John KK9A
David Gilbert ab7e wrote: To be a proper comparison, the AX1 needs to be out it the clear away from anything else, preferable at a height that allows the counterpoise to be hanging straight down with the end maybe a foot or two off the ground. Measurements should be with the AX1 at the same height above the ground without and without the counterpoise. Ideally a KX2 or similar rig should used, be battery powered (with very short leads if external), no coax, and no body contact to the source of RF. Signal reports should be in microvolts ... the number of contacts isn't really useful and neither is SNR if the readings are taken over a lengthy period of time. If I can get my hands on an AX1, I plan to either climb a tree or set up a tall fiberglass step ladder for the AX1 as far away line of sight from my home as practical. I'd use my KX2 for the signal source, using the Tune function to put out RF without touching the KX2. Near my home I'd set up the portable vertical antenna I described in an earlier post, and feed that to my K3 set to read microvolts. I'd operate the AX1 (with and without counterpoise wire) and any other antenna for comparison, and have a friend record the microvolts from the K3 as a blind test. I would use the tuner in the KX2 to simulate actual use, but that would of course introduce a variable for possibly different amounts of loss in the tuner depending upon the load. I don't see a good way to avoid that. 73, Dave AB7E ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
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