[time-nuts] Choke Rings and Points North
kb8tq at n1k.org
Wed Dec 17 07:36:19 EST 2014
> On Dec 17, 2014, at 1:07 AM, Chuck Harris <cfharris at erols.com> wrote:
> I would venture that the extent of the magic was to note the physical
> center of the array, and call that the phase center.
> As long as you always orient the antenna in the same direction, any
> errors that might exist in the real phase center will be consistent,
> and could be corrected for by noting the offset from a benchmark.
I’m afraid that’s what they do as well. Just spin it and see what a dial indicator reads sort of thing. I think that I’d want something that actually did some microwave tests ….
> -Chuck Harris
> Bob Camp wrote:
>>> Inquiring minds surely are in high gear!! And to think, all I wanted to know
>>> was how close I needed to to point to north!!
>> The need to point north is a legitimate question. There is a chance that they
>> designed some magic into it to deliberately shape the response.
>> Based on the analysis done so far, you have to wonder just how they set up to
>> check these things for phase center. Given the money you pay for them, I would
>> hope they have a definitive test. Getting back an answer like “some guy named Bob
>> did some math” in response to a request for traceability would be a major downer
>>> Dave M
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