Part of the problem with comparisons of low band receiving antennas made in
various locations is that the composition of the ground under the antenna
makes a huge difference.
Chuck W5PR
On Mon, Feb 2, 2015 at 8:22 PM, Roger (K8RI) on TT <K8RI-on-TowerTalk@tm.net
> wrote:
> That's why I have the HB and Antenna HB on the same machine as the mail.
> Items, topics, and components are so much easier and faster to find than
> with hard print. Less than 10 keystrokes to find nearly any specifics on a
> topic. Course as some of my answers have shown, I'm too lazy to always
> double check!
>
> I can't say the computer is smaller, lighter, or cheaper at 60#, 23"H X
> 7.5"W X 20" D, running 8 64 bit cores/CPUs @ 4.1 GHz, & 16 GB of RAM and
> cost less than half our first color TV. OTOH the Internet has been a POS
> this past week, so I'm glad I had most of the data here. Still, with
> posted links on mans news groups, they came up invalid (err 404) even from
> news sites and some ham pages were taking so long to load they timed out.
> I don't think I was getting more than a fraction of the 100 Mbs service I
> pay for.
>
> Speaking of "pay for" and I think this is relevant to hams who depend on
> electricity... My electric use in the shop has been down this past year and
> on the equalized billing plan It almost doubled last month (with less use)
> I think I smell a rate increase a coming.
>
> 73
>
> Roger (K8RI)
>
>
>
> On 2/2/2015 2:14 PM, Jim Brown wrote:
>
>> On Mon,2/2/2015 10:05 AM, Don wrote:
>>
>>> First, I'm surprised there does not seem to be any published
>>> measurements taken at a common test site of a Beverage at various heights
>>> and lengths (such as done with yagi's, and other antennas on test ranges).
>>>
>>
>> Why do you assume that nothing like this exists? Beverages have been
>> around for nearly a century, and it is quite likely that there's a lot of
>> published work that you haven't looked for in scientific journals. It's
>> also possible to model antennas like this and do your own study. There's a
>> lot about Beverages (and other RX antennas) in the ON4UN book, and in the
>> ARRL Antenna Book.
>>
>> Email reflectors like this one should not be a substitute for pulling out
>> the books and studying them. Many of us who post answers to questions like
>> this have done that study, or done that modeling, or built those antennas,
>> and are sharing what we've learned. As VE7RF has noted, optimum height is a
>> function of wavelength. When a Beverage is higher than that, it doesn't
>> stop working, like throwing a switch, it just becomes less effective. My
>> 550 ft Beverages, a full wavelength on 160M, at an average height of 5-6
>> ft, are quite effective on 40M, and are still working on 20M! How do I
>> know? I run diversity with my K3 using the TX dipole at 125 ft into the
>> main RX and the Beverage into the second RX.
>>
>> 73, Jim K9YC
>> _______________________________________________
>>
>>
>>
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>>
>
>
> --
>
> 73
>
> Roger (K8RI)
>
>
> ---
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