[Antennas] Best 'no radials' HF vertical?

2002年8月16日 06:15:18 -0400

Jim;
You have the answer: Hy-Gain AV-640 has NO Traps!
I bought the AV-620 when Ameritron produced the first batch (SN: 002)
before we knew Hy-Gain was being purchased by MFJ Enterprises. My reason:
No traps. three years later no complaints. Works by the book. See
www.wbow.com for a great price.
Good luck,
Jim, K4SQR

On 2002年8月15日 21:05:43 -0700 "Jim Shaw" <[email protected]>
writes:
> Because verticals with 'no radials' are sometimes an emotional topic, 
> I have
> been hesitant to ask for feedback on them. However, due to a 
> sudden
> decrease in my already limited space for antennas, I am now 
> seriously
> contemplating the acquisition of a 'no radials' vertical antenna in 
> order to
> remain on the air until I can move to a new QTH with more space. 
> Hopefully,
> I can obtain a vertical that covers all bands, including WARC, from 
> 40 thru
> 10 M and will take the full legal power limit.
>> From what I can tell, there are three commercial possibilities: 1) 
> the
> Cushcraft R8, 2) the Hy-Gain AV-640, and 3) the Hy-Gain DX-77A. In 
> order to
> familiarize myself with what kind of performance I might expect, I 
> obtained
> the publication "HF Vertical Performance Test Methods and Results" 
> by N0AX
> and K7LXC published in 2000 and obtainable via
> http://www.championradio.com/forsale/ . This report compared the 
> Cushcraft
> R8 'no radials' vertical to the Butternut HF6V, MFJ 1798, Force-12 
> ZR-3,
> Diamond CP-6, Hustler 6BTV, Force-12 V-3, and Gap Titan. In 
> addition, from
> my own personal experience, I've used the Cushcraft R-4 (the very 
> first
> commercial 'no radials' HF vertical?) as a 'backup' antenna for 
> nearly 15
> years.
>> I had pretty much settled in on the R8 because, among other things, 
> it uses
> fewer traps than the Hy-Gain DX-77A. Also, its 'counterpoise' 
> elements are
> only 4 feet long thus I could install it in a space no wider that 9 
> feet by
> 9 feet. However, recently, I noticed that Hy-Gain now offers a new, 
> 'no
> radials' vertical' - the AV-640. This new AV-640 not only has 'no 
> radials',
> it also has 'no traps'! I downloaded the manual and found that it 
> contains
> a nice 'theory of operations' discussion and the design makes a lot 
> of sense
> to me. But, I'm no expert on this topic.
>> So, assuming you were limited to putting up a single 'no radials' 
> vertical
> and wanted to operate high power on 40 thru 10 M, which one of these 
> three
> verticals would you choose and why? Or, is there a better 
> alternative
> possible within my limited space that I have not considered?
>> 73 de Jim [email protected]
>> - - - 
>> Your moderator for this list is:
> Larry Wilson KE1HZ [email protected]
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