[50mhz] 50mhz Digest, Vol 65, Issue 24

Sat Jun 27 12:40:28 EDT 2009

Hi Lance

How did you arrive at the following gain figure for the HyGain
 HyGain VB-66DX        1.21    8.97  7.35  6.04 14.45  11.80  11.37  5.51 
4.53  13.01  11.37  10.98     37.7   1.12:1
The advertisement says 12.5 dbi which is approximately 10.3 dbd and the boom 
is 27 ft 6 element.I was planning to buy this antenna, so I am curious where 
you got the numbers.Best Regards
Dan Schaaf
K3ZXL   www.k3zxl.com   "In the Beginning, there was Spark Gap"
===============================
NOBSKA
www.nobska.net
===============================
Cape Cod Instruments
www.oceanbiz.net
===============================
----- Original Message ----- 
From: <50mhz-request at mailman.qth.net>
To: <50mhz at mailman.qth.net>
Sent: Saturday, June 27, 2009 12:00 PM
Subject: 50mhz Digest, Vol 65, Issue 24


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> Today's Topics:
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>   1. Re: Comparison Table of 6m Antennas by VE7BQH
>      (Lance Collister, W7GJ)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 26 Jun 2009 16:07:06 +0000
> From: "Lance Collister, W7GJ" <w7gj at q.com>
> Subject: Re: [50mhz] Comparison Table of 6m Antennas by VE7BQH
> To: Magic Band EME Group <magic at 6meme.com>, Amateur radio moonbounce
> <Moon-net at list-serv.davidv.net>, PNWVHFS <PNWVHFS at googlegroups.com>,
> rmvhf at rmvhf.org, newsvhf at mailman.qth.net, Western States Weak Signal
> Society <wswss at mailman.qth.net>, 50mhzer's <50mhz at qth.net>
> Cc: "G0LCS, Kerry Rochester" <kerry.rochester at gmail.com>, Peter G8BCG
> <peter at g8bcg.org.uk>
> Message-ID: <BLU121-DAV5655E9762315846AE2B9489350 at phx.gbl>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> I now have the proper web page up in place with the link to the above 
> table, plus
> links to a number of the antennas included in the table:
>
> http://www.bigskyspaces.com/w7gj/6mTable.htm
>
> VY 73, Lance
>
>
> Lance Collister, W7GJ wrote:
>> Howdy!
>>
>> Over the last quarter century, antenna performance has improved 
>> dramatically.  Thanks
>> to the development of computer modeling software, antennas can now be 
>> designed to
>> provide excellent results.  Many older antennas are still in use around 
>> the world
>> that were built using less sophisticated techniques.  A number of 6m 
>> operators have
>> wondered if it is time to upgrade their antenna systems.
>>
>> There is no question that each operator has different interests and 
>> constraints.
>> Some want to arrange various antennas to "fill in the nulls" in ground 
>> gain patterns
>> so they can be assured of not missing signals coming in at certain 
>> angles.  Others
>> want to increase maximum signal strengths while still fitting the antenna 
>> in their
>> garden.  And still others are interested in assembling an antenna system 
>> that will
>> have enough free space gain to enable them to complete EME contacts while 
>> the antenna
>> is elevated (without any ground gain).  With the differences in how 
>> antennas are
>> marketed and what specifications are published, it is no wonder that many 
>> hams have
>> expressed confusion when they try to compare antennas to determine what 
>> would be the
>> best choice for their particular situations.
>>
>> Lionel Edwards, VE7BQH, is well known for his pioneering work in EME and 
>> his
>> knowledge of antenna design.  His comparison table of 2m antenna designs 
>> has been a
>> valuable resource for weak signal enthusiasts on that band.  Lionel now 
>> has
>> generously put together a table comparing a number of popular 6m antennas 
>> to help
>> guide Magic Band operators on antenna decisions.  This table was 
>> painstakingly
>> prepared to include the free space gain of each yagi with respect to a 
>> dipole, the
>> optimum and 75% of optimum stacking distances for both two and four yagis 
>> and
>> resulting gain figures, and the SWR of a single antenna 150 kHz from the 
>> design
>> frequency.  The SWR value provides an indicator of the "Q" of the 
>> antenna, and how
>> likely it is to be affected by rain, ice and snow; the narrower the 
>> bandwidth of the
>> antenna, the more susceptible it is to such detuning by the weather.
>>
>>   http://www.bigskyspaces.com/w7gj/6mAntennaComparisonTableByVE7BQH.txt
>>
>> Please join with me in thanking Lionel for graciously agreeing to 
>> undertake the very
>> laborious challenge of preparing such a table.  I will also post a link 
>> on my website
>> to the table for convenient future reference, along with links to more 
>> information on
>> many of the antennas listed in the table.
>>
>> GL and DX! VY 73, Lance W7GJ
>>
>>
>>
>
>
>
> -- 
> Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, 
> E51SIX)
> P.O. Box 73
> Frenchtown, MT  59834  USA
> QTH: DN27UB
> TEL: (406) 626-5728
> URL: http://www.bigskyspaces.com/w7gj
> 2m DXCC #11/6m DXCC #815
>
>
>
>
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> End of 50mhz Digest, Vol 65, Issue 24
> *************************************