Re: [IRCA] (Big Loop antennas)

[Walter Salmaniw <canswl@xxxxxxxxx>]

Thanks for that, Andy.  I was unaware of this requirement.  Next time I'm
in Masset I will alter the loops.  73,  Walt

On Sunday, April 19, 2015, Andrew Ikin <andrew.ikin@xxxxxxxxxxxxx> wrote:

> Walter,
>
> You will be lucky to achieve more than 3dB gain with a two turn loop and
> an ALA100. The reason being is that the twin loop impedance increases too
> much and this causes a  miss-match  to the ALA100. However, this miss-match
> can be reduced by having a larger winding separation approx. 30cm.
>
> 73
>
> Andrew
>
> -----Original Message----- From: Walter Salmaniw
> Sent: Sunday, April 19, 2015 11:05 PM
> To: Mailing list for the International Radio Club of America
> Subject: Re: [IRCA] (Big Loop antennas)
>
> Andy, is the same true for the ALA 100 loops? (ie the 2 turn loop).    In
> Masset, my main ALA is quite a large circumference, about 20' base x 35'
> height, and I have 2 loops.  Is there a need for separation of the 2
> loops?  Mine are about 10 cm apart.   73,   Walt
>
> On Sun, Apr 19, 2015 at 8:45 PM, Andrew Ikin <andrew.ikin@xxxxxxxxxxxxx>
> wrote:
>
>  Hello Chuck,
>>
>> W8JI's words as to the operation of terminated loops is disputed by K9AY.
>> Gary Breed K9AY is quite correct when he states the antenna relies on the
>> both interaction of the E and H Fields. The H field response of any loop
>> is
>> proportional to the antenna area.
>>
>> The termination resistance performs two functions; to balance the
>> resultant EMFs induced in the antenna and reduce the phase difference of
>> these EMFs. Hence, the antenna gain is dependant on the loop area.  BS
>> Collins, who designed a Terminated loop array in the 70s and R Keen in the
>> 1927 ed. of Wireless Direction Finding when describing a French design of
>> the Terminated loop similar to the K9AY, both describe the antenna
>> operation in a similar manner as Gary Breed.
>>
>> As a matter of interest one can double the loop area of the K9AY by using
>> a two turn loop to increase the gain by approx. 5dB.
>>
>> 73
>>
>> Andrew Ikin
>>
>> -----Original Message----- From: Chuck Hutton
>> Sent: Sunday, April 19, 2015 8:26 PM
>>
>> To: irca@xxxxxxxxxxxxxxxx
>> Subject: Re: [IRCA] Station #500! (Big Loop antennas)
>>
>> For those interested, http://w8ji.com/k9ay_flag_pennant_ewe.htm has a
>> paragraph describing the fact that the pickup for K9AY  and other
>> "terminated loops" depends solely on the "vertical" aspect of the slanted
>> wires and no pickup is contributed by the horizontal section on the
>> bottom.
>> Area of the antenna (as referenced in the article below) is therefore
>> meaningless.
>> Chuck
>>
>> From: charlesh3@xxxxxxx
>> To: irca@xxxxxxxxxxxxxxxx
>> Subject: RE: [IRCA] Station #500! (Big Loop antennas)
>> Date: Sat, 18 Apr 2015 20:11:26 +0000
>>
>>
>>
>>
>> Guy -
>> The John Bryant article is only about KAZ antennas and doesn't touch the
>> DKAZ version.I have some issues with the article - using a "surface area"
>> concept to compare antennas whose gain is largely dependent only on the
>> height of the vertical sections is not right.
>> Chuck
>>
>>  From: dx@xxxxxxxxxxxxx
>>
>>> Date: Sat, 18 Apr 2015 13:03:33 -0700
>>> To: irca@xxxxxxxxxxxxxxxx
>>> Subject: Re: [IRCA] Station #500! (Big Loop antennas)
>>>
>>> Hi Nick,
>>>
>>> John's article on large DKAZ antennas is the one that came to mind for me
>>> in this discussion of Super Loops. Although I believe a Super Loop is
>>> rectangular, the big DKAZ may be of interest to Brian:
>>>
>>> http://www.dxing.info/equipment/kaz_bryant.dx
>>>
>>> John compared 112 Ft. X 28 Ft.and 40 Ft. X 10 Ft. DKAZ antennas for this
>>> article.
>>>
>>> 73,
>>>
>>> Guy Atkins
>>> Puyallup, WA
>>>
>>>
>>>
>>>
>>>
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