[TowerTalk] [SteppIR] 80 mtr dipole spacing above Steppir

[Joe Subich, W4TV]

> Those considering stacking might check out Tennadyne's Antenna Fact's
> #5 Multiple Antennas on the Same Mast. A good techincal basis that
> winds up about where you would guess you should want to be.

Unfortunately, the Tennadyne Antenna Fact #5 has a significant error.
It calculates the Gain factor "G" using dBd and not dBi.  Using dBd
understates the gain factor by 2.1 dB (or about 60%).  That makes a
difference of about 16% in the final "radius" which could be fairly
significant with high gain antennas.

73,

    ... Joe, W4TV


On 2/8/2011 2:07 PM, Gene Fuller wrote:
>
> Those considering stacking  might check out Tennadyne's Antenna Fact's #5
> Multiple Antennas on the Same Mast. A good techincal basis that winds up
> about where you would guess you should want to be.
> Gene / W2LU
>
> ----- Original Message -----
> From: "Mike"<noddy1211 at sbcglobal.net>
> To:<towertalk at contesting.com>
> Sent: Tuesday, February 08, 2011 11:27 AM
> Subject: Re: [TowerTalk] [SteppIR] 80 mtr dipole spacing above Steppir
>
>
>> And I worry about having a 3 element Steppir and 7 element 6 meter beam 10
>> feet over the top of a 70 foot crank up.  Which at that height I figure is
>> equal to the 17 square feet that the LM-470 is supposed to handle: -)
>>
>> Mike
>>
>> -----Original Message-----
>> From: towertalk-bounces at contesting.com
>> [mailto:towertalk-bounces at contesting.com] On Behalf Of Al Williams
>>
>>
>> That is a lot of antennas on a crankup--what model. how long has it been
>> up,
>>
>> and what windy condx?
>>
>> I have lm470 with only a monstir with no long mast.
>>
>> k7puc
>>
>>
>>
>> ----- Original Message -----
>> From: "Daniel Domondon"<domondon at inter.net>
>> Sent: Tuesday, February 08, 2011 2:43 AM
>>> I have a 72 ft self supporting crank up tower with 20 foot of mast
>>> protruding from the top of the tower. A Cushcraft 2 el 40m beam (shorty
>>> forty)
>>> is just above the base of the tower  at 73 feet. A Create 80 meter dipole
>>> is mounted 9.5 feet above
>>> it (at 82 feet)  On the very top of the mast is a SteppIR 4el (20m-6m -
>>> 32
>>
>>> foor boom) at 92 feet.
>>> This means that the 80m dipole is mounted about in the middle of the two
>>> beams.
>>
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