Stacking them would be fundamentally like stacking triband or 5-band
yagis - any stacking distance is a compromise, so you model them at
various spacings and go with the one that looks the best, given your
interests, the time in the sunspot cycle, etc.
73, Pete N4ZR
Visit the Contesting Compendium at http://wiki.contesting.com
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On 1/22/2010 3:08 PM, Doug Turnbull wrote:
> How does one stack two log periodic antennas which operate over such a wide
> range of frequencies? I thought the stacking distance was dependent on the
> frequency. Now if one is using them so that one can take advantage of
> signals arriving at different angles that is a different consideration.
>
> The SteppIR does have a very quick 2/3 second reverse pattern feature which
> is a dream to use in contests and the additional FB ratio is especially
> handy in these conditions. The SteppIR can also be used for dual direction
> work. How does the wind loading of a 4 element SteppIR compare to the LP
> which offers roughly the equivalent performance of a two element Yagi.
>
> I suppose there is no one answer for us all but SteppIR has certainly added
> a new consideration to our choice.
>
> 73 Doug EI2CN
>
>
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of rlvz@aol.com
> Sent: 22 January 2010 16:24
> To: towertalk@contesting.com
> Subject: [TowerTalk] LP v SteppIR
>
>
> If your a contester and your tower can handle the extra weight and
> windload... I like Buddy's idea. Having stacked antennas offers tremendous
> "take
> off angle" and "dual direction" advantages that far outweigh the extra 1-2
> dB gain of the SteppIR. Having the 2nd antenna at the better take off
> angle or pointed in the right direction could easily give a 10dB advantage.
>
> (unless you stack SteppIRs)
>
> One of my 3-element SteppIR motors kicked the bucket when only about 6
> months old... I didn't enjoy having to drop the antenna and wait for parts.
>
> That said, it was a great antenna when it worked.
>
> 73,
> Dick- K9OM
>
>
>
> In a message dated 1/22/2010 8:50:06 AM Eastern Standard Time,
> gdadx2@clearwire.net writes:
>
> Doug& others,
>
> I am going to put up a new antenna this spring, and my choices came down
> to
> either a LP, such as the T-10, or a 3-element SteppIR.
> I decided on the T-10 for several reasons. The main reason being I don't
> desire moving parts, little wires and motors at 75 feet. We get plenty of
> lightning during the summer here so it would only be a matter of time
> before
> something happened. Weather is the main reason I ruled out a quad also,
> too
> much freezing rain during the winter.
> Secondly, the SteppIR is too expensive; I could stack 2 T-8's for about
> the same price. Additionally, my operating style is one of jumping from
> band to band, and I don't want to have to tune my antenna every time I
> change bands, even if it takes a short amount of time. I think that would
> get old rather quickly.
> Like transceivers, all antennas have pros and cons, what works for me
> might
> not work for you. I just want an antenna I can put up and pretty much
> forget about.
>
> 73 Buddy WB4M
>
> --- Original Message -----
> From: "Doug Turnbull"<turnbull@net1.ie>
> To: "'Tower and HF antenna construction topics.'"
> <towertalk@contesting.com>
> Sent: Friday, January 22, 2010 4:39 AM
> Subject: [TowerTalk] LP v SteppIR
>
>
>
>> Gentlemen,
>> I wonder what the attraction of the LP is when one can use a SteppIR.
>> Am I wrong to believe that the Fwd gain and FB are better for a Yagi of
>> the
>> same number of elements tuned to the frequency of interest than an LP?
>> Is
>> it not the case that LP antennas have a lot of metal and hence wind
>> loading
>> for what they achieve? Wind loading is as important to me as gain and
>> directivity. It is a big balancing act. Granted the SteppIR has a
>>
> good
>
>> bit of electronics but in my experience they seem to be reliable.
>> Perhaps
>> the SteppIR is more expensive for the same performance but Aluminum is
>> pretty dear.
>>
>> I am not trying to start a 'barney' but these are just my thoughts
>>
> and
>
>> it may be that some one can correct me. I believe that SteppIR has
>> changed
>> the entire technology and past equations.
>>
>> 73 Doug EI2CN
>>
>> -----Original Message-----
>> From: towertalk-bounces@contesting.com
>> [mailto:towertalk-bounces@contesting.com] On Behalf Of
>>
> brahmangou@aol.com
>
>> Sent: 22 January 2010 02:24
>> To: towertalk@contesting.com
>> Subject: Re: [TowerTalk] Single Tower, All Band Solution ?
>>
>> You need to take a look at the Tennadyne T-8 log periodic. I have 8
>>
> towers
>
>> and have run most every antenna design at one time or another and it is
>> one
>> of my favorites. 5 bands, cw to ssb (try that with a trapped antenna),
>> instant band switching, no matching network, light and really low cost.
>> 73,
>> AB5GU
>> _______________________________________________
>>
>>
>>
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