Something is VERY wrong with those gain figures Dick. Are you adding ground
gain?
And if the F/B is real Im not at all impressed with either. I could
demonstrate at least 20dB F/B and 30-35 dB over 200 kHz with my 20M 4el PV.
Those tests were run many times when N6BV lived a few miles away in Windham.
We also ran similar tests on my 15 & 10M versions. Id much prefer deep F/B
nulls in DX pileups and not worry about perfect VSWR or losing a few tenths
of a dB in gain.
Carl
KM1H
----- Original Message -----
From: "Dick Green" <wc1m@msn.com>
To: "'Bob Maser'" <bmaser@tampabay.rr.com>; "'Joe Subich, W4TV'"
<w4tv@subich.com>; "'Carl Smidt'" <xveoneov@primus.ca>;
<towertalk@contesting.com>; <SteppIR@yahoogroups.com>
Sent: Friday, June 29, 2007 1:34 PM
Subject: Re: [TowerTalk] SteppIR
>I don't want to get in the middle of this, but I just ran EZNEC models
> comparing the 4-el SteppIR and Force-12 EF-420 on 20m at 96'. The SteppIR
> boom is 32'; the EF-420 boom is 30' (and presumably optimized.) Results:
>
> 4-el SteppIR Force-12 EF420
>
> Elevation at max gain: 10 degrees 10 degrees
> Forward gain: 14.36 dBi 14.29 dBi
> Front/Back: 18.12 dBi 17.35 dBi
> Front/Side: 18.12 dBi 17.35 dBi
> Beamwidth: 60 degrees 60 degrees
>
> It would be hard to tell the difference between these two antennas. I have
> both installed, but the EF-420 is only at 72' on a tower that doesn't have
> as good terrain as the tower on which the SteppIR is mounted. The SteppIR
> consistently outperforms the EF-420, usually by as much as 5 dB. I
> attribute
> that entirely to the difference in height and terrain.
>
> I have not done models for 15m and 10m because I don't have data for any
> 4-el antennas for those bands. But I have compared the 4-el SteppIR with a
> Force-12 515 (5-el on 15m, 24' boom) and a Force-12 616 (6-el on 10m, 24'
> boom.) The gain figures are nearly identical, but the F/B on the SteppIRs
> is
> lower, especially on 10m (a well-known characteristic of the SteppIR
> design,
> resulting from inability to place the elements optimally on all three
> bands.) The gain being comparable suggests that optimized 4-el monobanders
> for 15m and 10m would outperform the SteppIR. But I don't know by how
> much.
>
> 73, Dick WC1M
>
>> -----Original Message-----
>> From: Bob Maser [mailto:bmaser@tampabay.rr.com]
>> Sent: Friday, June 29, 2007 12:00 PM
>> To: Joe Subich, W4TV; 'Carl Smidt'; towertalk@contesting.com;
>> SteppIR@yahoogroups.com
>> Subject: Re: [TowerTalk] SteppIR
>>
>> Joe, have you been smoking weed again? It's affecting your brain.
>> Your
>> logic makes no sense at all. A 4 element on a 34 foot boom at the same
>> height and optimized with YO or some other optimization program will
>> outperform the SteppIR if both antennas are reasonably close by. You
>> sound
>> like someone trying to justify spending all that money. Better you
>> should
>> light some candles and pray that the element drive motors stand up.
>>
>> Bob W6TR
>> ----- Original Message -----
>> From: "Joe Subich, W4TV" <w4tv@subich.com>
>> To: "'Bob Maser'" <bmaser@tampabay.rr.com>; "'Carl Smidt'"
>> <xveoneov@primus.ca>; <towertalk@contesting.com>;
>> <SteppIR@yahoogroups.com>
>> Sent: Friday, June 29, 2007 10:30 AM
>> Subject: RE: [TowerTalk] SteppIR
>>
>>
>> >
>> > Bob,
>> >
>> >> For any specific band most monoband antennas will stomp a SteppIR,
>> >> assuming that the boom length is the same or longer than the
>> SteppIR.
>> >
>> > That's complete nonsense unless you are comparing something like a
>> > 60 foot boom monobander. YO shows a 1 dB advantage for the 4 element
>> > over the 205CA because the 205CA gives up gain to maintain usable SWR
>> > across the entire band. The N6BV optimized design (BV205) is about
>> .5 dB
>> > below the SteppIR.
>> >
>> > It takes a much larger monobander (6 el 60 foot on 20, 6 el 48 foot
>> > on 15 and 7 el 48 foot on 10) to achieve at least 1 dB more gain than
>> > the SteppIR. Sure, one could put up a set of WA3FET (K3LR) OWA
>> antennas
>> > for each band but not on one tower.
>> >
>> > 73,
>> >
>> > ... Joe, W4TV
>> >
>> >
>> >
>> >
>> >
>> >> -----Original Message-----
>> >> From: towertalk-bounces@contesting.com
>> >> [mailto:towertalk-bounces@contesting.com] On Behalf Of Bob Maser
>> >> Sent: Friday, June 29, 2007 8:50 AM
>> >> To: Carl Smidt; Richard J. Fiero II W5TFW;
>> >> towertalk@contesting.com; SteppIR@yahoogroups.com
>> >> Subject: Re: [TowerTalk] SteppIR
>> >>
>> >>
>> >> Carl, your bragging doesn't make any sense at all. For any
>> >> specific band
>> >> most monoband antennas will stomp a SteppIR, assuming that
>> >> the boom length
>> >> is the same or longer than the SteppIR. For band hopping
>> >> convenience, I
>> >> would agree with you that the SteppIR antenna is better than most
>> >> tribanders. All of this bickering back and forth has become
>> >> tedious at
>> >> best.
>> >>
>> >> Bob W6TR
>>
>
>
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