In my experience, math is always more logical than instinctual human hunches
based on word-of-mouth.
Craig AC0DS
> On 10, Sep2019, at 4:01 PM, David Gilbert <xdavid@cis-broadband.com> wrote:
>
>
> You and N5OT aren't saying the same thing at all. He said to just experiment
> and see what works well enough to be acceptable, while you said you ignored
> the practical experience of other hams (stuff that "works" or doesn't) and
> instead used a modeling program (which is based purely on math and theory) to
> make your decision.
>
> It's odd to see two guys pat each other on the back for reinforcement when
> they don't even understand they have opposite stances. Whatever happened to
> logical thinking?
>
> Dave AB7E
>
>
> On 9/10/2019 1:44 PM, Bob Shohet, KQ2M wrote:
>> Mark has nailed it!
>>
>> One of the nice things about making something and seeing it it works well
>> enough is that what you make doesn’t know how well it is supposed to work
>> and doesn’t care. :-)
>> So if it works it works regardless of what anyone thought beforehand.
>>
>> Usually if it works (and no one thought it would), we find out long after
>> the fact why it worked, and generally it was something that wasn’t known or
>> understood at the time, and now the field advances with the “Gee, I wonder
>> why it works so well?” study and discoveries afterwards.
>>
>> Simple example... I wanted to put up a 4-stack on 15 meters when I built my
>> station. I new that I needed heights of 30’, 60’ and 90’, but with 100’ of
>> tower it didn’t seem to make sense to put another 15 above that. The
>> thinking was that even on a tall mast, the 90’ and another 15 at 109’ would
>> be too close and would phase poorly especially if they were pointed in
>> different directions. Everyone that I asked about this said so. These guys
>> built great stations and are great ops. You know all of their calls. But I
>> modeled the stack with K6STI’s YO and it looked GOOD! I asked them again.
>> “NO! I would not do it” came the answer in unison. Thankfully I did my
>> homework beforehand and I chose not to listen to the advice of people that I
>> respect.
>>
>> So I built it and put it up anyway. The 5L at 109’ was and is a KILLER!,
>> especially when in phase with the 90’. I believed the modeling over my
>> terrain. The software was correct and my 15 meter experience has been
>> awesome for the past 20 years. (And I have thanked Brian, K6STI many times
>> over the years)
>>
>> Before I put it up I reasoned that if it didn’t work I could always take it
>> down. But if it did work, I would never want to! :-) Very high reward to
>> risk ratio!
>>
>> Moral of the story: Model it, build it well, put it up and see how it does!
>>
>> 73
>>
>> Bob KQ2M
>>
>>
>> From: Mark - N5OT
>> Sent: Tuesday, September 10, 2019 4:11 PM
>> To: towertalk@contesting.com
>> Subject: Re: [TowerTalk] "experts" on loading towers on low bands
>>
>> I'm a big fan of "experiment trumps theory" and basically I have spent
>> nearly 50 years doing the following:
>>
>> 1. Make something.
>> 2. See if it works well enough.
>> 3. If it works well enough, you're done. If it doesn't, change
>> something and see what happens.
>>
>> Clearly I'm just an amateur. But because I'm on TowerTalk™ I can say I
>> make "educated guesses."
>>
>> Love you guys,
>> 73 - Mark N5OT
>> (intended to be humorous - everyone carries a bucket of gasoline in one
>> hand and a bucket of water in the other - they get to choose which one
>> they throw on the fire - I choose water) (most of the time)
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|