[600MRG] A dilemma....

[Brian, WA1ZMS]

Ken-
I gave a look at the QEX index as well as searched QST. No luck. I even looked in a few coppies of RSGB's RadCom. I could find nothing.

I know I didn't dream it. It was a well written article on the process to understand where to place traps in a dipole. Even a Google search showed nothing like I read.

It could have been in a non-ham publication or something I was reading on my iPad. But I read it in the last 6 months or so. Dang it!

Sorry OM. Maybe a kind soul will know where it was published.

-Brian, WA1ZMS
iPhone

> On Aug 31, 2015, at 6:36 PM, "Kenneth G. Gordon" <kgordon2006 at frontier.com> wrote:
> 
>> On 31 Aug 2015 at 18:00, Brian, WA1ZMS wrote:
>> 
>> If memory serves....there was an article in QEX many years back that addressed
>> this topic.
> 
> I THOUGHT that was the case, but have read so many articles over so long 
> that I wasn't sure I was remembering correctly. Anyone know the title?
> 
>> The take away is: that along the length of a trap dipole you need
>> to factor in the effect of the impedance changing. It has to. Voltages and
>> currents are different at each location. Thus it becomes a more complex problem
>> than just a simple LC tank that is resonant at freq(a). The trap will take the
>> place of several degrees of phase shift "away" from the lower freqs that you
>> want to keep traveling down the rest of the wire. The solution requires almost
>> simultaneous equations to be solved if you get more than say 3 bands involved.
>> 
>> I know I'm not giving this the best explanation it deserves. And guys like N6LF
>> can "leave me in the dust" when it comes to antennas so take what I say with
>> caution.
>> 
>> If I or anybody else finds the article please post it. It's one I should have
>> scanned into pdf at the time I read it.
> 
> Me too!!!! :-)
> 
> Ken W7EKB
> 
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