[TowerTalk] More from the M2 antennas quality control file

[Patrick Greenlee]

Blind obedience to the instructions is no guarantee of success.  I once 
snapped off several 1/4 inch stainless steel bolts with a torque wrench 
set to the specs in the printed instructions.  A mech eng friend just 
laughed at me as it was obvious to him the instructions were wrong and 
twisting off the bolts was to be expected.  I exchanged the kit with no 
problems and was told I was probably the only customer who followed the 
instructions.

To quote my favorite cowboy philosopher, Will Rogers, "We are all 
ignorant, just about different things."

Patrick    NJ5G

On 4/13/2015 8:53 AM, Chuck Dietz wrote:
> I have a number of M2 antennas and I have only had one problem.  I called
> them and they corrected it immediately by shipping the correct part.  I
> have difficulty believing they won't correct a mistake they made.  I did
> call them about mistakes in parts supplied with one of my 9 element 6 meter
> beams, but it turned out I was misreading the directions and all the parts
> were correct.
>
> Chuck W5PR
>
> On Mon, Apr 13, 2015 at 8:26 AM, Jim Lux <jimlux at earthlink.net> wrote:
>
>> On 4/13/15 5:37 AM, Patrick Greenlee wrote:
>>
>>> I'm not a Yagi guru or an EZNEC modeler. Can someone tell me what 1/16
>>> of an inch in element length means in performance parameters in the
>>> example below?  I have done mostly wire antennas and 1/16 or 1/8 didn't
>>> seem to make much difference.
>>>
>>>
>> this is a 432 MHz antenna with a lot of elements where the elements are
>> about a foot long overall.
>> 1/16" if it's on both sides, is shortening the element by about 1%
>>
>> The element lengths are critical to getting low side/back lobe
>> performance, although it doesn't change forward gain very much.
>>
>>
>> As you note, on something like a dipole, a change of a few percent doesn't
>> change the performance all that much.
>>
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