[TowerTalk] Cover antennas - the good news and the bad news

[Mark - N5OT]

Great idea.  Do the exercise as well as you can multiple times, throw 
out the outliers and average the rest.

Drones are changing the world.  Bagpipe players take note.

73 - Mark N5OT


On 10/31/2020 12:17 AM, David Gilbert wrote:
>
> I would think that testing antennas today should be easier than it was 
> when the K7LXC/N0AX report was done, and I don't see why an antenna 
> range is even needed anymore.  A wideband noise source mounted on a 
> drone with an appropriately polarized short antenna could fly around 
> the antenna while a receiver on the ground connected to the antenna 
> took measurements.  Drones are very stable these days even in stiff 
> winds, and while I don't think GPS positioning would necessarily be 
> accurate enough to define near field location, various ways of doing 
> so from the ground (optical triangulation, tethers, etc) should be 
> sufficient.  Far field measurements out several wavelengths could most 
> likely just rely on the GPS coordinates.
>
> All of that assumes reciprocity, of course, but even if that was in 
> question I'd bet that it would be relatively simple and inexpensive to 
> design/build a small receiver for the drone that forwarded signal 
> strength data to the ground via an RF or optical link.
>
> One big advantage of using the drone, of course, would be that the 
> measurements could also be taken at the actual operating site, thereby 
> including the effects of nearby structures.
>
> I haven't seen any reports of anyone doing this yet, but I assume that 
> people already have.
>
> 73,
> Dave   AB7E
>
>
>
>
> On 10/30/2020 8:35 PM, chetmoore at cox.net wrote:
>> Not a FLAME. But You would likely benefit from reading the k7lxc 
>> N0ax  tribander report. After raeading it I ordered the  C31XR.   
>> Force 12 is no more  but some of their antennas  are  mechanically 
>> improved and sold by JK and there are A lot newer tribanders  I would 
>> like to see them  test on their antenna range.  Hint,  tests of some 
>> of the mosely and hy gain antennas  did not fare all that well.  I 
>> had a TH6, a TH3 , TH7 and  a classic ta33 all of which worked
>> Pretty well..........in their day.   My th-3 is still a good FIELD 
>> DAY antenna  and great as a mult antenna to grab  south American 
>> mults  so I don’t have to  rotate the c31.
>>
>> N4fx
>
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