[TowerTalk] LPDA optimal height

[Richard Thorne]

I did some research on LPDA's not too long ago as I had a used M2 40 - 
10 Log in hand.  I ended up selling it to a local friend who is working 
on putting up his first tower.  The price was right and will get him 
started quite well.

Bottom line, the only real benefit of using a Log is if you are using an 
SDR rig like a Flex.  I can monitor 8 different frequencies at the same 
time on my 6700.

 From a pure gain, mechanical and cost standpoint (if your starting from 
scratch), one would be better off with one of the 5 band offerings such 
as the JK Navassa or F12 XR5 (if someone picks the business) with a dual 
band 30m/40m yagi like a Delta 240/230 or JK 3040 stacked above it.  If 
your not concerned about listening to more than one band at the same 
time, then a Steppir would be another option.

The gain of these antenna's are 'about' the same as a log (the steppir 
would more than likely produced more gain  depending on the model 
installed).

With a 5 band / 2 band  setup I could still monitor 7 bands at the same 
time.


Rich - N5ZC

On 2/14/2017 9:19 PM, Gary Johnson wrote:
> Another promising LPDA design is the Band-Optimized LPDA by G0KSC of InnovAntennas. There’s an interview with him in the Jan/Feb NCJ. The article is fairly enlightening. The upshot is that it’s not just a conventional ultrawideband design, and he ends up with decent gain and F/B for the bands of interest. They sell a version made in the UK and, for better or worse, a USA version made by… MFJ… using HyGain hardware.
>
> http://www.innovantennas.com/antennas-a-accesories/on-line-shop/view/productdetails/virtuemart_product_id/509/virtuemart_category_id/37.html
>
> Gary NA6O
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