Jim Brown wrote:
> On Sun, 5 Apr 2009 16:00:50 EDT, RLVZ@aol.com wrote:
>
>> Yes- do have poor performance with verticals, but you mentioned that you
>> live in a heavily wooded area. Verticals work poorly in heavily wooded
>> areas so I don't believe that's a fair environment to compare verticals
>> to horizontals.
>
> I've looked for published scientific work on this and all I've found
> addresses VHF/UHF (either military, 2-way, or cellular applications). What
> I've seen generally agrees that absorption that increases with frequency,
> and that correlates with my experience. Can you point me to anything that
> addresses MF or HF in forests and heavy vegetation?
>
> 7
Your best bet is to look for reports produced in the 60s and 70s in
connection with the Vietnam War. George Hagn, among others, when he was
at SRI did a lot of tests. Most doesn't show up as pubs in IEEE
journals, but is in various DTIC stuff.
That said, I don't recall seeing much.
There's also some papers by Caviolotti(sp?) on propagation in layered
inhomogenous media (which is what a forest over ground is) in Trans on A&P.
I'll see if I can dig up some references next week.
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|