[TowerTalk] TowerTalk] portable verticals with crummy ground

Jim Lux jimlux at earthlink.net
Tue Jul 5 10:08:13 EDT 2005


At 06:09 AM 7/5/2005, Roger Parsons wrote:
>My experience (admittedly really limited to 160m) is
>that it is pretty easy to get ~50% efficiency. It is
>pretty hard to get close to 100%.
>
>My justification for saying this is that at one point
>I had an inverted L (in a tree) with about a 50'
>vertical section fed against a few poor radials. I
>also had a 95' top loaded vertical fed against >150
>long radials about 400' feet from the inverted L. The
>difference between the two was certainly well less
>than 6dB. I also had a 300' vertical at my remote site
>(about 7 miles away) fed against 120 x 1000' radials.
>No great difference between that and the 95' vertical,
>although the DX characteristics were a bit different.
>
>Quite depressing really!


Or, perhaps, an incentive to do a "system design", especially for portable 
ops.  You might be better off with a big amp and a crummy antenna than 
barefoot and a good antenna that takes hours to set up.

For a permanent installation, you could have both the good antenna AND the 
big amp.


>73 Roger
>VE3ZI
>
>
>
>
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