[TowerTalk] Flexible jumper on top of the tower ?

[z.pitman@libertel.nl]

Hi guys,

Can you advise me about the best jumper cable type for a rotated Yagi ? 

The setup is the following:

25m high steel self-supporting tower, one antenna on the top and one at 12m.
Spinner antenna relay will be mounted at 18.5m. The cable from the shack to
the relay box is LDF-50 (7/8"). The distance between the relay box and the
feedpoint is 14.5m (6.5m vertical, 5m horizontal and 3m bending arc). This
jumper cable should be very flexible, tolerate -30 / +50 degs C, should be
rated to 8 kW (the antenna system is used as backup by a government agency)
and low loss. My best guess is RG-225/U or RG-393/U (made by Suhner) so far.


They have the same properties (power rating, loss) but the 225 has 1mm
thicker silicon varnished glass fiber braid jacket and the 393 has FEP
(fluor-ethylene-propylene) jacket. Which of these two material has better
mechanical properties and UV-resistance ?

Or maybe you know a better type ? 

73 de Zoli HA1AG

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