[TowerTalk] Wireless ISP on Ham tower

[Chuck Sudds]

At 11:14 AM 5/30/2006 -0700, Robert Hess wrote:

I have a 2.4Ghz dish on my tower at the 30ft level.  It's one of the 
BBQ-like grill dishes, as my ISP tower is about 20 miles away and I need 
all the gain I can get.  I have unshielded CAP-5 wire running from the 
tower to the house, approximately 125ft away, to my router

I have never experienced any interference from the ISP setup to any ham 
frequencies that I operate (HF, 6M & 2M) BUT I occasionally interfere with 
the ISP dish.

I have a 5el 20M monobander at the 96ft level of the same tower, complete 
with balun, and even running 2kw, I never interfere with the ISP but if I 
go over to 160, 80 or 40 meters and use my inverted-vee suspended at the 
86ft level from the same tower with NO balun, I shut down the ISP receiver 
and I need to power it down and right back up to continue getting a 
signal.  Same with 6M antenna at 105ft level.....I interfere with the ISP 
when I kick on the 1200 watt amp but I don't shut it down just running 100 
watts (normally.)  No balun on this beam either.

The coax cables all run right by the ISP receiver/dish, so I am thinking 
that I have RF on the shields of the coax without the baluns.  Everything 
is grounded so the next thing I plan to try is adding a balun on the 
dipole, as that is the most accessible. And/or some ferrites someplace 
or????   (Ideas???)

Chuck  KØTVD - Mo Valley, IA



>Anyone out there have a wireless ISP operating from
>your tower?  If so, any interference to your equipment
>from the ISP or from the ISP to your equipment?  900
>MHz, 2.4 or 5.8GHz?  Do you run legal limit?  HF or
>VHF operating on the tower with the ISP?
>Bob
>W1RH