I tried to get an answer from SteppIR to no avail so I thought I would reach out to the TT community. Searched TT archives and googled for answers. I've read K7NV's and W6NL's writeup as well about t
using 100 MPH EIA-222-C) . I believe the 4 El SteppIR (9.7 sq ft) is fine on the WT51 Tashjian specs are for a *new* tower. I don't know the vintage or history of the LM-470 I have. It came with the
Also remember that Tashjian LM-470 specification is for 17.5 sq ft at 1 foot above the tower, not 17.5 sq ft at the end of a 20 foot mast. Mike, K6BR --Original Message-- From: towertalk-bounces@cont
Thanks Steve. It's El Dorado country. From Champion, it's a 75 MPH windspeed county. Current specs for a Tashjian: 1. LM470 is 18 sq ft @ 72' for 85 MPH w/ 3 sec gust per TIA-222-G. 2. WT51 is 13 sq
Thanks Grant. I am not trying to do calcs for a permit. The towers are already up :-). Trying to do a "safe" matching of antenna to tower. You hit the nail on where the confusion lies. I am trying to
I think the steppIR specs relate to the antenna wind survival and sq ft does not change with wind speed. Wind load is proportional the the square of the velocity, so a new L470 rated 85mph/18 sq ft s
The problem is that the "total load" on the tower is the antenna load PLUS the load of the tower. The tower's cross sectional area doesn't change, so you can't just scale the antenna area by the squa