Sounds like contamination in the plug on the rotor end. Water gets in, dries, and leaves slightly conductive residue between the pins- the residue causes the control box to display erratic results. I
I've got an LM-354HDSP which has the same base/base requirements as the LM-374. I talked with Karl about the hole requirement since a high water table at my QTH makes the spec'ed base difficult. (At
The best place to find bargains on NEMA boxes is eBay- there is a specific category for them; it is located in the following path: Business & Industrial Electrical & Test Equipment Electrical Equipme
Let me preface this with INAE (I'm Not An Engineer...); the below is based on my practical experience in both public safety and amateur communications. It is also based on the commonly seen protector
--snipped-- The "C0" (HF) Polyphasers are not that common on eBay but do appear from time to time. The "C1" (VHF/UHF) Polyphasers are almost always available, often in lots. The "C3" Polyphasers are
I've Googled for the answer, but came up empty How much does an average utility pole weigh per foor? Thanks, Doug K4AC _______________________________________________ ________________________________
Put a pair of switching diodes (IE: 1N914) back to back and across the pre-amp input to ground. High level RF will be shunted to ground while not effecting normal operation. ARR used to include the d
Well my GP-15 vertical on the top of the tower looks like it took a hit. It still works, but the SWR is varies all over the place (used to be pretty flat across 2 meters). This is the third damaged/d
Assuming that the tower is rigged the same way as others I've seen, it would be easier to disable the top section. The lifting cable from the winch is connected to the bottom of the second section. A
Reminds me of a commercial tower over near Melbourne, FL. The 400'+ tower was built on a former landfill. In the first few years, the tower sank several feet. The owner just kept tightening up the gu
In a previous life I had responsibility for a public safety tower in Clewiston, FL. The 350' tower had been built around 1980 on leased land. The land owner leased an adjacent plot to an AM broadcast
The LM-354HDSP has been built since at least the early 1990's. Throughout its life, it has had several redesigns/material changes that have resulted in it going from 16 square feet at 60 MPH with a m
Check the connector at the rotator- moisture can get in and cause the strange behavior you are reporting. I had something similar with my G-1000 a few years ago; when I took the connector apart, it w
We need to replace the Hamstick dipole on top of our EOC with something that will offer reasonable performance on 75/60/40. The EOC is in a five story building. Here are the limitations: 1) It's for
The unchangeable rule is nothing on the roof other than self-supporting vertical antennas mounted to the penthouse wall. Sometimes you just have to work with what you've got... If the big one ever hi
Thanks to all for the suggestions both on the list and direct. The key to the situation is that it must be a plain vertical antenna (no guys, etc.). It looks like about the only solution is going to
Two different types of fall arrest are getting munged together in this thread: 1) Typical fall arrest lanyard (usually has some type of rip out stitching to limit the "impact") that is clipped onto s
I've reposted W3AHL's excellent email on mast loading below. I used the Excel spreadsheet several years ago to check out my planned (at the time) installation. I've got an LM-354HDSP with 32' of mast
I once used 1/2 of a 32' aluminum extension ladder as a Gin pole for taking down a 60' windmill style tower- it worked exceptionally well. Figuring that an extension ladder is designed for a 250-350
I've seen some military versions of that design show up on eBay and the ham classified sites. Doug K4AC the http://plasma.newcastle.edu.au/plasma/research/tiger/venice/Inv_V_antenna_pa per.pdf ______