I put up my A743 40m add-on kit in October 2005. I was disappointed to come home and find that the DE support rope has broken, apparently right in the middle -- where the rope passes through the phen
Finally completed enough tower climbs to get a diagnosis on this. The line was frayed in two at the center. Part of the problem was that I didn't quite install it correctly. The instructions call for
This is not what the manufacturer recommends. See here: http://www.radiancorp.com/ROHNNET/rohnnet2001/catalog/pdfs/25G/25G-1.pdf Look at note #2 -- Fixed bases must be used, "Pinned" bases cannot be
I carry a small circular slide rule in my car. It's probably 25-30 years old, a promotional item sent out by some hydraulics company. I regularly find it useful. Just today I was calculating the leng
For antennas, I've taken to thinking of antenna height solely in meters. For any horizontal antenna, the key dimension is the height above ground in wavelengths -- and it's hard to judge wavelengths
Several comments: 6" of gravel is more like it. Is this for a free-standing, bracketed or guyed tower? The 2x2x4 dimensions are correct for a bracketed or guyed tower. For freestanding, the base dime
There's a big difference between "not guyed" and free-standing. Bracketing is another method of giving a tower vertical support. You are probably lucky that they are still standing, as 40 feet bracke
You know, if bolt-loosening is a serious problem, then why not use the same technology used to hold aircraft bolts in place? Use drilled bolts, and safety-wire them? With the four bolts on an antenna
For the record, though, the use of Loctite to secure a fastener is not considered sufficient for aviation use. There are only three approved methods: 1) Castellated nuts and cotter pins 2) Nyloc nuts
I've cut plenty of .058 wall Al tubing that was telescoped inside or outside other tubing. Make sure the cutter is sharp. Any burr that you have can be easily removed with a deburring tool, or with s
In all my years of reading Towertalk, this is the first time I've seen mention of replacing guy wires at regular intervals. How often do guy wires need to be replaced? Where in the Rohn catalog does
I'll answer the question with a story. A local ham named Paul borrowed climbing gear and an antenna analyzer (when they were pretty new) from another local ham named Dan. Paul was very excited to cli
Fastest way to cut aluminum tubing, if you have a machine shop, is to use a band saw. With a proper blade, you can roll the tubing across the table and it cuts quickly. The second best way is to use
This is, indeed, a Ham-M control box. It can be used with the Ham series of rotators, since they are all pretty much identical electrically. CATS has a history page about the CDE series of rotators -
Gregg, I didn't see an answer to your question from this old message. Here are some ideas: It could be the guys are affecting the antenna. Rotate the antenna about 90 degrees and see if the SWR chang
I've written to Jack about his problems, which may be the result of trying to mix the older A3 with the A743. I'm sorry to hear that he hasn't gotten it working. I've been running an A3S/A743 for abo
Yeah, details, details... I think the Ham-M Series 1 and 2 aren't directly compatible with series 3, 4 and 5. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years wil
However, in a fall arrest situation, it is unlikely that all of the arrest force occurs in the shear direction. 25G has considerably more vertical support strength. On a 200 foot 25G tower, the stati
I have an R7000 mounted only 8 feet high. A couple of years ago, I added eight 12 foot radials from the base of the support mast across the ground. I found that this improved the reception of the ant
Elements too long, or, antenna too close to the ground (or other large conductive objects), or, faulty mis-tuned traps. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Web: http://boringhamradiopar