Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Mon, 4 Sep 2006 15:27:15 -0400
I found one of the adjustable ladders is quite handy when tuning antennas near the ground. As far as I can see this is just a different take on something that's been around a while. Go to your local
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Tue, 5 Sep 2006 00:52:47 -0400
A 12 to 14 inch galvanized lag bolt/screw eye will have a 3.8" to 1/2" shank. It shouldn't do much bending. Roger Halstead (K8RI and ARRL 40 year Life Member) N833R - World's oldest Debonair CD-2 www
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Wed, 6 Sep 2006 02:33:38 -0400
Also don't use a staple gun! I had some eager friends at a local non-profit who took it on themselves to install CAT-5 Ethernet in the building using this method. A world of trouble at 100 Mbit/s...
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Fri, 8 Sep 2006 02:03:03 -0400
Look at 3/4" copper pipe at between $2.00 and $3.00 USD a foot and last time I checked a 250 foot box of 10-2 or 12-2 (forget which) was about $130. OTOH almost every inch of pipe in the house is pla
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Sat, 9 Sep 2006 04:32:02 -0400
As far as normal ground resistance I'd really not expect to see much difference. OTOH I'd be concerned about diode action and noise from the barbs in some conditions. The barbs are just a short piece
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Sat, 9 Sep 2006 15:34:20 -0400
Other than a nit...resistivity would be ohms per cubic CM, or cubic meter. In electronics we used cm^3 but I'd guess in the electricall transmission area it'd be m^3 Roger Halstead (K8RI and ARRL 40
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Sun, 10 Sep 2006 01:55:41 -0400
I'm assuming you mean a pit or trench latrine as the definition also includes public toilets,commodes, ...etc (a whole long list) At any rate using one for a ground brings some interesting thoughts t
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Sun, 10 Sep 2006 02:00:40 -0400
Just give it a couple of coats of clear Krylon, sand smooth, couple more coats, and then a final coat of white epoxy paint. Actually the clear krylon will do quite nicely as will white or black. Chec
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Sun, 10 Sep 2006 22:51:08 -0400
Check your local yellow pages as well as the internet for industrial fasteners. Here in Midland we have Prime Fastener which is a part of Alma Bolt. I know they have a web site, but not if they have
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Mon, 11 Sep 2006 18:03:45 -0400
I use two boards and an old automotive scissors jack. I said, old. I think the new cars now come with them as they have no bumpers to hold a jack. Roger Halstead (K8RI and ARRL 40 year Life Member) N
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Wed, 13 Sep 2006 00:27:12 -0400
Unfortunately they didn't. I shot a complete circle from the top of mine (also a 100') and then stitched them into a panorama. It looked pretty good, but unfortunately was nearly 70 Megs. Roger Hals
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Fri, 15 Sep 2006 20:18:38 -0400
I had one of the GS-065 bearings. They do look nice, but I thought is was pretty light duty compared to the TB-3 and 4. OTOH my system presents a *lot* of leverage to the top thrust bearing. Roger H
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Sat, 16 Sep 2006 11:46:34 -0400
Remember this mast has to do basically what the top mast does. It is one long torsion bar. That and with a thrust bearing at the top the tower will end up supporting all the extra weight of the mast
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Sat, 16 Sep 2006 16:17:08 -0400
At our last swap there was a guy selling Aluminum tubing, boom to mast clamps, and mast coupling/clamps. The couplings were sizeable and appeared to be very rugged. At something in the order of the
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Sun, 17 Sep 2006 00:45:22 -0400
Yah, but right or left? I hate to align the 30 degree wide main lobe on my antenna 3/4 of a degree in the wrong driection. That'd make it 1.5 degrees off optimum<:-)) Roger Halstead (K8RI and ARRL 4
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Sun, 17 Sep 2006 16:38:01 -0400
<snip> The spotting scope on my larger telescope 2500mm @ f10 (don't remember the spotting scope magnification, but the objective is 50mm for light gathering) has not only cross hairs, but a graduat
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Sun, 17 Sep 2006 17:52:09 -0400
This isn't a great deal different, if any, than a thrust bearing on top with the rotator on the bottom as the rotator serves as a weight supporting thrust bearing. I would think for bottom mounted r
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Mon, 18 Sep 2006 05:24:51 -0400
Many commercial bearings just don't work that way. The ROHN TB-3 and 4 as well as the Yaesu would be difficult to install in the normal manner without them supporting weight. Both have an upper and
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Mon, 18 Sep 2006 05:34:40 -0400
Hit up the junk yards. They have all kinds and sizes of splined shafts *cheap* compared to PTOs. and they will be close to the same size. Balers and a lot of other equipment use this arrangement so