Gents: Yesterday I subscribed to the ARRL-802.11B (similar to commercial Wi-Fi wireless Internet access but in the Amateur 2.4 GHz band) reflector. I've received several postings since then. However,
Richard: FWIW, I bought and installed a Cushcraft D40 rotatable dipole near the top of the mast on my tower. The dipole is at about 78 feet AGL. I built it for the low end of the band and it met the
Ken: My D40 sags, I guess, a couple of feet. If you look at the pdf I mentioned in my previous e-mail (http://www.cushcraft.com/support/pdf/d4.pdf ), which is the manual for the D4 (40/20/15/10, not
Jerry: I'm down the hill from a Big Gun (Top of Honor Roll ever since I've known him - 20+ years.) When he's on the same band as I, my receiver knows it. He usually runs close to 50 dB over S9. He sa
Tom et al: Be careful! The pub I used to sort of help me through my tower design learning process is the Uniform Building Code from 1997. In that volume, under design of footers, the size of the exca
Tom: Specific design info from the manufacturer, in my mind, would trump anything from a general code manual like the UBC that I referred to. My point in my e-mail, though, was that a circular hole t
David: Joel at The RF Connection: www.therfc.com . 73 de Gene Smar AD3F --Original Message-- From: David Robbins K1TTT <k1ttt@arrl.net> To: reflector -tower <towertalk@contesting.com>; reflector cq-c
TT: The tower tip I find most valuable is to remind myself before each climb: There are no such things as ACCIDENTS on towers. Usually an injury or damage is caused by careless action by one or more
TT: An alternative to your shack's PC clock (which is probably not visible out by the tower's shadow) is a typical cellphone. All digital cellular/PCS networks rely on GPS signals to maintain synchro
Jose': My 80M half-sloper also exhibits a very wide 2:1 SWR bandwidth. If I recall, it's below 2:1 from 3.5 - 3.8 MHz. It's resonant (min SWR) around 3.6 MHz. The sloper wire is about 67 feet long, a
Andy et al: Let me chime in at this point. I chose the rented post-hole digger route two years ago to dig a 6X6X6 or so hole for my Trylon. I gave up after one evening of drilling and only a few DAYS
Tim: It seems to me (I haven't done the math) that you'd be better off taking the time and trouble to dig the deeper hole and pour concrete in a cubish form, rather than use long, cross-type footers
Rich et al: Trylon's commercial web page lists such side-mounts: http://www.trylon.com/lightdutytowers/selfsupporttwrs_accessories.asp#side . 73 de Gene Smar AD3F
TT: Steve's correct (as usual.) The Trylon side mount shown will not allow rotation of a center-mount HF Yagi. Let me offer an alternative: http://www.trylon.com/pdfs/Working%20platform.pdf . This is
TT: I was going through some old mags in the basement today and found a couple of articles of interest (I hope) to TowerTalk related to Yagis. They are both from the June 1991 issue of IEEE's Antenna
TT: But remember: These antennas are sized in terms of ACRES of area, not square feet! Check out: http://www.antenna.be/hr.html . 73 de Gene Smar AD3F These arrays can also slew the beam as much as +
Joe: Thanks for the note. You're right regarding K6STI's influence on this project. The original article has a footnote that states: quote The authors thank B. Beezley for the full NEC final analytic
Jon: I bought a SKyhawk in 1999 and installed it in late 2001 (natural procrastinator, I guess.) Check out my posting http://lists.contesting.com/_towertalk/2001-December/043334.html on my first impr
Chuck: I bought my copper ground rods from RF Connections. They also carry galvanized 5/8 inch rods. Check out www.therfc.com . It might be expensive to ship, though. Try a local Home Despot or simil