Jim, Big Grip installation instructions are at: http://www.preformed.com/artsfest/files/AppProc/SP2049-3.pdf Use heavy duty thimbles, 3/8 inch is okay. Typically the big grip is installed so that the
Trent, Elegant simplicity is the reason insulated base verticals are the "defacto standard" for 4-square arrays. Each element is identical and most importantly there are no reactive elements between
Roger, Congratulations on your planned new tower! Use the guy wire specified in the Rohn drawings and tension it to 10% of breaking strength. If tension is less than approximately 8 percent, the guy
Hi Bruce, It sounds like you have a good plan. The only serious problem I see is that 160 will be weak for DXing, an inverted-V at 100 ft is just a cloud warmer so you'll have a great signal on the e
Effective January 1, 1006; tower grounding standards in the United States are specified in ANSI/TIA-222-G-2005. Section 10.4 states: Connections between a structure and grounding electroes or connect
Kirk, Any trained tower climber will be very concerned about the lack of safe tower climbing practices evident in your photographs. Here's an excellent reference for safe tower climbing practices: ht
Rick, As far as I'm aware, the 2800 has been proven time-and-again to be incapable of holding a MonstIR in even a moderate wind. I suggest you avoid needlessly repeating this mistake, and implement y
Howard, I should have been clearer in my reply to Rick's e-mail. Rick discussed using an M2 Orion 2800 or a prop-pitch rotator with the MonstIR. The M2 2800 Orion rotator has insufficient capacity to
Rick, I installed two M2 Orion 2800s in 1998, they've very reliably turned a 48 foot boom 15M Yagi on a 200 foot tower, and a 48 foot boom 20M Yagi on another 200 foot tower. Both of these rotators t
Bob, You should remove only the loose rust. If its not loose, just leave the rust there and paint over it. If you attempt to remove tightly adhered rust, you will remove much of the galvanized coatin
Bob, The M2 Orion 2800 is exceptionally reliable and would easily handle your 205CA and XM-240. Based on the comments we've seen in recent days, apparently the Yaesu 2800 is also an excellent perform
Gary, Most rotator manufacturers publish "square foot" ratings for their rotators. This rating does not fully account for the wind dynamics of very large Yagis where much of the wind load is develope
Guy anchor failures are not uncommon. Several Towertalkians have experienced them! 73 Frank W3LPL -- Original message -- _______________________________________________ ______________________________
The synchro used by Telrex is a 400 Hz synchro run at lower than rated voltage at 60 Hz. It also has an unusual small diameter threaded shaft. I suspect you will not be able to find a direct replacem
Noel, Will you have antennas for any other bands near the new 130 foot tower? If not, I recommend just two insulators, one near the tower, and one near the guy anchor. I don't understand how the long
Gary, You're correct that six feet to the first insulator is likely to cause a resonance in the vicinity of 28 MHz in that set of guys. However... Frequent energetic guy motion in the wind will damag
Several Towertalkians asked for clarification on the insulator clevis. I use the Joslyn J732 insulator clevis, you can find a photo at: http://www.macleanpower.com/file.asp?F=AF131CF1571E47758E923C47
Gary, Phillystran cuts easily with a sharp knife, bolt cutter or hacksaw. As with all Preforms, the thimble M U S T be the heavy duty type. Philly is an excellent but expensive solution when you incl
Dick, A 200 feet or longer Beverage will work well on 40 meters. It only needs to be 4-6 feet high. Go for it! Surely you know some ham in the New Smyrna area who'll be happy to loan you a resistor!
following areas with large contester populations: Azimuth Coverage area 22-25 UA4 and UA9 zone 17 22-30 Northern LA OH9 SM2 UA1Z 30-60 Continental Europe (DL, G, F, HA, HB, I, OK, SP, UA, YU etc) 60