N1RR's 2014 Rohn 55G 120ft Tower project == Hi ! I've got a few questions. Here's what I'm doing: Rohn 55 120ft I live in Massachusetts near the northeast corner of Rhode Island. It's a 110 MPH zone.
MA-550 = 435 lbs MA-550MDP = 620 lbs 73 Charlie N1RR -- Original Message -- Hello Couldn´t find the total weight of US Tower MA-555 (MA-550) in the manual Anyone can help me with an approximate t
Re: Using HDR-300 rotors on one control box Any issues I should know about before trying to control two HDR-300's separately (one at a time) with one control box ? -Charlie N1RR _____________________
That's very useful info Bryan ! There's gotta be a few HDR-300 boxes out there that people have no use for after buying a Green Heron box.... Thanks Charlie -- Original Message -- Charlie, I use a HD
I have 7/8", 3/4" 5/8", 1/2" CommScope and Times Microwave hardline which is: Non-corrugated / annular / smooth wall, some has jacket and some does not. What manufacturers & part numbers apply to thi
I didnt say anything about impedence..... I assume it will all be 75 ohm until I connectorize it and test it. This is all older cable from mid to late 1990's before any of the ones you mention or any
Thanks Jim, None of the original spool markings remain. Just the Manufacturer is known. The cable does not have any part numbers, just (Year) manufactured and length markings every foot. It was acqui
Ive just picked up a 402BA but was unaware of the issue with element-to-boom insulators which breakdown at 500-600 watts. I'm told that this particular antenna is an newer vintage and was used at 150
Some ops will stack yagis at the top of each crank-up section. The 472 has 4 sections, about ~20 foot each A two tribander yagi stack of about 72ft over 38ft would work well. Some have even gone to t
The "optimum" stacking distance is related to gain. Higher gain antenna require more spacing to prevent the wavefronts from cancelling. K1EA suggested back in the 90's to space HF monobanders by appr
I am calculating the turning radius that is lost when using two sidemount methods I have on-hand. IIX RM-16 & Ringrotor Turning radius of tower is: From the vertical leg (some distance below the guy
Hans, This idea of lobe steering or tilt is also used on commercial collinear / stacked dipole VHF/UHF verticals to apply an up-tilt or a down-tilt in the main lobe of the vertical to solve terrain/c
I have had four types of temporary towers: Use a standard baseplate and add a 3 foot to 6 foot square plate to it. I had my backhoe guy dig a 6 to 8 foot deep hole. Next we used a chain to lift a pre
I think what some are missing is that the 40M numbers from Tim are based on HIS location in W.PA /OH border and his terrain. The numbers for W1 are much lower. We see higher angle propagation to EU m
Author: CHARLES MORRISON - N1RR <n1rr@comcast.net>
Date: Tue, 3 Jan 2017 02:17:28 +0100 (CET)
My Rohn 55 tower @ 130MPH requires three top guys of 5/16" tensioned to 1100 lbs each. If I use a TA-55 instead of three normal guys, what guying is required ? Ive found nothing about guying these. T
Author: CHARLES MORRISON - N1RR <n1rr@comcast.net>
Date: Wed, 4 Jan 2017 22:21:47 +0100 (CET)
Does anyone have a PDF of Rohn's TA-55 Torque Arm Stabilizer "star guy" they could share with me? If you have a paper copy, can you scan it and email it to me ? Thanks, -Charlie N1RR n1rr@n1rr.com __
Author: CHARLES MORRISON - N1RR <n1rr@comcast.net>
Date: Sat, 7 Jan 2017 01:37:23 +0100 (CET)
There are no adequate documents for TA-55 on the net or from Rohn other than a depiction / illustration of the part. Ive consulted a PE with extensive tower experience and we have made a plan. This w
Author: CHARLES MORRISON - N1RR <n1rr@comcast.net>
Date: Thu, 2 Feb 2017 15:05:37 +0100 (CET)
6ELE: NW3Z OWA or W2PV design = 48-54ft boom. 7ELE: Scale a DL1BU design. I have a 10M 44ft 7EL design which I have up at 105ft. It's a hybrid of OWA & a DL1BU. It would be ~88ft @ 14MHz. These would