Increasing the reflector width while keeping the driver constant will shift frequency response down. Matt KM5VI Hello All, For a 2 element yagi Will increasing the design length of the reflector caus
Hi Jim, Yes I have run finite element stress analysis models of some different antenna designs - mainly to evaluate modifications or to confirm wind loads. As you note, some can really leave you scra
Hi Jeff, I have been using an older 50 HP Ditch Witch model 4020 trencher/dozer for installing conduits and ground cables. If you can get access to one or something similar it should trench 12" wide
P.S. - I should also mention that chain drive trenchers don't tolerate rocks over about 4-6" diameter or large roots very well at all. An inherent shortcoming of these machines is that you typically
Hi Terry, I have installed 1,000's of feet of buried conduit in sizes 3/4" thru 4". I generally assemble runs on the ground and then drop them into the trench. Regarding difficulty in making up belle
Hi Mike, I switched to crimped connectors several years ago without any regrets... Suggestions: 1. Buy good quality connectors. I like the silver Teflon type and buy them in quantity from N5IAW. You
Hi Terry, What do you plan to use for 36 ft mast? Double random section of aluminum pipe? Or are you referring to a telescopic mast of some sort? About 20 years ago I had a 33JR up on a 4-section, 36
I purchased a lot of replacement parts a few years ago from MFJ/Hygain to refurbish/modify six older Long Johns. I found that the hard plastic element end caps are junk. They were splitting and falli
Could be broken springs(I believe there are a total of 4) , stuck brake wedge, broken brake wedge, or a broken brake pin. I feel that they are pretty easy to service and have found that parts are rea
The 1986 UST Catalog shows standard TMM-433HD shipped with 1" x 36" anchor bolts. The 2013 UST Catalog shows standard TMM-433HD shipped with 1" x 27" anchor bolts. I surmise that pull-out rating is t
Hi John, The primary lifting cable which wraps around the drum of the TriEx TM470 is also used as the pull down cable. The pull down end of the cable is terminated at a spring loaded eye bolt in the
For the past 20 years or so, I use a surgical tubing slingshot to launch 1oz to 2oz fishing weights tied to fishing line (about 6# or 8# test) from an old spinning reel. With the right weight I can e
Hi Bob, The improved T2X brake wedge was implemented in 1983. So unless you have a very early model (1977-1983) you should already have the improved wedge. Hope this info is of help. 73 Matt KM5VI I
For what it's worth... here's some mods that I have implemented over the years to improve the reliability of my HyGain rotor installations. I gave up on TB3's in favor of (oversized) flanged pillow b
Hi Tony, I've been getting NEMA 3X outdoor boxes off ebay from Aletlix. They are UV resistant FRP construction with gasketed doors and drip rails on stainless piano hinges. The furnished mounting har
Hi Terry, If you are going with light elements, as I believe I read in your posts, then truss cables can be used to help stabilize the elements both in the vertical and horizontal planes. There is a
Thanks John - I didnt read the full thread and missed the original point. Thanks for pointing that out. Hi again Terry - Regarding building an electrically isolated boom to mast clamp... I have used
Hi Will, Email me directly from address at QRZ.com 73 Matt KM5VI Hello, I need a dimensional drawing for a LM-470 base/tower. Any one who can help me on this one? Thanks, Will K6ND (now /3) Port Roya
Hi Terry, MMANA predicts that moving capacitance hats inboard from 25' to 17' while keeping the total element length the same would: (1) require larger hats to reach the same resonance for a given di
Thanks for the link Paul, This may/may not be relevant, but I found that GDT breakdown voltage tolerance is typically in the range of +/- 20% of DC rating. If the same follows for impulse rating the