One more suggestion, considering the parking behavior of the subs I've seen. Buy two 12' sections of 5' high horse/cattle portable steel panels (temporary corral fencing) that pins together and make
If you use Never-Seez make sure it is the nickel particle type, not copper. The copper will react with the aluminum. There are also other brands with aluminum particles. NoAlox works well also, it ha
Try the DX Engineering Saddle Clamps as they have a lot of contact area with the mast with the cast aluminum saddle. The 2" size comes in two bolt diameters, obviously the 3/8" u-bolt can handle more
I think "teeth" are a bad bet to get a good grip on an alloy steel mast which will have yield strength from 80 to 125ksi. The high end of that range is nearly "file hard" so it will be very unlikely
see http://www.nytimes.com/2012/02/10/us/jamesburg-earth-station-can-be-yours-for-3-million.html _______________________________________________ _______________________________________________ TowerT
this does most of what you want, no leds though. http://www.ebay.com/itm/130545242235?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 Grant KZ1W _______________________________________________ ___
Check whitecap.com for fall protection harnesses, many with D rings for climbing. Lots of choices $80 and up, lots of accessories. Search on harness. Grant KZ1W ______________________________________
TFE insulated coax's offer the most power handling in the smallest diameter. For example, RG303/RG142 is rated 1900 volts rms, is generally available surplus/ebay and PL259 crimp connectors are readi
Kudo's and many thanks to Steve for DEM files for my QTH. As others mentioned, the Microdem/DEM web site is impossible - gratuitous GUI violence by the site owner makes no edition of published instru
You also can use Yagi-Mech software from DX Engineering to check Yagi wind and ice load stresses. It's a little confusing about how to enter sleeved sections, but other than that it has an ok Windows
At the risk of waking the sleeping giant prior thread, here is a comprehensive free manufacturer's (Cadweld) text on grounding and lightning protection. 131 pages of excellent content. copy the url b
Also, accumulated pigeon excrement signals to pigeons "this is a safe place". So cleaning helps to deter nesting. Politically incorrect message follows: However, I've had the most success leaving a d
My 589HDX base attachments are 6 structural solid rods and only 36" into the concrete. It seems to me that bottom half of the Rohn 6' section may only be there as part of the concrete rebar, it seems
Mill lots are usually cast billet sized - all of one casting (about 6 tons as I recall from an Alcoa plant visit) rolled/drawn into what you want, so it is unlikely you will get the attention of a mi
I've owned three TH7DXs, first one in 1978. #1 & #2 were made by HyGain, it's now made by MFJ. I think that before that Telrex made them and as far as I can tell they are mechanically identical. I th
Barry, Thanks for the info re dates, my slip up on when I was at the first QTH with a TH7DX. I definitely had a TH7DX but as I think more about it, it was later, probably 1982. Memory is the second t
Having recently installed 1000 feet of 9913-F7 and 1500 feet of Bury-Flex I thought I pass along some observations: The 9913-F7 braid "prints" on the outside of the cover, which I think makes it more
I just pulled three x BuryFlex/9913 plus one x LDF4.5 thru 140' of 3" PVC conduit with 3 x 90deg sweeps. I used lots of Ideal Yellow 77 Plus cable pulling lube. One person pulled and one fed about 3'
812 pages of everything you might need to know, lots of clear explanations, many equations, & implementation details. (includes EMP protection) http://www.repeater-builder.com/antenna/pdf/mil-hdbk-41
I was looking for the work that one of my professors (Paul L. Hoover) was purported to have patented and made millions from - protection of oil well fields and oil storage systems from lightning. I c