My limited understanding indicates that the highest current (and therefore the worst corrosion) flows between the steel anchors and the copper ground system, assuming a reasonable electrolyte (earth)
Pete, When sweeping feedlines at cell sites, we use (max+min)/2 (over the frequency range of interest) for cable loss (cable terminated in a precision short). This gives a number that is somewhat (20
I've never had occasion to use a male connector on 1-5/8" - I assume you're doing that because that's what you happen to have? But I've used L7PNF and L7PDF connectors on RFS cable in a pinch, and th
Is that the price for each tower, or for all of them? Steve K8LX _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@conte
Rest assured though that shackles ARE a fairly common component of engineered guy wire systems. On permanent installs the bolt and nut pin type is preferred, but the screw-pin type is fine as well. T
Jim, Like you, I can tape up a connection with 33 that is positively hermetically sealed. Many folks can't seem to however, and that is one reason why, in the commercial world, the standard has devel
The advantages of good 1/2" double braid rope for a tram line: 1) Plenty strong - 10,000 lb breaking strength, 2400 lb. working load. 2) Has a *small* amount of stretch available, which acts to lesse
This all depends on what rope you use, and what you are using to tension the tram. If you have a stretchy piece of nylon and a ratchet puller with 6' of pull, yes, it's a problem. If you have a good
Craig, UCF-114 is corrugated copper hardline. RFS calls it "Ultraflex" cable, but being 1-1/4" diameter, it's not really very flexible. UCF is similar to Andrew VXL cable. It's not what you want for
It's supposedly happened on some larger commercial towers, but I'm not sure where. On my Philly guyed ham towers I carefully tape the ends (forming a cone) with good ole Scotch 33, which seems like i
Pete, This is perfectly normal behavior - I sweep feedlines on a regular basis with Anritsu Sitemasters, and usually use (highest peak + lowest valley)/2 as my cable loss value. A short (instead of a
Just in case anyone is interested in what a typical set of sweeps, from a typical PCS feedline looks like, I uploaded a pdf file to: http://www.box.net/public/tedic3zmd0 This feedline happened to be
Dick, I just purchased a 500' reel from Tessco for $433, which beats most other sources on price. I use it for rotator loops - otherwise, regular LMR-400 clones (as low as $.33/ft) would make more ce
Yes, I've got 7/8" Heliax going up the towers, and LMR-400UF from there to the antenna feedpoints. LMR-400UF *Superflex* is probably similar to what you use - it's got a stranded center conductor and
Dave, It seems to me that when you model station B (located at ground level and fairly close to the hill) coming back at you, you are not producing diffraction info that's relevant to a skywave comin
RFC-1703-T Steve K8LX _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailm
My source for the RFC-1703-T has been RF Connection, and it's still on Joel's web site. It sounds like an RFI part number, but may not be. I can verify though that it is sized correctly for LMR-400 &
It's not uncommon to use a smaller guy when doubled, and therefore a smaller amount of initial pre-tension. However, rarely do you see pre-tension on a given strand to be way less than 10% of rated b
Steve, Here's a spreadsheet I created a few years ago that let's you plug in any length (in feet) and it will calculate the corresponding loss for the various cable types (including LMR) and frequenc
IMO, this is the most important advice there is. If there are no complaints from close neighbors, you rarely have a problem. My neighbors actually showed up en masse in my defense at a zoning hearing