My long haul 802.11 ISP radio tech tells me that the regs are ERP based, so power output plus antenna gain can't exceed a spec (he is a Ham). Just like most broadcast licenses. Not likely this is eas
I've just helped recommission one of the former KABC vans for a virtual classrom, satellite link, 802.11, 2m, 70cm, & GMRS radios, etc. for the upcoming ARLISS rocket launches (see aeropac dot org) T
The TFE augmented pulling grease was found at McMasterCarr, not that much more expensive as we used just less than one quart, and it sounded like good insurance as we expected problems. It went easie
The vertical antenna literature recommends loading a short vertical, efficiency worst to best as bottom coil, center coil, capacity hat. More top capacitance needs less coil inductance if both are us
see McMaster http://www.mcmaster.com/#cable-support-grips/=90qf9h also sometimes called Kellums grip Grant, KZ1W _______________________________________________ ______________________________________
A problem can occur with new ropes that have residual weaving/spinning lubricants in them. This can be washed out. A lot also depends on the rope material, construction, hardness of the lay, etc. Sai
Why use 9913 to make chokes when smaller diameter PTFE cables are available? At 30Mhz, RG's 142 (3Kw), 223, 304(6Kw), all handle max legal power plus with some VSWR headroom, and 316(1Kw @ 30Mhz, 2.2
I'm considering the 180S or 280S also, likely the shorter (not Magnum) versions. The Tornado variable pair of inductors at the feed point (squeeze/expand the coils) appears to be a good idea at least
A rolling hitch is a pretty handy knot for lifting masts or pulling on cables or ropes. see http://www.youtube.com/watch?v=vEV0p-QNPTU BUT, I wouldn't use it when there is cyclic tension as it is lik
It is likely 75ohm if it is CATV distribution coax, so also test with that value resistor. There is also a lot of 50ohm cell base station hardline in the market. I picked up N connectors for hardline
It is going to have a pretty high impedance, just how high is hard to predict but the 50ohm swr is likely higher than 10. So an "open wire feeder" and a matching section is called for. For something
I'm also in the market for a 2el 40m beam, so would appreciate inputs. The W6NL Moxon mods to the XM240 look particularly interesting, anybody build one? My beam will be at 92' among the tall pines o
I think your criteria should be reliability, reliability, reliability since a winch/hoist failure has dramatic consequences. For me that rules out any Chinese made gearbox and I know from experience
If the mast isn't otherwise grounded, it makes sense to protect the ball bearings in your rotor and thrust bearing if a ball bearing design. Otherwise, static charge from wind or atmospherics will co
What's the advice for top to bottom grounding of a crank up? A 5 section HDX589 in my case. Are some widget connectors available to mate and electrically connect sections together with full extension
I bought a used LM354 which was in a guys back yard. He single handed it into the street with a two wheel dolly that had small trailer pneumatic tires. If the tower is balanced on such a dolly it is
I had some tree work (dead limb clearing, felling, antenna hoist lines installed) done on several 100 footers recently and carefully watched the climbers and talked to them about their gear. Some obs
If anybody wants to buy a 20' x 8'6" bed Carson 2 axle electric brake flatbed trailer, 7000# GVW, 2 5/16 ball, torsion hitch parts, you can have mine for $2000, located in east San Jose, CA foothills
Having worked with the safety and environmental folks at NASA Ames (we were going to buy some land for private use) it seems they work they way of all bureaucrats. It is always safer (for their jobs)
Your MFJ may not be "hosed" because it is sensitive to other frequency RF as it energy detects broad-banded. Mine is unusable on antennas because of a 50kw AM band tower about 1 mile away. OTOH my AI