I'd just pull in 40-60 1/4 wl radials maximum or as many as I could as long as I could and call it a night. All this planning and worry over something that can't be easily and accurately modeled, mea
Keith Dutson wrote: IMO restoring a rusty 25G is flirting with disaster. Depending on age and extent of rusting, you could be risking a lot climbing a tower like this. Other than minor surface rust t
The tower cllapsed on itself after being struck by the amll plane http://sakrison.com/radio/KFItowercollapse.html Would the presence of the heavy cable(s) have contributed the tendency of the tower t
I have acquired a very used Hustler (now Newtronics) 4-BTV vertical. The metal has the usual light corrosion and discoloring. Should I bother to run over it with a scouring pad? If so what should I t
Actually a 40ft R25 tower bracketed at 8' would probably handle 130 MPH with no antennas installed. When I ran the calcs for my 34ft R25 tower bracketed at 8', it came out to 150 MPH wind survival (6
I read the archive re. a 2002 discussion of balun options for the Hy-Gain TH7DX, and similar beams. I have just acquired a very used TH7DX needing some aluminum repair and thought I'd revisit the bal
I have a homebrew autotuner that includes a small device labeled Ham Radio June 1990 Phasometer. Google shows that Far Circuits offers a PC board for this but I cannot find any details re. the autotu
That's why slopers worked against the tower should be called sloppers instead of slopers. They are sloppy systems that generally, if they work at all, work by good fortune rather than proper design.
Just read this and wondered, does ChromeMoly really need to be hot dip galvanized, or treated in any way? Also, I may have stumbled upon a local source of ChromeMoly (someone I met knows of a racing
Frank Donovan wrote: Doc, For comparitive purposes, Dillsburg Aeroplane Works in Dillsburg, PA sells 2" od x 0.188" wall 4130 Cr-Mo tubing for $9.00 per foot. This is raw Cr-Mo steel, not galvanized.
sabrams@nycap.rr.com wrote: If you spray it in place you will never get the mast out of the bearing. I have a 3" mast that I spray painted and it would not fit onto my precision 3" bearing. I had to
Telex-Hygain TH-7DX, 7 element, Tri-Band Beam 10, 15, & 20 Meters. Dual driven 7 element system w/VSWR less than 2:1 across all bands, incl. all of 10M, front-to-back ratio 27 dB. Diecast aluminum ru
Frank Donovan wrote: I do not have any Rohn 65 for sale; however, I do have for sale a large quantity of new, heavy duty, 24 inch face-width tower manufactured by Granger Associates (Model 789-4). Th
Paul Playford wrote: While at RCA Broadcast I (a field engineer) was asked to commission the first television camera of a new product line. Engineering assured me it met all applicable standards, whi
Eliminate all wires to the tower. Use wi-fi to send digitized audio to the tower base for input to the auto-tuning amplifier. Rotor control also. Supply AC power only and eliminate coax loss, lightn
Jim Lux wrote: The FCC is directed by five Commissioners appointed by the President and confirmed by the Senate for 5-year terms, except when filling an unexpired term. The President designates one o
Pete Smith wrote: Yeah, and imagine how much fun it'll be to file the insurance claim when all that expensive stuff gets fried by a lightning hit. Ahh, yes, who is the greater hassle, lawyers or insu
Robert Shohet wrote: Good point! and we have seen how badly that concept has failed in the "real world". Apple Computer Co. was headed for certain bankruptcy until they hired a barely computer litera
Bernard(wtrone) wrote: For what it is worth, I had a HyGain TH-7DXX 2 ft above the top of the tower and a CushCraft A3WS 10 ft above that on the same mast, for over 10 years, with no problems with a
Is there a Ham app for these things? http://www.arrisistore.com/product.php?pid=251402&PHPSESSID=9089003fa2b7688dc8af1bbdcd22eed0 I have acquired a pair of them used and would like to learn if they'd