When I had a TH-7, I replaced the BN-86 with the BN-4000. The latter worked fine for high-power contesting for years. The replacement was induced by a mechanical failure of the BN-86 that was unrelat
Possibly a rescue helmet. I use a Petzl: http://www.petzl.com/petzl/ProProduits?MotRecherche=Quick+Search&pays=0&Lang ue=en&Activite=22&Famille=3&SousFamille=0&Produit=430&Conseil=&ProduitAssoci e= 7
I'm not an expert in this, but one good reason is that it keeps the guys above head level. This reduces the chances of someone running or driving into a guy wire and getting hurt or damaging the guy.
Great story, Don! Congrats on a great deal and a job well done. Murphy must've been asleep that morning. 73, Dick WC1M _______________________________________________ See: http://www.mscomputer.com f
I was very shocked to receive this news. Bill was still a young man. It's a terrible tragedy for his young family and I pass along my deepest condolences to them. This is also a great loss for the co
I would not use 9913 on a crankup tower. It's way too stiff and will bow out. Over time, the constant bending will cause the center conductor to migrate, affecting the cable impedance. I initially us
I don't like it. On many types of coax, the threads can barely be screwed over the jacket alone. If you wedge the shield braid in between, it will be shredded as you screw the connector on. 73, Dick
The Ham IV will probably do the job. I use a Tailtwister on my MA-770MDP with a 4-el 20m yagi with a 30' boom and it works fine. It also worked fine for years with a TH-7, the windload and weight of
I agree that the windload must be considerd. Technically, the MA550 should be able to handle the 4-el SteppIR. I believe the tower is now rated to either 60 MPH or 70 MPH with up to 10 sq. ft. of ant
HFTA is a terrain analysis program developed by Dean Straw, N6BV, of ARRL. It comes free with the ARRL Antenna Book and includes a program called MicroDem that is used to capture and process USGS ter
Oops. I knew 6dB figured in there somewhere, but I thought it was due to a dipole being 3dB over an isometric radiator in free space, then a dipole over ground being 3 dB over a dipole in free space
I just contacted Fluidmotion about shipment of my 4-el. They replied with tracking numbers the next day. I also got an e-mail from UPS with the tracking numbers. The beam was shipped 8 weeks and two
EZNEC gives similar results -- a 40-2CD at 69 feet has a radiation angle of 27 degrees, while the same antenna at 79 feet has a radiation angle of 24 degrees. Three degrees wouln't be worth the work
EZNEC shows the gain increasing about half a dB from 69 to 79 feet. However, it also shows the gain dropping back .5dB at 110 feet, where the angle is more desirable. I suspect these minor gain diffe
My conduits terminate in metal utility boxes. One is mounted on a panel supported by 4x4s next to a tower. Coax runs from all antennas enter the box via Polyphaser bulkhead feed-through lightning sup
_______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any quest
Bob, I agree that consumer GPS readings may not be accurate enough to compensate for terrain with lots of variation. Elevations on my steep hillside location can vary considerably in just a few feet,
Pete, If you haven't done so already, it would be a lot cheaper to make up a set of switchable bandpass stubs, ala the designs on K1TTT's website. A bit more work, of course. Stubs got rid of most of
Top Ten makes good SO2R switches, too. I've been happy with them. Different approach -- separate A/B relays for each antenna and separate 1-of-6 relays for each radio. This might provide better isola
I agree with most of what Gene says here, but still maintain that in some installations, like my own, it's best to use suppressors at both the tower and shack ends of the main coax run. As in Gene's