There is no problem with correctly assembled N connectors at these power levels; but there is a risk of failure if the centre pin is not mated correctly. This can happen when N connectors with a floa
Any triangle system can be used with either two or three elements energized - check with ON4UN's book for details. In either case, the most practical and versatile system for beam switching is the eq
The Spiderbeam is another wire/fibreglass beam that was designed for DXpeditions and has a good track record: www.spiderbeam.net -- 73 from Ian GM3SEK _______________________________________________
"Or both"... interesting idea - has anybody here used it? On a smaller scale - five posts for verticals, rather than a tower - I'll soon have 20 of these anchors to put in, so would welcome any and a
No, the extra ionisation was too localised to make any dramatic difference. What they did find was radioactively contaminated rainwater running down lightning conductors... and if one of the radioact
A slightly frivolous reply to a very serious question... The Royal Navy's way of dealing with the risks around remotely operated gun mountings is to post a helpful warning notice. I found this messag
[...] Extending HFTA to vertical polarization has to be top of everybody's wish list... but the whole problem is much more affected by ground conductivity and permittivity a long way out from our ant
If Bob (who started this thread) buys the ARRL Antenna Handbook to get a copy of HFTA, he'll find that author N6BV approaches the whole problem in a radically different way. Instead of jumping straig
This is one of those old approximate concepts which gives a useful general understanding, but it is no substitute for modern modeling techniques. For a general discussion, see: http://www.ifwtech.co.
Author: "Michael White W5NIG" <tower@coffeepower.net>
Date: Sat, 3 Dec 2005 12:39:19 -0600 (CST)
Hey Mike, Oddly enough I went through the same round of questions with a lot of guys off list. I wound up buying the M2 3ele, mostly because of a great cost vs performance and excellent customer serv
Don't worry - INSIDE the station, you are not expecting large lightning currents in the RF ground bonding, so the grounding bolts on the backs of the rigs are already quite big enough. The purpose of
Cable radiation, anyone? I've yet to see a review of a CFA/EH that demonstrated the reviewer understood that possibility, took serious precautions against it, and then measured it. Lacking all that,
Tome makes some fair points... Wouldn't try to "stop" anybody anyhow, and certainly don't want to get into a Holy War about it (oops, sorry Steve :-) However, we do have to recognize that the same d
Sorry, Tom, I have a big problem about using the term "balun" around any antenna that cannot ever be "balanced" as you define it - and isn't even intended to be. I agree completely with your definiti
Practical experience of moonbouncers and others is that N connectors will typically handle 700-800W continuous at 432MHz, or 1.5kW if they're absolutely perfect. At lower frequencies, the reliable po
That's about normal: given a choice of three names for something, radio amateurs will ALWAYS choose the one that creates the most confusion. The original zeppelin antenna was intended to be trailed b
A few years ago, I asked for brainstorming solutions to this problem via the magazine column. There were several interesting suggestions (eg suspended weights in two deep holes in the ground, optiona
Interesting... the power companies in the UK take a different view. In the event of a neutral break in their local distribution system (230V single-phase, neutral close to earth potential) they'd rat
In case this point was buried in my previous post, when SWR-testing the feedline and antenna, it's always a good idea to leave a 50R load connected in the shack. At each place where you break the fee
Something very similar happened here a few weeks ago, and it turned out to be a bad PL259. The center pin had become intermittently open-circuit when plugged into the jack at the end of the feedline,