|Joined:||Sat, Apr 4th 1998, 00:00||Roles:||N/A||Moderates:||N/A|
|Forums demoted?||Aug 18th 2013, 18:36||10||1,580||on 28/8/13|
|Why isn't there more action on ARRL forum?||Sep 13th 2012, 00:48||11||5,087||on 29/1/13|
|Forum avatars?||Aug 17th 2011, 16:45||5||2,294||on 21/8/11|
|Operating Furniture||Aug 17th 2011, 01:52||10||5,197||on 27/12/12|
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|General Comments||Jul 24th 2011, 21:46||22||9,193||on 29/7/11|
|Solar Array Interference||NS6Q||4 days, 22 hours ago|
|No installations nearby, so no problem yet. It is something to worry about, however. Check the April 2016 QST for K1KP's experience. A quiet installation is possible, if you take great care, but a typical installation is likely to be a problem. I would never take the risk myself (unless the installer could guarantee no RFI), but there's nothing to stop a neighbor from doing it.
You can always restrict operating until after sundown -- or maybe have a kill switch that shuts off the system while you're operating. We need more real-life data on how hams are dealing with these issues!
73 Martin AA6E
|Swapping out xtal - power on or off?||KE0KCG||on 19/1/17|
|The safest thing is to power the radio down, but chances are your procedure is OK, too. Be careful of possible high voltages inside the radio.
73 Martin AA6E
|How exactly does a CW rig work?||KE0KCG||on 19/1/17|
For CW reception, the receiver mixes the incoming signal (a pure RF frequency, with on-off keying) with another frequency, called the "local oscillator" -- or in older rigs, the "beat frequency oscillator". (A mixer generates a signal having a frequency equal to the difference or sum of two input signal frequencies.) The local oscillator is more-or-less the frequency that your receiver tuning dial reads. (I'm simplifying here.) If you tune 500 Hz off from the incoming signal, you will hear a 500 Hz tone, with the same on-off keying. As you tune slowly back and forth, the tone frequency will vary according to the offset from the incoming signal.
I hope that helps a little.
73 Martin AA6E
|LIGHTNING STRIKES TO HEXBEAMS||NT0Y||on 4/1/17|
|The "hissing" noise is probably corona discharge. This will occur with a grounded conductor (especially with a sharp point like a lightning rod) when there is a high electrical field from an overhead cloud. I don't think there's anything you can do to attract or repel lighting by changing the conductors around (eg. grounding them). The main thing is to consider what will happen *when* you get struck or there is a nearby strike -- what path the current is going to take. You need good grounding at the base of the tower and preferably lightning arrestors (like Polyphasers) in your coax lines and rotator lines. (At the tower base is good, and possibly also at the entry to your house.) The hope is to direct the juice directly to ground ASAP, protecting your equipment and your house.
Effective lightning grounding is a tricky business. The typical amateur will try to do something that "looks right", but there is no simple way to know if you've done it properly until the big one comes. (And don't believe everything you read on the Internet!)
73 / GL Martin AA6E
|Anybody able to explain this energy wave?||KJ6YYC||on 23/12/16|
|Apparently it was an instrumental artifact. Not real data. (Note added to youtube video post.)|