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Latest Topics

Topic Created Posts Views Last Activity
Antenna analyzer vs feedline type Sep 21st 2012, 14:37 1 1,686 on 21/9/12
USB to Serial Port problems--Prolific Drivers Aug 3rd 2012, 18:27 1 1,920 on 3/8/12
Italian Phishing emails! Dec 13th 2011, 14:20 1 1,560 on 13/12/11
John K0GMO needs help designing SS Amp Nov 17th 2011, 15:53 1 1,450 on 17/11/11
1 Farad Capacitor to Eliminate Headlight Flicker? Oct 19th 2011, 13:14 4 2,476 on 9/11/11
History of Relay Rack Dimensions? Oct 17th 2011, 12:58 2 1,693 on 25/10/11
Miswired Selsyn Oct 13th 2011, 17:51 1 1,502 on 13/10/11
Stealth Antenna wire Sep 12th 2011, 12:51 2 2,136 on 13/9/11
Designing a ham bench Aug 29th 2011, 12:38 2 2,342 on 29/8/11
Can't find recent Hint and Kink Aug 26th 2011, 13:01 1 2,138 on 26/8/11

Latest Posts

Topic Author Posted On
RS/RST in contests KB9YOJ 1 day, 7 hours ago
Many VHF contests only require a grid square or location identifier as the exchange.

But, the signal report can be useful, as it allows you to "synchronize" with the other station, or give a slight but useful delay if someone has transmitter issues like first character shortening.

Zack Lau W1VT
ARRL Senior Lab Engineer
Analog Atomic Wall Clock With Silent Second Hand No Battery WD6EJN 2 days, 6 hours ago
Atomic clocks use batteries to allow for better reception of the 60 kHz WWVB signal. Harmonics of AC power disrupt WWVB reception. GPS clocks operated inside building typically need external antennas to receive satellites.
This project replaces the electronics in a standard quartz wall clock with a circuit that uses GPS satellites to get the precise time. This page also points out that you can buy movements by Citizen and Seiko that have a continuous sweep second hand that is silent.

Seiko QXA628KRH Wall Japanese Quartz Wall Clock
This clock could be used for either 12 or 24 hour time, as there are markings for hours 13 through 24. But, it does run on an AA battery--perhaps you could redesign it to run on solar power?
This company sells a 24hour clock you can plug into to your computer that gets accurate time via Internet servers. No AA batteries and quiet operation with an analog dial.

Zack Lau W1VT

RT Systems may sell a program with the functionality you need.
Are Jacob's Ladders legal? ka2ddo 1 week, 4 days ago
Jacob's Ladders and the FCC
Operating Jacob's Ladders (as well as Tesla coils) are broad-band RF sources and can interfere with radio, TV, maybe cell phone, cordless phone, and other communications equipment. There have been reports of the FCC tracking down and fining people for this interference - I don't know if these stories are true but it is definitely something to think about before running your creation for an extended period of time, at least. The FCC would probably confiscate your setup as well - which would likely be more traumatic than the fine (as hefty as it might be!) Perhaps, consider a Faraday cage in addition to the Plexiglass ozone shield :-).
Antenna configuration-Newbie question km4ivh 1 week, 4 days ago
How about a flagpole antenna? You could put one up for Memorial Day!"

Zack W1VT
ARRL Senior Lab Engineer

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