I don't have the problem on the 2nd or 3rd harmonic of 3579 KHz, but do on have a tone between about 14.316 and 14.318 MHz.
73s de Dave KJ6CBS ________________________________ From: Jim Wiley <[email protected]> To: Grant Youngman <[email protected]> Cc: [email protected] Sent: Sun, April 24, 2011 1:11:44 PM Subject: Re: [Elecraft] 14.316 help! Grant et al - This is no mystery - it just seems like one. 14.316 (or 14.317) Mhz is the 4th harmonic of 3.579 MHz, the common color burst frequency. Color burst crystals are used in an incredible variety of consumer devices. These days, the oscillators are usually configured as a digital gate oscillator (read - square wave) that is very rich in harmonics. If you take the time to look, you will find signals at all the harmonics. We notice it mostly on 80, 40, and 20 meters because that is where we have efficient antennas and receivers optimized for reception on those same frequencies. Is this a problem? You bet it is. Are these devices in violation of the part 15 rule that says that such devices may not cause interference to licensed services? Yes, they are. However, there is a fly in the ointment. The FCC's rules for interference mitigation say that (paraphrasing here) "It's not interference until someone complains!" Unfortunately, the burden is on you (the ham) to identify which device is causing the problem, and then notify the device owner that his gadget (TV set, computer, stereo set, alarm clock, microwave oven, kids toy, calculator, FAX machine, treadmill, coffee maker, video game, . . . . . ) is causing interference. They you get to educate the consumer, an always interesting endeavor. So, unless you have complained to the FCC and the manufacturers and the stores that sell the devices and the end users, it's not interference! Ain't that great?! The process of informing the miscreants will keep you entertained for some time. Thank you local congress critter for failing to enact more rigorous standards concerning interference from consumer devices. They are the ones who responded to the lobbyists from the electronics industry that promised this would never be a problem, and voted to water down the rules accordingly. Have a nice day. - Jim, KL7CC Grant Youngman wrote: > I've had a weak 'carrier' in this spot for years. Used to have to endure it > for >the Icom Net at 14.317 in the old days. No clue what it is. > > > Grant/NQ5T > > Sent from my iPhone > > On Apr 24, 2011, at 2:29 PM, Fred Jensen <[email protected]> wrote: > > >> Mine is at 14317.00 and is moderately weak. I >> > _ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
