14.316 help!
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Ok on the MA5V vertical I can hear a carrier on 14.316 and on the dipole the carrier is twice as bad on 14.316 pretty much from 14.315-14317 is unusable. I was thinking this was an internal birdie but would changing antennas make a difference? Now I suspect its something local. Anyone else noticed this? If it is something inside the radio causing it is their any mod I can do to at least move it off the Elecraft SSB net freq?
wt5y ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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John you weren't hearing things, I heard the same strong tone. I was able
to notch it out but it was bad nonetheless. 73, John N2HMM -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of John Cooper Sent: Sunday, April 24, 2011 2:39 PM To: elecraft Subject: [Elecraft] 14.316 help! Ok on the MA5V vertical I can hear a carrier on 14.316 and on the dipole the carrier is twice as bad on 14.316 pretty much from 14.315-14317 is unusable. I was thinking this was an internal birdie but would changing antennas make a difference? Now I suspect its something local. Anyone else noticed this? If it is something inside the radio causing it is their any mod I can do to at least move it off the Elecraft SSB net freq? wt5y ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by John Cooper
Mine is at 14317.00 and is moderately weak. I suspect it is an Ethernet
signal. I host and power the local wireless RAP at the top of my tower in exchange for free moderate speed i'net. Several weak constant carriers appeared on most bands when they installed it. I suspect they may be harmonics of clocks or local oscillators in the radios, and of course, the ubiquitous Ethernet junk. It could be your neighbors, but since yours is strong, you might try shutting down your i'net connections. If that gets rid of it, wrapping the CAT5 and any router/modem power cable[s] through toroid[s] up close to the devices might do it for you. 73, Fred K6DGW - Northern California Contest Club - CU in the 2011 Cal QSO Party 1-2 Oct 2011 - www.cqp.org On 4/24/2011 11:38 AM, John Cooper wrote: > Ok on the MA5V vertical I can hear a carrier on 14.316 and on the > dipole the carrier is twice as bad on 14.316 pretty much from > 14.315-14317 is unusable. I was thinking this was an internal birdie > but would changing antennas make a difference? Now I suspect its > something local. Anyone else noticed this? ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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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 <[hidden email]> 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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That tone has been there for years. As long as I remember.
73 de Ke4wy Jim Sent from my compound. On Apr 24, 2011, at 3:38 PM, Grant Youngman <[hidden email]> 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 <[hidden email]> 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:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Grant Youngman
Hi,
That's almost certainly the 4th harmonic of an NTSC TV color burst oscillator. It should zero beat at 14318kHz. The one I hear (about S3) has multiple tones a few hundred Hz apart so the manual notch doesn't do a perfect job of eliminating it but it helps a lot. It's not necessarily from your own TV but it might be worth unplugging the TV and see if it disappears or at least weakens. Mine is not primarily from my own TV. AB2TC - Knut
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In reply to this post by Grant Youngman
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 <[hidden email]> 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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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 <[hidden email]> To: Grant Youngman <[hidden email]> Cc: [hidden email] 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 <[hidden email]> 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:[hidden email] 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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It's the 4th harmonic
Sent from my iPhone On Apr 24, 2011, at 3:35 PM, David Guernsey <[hidden email]> wrote: > 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 <[hidden email]> > To: Grant Youngman <[hidden email]> > Cc: [hidden email] > 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 <[hidden email]> 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:[hidden email] > > 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:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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I realize it is the 4th harmonic. I do not have any problems with any harmonics
of 3579 KHz except the 14316 KHz (4th harmonic). Thus, I wonder if the problem is really from the color burst crystal. 73s de Dave KJ6CBS ________________________________ From: Grant Youngman <[hidden email]> To: David Guernsey <[hidden email]> Cc: "[hidden email]" <[hidden email]> Sent: Sun, April 24, 2011 1:39:51 PM Subject: Re: [Elecraft] 14.316 help! It's the 4th harmonic Sent from my iPhone On Apr 24, 2011, at 3:35 PM, David Guernsey <[hidden email]> wrote: > 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 <[hidden email]> > To: Grant Youngman <[hidden email]> > Cc: [hidden email] > 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 <[hidden email]> 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:[hidden email] > > 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:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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David - No, the problem is not the crystal. It is the _oscillator_. The oscillator is usually a more or less square-wave type, which is rich in harmonics. These harmonics are then radiated by the circuitry in the offending device, and make their way to your station. The function of the crystal is to control (stabilize) the frequency on which the oscillator operates. Color burst oscillator crystals are used so much because they are both inexpensive and easy to use. They are inexpensive because literally hundreds of missions of them are manufactured. For this reason, there have been created a large selection of IC chips that use the color burst frequency as the primary timing function for whatever device into which they are incorporated. Many of these chips are very simple to use, in most cases requiring no components other a chip (manufactured specifically for the intended function) and the crystal itself to create the desired device. - Jim, KL7CC David Guernsey wrote: > I realize it is the 4th harmonic. I do not have any problems with any harmonics > of 3579 KHz except the 14316 KHz (4th harmonic). Thus, I wonder if the problem > is really from the color burst crystal. > > 73s de Dave KJ6CBS > > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Aww nuts! I meant hundreds of millions, of course! - Jim Jim Wiley wrote: > <snip> They are inexpensive because literally hundreds of missions of them are manufactured. > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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On Sun, Apr 24, 2011 at 4:41 PM, Jim Wiley <[hidden email]> wrote:
> > > Aww nuts! I meant hundreds of millions, of course! > > - Jim > > And each one has a mission, should it choose to accept it. Tony KT0NY ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Jim Wiley-2
On 4/24/2011 3:37 PM, Jim Wiley wrote:
> David - > > > No, the problem is not the crystal. It is the _oscillator_. The > oscillator is usually a more or less square-wave type, which is rich in > harmonics. These harmonics are then radiated by the circuitry in the > offending device, and make their way to your station. > > > The function of the crystal is to control (stabilize) the frequency on > which the oscillator operates. Color burst oscillator crystals are > used so much because they are both inexpensive and easy to use. They > are inexpensive because literally hundreds of missions of them are > manufactured. For this reason, there have been created a large > selection of IC chips that use the color burst frequency as the primary > timing function for whatever device into which they are incorporated. > Many of these chips are very simple to use, in most cases requiring no > components other a chip (manufactured specifically for the intended > function) and the crystal itself to create the desired device. > > > - Jim, KL7CC > > > > David Guernsey wrote: >> I realize it is the 4th harmonic. I do not have any problems with any harmonics >> of 3579 KHz except the 14316 KHz (4th harmonic). Thus, I wonder if the problem >> is really from the color burst crystal. >> >> 73s de Dave KJ6CBS >> >> >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > harmonics. So if the oscillator is putting out essentially a squared wave form, the fourth harmonic is going to be either non existent or many dB down. This thread suggests to me that the 14.316 MHz signal may be from some other source. A bit off topic. I have a nasty 2304.150 MHz noise source that sounds digital. It comes and goes. What could it be coming from. Don, N0YE ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Grant Youngman
On 4/24/2011 1:39 PM, Grant Youngman wrote:
>> 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. > It's the 4th harmonic Digital TV receivers do not use a 3.57954528+ MHz subcarrier like NTSC (analog) receivers do. In digital TV protocols color information is carried in the digital data stream. -- 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by David Guernsey
If you are looking for an explanation of why the 4th harmonic, you
will have to actually find the offending device and analyze its circuitry. As to whether that really is the problem? There are billions of 3579 crystals out there embedded in everything imaginable, far more in things that aren't TV's than are. I can hear 14316 on every radio I have that can tune there, and only one of them is a K3. Assuming that only odd harmonics get radiated is purely old world analog thinking. Divide by powers of two DIGITAL frequency locking devices would be incredibly common and would be far more likely to generate EVEN harmonics. I would offer that picking a QRP net frequency with 14316 in it is just asking for it. 73, Guy. On Sun, Apr 24, 2011 at 5:17 PM, David Guernsey <[hidden email]> wrote: > I realize it is the 4th harmonic. I do not have any problems with any harmonics > of 3579 KHz except the 14316 KHz (4th harmonic). Thus, I wonder if the problem > is really from the color burst crystal. > > 73s de Dave KJ6CBS ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Phil Kane-2
Good point, but it could be someone's NTSC box that has an HD
converter in front of it. Still - hearing an even harmonic seems odd. Or another piece of shack equipment that uses a color burst xtal..... 73, matt W6NIA On Sun, 24 Apr 2011 17:02:52 -0700, you wrote: >On 4/24/2011 1:39 PM, Grant Youngman wrote: > >>> 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. > >> It's the 4th harmonic > > Digital TV receivers do not use a 3.57954528+ MHz subcarrier > like NTSC (analog) receivers do. In digital TV protocols color > information is carried in the digital data stream. > >-- 73 de K2ASP - Phil Kane > Elecraft K2/100 s/n 5402 > >______________________________________________________________ >Elecraft mailing list >Home: http://mailman.qth.net/mailman/listinfo/elecraft >Help: http://mailman.qth.net/mmfaq.htm >Post: mailto:[hidden email] > >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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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No pun intended, I presume! - Jim, KL7CC Matt Zilmer wrote: <snip> Still - hearing an even harmonic seems odd ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Matt Zilmer
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In reply to this post by Phil Kane-2
It could also be another device that uses a crystal frequency of 14.31818 MHz. That is also a very popular Microcontroller frequency.
You might also want to look at the computer video card since it probably generates this frequency. Maintaining a very stable frequency is much easier when you divide down from a stable source. If you have an RGB monitor, especially one that is CRT-based, then this is a likely culprit. Jack Brindle, W6FB On Apr 24, 2011, at 5:02 PM, Phil Kane wrote: > On 4/24/2011 1:39 PM, Grant Youngman wrote: > >>> 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. > >> It's the 4th harmonic > > Digital TV receivers do not use a 3.57954528+ MHz subcarrier > like NTSC (analog) receivers do. In digital TV protocols color > information is carried in the digital data stream. > > -- 73 de K2ASP - Phil Kane > Elecraft K2/100 s/n 5402 > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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