| Home |
| Search |
| Today's Posts |
|
#11
January 30th 04, 08:56 PM
|
|||
|
|||
OK. I'm going to reveal my secret idea, so PLEASE don't tell anyone.
Take one old farm silo. Fit it with an old sweat 16 speaker system, or something big-- at it's bottom. You'll need a big amp as well. Open the top. This bugger should resonate somewhere around... Lets see...silo...about 30 feet tall...well about half the frequency of 16' pipe organ pipes. In the sub bass range. Oh yea, make sure the silo is tall enough to get below the audible range. Find another the same size or several around the country. There you have it. Sub audible CW. How far do you think it'll travel. I suspect you may need some elephant repellant. No, it IS to keep elephants away. But, you say. There aren't any elephants anywhere on this continent. SEE! it works! 73 -- Steve N, K,9;d, c. i My email has no u's. "Curious" wrote in message om... What would I hear on a 1Hz AM reciever? |
|
#12
January 30th 04, 10:06 PM
|
|||
|
|||
|
On Fri, 30 Jan 2004 08:26:45 -0800, Cambio hath writ:
Some interesting reading about Radio Waves below 22 kHz at URL: http://www.vlf.it/ Ya, but.... 3Mcs - 30Mcs == HF 300Kcs - 3Mcs == MF 30Kcs - 300Kcs == LF 3Kcs - 30Kcs == VLF 300cs - 3Kcs == ? VVLF 30cs - 300cs == ? VVVLF 3cs - 30cs == ? VVVVLF 0.3cs - 3cs == ? VVVVVLF But, at 1 cycle-per-second, I suppose one could employ some sort of zero-crossing amplitude-step modulation. It would take a month or two to transmit a moderate-sized jpeg. HI!HI! Jonesy -- | Marvin L Jones | jonz | W3DHJ | OS/2 | Gunnison, Colorado | @ | Jonesy | linux __ | 7,703' -- 2,345m | config.com | DM68mn SK |
|
#13
January 30th 04, 10:06 PM
|
|||
|
|||
|
On Fri, 30 Jan 2004 08:26:45 -0800, Cambio hath writ:
Some interesting reading about Radio Waves below 22 kHz at URL: http://www.vlf.it/ Ya, but.... 3Mcs - 30Mcs == HF 300Kcs - 3Mcs == MF 30Kcs - 300Kcs == LF 3Kcs - 30Kcs == VLF 300cs - 3Kcs == ? VVLF 30cs - 300cs == ? VVVLF 3cs - 30cs == ? VVVVLF 0.3cs - 3cs == ? VVVVVLF But, at 1 cycle-per-second, I suppose one could employ some sort of zero-crossing amplitude-step modulation. It would take a month or two to transmit a moderate-sized jpeg. HI!HI! Jonesy -- | Marvin L Jones | jonz | W3DHJ | OS/2 | Gunnison, Colorado | @ | Jonesy | linux __ | 7,703' -- 2,345m | config.com | DM68mn SK |
|
#14
January 31st 04, 05:45 AM
|
|||
|
|||
|
On 30 Jan 2004 21:06:21 GMT, Allodoxaphobia hath writ:
On Fri, 30 Jan 2004 08:26:45 -0800, Cambio hath writ: Some interesting reading about Radio Waves below 22 kHz at URL: http://www.vlf.it/ Ya, but.... 3Mcs - 30Mcs == HF 300Kcs - 3Mcs == MF -snip- Yes. To follow up on my previous followup with my pure-guesswork table, here is what can be found at: http://www.vlf.it/frequency/bands.html Designation Frequency Wavelength LF low frequency 30kHz to 300kHz 10km to 1km VLF very low frequency 3kHz to 30kHz 100km to 10km ULF ultralow frequency 300Hz to 3000Hz 1,000km to 100km SLF superlow frequency 30Hz to 300Hz 10,000km to 1,000km ELF extremely low frequency 3Hz to 30Hz 100,000km to 10,000km so, I propose: RLF ridiculously low freq. 0.3Hz to 3Hz 1,000,000km to 100,000km Jonesy -- | Marvin L Jones | jonz | W3DHJ | OS/2 | Gunnison, Colorado | @ | Jonesy | linux __ | 7,703' -- 2,345m | config.com | DM68mn SK |
|
#15
January 31st 04, 05:45 AM
|
|||
|
|||
|
On 30 Jan 2004 21:06:21 GMT, Allodoxaphobia hath writ:
On Fri, 30 Jan 2004 08:26:45 -0800, Cambio hath writ: Some interesting reading about Radio Waves below 22 kHz at URL: http://www.vlf.it/ Ya, but.... 3Mcs - 30Mcs == HF 300Kcs - 3Mcs == MF -snip- Yes. To follow up on my previous followup with my pure-guesswork table, here is what can be found at: http://www.vlf.it/frequency/bands.html Designation Frequency Wavelength LF low frequency 30kHz to 300kHz 10km to 1km VLF very low frequency 3kHz to 30kHz 100km to 10km ULF ultralow frequency 300Hz to 3000Hz 1,000km to 100km SLF superlow frequency 30Hz to 300Hz 10,000km to 1,000km ELF extremely low frequency 3Hz to 30Hz 100,000km to 10,000km so, I propose: RLF ridiculously low freq. 0.3Hz to 3Hz 1,000,000km to 100,000km Jonesy -- | Marvin L Jones | jonz | W3DHJ | OS/2 | Gunnison, Colorado | @ | Jonesy | linux __ | 7,703' -- 2,345m | config.com | DM68mn SK |
|
#16
February 1st 04, 02:41 AM
|
|||
|
|||
|
"Tim Wescott" wrote in message ...
the signal bandwidth should be less than the carrier. What is the highest permissible frequency of a signal in terms of the carrier frequency? |
|
#17
February 1st 04, 02:41 AM
|
|||
|
|||
|
"Tim Wescott" wrote in message ...
the signal bandwidth should be less than the carrier. What is the highest permissible frequency of a signal in terms of the carrier frequency? |
|
#18
February 1st 04, 03:56 AM
|
|||
|
|||
|
Curious wrote:
What is the highest permissible frequency of a signal in terms of the carrier frequency? There is none. Although some people may object if you start transmitting your alpha, beta and gamma electro-magnetic waves at them. WA7AA -- Anti-spam measu look me up on qrz.com if you need to reply directly |
|
#19
February 1st 04, 03:56 AM
|
|||
|
|||
|
Curious wrote:
What is the highest permissible frequency of a signal in terms of the carrier frequency? There is none. Although some people may object if you start transmitting your alpha, beta and gamma electro-magnetic waves at them. WA7AA -- Anti-spam measu look me up on qrz.com if you need to reply directly |
|
#20
February 1st 04, 07:21 AM
|
|||
|
|||
|
Zoran Brlecic wrote in message ...
Curious wrote: What is the highest permissible frequency of a signal in terms of the carrier frequency? There is none. Although some people may object if you start transmitting your alpha, beta and gamma electro-magnetic waves at them. Sorry. I meant ask what the audio limit would be. In PCM, for example, the highest permissble frequency is half the sample rate. What is the highest permissble sound frequency in terms of its carrier wave in AM radio? |
| Reply |
| Thread Tools | Search this Thread |
| Display Modes | |
|
|
Linear Mode
