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Shortwave Strange Sounds
I like both analog & digital shortwaves radios. With analog, I often hear
more different kinds of sounds that I would not always hear on digital shortwave radios. Sometimes their are evenings when I can not pick up any broadcasting signals. So I'll just listen to the different noises in the different bands and wonder if I could identify any of them. (As a SWL, what else could I do? LOL!) One type of sound, sounds like strong winds & storms. If fact this sound may run over many frequencies through out a band. (I hear this more on digital). I wonder if these are utility stations? Another strange sound is like a bubbles exploiting. I hear this only on analog. Sometimes I hear what might sound like beacons. But I have not way to confirm it. I wish someone puts together a recording of all of these sounds & help identify them. The sound I like the most is that sequel sound that is heard on analog then turning the dial. Although I love digital radios for their features, but when you bring the squelch down, the noise is too clean. It is not nature enough for me. LOL! Hey, what is AFC, X-TAL & Superheterodne??? And did the strange sounds of tube radio were different from transistor radios? 73 |
S R wrote: (snip) Another strange sound is like a bubbles exploiting. I hear this only on analog. This is part and pracel of listening to Radio Marti, which broadcasts from this country to Cuba. The bubbling sound is Cuban jamming. Not very effective here, but we're close to the signal and far from the jamming. Wonder how it sounds there? Hey, what is AFC, X-TAL & Superheterodne??? AFC is Automatic Frequency Control. It "locks" the station freqency to prevent drift, in theory. Sometimes it's a great help. Sometimes, it's a hindrance. Most effective in FM radio. I honestly don't know what X-Tal is. Superheterodyne means "above heterodyne". Heterodyning involves using two carrier waves at different frequencies. The sound created between the two is a whistle or sine wave tone that rises or drops in frequeny as you approach the "center" of the station's signal. Have you seen old movies or cartons where someone is tuning a radio statin in, and those swooping "weeeeeohhhhwaaahh" tones until they get to the station? Those are heterodynes. Superheterodybe circuitry eliminates it by using carrier waves above audible frequencies, but they are still clearly heard in any SSB mode, and are a great aid to tuning precisely. Tony ----== Posted via Newsfeed.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeed.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= 19 East/West-Coast Specialized Servers - Total Privacy via Encryption =--- |
http://www.wunclub.com/sounds/
This is a list such as may profit you in your endeavor s. "Strength and Honor" "Tony Meloche" wrote in message ... S R wrote: (snip) Another strange sound is like a bubbles exploiting. I hear this only on analog. This is part and pracel of listening to Radio Marti, which broadcasts from this country to Cuba. The bubbling sound is Cuban jamming. Not very effective here, but we're close to the signal and far from the jamming. Wonder how it sounds there? Hey, what is AFC, X-TAL & Superheterodne??? AFC is Automatic Frequency Control. It "locks" the station freqency to prevent drift, in theory. Sometimes it's a great help. Sometimes, it's a hindrance. Most effective in FM radio. I honestly don't know what X-Tal is. Superheterodyne means "above heterodyne". Heterodyning involves using two carrier waves at different frequencies. The sound created between the two is a whistle or sine wave tone that rises or drops in frequeny as you approach the "center" of the station's signal. Have you seen old movies or cartons where someone is tuning a radio statin in, and those swooping "weeeeeohhhhwaaahh" tones until they get to the station? Those are heterodynes. Superheterodybe circuitry eliminates it by using carrier waves above audible frequencies, but they are still clearly heard in any SSB mode, and are a great aid to tuning precisely. Tony ----== Posted via Newsfeed.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeed.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= 19 East/West-Coast Specialized Servers - Total Privacy via Encryption =--- |
Hi Tony: The bubbling sound I hear, only happens on the 10 & 11 meter band.
(Analog). It is at random. Someone once refer to this bubbling as a whale fart. Now, I am not sure if we are talking about the same sound? Marti or Havana, Cuba is usually on 49 meters. 6.000 mhz (I think). Please tell me which FREQ. & UTC you hear that jamming. And jamming at which station? Thank you. Last night (Tue) at 0200 UTC I was listening to 7415 Hour of the time. The station came in very clear and after maybe 15 minutes, a lot of interference came in. I wonder? 73 "Tony Meloche" wrote in message ... S R wrote: (snip) Another strange sound is like a bubbles exploiting. I hear this only on analog. This is part and pracel of listening to Radio Marti, which broadcasts from this country to Cuba. The bubbling sound is Cuban jamming. Not very effective here, but we're close to the signal and far from the jamming. Wonder how it sounds there? Hey, what is AFC, X-TAL & Superheterodne??? AFC is Automatic Frequency Control. It "locks" the station freqency to prevent drift, in theory. Sometimes it's a great help. Sometimes, it's a hindrance. Most effective in FM radio. I honestly don't know what X-Tal is. Superheterodyne means "above heterodyne". Heterodyning involves using two carrier waves at different frequencies. The sound created between the two is a whistle or sine wave tone that rises or drops in frequeny as you approach the "center" of the station's signal. Have you seen old movies or cartons where someone is tuning a radio statin in, and those swooping "weeeeeohhhhwaaahh" tones until they get to the station? Those are heterodynes. Superheterodybe circuitry eliminates it by using carrier waves above audible frequencies, but they are still clearly heard in any SSB mode, and are a great aid to tuning precisely. Tony ----== Posted via Newsfeed.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeed.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= 19 East/West-Coast Specialized Servers - Total Privacy via Encryption =--- |
S R wrote: Hi Tony: The bubbling sound I hear, only happens on the 10 & 11 meter band. (Analog). It is at random. Someone once refer to this bubbling as a whale fart. Now, I am not sure if we are talking about the same sound? Marti or Havana, Cuba is usually on 49 meters. 6.000 mhz (I think). Please tell me which FREQ. & UTC you hear that jamming. And jamming at which station? Thank you. The sound I am describing sounds like a pot of water come to a boil, or a fish aquarium with a pump. I won't even begin (this late) to try and give you the frequencies I hear Radio Marti. Suffice to say it's from one end of the dial to the other, and easily hearable all over the USA anytime of day or night. If you run the 41, 31 and 25 meter bands at night, or the 25, 21 and 19 meter bands during the day, you will inevitably hear R. Marti. Usually in many places. The broadcasts are from Washington, but the transmitter is in Greenville, S.C Cuba has nothing to do with Radio Marti except to try and block it's signal from being readable anywhere in Cuba. That's the "bubbling". Tony ----== Posted via Newsfeed.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeed.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= 19 East/West-Coast Specialized Servers - Total Privacy via Encryption =--- |
Xtal stands for crystal. As Tony said, a superheterodyne receiver is one
where the input signal is combined in a mixer with a local oscillator signal. The local oscillator signal is separated from the input signal by a difference in frequency that is referred to as the intermediate frequency (I.F.) Either high or low side injection can be used, although most of the time, high side injection yields better response in terms of in-band spurs. This refers to whether the local oscillator (LO) runs either above or below the received frequency. The reason that this scheme is used is because high gain can be achieved without the need to have several stages tracking at the received signal frequency. This is a good deal, since most of the amplification is done at the I.F. Typical intermediate frequencies are 455kHz, 10.7MHz, 45MHz, etc. Pete "S R" wrote in message ... Hi Tony: The bubbling sound I hear, only happens on the 10 & 11 meter band. (Analog). It is at random. Someone once refer to this bubbling as a whale fart. Now, I am not sure if we are talking about the same sound? Marti or Havana, Cuba is usually on 49 meters. 6.000 mhz (I think). Please tell me which FREQ. & UTC you hear that jamming. And jamming at which station? Thank you. Last night (Tue) at 0200 UTC I was listening to 7415 Hour of the time. The station came in very clear and after maybe 15 minutes, a lot of interference came in. I wonder? 73 "Tony Meloche" wrote in message ... S R wrote: (snip) Another strange sound is like a bubbles exploiting. I hear this only on analog. This is part and pracel of listening to Radio Marti, which broadcasts from this country to Cuba. The bubbling sound is Cuban jamming. Not very effective here, but we're close to the signal and far from the jamming. Wonder how it sounds there? Hey, what is AFC, X-TAL & Superheterodne??? AFC is Automatic Frequency Control. It "locks" the station freqency to prevent drift, in theory. Sometimes it's a great help. Sometimes, it's a hindrance. Most effective in FM radio. I honestly don't know what X-Tal is. Superheterodyne means "above heterodyne". Heterodyning involves using two carrier waves at different frequencies. The sound created between the two is a whistle or sine wave tone that rises or drops in frequeny as you approach the "center" of the station's signal. Have you seen old movies or cartons where someone is tuning a radio statin in, and those swooping "weeeeeohhhhwaaahh" tones until they get to the station? Those are heterodynes. Superheterodybe circuitry eliminates it by using carrier waves above audible frequencies, but they are still clearly heard in any SSB mode, and are a great aid to tuning precisely. Tony ----== Posted via Newsfeed.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeed.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= 19 East/West-Coast Specialized Servers - Total Privacy via Encryption =--- |
"S R" wrote in message ... I wish someone puts together a recording of all of these sounds & help identify them. Try he http://www.wunclub.com/sounds/index.html -- Tom Sevart N2UHC Frontenac, KS http://www.geocities.com/n2uhc |
"S R" wrote in message ... Hi Tony: The bubbling sound I hear, only happens on the 10 & 11 meter band. (Analog). It is at random. Someone once refer to this bubbling as a whale fart. I think you're hearing Over-The-Horizon Radar (OTHR). It is a very flatulent signal that I once heard a guy on a fishing boat refer to as "gorilla farts." http://www.wunclub.com/sounds/index.html Click on the OTHR link and see if it's the same one. -- Tom Sevart N2UHC Frontenac, KS http://www.geocities.com/n2uhc |
Tom Sevart wrote:
"S R" wrote in message ... Hi Tony: The bubbling sound I hear, only happens on the 10 & 11 meter band. (Analog). It is at random. Someone once refer to this bubbling as a whale fart. I think you're hearing Over-The-Horizon Radar (OTHR). It is a very flatulent signal that I once heard a guy on a fishing boat refer to as "gorilla farts." http://www.wunclub.com/sounds/index.html Click on the OTHR link and see if it's the same one. I'm familiar with two kinds of 'bubble' signals. One is a utility mode for sending data and the other kind is used for jamming a shortwave signal. Both have a bubbling quality to their sound. If you hear a bubble signal on one of the international shortwave bands, it's likely a jammmer. -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
"Jay Heyl" wrote http://www.wunclub.com/sounds/index.html That's an interesting site. Does anyone know of a site that has examples of signals at various SIO/SINPO ratings? I usually put down some kind of rating in my logs, but I'm never sure if my idea of "barely audible" is the same as anyone else's. It would be nice to have some kind of example of various ratings from more experienced folks. ================================================ Here is some help from a perhaps dated guidebook issued by NASWA Understanding Your S-Meter DXing According to NASWA - 4th Ed. 1979 by Edward Shaw Without a doubt the S-meter is perhaps one of the most misunderstood pieces of equipment associated with our hobby. The S-meter may be used by the hobbyist to aid him/her in evaluating an incoming signal. To begin with, it may be best to explain briefly that the S-meter is a simple voltage meter which measures the output strength of the first IF transformer in a receiver. The stronger the signal, the higher the IF output voltage, resulting in greater needle deflection on the S-meter. The measurement shows strength in decibels above a given standard. The word decibel derives from Alexander Graham Bell, thus a 'Bel' was a single measure, and deci-bel meant 10 Bels. Each S-unit is nominally double the value of the preceding unit. That is to say, an S-6 reading is twice as much signal as S-5, etc. The typical S-meter is marked off in units from S-1 to S-9 with graduations after that for 10, 20, 30 or more decibels above S-9. An S-meter gives only relative strength of stations heard. A reading of S-9 on one receiver may not be S-9 on another receiver, even using the same antenna in the same location. However, this is only because manufacturers cannot or do not adhere to one standard. One prevalent standard among many professional manufacturers of communications equipment (and the U.S. military complex)is to adjust S-9 on the meter for a 60 microvolt laboratory signal. This would mean that an S-meter reading of S-8 would be 30 microvolts; S-7 would be 15 microvolts, and so on down to S-1 which would indicate something less than 1/4 microvolt. Depending on the sophistication of the receiver at hand, and its ability to give an appreciable signal-to-noise ratio, the S-meter needle actually may never register below S-3 or so due to the noise level itself keeping the needle deflected up that far. Only under the most controlled laboratory conditions can a manufacturer's claims of .... i.e. "1/4-microvolt" sensitivity be realized. In reality a 1/4 microvolt signal amplified sufficiently enough to be audible probably would be so lost amid the amplified noise level as well, that it would be undetectable. In practical use of your S-meter to aid in adjudging a fairly reasonble SINP evaluation, the following guidelines are offered. They may or may not be accepted by radio station engineers or other DXers. Only the S factor is SINPO is considered here, and one should not confuse it with evaluations for QRM or QRN (respectively I and N of the SINPO code). Graduations between S-1 and S-9 may vary in accuracy from meter to meter, and from receiver to receiver. S5 - The best possible local quality strength. The carrier wave alone of such a signal will do much to suppress QRM or QRN. The S-meter reading is in excess of 20dB over S-9. S4 - Strong signals between S6 and +20dB. Voice and music are comfortably readable. Slight QRM and/or QRN may be present. No trouble following complete program with full understanding. S3 - S-meter is S-4 to S-6 and music is readlily identifiable. Voices are clear enough to follow the gist of what is being said (or would be if you understood the language). S2 - S-meter registers between S-2 and S-4. Familiar tunes are still recognized, but with difficulty after some moments. Can still differentiate between male or female announcers. Can possibly still ID the language by tone, inflection, gleaned words, etc. S1 - S-meter is less than S-2. Cannot determine whether male or female. Cannot recognize tunes or language. Noise level is likely to be much louder than the signal itself. In the last case, an ethical listener cannot claim certainty of identification, and the only guide to suspects will be reports of others who have heard a better signal from such a station. |
In article k6%6c.49140$KO3.160008@attbi_s02, "Chief Suspect" chief
says... "Jay Heyl" wrote http://www.wunclub.com/sounds/index.html That's an interesting site. Does anyone know of a site that has examples of signals at various SIO/SINPO ratings? I usually put down some kind of rating in my logs, but I'm never sure if my idea of "barely audible" is the same as anyone else's. It would be nice to have some kind of example of various ratings from more experienced folks. ================================================ Here is some help from a perhaps dated guidebook issued by NASWA Understanding Your S-Meter DXing According to NASWA - 4th Ed. 1979 by Edward Shaw Without a doubt the S-meter is perhaps one of the most misunderstood pieces of equipment associated with our hobby. The S-meter may be used by the hobbyist to aid him/her in evaluating an incoming signal. ... snip ... Thanks, Chief. That does help. -- Jay |
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