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#1
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CW on 11690 @ 1720?
anyone else picking up CW on 11690 @ 1720?
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#2
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CW on 11690 @ 1720?
Lisa Simpson wrote: anyone else picking up CW on 11690 @ 1720? That's RTTY. dxAce Michigan USA |
#3
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CW on 11690 @ 1720?
Thank you! What's RTTY?
"dxAce" wrote in message ... Lisa Simpson wrote: anyone else picking up CW on 11690 @ 1720? That's RTTY. dxAce Michigan USA |
#4
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CW on 11690 @ 1720?
Lisa Simpson wrote: Thank you! What's RTTY? Radio Teletype dxAce Michigan USA |
#5
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CW on 11690 @ 1720?
In article ,
dxAce wrote: Lisa Simpson wrote: Thank you! What's RTTY? Radio Teletype This is a digital transmission mode with a carrier modulated with two tones. One tone represents "0" and the other tone "1." You have to tell the decoder several things. First you need to tune it so it properly discriminates the two tones and give the decoder the right shift. Then you have to tell it which tone is the "0." Then you need to pick the data rate. You get all that correctly and if the data is not further encoded then you can read the text being sent but these days most of it is encrypted by the military so you will not be able to read it. If you use a computer sound card the software can do everything except maybe tuning the radio. Tune in a RTTY and several other modes and the software will figure the other parameters out and decode it if not encrypted. You can read some ham transmissions, ship to shore and maybe the combination ham /military network that sends personal messages from the troops if it is still around with the Internet email. You can still get weather fax sent to mariners. I used to listen to the news services over HF that used RTTY modes. It was another way to get world news before anyone else but that all went to satellite and under the ocean cable with the Internet years ago. -- Telamon Ventura, California |
#6
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CW on 11690 @ 1720?
Thanx for that descriptive explanation! Very helpful, I appreciate you
taking the time . . . "Telamon" wrote in message ... In article , dxAce wrote: Lisa Simpson wrote: Thank you! What's RTTY? Radio Teletype This is a digital transmission mode with a carrier modulated with two tones. One tone represents "0" and the other tone "1." You have to tell the decoder several things. First you need to tune it so it properly discriminates the two tones and give the decoder the right shift. Then you have to tell it which tone is the "0." Then you need to pick the data rate. You get all that correctly and if the data is not further encoded then you can read the text being sent but these days most of it is encrypted by the military so you will not be able to read it. If you use a computer sound card the software can do everything except maybe tuning the radio. Tune in a RTTY and several other modes and the software will figure the other parameters out and decode it if not encrypted. You can read some ham transmissions, ship to shore and maybe the combination ham /military network that sends personal messages from the troops if it is still around with the Internet email. You can still get weather fax sent to mariners. I used to listen to the news services over HF that used RTTY modes. It was another way to get world news before anyone else but that all went to satellite and under the ocean cable with the Internet years ago. -- Telamon Ventura, California |
#7
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CW on 11690 @ 1720?
"Lisa Simpson" wrote in
: Thanx for that descriptive explanation! Very helpful, I appreciate you taking the time . . . You might also find this link interesting. http://en.wikipedia.org/wiki/RTTY -- Panzer |
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