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diddle

French translation: caractère d\'inactivité

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:diddle
French translation:caractère d\'inactivité
Entered by: Antoine Dequidt

07:56 Sep 13, 2015
English to French translations [PRO]
Tech/Engineering - Telecom(munications) / Émetteur-récepteur HF
English term or phrase: diddle
Liste des fonctions d’un émetteur-récepteur HF en mode RTTY (FSK)

RTTY diddle status.
• BLANK: Transmits blank code during no code transmission.
• LTRS: Transmits letter code during no code transmission.
• OFF: Turns the diddle function OFF.
Antoine Dequidt
France
Local time: 06:34
transmission d'un caractère d'inactivité
Explanation:
"When I got back on RTTY in 1995 after having been away since the 1970s, the first thing I noticed was the widespread use of diddle. Diddle is the transmission of a do-nothing, idle character (usually LTRS) when there's no text to send. An RTTY signal without diddle is just a steady mark tone."
http://inbody.net/ad0k/rtty/rttyinfo/diddle.htm

"Diddles are transmitted in RTTY when idling. When no text characters are being sent, the RTTY modulator should send out a steady stream of diddles. This normally happens when you key your transmitter and don’t type anything from the keyboard. Or if you are typing live in a QSO and you pause. While you are paused, diddles are being sent in an attempt to keep the receiving station’s demodulator in sync. It’s a timing device that assists when receiving RTTY. It does nothing for your transmit. It’s a receive-only issue. Diddles are very important in RTTY. It is highly recommended that you always transmit diddles. "
http://www.aa5au.com/rtty/getting-started-on-rtty/page-11/

"http://aa5au.com/GettingStartedOnRtty.pdfEven though I've been active on RTTY for over 20 years, have won several RTTY ..... Diddles are a term used for RTTY being transmitted in an idle state."

"With Monitor turned on in your radio, you should hear diddles in your headphones or coming out of your radio's speaker. Diddles are a term used for RTTY being transmitted in an idle state. If you don't hear diddles or to find out what diddles are, what they do and what they sound like, check out Page 11. (Diddles & Transmit Troubleshooting)."
http://www.aa5au.com/page/2/?s=getting started rtty

"DIDDLE CHARACTERS
In between the stop bit of a preceding character and the start bit of the next character,
the RTTY signal stays at the mark frequency. When the RTTY decoder is in this “rest” state,
a mark-to-space transition tells a decoder that the start of a new character has arrived. Noise
that causes a start bit to be misidentified can cause the RTTY decoder to fall out of sync.
After losing sync, the decoder will use subsequent data bits to help it identify the location
of the next potential start bit.
Since all mark-to-space transitions are potential locations of the leading edge of a start bit, this can cause multiple characters to be incorrectly decoded until proper synchronization is again achieved. This “character slippage” can be minimized somewhat by not allowing the RTTY signal to rest for longer than its stop bit duration. An idle or diddle character (so called because of the sound of the demodulated audio from an idle RTTY signal sending the idle characters) is inserted immediately after a stop bit when the operator is not actively typing. The idle character is a non-printing character from the Baudot set and most often the LTRS character is used.
Baudot encodes a LTRS as five bits of all ones making it particularly useful when the decoder is recovering from a misidentified start bit.
An RTTY diddle is also useful when there is selective fading. Good RTTY demodula-
tors counter selective fading by measuring the amplitudes of the mark and space sig-
nals and automatically adjusting the decoding threshold when making the decision of
whether a mark or a space is being received.
If a station does not transmit diddles and has been idle for a period of time, the receiver
will have no idea if selective fading has affected the space frequency. By transmitting
a diddle, the RTTY demodulator is ensured of a measurement of the strength of the space
carrier during each character period."
Chapter 16- Digital Modes - University of California, Berkeley
http://physics111.lib.berkeley.edu/Physics111/.../Digital_Mo...

Selected response from:

FX Fraipont (X)
Belgium
Local time: 06:34
Grading comment
Merci de votre aide.
Antoine
4 KudoZ points were awarded for this answer



Summary of answers provided
5transmission d'un caractère d'inactivité
FX Fraipont (X)


  

Answers


12 hrs   confidence: Answerer confidence 5/5
transmission d'un caractère d'inactivité


Explanation:
"When I got back on RTTY in 1995 after having been away since the 1970s, the first thing I noticed was the widespread use of diddle. Diddle is the transmission of a do-nothing, idle character (usually LTRS) when there's no text to send. An RTTY signal without diddle is just a steady mark tone."
http://inbody.net/ad0k/rtty/rttyinfo/diddle.htm

"Diddles are transmitted in RTTY when idling. When no text characters are being sent, the RTTY modulator should send out a steady stream of diddles. This normally happens when you key your transmitter and don’t type anything from the keyboard. Or if you are typing live in a QSO and you pause. While you are paused, diddles are being sent in an attempt to keep the receiving station’s demodulator in sync. It’s a timing device that assists when receiving RTTY. It does nothing for your transmit. It’s a receive-only issue. Diddles are very important in RTTY. It is highly recommended that you always transmit diddles. "
http://www.aa5au.com/rtty/getting-started-on-rtty/page-11/

"http://aa5au.com/GettingStartedOnRtty.pdfEven though I've been active on RTTY for over 20 years, have won several RTTY ..... Diddles are a term used for RTTY being transmitted in an idle state."

"With Monitor turned on in your radio, you should hear diddles in your headphones or coming out of your radio's speaker. Diddles are a term used for RTTY being transmitted in an idle state. If you don't hear diddles or to find out what diddles are, what they do and what they sound like, check out Page 11. (Diddles & Transmit Troubleshooting)."
http://www.aa5au.com/page/2/?s=getting started rtty

"DIDDLE CHARACTERS
In between the stop bit of a preceding character and the start bit of the next character,
the RTTY signal stays at the mark frequency. When the RTTY decoder is in this “rest” state,
a mark-to-space transition tells a decoder that the start of a new character has arrived. Noise
that causes a start bit to be misidentified can cause the RTTY decoder to fall out of sync.
After losing sync, the decoder will use subsequent data bits to help it identify the location
of the next potential start bit.
Since all mark-to-space transitions are potential locations of the leading edge of a start bit, this can cause multiple characters to be incorrectly decoded until proper synchronization is again achieved. This “character slippage” can be minimized somewhat by not allowing the RTTY signal to rest for longer than its stop bit duration. An idle or diddle character (so called because of the sound of the demodulated audio from an idle RTTY signal sending the idle characters) is inserted immediately after a stop bit when the operator is not actively typing. The idle character is a non-printing character from the Baudot set and most often the LTRS character is used.
Baudot encodes a LTRS as five bits of all ones making it particularly useful when the decoder is recovering from a misidentified start bit.
An RTTY diddle is also useful when there is selective fading. Good RTTY demodula-
tors counter selective fading by measuring the amplitudes of the mark and space sig-
nals and automatically adjusting the decoding threshold when making the decision of
whether a mark or a space is being received.
If a station does not transmit diddles and has been idle for a period of time, the receiver
will have no idea if selective fading has affected the space frequency. By transmitting
a diddle, the RTTY demodulator is ensured of a measurement of the strength of the space
carrier during each character period."
Chapter 16- Digital Modes - University of California, Berkeley
http://physics111.lib.berkeley.edu/Physics111/.../Digital_Mo...



FX Fraipont (X)
Belgium
Local time: 06:34
Works in field
Native speaker of: Native in FrenchFrench
PRO pts in category: 447
Grading comment
Merci de votre aide.
Antoine
Notes to answerer
Asker: Merci FX

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