[GreenKeys] RTTY - High tones - Low tones?

[Jeffrey Golas]

USB...terminal...when you...I mean..the list is called.... 

Jeff kc3gjx

> On Aug 25, 2023, at 9:56 PM, Harold Hallikainen via GreenKeys <greenkeys at mailman.qth.net> wrote:
> 
> It's working pretty well! I sent a bare board to Bill KE3BK, and he
> assembled it and now has that on the air. I'm continuing on code and have
> notes for the next board revision. Today I pretty much finished up the
> command interpreter that allows a user to modify a bunch of settings with
> a USB terminal.
> 
> Notes at https://w6iwi.org/rtty/DspTU2/ .
> 
> Harold
> https://w6iwi.org
> 
> 
>> On Fri, August 25, 2023 4:01 pm, Gerry Block wrote:
>> harold
>> how is it coming?
>> 
>> gerry AD6MC
>> 
>> Sent from my iPhone
>> 
>> On Aug 25, 2023, at 1:29 PM, Ralph Mowery  wrote:
>> 
>> 
>> @font-face { font-family: "Cambria Math"; } @font-face { font-family:
>> Calibri; } @font-face { font-family: Tahoma; } p.MsoNormal, li.MsoNormal,
>> div.MsoNormal { margin: 0in 0in 0.0001pt; font-size: 12pt; font-family:
>> "Times New Roman", serif; } a:link, span.MsoHyperlink { color: blue;
>> text-decoration: underline; } a:visited, span.MsoHyperlinkFollowed {
>> color: purple; text-decoration: underline; } span.EmailStyle17 {
>> font-family: Calibri, sans-serif; color: rgb(31, 73, 125); }
>> .MsoChpDefault { } @page WordSection1 { size: 8.5in 11in; margin: 1in; }
>> div.WordSection1 { page: WordSection1; }For HF the tones do not matter.
>> Just that they are  either 850 Hz apart for the old standard or 170 Hz
>> apart for the new standard.  Hams shifted low on HF, so when SSB became
>> common LSB was used to invert the tones.  On VHF either AM or FM was used.
>> The tones had to be set to a ‘standard’ of 2125/2995  or 2125/2295.
>> The receiver frequency could not be shifted to compensate for the tones.
>> 
>> When SSB was used by feeding the tones into the microphone the
>> transmitters would not pass the higher tones equally.  So lower tone pars
>> were used. The  tones should be above 1000 Hz so if there was any 2nd
>> harmonics of the tones the ssb filter would help eliminate that.
>> 
>> Commercial RTTY often used 450 Hz shift and the tones were reversed from
>> what the hams used.
>> 
>> One other note is that for hams on HF to start with there were no two
>> tones but off and on keying similar to CW as per the FCC rules.
>> 
>> 
>> Ralph ku4pt
>> 
>> 
>> 
>> From: greenkeys-bounces at mailman.qth.net
>> [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Nick England
>> Sent: Friday, August 25, 2023 3:26 PM
>> To: Greenkeys
>> Subject: [GreenKeys] RTTY - High tones - Low tones?
>> 
>> 
>> 
>> 
>> I'm attempting to get a Robot 800 TU going. The manual (circa 1981) says
>> Low Tones (1275/1445) are used for HF and High Tones (2125/2295) are used
>> for VHF. "Return to factory" if you want to change....
>> 
>> 
>> 
>> 
>> 
>> Now I'm a newbie when it comes to RTTY, but I really would like to know if
>> there was ever a time when people agreed to one standard and stuck with it
>> for more than 6 months?
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> Nick England K4NYW
>> www.navy-radio.com
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
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>>>>> Jordan Spencer Cunningham's GreenKeys Search Tool:
>>>>> https://teletype.net/gksearch
>>>>> 2002-to-present greenkeys archive:
>>>>> http://mailman.qth.net/pipermail/greenkeys/
>>>>> 1998-to-2001 greenkeys archive:
>>>>> http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
>>>>> http://comcents.com/tty/greenkeyssearch.html
>> 
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> 
> 
> -- 
> Not sent from an iPhone.
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>>>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
>>>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
>>>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html
> 
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