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: [email protected]
> [mailto:[email protected]] 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
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [email protected]


--
Not sent from an iPhone.