Ralph,
Works in SSB too...
'Doc

"'Doc" wrote in message
om...
Ralph,
Works in SSB too...
'Doc

Doc, you must not have understood what I sent. When a ssb transmitter is
fed audio tones in to the mic input for digital modes such as rtty you are
not using AFSK but FSK. It is AM or FM modes that feeding into the mic
input that you generate AFSK.

YOu do not normally generate AFSK by feeding audio into the mic input of a
SSB transmitter, you generate FSK. If a single audio tone is fed into a ssb
transmitter you get a single frequency output. If it is changed in
frequency you get another single frequency output. This is FSK even though
you are using audio into the mic input.

If you feed a single tone into the mic of an AM transmitter , you get a
carrier on the frequency and two sidebands (upper and lower) of the
frequency of the tone. This is AFSK.

Frequency Shift Keying.
It was used allot when I was in the Navy (1950's) for Teletype Machines.
For all I know, it still is used.

I seem to remember "R-Y" as two letters I could type, and it would make the
Teletype Machine go from one extreme function to the opposite extreme
function, in the printer and machine and the code functions.
We used to use that as a way to check out if a machine was functioning
properly, as that would put it through all it's steps.
With age, I am wondering if I am right or wrong on it being R-Y.
Was it R-(?) ??
Best to all----
Ron

wrote in message
...
is it cw i guess new to radio



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I seem to remember "R-Y" as two letters I could type, and it would make
the
Teletype Machine go from one extreme function to the opposite extreme
function, in the printer and machine and the code functions.
We used to use that as a way to check out if a machine was functioning
properly, as that would put it through all it's steps.
With age, I am wondering if I am right or wrong on it being R-Y.
Was it R-(?) ??
Best to all----
Ron


You are correct in the RY. Those two letters are the reverse of each other
and should move the mechanical selectors from one extreme to the other . It
is possible to have the receiver set to the wrong sideband or the
demodulator reverse switch set to the wrong position and you will receive YR
instead of RY. This makes for interesting problems for the new to rtty
person. If a transmission starts off with a line or two of RYs and you are
receiving YRs, when the main body starts up you will receive jumbled
characters.

With age, I am wondering if I am right or wrong on it being R-Y.
Was it R-(?) ??
Best to all----
Ron



You are correct in the RY. Those two letters are the reverse of each other
and should move the mechanical selectors from one extreme to the other . It
is possible to have the receiver set to the wrong sideband or the
demodulator reverse switch set to the wrong position and you will receive YR
instead of RY. This makes for interesting problems for the new to rtty
person. If a transmission starts off with a line or two of RYs and you are
receiving YRs, when the main body starts up you will receive jumbled
characters.


Altho , this is with the old 5 level code. For ASCII, there is no such
test, tho the closest you can get is the " J * " characters (J, then
upper case 8) as explained by an old boss and teletype mechanic.
and to compound it, the ASCII characters can use 1, or 2 stop bits at
the end of the characters! As info, Jim NN7K

On Sun, 27 Mar 2005 00:41:47 GMT, Jim - NN7K
wrote:

use 1, or 2 stop bits at the end of the characters!

Hi Jim,

Also 1½ stop bits (unless I'm confusing this with RS-232).

When I was in San Diego for Instructor Training, one of my Radioman
buddies told me how their final was given in the form of a box of RTTY
parts that they had to assemble into a complete working machine. He
also suggested that a wandering ET (my rating) would, on occasion (and
hidden from view), donate extra parts to random boxes.

No doubt, the endowed RM striker would mutter some other meaning for
FSK.

73's
Richard Clark, KB7QHC

Richard Clark wrote:
No doubt, the endowed RM striker would mutter some other meaning for
FSK.

If I remember correctly, the Teletype ASR-3x designer
committed suicide.
--
73, Cecil http://www.qsl.net/w5dxp

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Surely this is not correct. There is no conventional way of
doing RTTY on AM or FM.

The distinction between FSK and AFSK is that the former
operates directly on the transmitter's frequency-determining
oscillator, while the latter works first through the audio
stages of an SSB rig to achieve the same on-the-air signals.

Chuck

Ralph Mowery wrote:
"'Doc" wrote in message
om...

Ralph,
Works in SSB too...
'Doc


Doc, you must not have understood what I sent. When a ssb transmitter is
fed audio tones in to the mic input for digital modes such as rtty you are
not using AFSK but FSK. It is AM or FM modes that feeding into the mic
input that you generate AFSK.

YOu do not normally generate AFSK by feeding audio into the mic input of a
SSB transmitter, you generate FSK. If a single audio tone is fed into a ssb
transmitter you get a single frequency output. If it is changed in
frequency you get another single frequency output. This is FSK even though
you are using audio into the mic input.

If you feed a single tone into the mic of an AM transmitter , you get a
carrier on the frequency and two sidebands (upper and lower) of the
frequency of the tone. This is AFSK.

Well, maybe I was half-right. It appears that years ago,
AFSK did mean exactly what Ralph described with both AM and FM.

Today, AFSK has come to mean the use of audio tones to shift
the carrier frequency.

Sorry, and thanks for the opportunity to learn something
about changing customs!

73,

Chuck

chuck wrote:
Surely this is not correct. There is no conventional way of doing RTTY
on AM or FM.

The distinction between FSK and AFSK is that the former operates
directly on the transmitter's frequency-determining oscillator, while
the latter works first through the audio stages of an SSB rig to achieve
the same on-the-air signals.

Chuck

Ralph Mowery wrote:

"'Doc" wrote in message
om...

Ralph,
Works in SSB too...
'Doc



Doc, you must not have understood what I sent. When a ssb transmitter is
fed audio tones in to the mic input for digital modes such as rtty
you are
not using AFSK but FSK. It is AM or FM modes that feeding into the mic
input that you generate AFSK.

YOu do not normally generate AFSK by feeding audio into the mic input
of a
SSB transmitter, you generate FSK. If a single audio tone is fed into
a ssb
transmitter you get a single frequency output. If it is changed in
frequency you get another single frequency output. This is FSK even
though
you are using audio into the mic input.

If you feed a single tone into the mic of an AM transmitter , you get a
carrier on the frequency and two sidebands (upper and lower) of the
frequency of the tone. This is AFSK.

Ralph Mowery wrote:
"'Doc" wrote in message
om...

Ralph,
Works in SSB too...
'Doc


Doc, you must not have understood what I sent. When a ssb transmitter is
fed audio tones in to the mic input for digital modes such as rtty you are
not using AFSK but FSK. It is AM or FM modes that feeding into the mic
input that you generate AFSK.

YOu do not normally generate AFSK by feeding audio into the mic input of a
SSB transmitter, you generate FSK. If a single audio tone is fed into a ssb
transmitter you get a single frequency output. If it is changed in
frequency you get another single frequency output. This is FSK even though
you are using audio into the mic input.

If you feed a single tone into the mic of an AM transmitter , you get a
carrier on the frequency and two sidebands (upper and lower) of the
frequency of the tone. This is AFSK.





Apparently someone doesn't understand how AM works, or FM, or SSB for
that matter..

-C