what does fsk mode mean
 

is it cw i guess new to radio

Could you rephrase your question so it's understandable? Perhaps use a verb,
some standard sentence syntax, and some punctuation??

Joe
W3JDR

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

Welcome aboard rraa.

" fsk " may still stand for " frequency-shift keying ", a form of frequency
modulation where one frequency is a " mark " and another is a " space ".
Combinations of marks and spaces make characters ...
--
73, Dave, N3HE
Cincinnati OH


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

frequency-shift keying (FSK): A modulating scheme in which the modulating
signal shifts the output frequency between predetermined values. Usually,
the instantaneous frequency is shifted between two discrete values termed
the "mark" and "space" frequencies.

Used to transmit digital data, i.e. two different carrier frequencies are
used to represent zero and one.
FSK was originally used to transmit teleprinter messages by radio (RTTY) but
can be used for most other types of radio and land-line digital telegraphy

Although this a form of frequency modulation (FM),
FM is usually thought of as a voice signal that modulates the carrier.

--
CL -- I doubt, therefore I might be !






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

"W3JDR" wrote in message
news:DfS0e.15545$191.10466@trnddc02...
Could you rephrase your question so it's understandable? Perhaps use a
verb, some standard sentence syntax, and some punctuation??

Joe
W3JDR

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




Looks like W3JDR may be new to radio too, to have not known what FSK meant.
No further clarification was needed.

cl

always a mother goose in a newsgroup see w3jdr good buddy.

Caveat Lector described accurately and succinctly "FSK". For more
information, do a web search on RFL Electronics, and on Quindar Tones

Best regards, Richard Harrison, KB5WZI

No, FSK is not CW. Although others have provided a technical definition of
FSK (Frequency Shift Keying), from a practical standpoint FSK is one of two
methods that hams use to transmit in RTTY mode.

Unlike CW, where characters are constructed by sending combinations of short
(dot) and long (dash) signals all on one transmit frequency, RTTY characters
are sent by shifting your transmit frequency back and forth between a higher
(mark) and lower (space) frequency. In most ham circumstances, those two
frequencies are 170 cycles apart.

Hams use two popular techniques to create those 170-hertz shifted
frequencies:

- FSK, in which the VFO of the transmitter "knows" to shift its frequency
hi/lo in response to an input signal on the rear panel. FSK mode functions
when the transceiver is in RTTY mode.

- AFSK, in which a computer, using software that controls its sound card,
generates the correct tones and those tones are fed into the microphone
input of the transceiver. AFSK mode functions when the transceiver is in SSB
mode
--
-larry
K8UT
wrote in message
...
is it cw i guess new to radio
e

FSK=Frequency Shift Keying

Larry Gauthier (K8UT) wrote:
No, FSK is not CW. Although others have provided a technical definition of
FSK (Frequency Shift Keying), from a practical standpoint FSK is one of two
methods that hams use to transmit in RTTY mode.

Unlike CW, where characters are constructed by sending combinations of short
(dot) and long (dash) signals all on one transmit frequency, RTTY characters
are sent by shifting your transmit frequency back and forth between a higher
(mark) and lower (space) frequency. In most ham circumstances, those two
frequencies are 170 cycles apart.

Hams use two popular techniques to create those 170-hertz shifted
frequencies:

- FSK, in which the VFO of the transmitter "knows" to shift its frequency
hi/lo in response to an input signal on the rear panel. FSK mode functions
when the transceiver is in RTTY mode.

- AFSK, in which a computer, using software that controls its sound card,
generates the correct tones and those tones are fed into the microphone
input of the transceiver. AFSK mode functions when the transceiver is in SSB
mode

- AFSK, in which a computer, using software that controls its sound card,
generates the correct tones and those tones are fed into the microphone
input of the transceiver. AFSK mode functions when the transceiver is in
SSB
mode
--
-larry
K8UT

Larry you were doing good to you got to AFSK. When pure sine waves are fed
into a SSB transciever audio, the output of the transmitter is the same as
FSK. This is what is suspose to hapen when using the sound card.

AFSK is generated if the transmitter is in the AM or FM mode. This is used
mainly on VHF and above on FM to use the digital modes such as rtty.

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

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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

"chuck" wrote in message
...
Well, I have a "latency" problem between typing out postings
and engaging my brain; hence the nonsense in my previous two
posts.

Here's what I now think, and I agree with Ralph. AFSK refers
to a type of modulating signal that switches between two
audio frequencies. In other words, the audio frequency is
shifted to key the transmitter. It doesn't mean (as I
suggested earlier) that audio is used to shift the carrier
frequency, although that is the result when you modulate an
SSB transmitter with AFSK tones.

When applied to an AM or FM transmitter, the notion of AFSK
modulation still makes sense. It produces something other
than FSK, of course. But with the proper detection to
recover the modulating tones, there is no reason you
couldn't use AFSK with AM or FM transmitters for RTTY. And
indeed, AFSK is used this way on FM and AM rigs (as someone
has pointed out), although not usually for RTTY.

So the semantics seems to hinge on whether FSK and AFSK
refer to the resulting RF waveform, or to the modulating
signal. The latter notion is broader, and is what I now
understand Ralph was saying.

Thanks, Ralph.

Chuck

Now you seem to be getting what I was trying to say. For example if I feed
a sound card output into my Icom 706 and have it set for AM then a receiver
has to be set up for AM to receive the AFSK I am generating at the RF output
of the rig. Same as for FM.
If I then switch to SSB. I will now be generating FSK at the output of the
transmitter. I can slso put the Icom in the rtty position and feed data
into the data port and it will generate FSK by directly varing the output
frequency. This is the same result as using the mic input to the Icom and
using ssb.

I have not looked at the rules lately but it used not to be leagl to use
AFSK below 50 mhz. That does not mean you can not use a sound card, but you
must have the rig in the SSB position so the resluting transmission will be
FSK.

About 20 years ago I was using a ST-6 into a 220 mhz FM transimtter along
with about 20 others in the local area. By switching the audio leads to the
low band rig, we could also use FSK by running the lowband rigs in the lsb
position.

73 de KU4PT