Page 24 of the IC-7600 manual has the answer. This transceiver can be run in
either FSK or AFSK configuration.
Accessory 1 pin 1 is the input line for a FSK (on/off) signal
Accessory 1 pin 2 is the ground
Accessory 1 pin 4 is the modulator input at 10k Ohms (AFSK signal input to
transceiver)
Accessory 1 pin 2 is the ground
Accessory 1 pin 5 is the fixed level detector output (AF from transceiver)
The complete manual can be downloaded from the Icom website.
73 de Bob - KØRC in MN
----- Original Message -----
From: "Gary E. Jones" <garyejones@cmaaccess.com>
To: <rtty@contesting.com>
Sent: Sunday, October 11, 2009 8:39 PM
Subject: [RTTY] FW: Icom IC7600 and MMTTY
>
>
> -----Original Message-----
> From: Gary E. Jones [mailto:garyejones@cmaaccess.com]
> Sent: Sunday, October 11, 2009 8:38 PM
> To: 'Dave AA6YQ'
> Subject: RE: [RTTY] Icom IC7600 and MMTTY
>
> I do not yet own an ICOM IC-7600 transceiver but am seriously close to
> making the purchase. Therefore, I am not absolutely positive about this,
> but the manual indicates right at the start that RTTY in the 7600 is FSK,
> not AFSK. It is the understanding of a good friend of mine who owns one
> that the situation is the opposite of what is stated below... that is if
> you do want to run AFSK that you need to enable the signal out on the back
> panel and you can feed it to an external AFSK sound card interface.
>
> If someone from ICOM is on here, I would appreciate it if you would come
> on and clarify this issue for sure one way or the other. Also, I see
> nothing in the manual that while the 7600 does have a built in keyer, and
> from a keyboard, you can put information into memory buffers that then can
> be played as in a memory keyer, and the keyboard can clearly be used for
> RTTY and PSK, I can find no information on whether the keyboard can also
> be used in real time mode to "keyboard CW through the keyer (that is, live
> and not out of memory). Does anyone know for sure.
>
> Here is a copy of the manual dealing with the first part of the
> description of RTTY operation.
>
> 73 Gary W5FI
>
>
>
>
> " ■ RTTY (FSK) operation
>
> A DSP-based high-quality Baudot RTTY encoder/
>
> decoder is built-in to the IC-7600. When connecting
>
> a PC keyboard (pgs. 18, 19), RTTY operation can be
>
> performed without an external RTTY terminal, TNC or
>
> PC.
>
> If you would rather use your RTTY terminal or TNC,
>
> consult the manual that comes with the RTTY terminal
>
> or TNC.
>
> q Push a band key to select the desired band.
>
> w Push [RTTY/PSK] to select RTTY.
>
> • After RTTY mode is selected, push and hold
>
> [RTTY/PSK] for 1 sec. to toggle between RTTY and
>
> RTTY-R modes.
>
> • “RTTY” or “RTTY-R” appears.
>
> •RTTY tuning indicator appears.
>
> e Push [DECODE] (F-3) to display the decode
>
> screen.
>
> • The IC-7600 has a built-in Baudot decoder.
>
> r To tune the desired signal, aim for a symmetrical
>
> waveform and ensure the peak points align with
>
> the mark (2125 Hz) and shift (170 Hz) frequency
>
> lines in the FFT scope.
>
> • The S-meter indicates received signal strength when
>
> signal is received.
>
> t Press [F12] on the connected PC’s keyboard to
>
> transmit.
>
> • [TX] indicator lights red.
>
> y Type from the keyboard to enter the contents that
>
> you want to transmit.
>
> • The typewritten contents are indicated in the TX buffer
>
> screen and transmitted immediately.
>
> • The text color will be changed when transmitted.
>
> • Press one of [F1]–[F8] on the keyboard to transmit the
>
> TX memory contents.
>
> u Press [F12] on the keyboard to return to receive.
>
> ✔ For your convenience
>
> The transmission contents can be typed before being
>
> transmitted.
>
> q Perform the steps q to r above.
>
> w Type from the connected keyboard to enter the
>
> message that you want to transmit.
>
> • The typewritten contents are indicated in the TX buffer
>
> screen.
>
> e Press [F12] of the connected keyboard to transmit
>
> the typewritten contents.
>
> • The color of displayed text, in the TX buffer screen, will
>
> be changed when transmitted.
>
> • To cancel the transmission, press [F12] twice.
>
> r Press [F12] of the keyboard to return to receive.
>
> EXIT/SET Main dial
>
> F-3
>
> [TX]
>
> indicator
>
> [RX]
>
> indicator Band keys
>
> RTTY/PSK
>
> DECODE
>
> Appears Appears
>
> 2125/170
>
> 1905 2515
>
> FFT scope
>
> TX buffer screen
>
> TX/RX contents screen
>
> Water-fall
>
> 46
>
> RECEIVE AND TRANSMIT 4
>
>
>
> -----Original Message-----
> From: rtty-bounces@contesting.com [mailto:rtty-bounces@contesting.com] On
> Behalf Of Dave AA6YQ
> Sent: Saturday, October 10, 2009 12:07 PM
> To: Jim W7RY; rtty@contesting.com
> Subject: Re: [RTTY] Icom IC7600 and MMTTY
>
>>>>AA6YQ comments below
>
> -----Original Message-----
> From: rtty-bounces@contesting.com [mailto:rtty-bounces@contesting.com]On
> Behalf Of Jim W7RY
> Sent: Saturday, October 10, 2009 12:58 PM
> To: rtty@contesting.com
> Subject: Re: [RTTY] Icom IC7600 and MMTTY
>
>
> Cool. Thanks Dave... A few more questions....
>
> Since it emulates a sound card, it must be AFSK keying so the microphone
> gain has to be adjusted for proper level?
>
>>>>Yes its AFSK, but the transmit audio uses a separate path that is not
> governed by microphone gain. I adjusted the level using the Windows
> Multimedia Mixer.
>
>
> Is FSK available and does it work?
>
>>>>For FSK transmission, you need an external interface to convert the
>>>>level
> of the FSK data emitted by MMTTY/EXTFSK from a serial port TxD, RTS, or
> DTR
> signal to the FT-7600's RTTY input on ACC-1 pin 1.
>
>
> Did you compare the "quality" of the decode operation to a computer
> mounted
> high quality sound card? (i.e. SoundBlaster)?
>
>>>>No. I just made a QSO with a European station from the HRO store in
>>>>Salem
> NH to make sure things worked in both directions. You might ask on the
> Yahoo
> IC7600 group:
>
> <http://groups.yahoo.com/group/icom7600>
>
> 73,
>
> Dvae, AA6YQ
>
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