RTTY (RADIO TELETYPE) OPERATION

Most RTTY operation today is accomplished using a TNC or other computer-based system that utilizes AFSK tones. As such, the previous discussion on LSB-mode “Packet” operation will apply for Baudot operation, as well. For RTTY operation using a Terminal Unit (TU) or the “FSK” output from a TNC, please see the discussion below. See also the illustration for details regarding connection to your TU.

FSK FSK

PTT OUT IN

RTTY ② ③

① ④

RTTY JACK

RTTY Machine

Pin 1 (SHIFT) FSK OUT

Pin 2 (RX OUT)AF IN

Pin 3 (PTT) PTT

Pin 4 (GND)GND

SETTING UP FOR RTTY OPERATION

Before commencing RTTY operation, please direct your attention to the setup steps shown in the chart to the right.

 

MENU ITEM

AVAILABLE VALUES

076

rtty R PLRTY

nor (normal) / rEU (reverse)

077

rtty T PLRTY

nor (normal) / rEU (reverse)

078

rtty RTY OUT

nAin (Main) / Sub (Sub)

079

rtty OUT LEL

0 ~ 100

080

rtty SHIFT

170/200/425/850 Hz

081

rtty TONE

1275/2125 Hz

BASIC SETUP

1.Press the [RTTY] button to enter the RTTY mode. One press of the [RTTY] button will engage RTTY operation using “LSB” injection, which is generally used in the Amateur service. In this mode, both the “RTTY” and “LSB” LEDs will light up.

To switch to USB-side injection in RTTY, press the [RTTY] button once more. Both the “RTTY” and “USB” LEDs will now be illuminated. Repeatedly pressing the [RTTY] button will toggle between LSB and USB injection on RTTY.

2.When you begin typing on your TU or computer key- board, the command to transmit should automatically be sent to the transceiver, causing it to enter the trans- mit mode.

NOTE:

If you anticipate making data transmissions of longer than a few minutes, we recommend that you use the [RF PWR] knob to reduce the transmitter power to 1/2 ~ 1/3 of its normal maximum.

ADVICE:

￿There is no adjustment of the DATA input level (Pin 1 (“DATA IN”) of the RTTY jack) on the rear panel; please make any needed level adjustments at the TU side.

￿The Mark/Space Shift utilized in most Amateur RTTY operation is 170 Hz. Other shifts may be configured, however, using Menu item “080 rtty SHIFT.”

The FT-2000is set up for “high tone” operation (cen- tered on 2125 Hz) by default, but you may configure it for low tone (1275 Hz) operation using Menu item “081 rtty TONE.”

￿You may find that you are unable to decode some RTTY stations, even if they are of sufficient signal strength. If this is observed, there may be a Mark/Space polarity problem between your station and the other station. If so, try setting Menu item “076 rtty R PLRTY” to “rEU” (“Reverse”) to see if that permits copy.Aseparate Menu item permits reversal of your transmitter’s Mark/Space polarity: “077 rtty T PLRTY.”

QUICK POINT:

In the FT-2000, “RTTY” is a mode defined as being an “FSK” mode, whereby the closing and opening of a keying line (to ground) causes the Mark/Space tones to alter- nate. The RTTY mode is not an AFSK based mode in this transceiver, and the AFSK output tones from a TNC will not cause Mark/Space shifting to occur. Use the “Packet” mode for AFSK-based Baudot and other data modes.

FT-2000 OPERATING MANUAL

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