1-2
The ST-6000 input and output circuits have been designed to allow a maximum of user flexibili-
ty. Many signal and control lines have been brought-out to rear panel connections. Both pre- and
post-autostart data signals are available on the rear panel as are the inputs and outputs of two
separate high-level loop switches. The internal 175 Volt, 50 mA loop supply is also connected to
the rear panel. Thus, the demodulator output can be used to directly key the loop or be first
passed through additional signal processing (such as the popular UART and digital control devi-
ces), and then routed back through the ST-6000 keyer stages, with the option of using or not us-
ing the internal loop supply of the ST-6000. In addition, the ST-6000 has both output and input
signal connections that are compatible with both the EIA - RS-232C and MIL-STD-188C data signal
levels.
The ST-6000 also includes a Keyboard Operated Switch (KOS) circuit that can be used to auto-
matically switch the transmit receive control circuitry of the station. The KOS circuit senses tele-
printer keyboard and CW identification signal status. If either the keyboard or the CW-ID key is
used, the KOS switching transistor turns "ON" (low impedance to ground). The KOS circuit also
places the ST-6000 demodulator circuits in a "standby" status to prevent feedback from the receiv-
er while transmitting. The NPN KOS switching transistor can be used to control a DC relay that is
supplied from a positive voltage source or a push-to-talk (PTT) control line in a transmitter (provid-
ing the PTT line is derived from a positive DC source.) Since the KOS sensing line is connected to
the rear panel, it can also be triggered by external devices.
The audio input to the demodulator and the audio output from the tone keyer are both 500
Ohms balanced (or unbalanced if jumpered) with respect to ground and use audio transformers to
maintain DC isolation. The oscilloscope signals for a crossed-ellipse oscilloscope display are con-
nected to a rear panel connection. The ST-6000 is furnished with a front panel tuning oscilloscope.
Internal, electronically regulated ±12 Volt power supplies provide operating voltages for the de-
modulator, control and tone keyer sections of the ST-6000. A 175 Volt, 50 mA loop power supply is
also included as a part of that option. The main power transformer of the ST-6000 can be connect-
ed for operation with either 105 to 125 VAC or 210 to 250 VAC, 50 or 60 Hz power sources. Both
the power line and the loop power supply are fused with fuses accessible from the rear panel of
the unit. The ST-6000 requires approximately 20 watts of AC power and is housed in an attractive
brown and tan cabinet that matches the DS-3100 ASR and other HAL Communications Video Dis-
play Terminals. The cabinet can be supplied for either table or relay-rack mounting.
A complete set of cables and connectors are furnished with the ST-6000 to simplify the initial in-
stallation of the ST-6000. If you are anxious to try your ST-6000, it is suggested that you skip to
sections 3.1 and 3.2 of the installation chapter and then read sections 4.1 and 4.2 of the operation
chapter before turning the equipment on. The balance of this manual should then be studied be-
fore attempting any "custom" connections.
Summary of Contents for ST-6000
Page 1: ...ST 6000 FSK DEMODULATOR...
Page 14: ...3 3...
Page 15: ...3 4...
Page 17: ...3 6 Figure 3 DS 2000 and ST 6000 System Connection Schematic...
Page 19: ...3 8 Figure 3 2 Loop Connections to the ST 6000...
Page 20: ...3 9 Figure 3 3 RS 232 I O Connections to the ST 6000...
Page 24: ...3 13 Figure 3 5 Alternate Loop Connections...
Page 25: ...3 14 Figure 3 6 Connections for the ST 6000 for Full Duplex Operation...
Page 49: ...5 11...
Page 50: ...5 12...
Page 51: ...5 13...
Page 52: ...5 14...
Page 53: ...5 15...
Page 54: ...5 16...
Page 55: ...5 17...
Page 56: ...5 18...
Page 57: ...5 19...
Page 58: ...5 20...
Page 59: ...5 21...
Page 60: ...5 22...
Page 61: ...5 23...
Page 62: ...5 24...
Page 63: ...5 25...
Page 64: ...5 26...
Page 65: ...5 27...
Page 66: ...5 28...
Page 69: ...6 3...
Page 70: ...6 4...