Digital Signal Generator Model Number DSG-1A

The digital signal generator is a completely digitally generated signal device with real (not synthesized) voice channel slating capabilities plus pink noise, pink tone (31 iso frequencies all at the same time), a speaker phase (5 millisecond square wave burst) and a special 500 Hz line phase signal for testing lines that go through transformers, etc., that a square wave doesn't go through very well. Special signals can be generated such as a 35mm xmod signal or a 16mm xmod signal. Custom signals can also be generated on request at a nominal additional fee. There is also an on-board slating mic that overrides all features. All features except level controls may be remote controlled or triggered from any switch closure (or open collector output) such as a time code or midi control signal.

In addition, sequences can be programmed in. For example, 10 seconds of pink noise, 1 kHz, 10 kHz, and 50 Hz or whatever sequence is desired. The so-called nbc standard of voice slating left and right channels plus the sequence of tones (20 sec of 1 kHz, 10 sec of 50 Hz, 5 kHz, 10 kHz, 15 kHz) are available as well.

The DSG-1A comes standard with 5 fully buffered balanced outputs with 2 channel loop through (on outputs 1 and 2) which allows you to leave a 2 channel machine or audio channel patched through the unit, and it is hard wire bypassed when the power is off or the generator is not on. Up to 8 channel loop through is available at an additional charge and would be available via an elco type connector.

There is an open collector output for dim (or mute) which can be jumpered to operate when in osc mode, slate mode or both. There are also two open collector outputs which can be assigned to any of the switches. These could be used to put a machine in record or to trigger any outside device such as noise reduction signals. One use would be to assign channel 1 to an "a" type noise reduction unit and trigger it with "ext 1", plus assign channel 2 to an "sr" noise reduction unit and trigger it with "ext 2".

Specifications

1.75 inch (1 unit height) rack mounted chassis input impedance 20k ohms (remote slate input) output impedance 100 ohms headroom balanced, +28 dbm

Front panel controls

Switch 0; off: this switch turns the signal generator off. It hard wire bypasses channel one and channel two (or one thru eight if the elco option has been chosen) and kills the system clock.

Switch one; shift: When the LED is off, this switch enables the top engraved functions on switches two thru nine. When the LED is on (shift mode) the bottom engraved functions occur. Toggling between shift and normal mode puts the system in the off mode until another function is selected.

Switch two; house/vc seq: In the "normal" mode when this switch is pressed it outputs the "house" standard, which can be any available sequence. In the "shift" mode when this switch is pressed it voice slates channel one "left" and channel two "right" plus the nbc sequence of tones which is 20 seconds of 1 kHz, 10 seconds of 50 Hz, 10 seconds of 5 kHz, 10 seconds of 10 kHz, 10 seconds of 15 kHz, and then off.

Switch three; pink/ptone: In the normal mode this selects pink noise. In the shift mode this selects pink tone (31 iso frequencies).

Switch four; 1k/seq 1: In the normal mode this selects 1 kHz In the shift mode this selects custom sequence #1.

Switch five; 10k/seq 2: In the normal mode this selects 10 kHz In the shift mode this selects custom sequence #2.

Switch six; 100/seq 3: In the normal mode this selects 100 Hz In the shift mode this selects custom sequence #3.

Switch seven; vari/sweep: In the normal mode this selects the variable frequency mode. The frequencies are then selected by switches eight and nine. In the shift mode this selects the "sweep" mode (steps thru all the frequencies continually).

Switch eight; speaker phase: In the normal mode this selects speaker phase which is a 5 millisecond pulse approximately every half second. In the shift mode this controls external output #1 which is an open collector output. When in the variable frequency mode this is the (down) switch.

Switch nine; line phase: In the normal mode this selects line phase which is a combination of frequencies whose base frequency is 500 Hz This looks like a finger pointing up when in phase and down when out of phase. In the shift mode this controls external output #2 which is an open collector output. When in the variable frequency mode this is the (up) switch.

Coarse, cal, fine switch: In the coarse position the output is adjusted via the level control between 0 and approximately 27 dbm. In the calibrate position the output is a fixed +4 dbm adjusted via a trim pot marked "cal" on the main board. In the fine position the output is adjusted approximately +/- 2 db around +4 dbm via the level control.

Slate mic level: This controls the slate mic level.

Slate switch: This puts the unit into the slate mode no matter what mode the unit is in and also turns on 25 Hz as a slate tone. The slate tone level is controlled by a pot on the main board called "slate tone level."

Price: US $2475.00