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1、 PowerTalk Manual SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: 206-746-6384 Tel: 206- 746-6310 1-800-259-7331 1994 SGC, Inc. June 28, 2004; 15:46 SG-2000 PowerTalk TM Head w/ADSP TM 15:46 Table of Contents Section Page 1.0 General Description .1 2.0 Noise Red
2、uction .2 2.1 Adaptive Digital Signal Processing .2 2.2 Spectral Noise Subtraction (SNS) .2 2.3 ADSP .3 2.4 Notch Filter .3 2.5 High, Low and Center Frequency Filters .4 3.0 Front Panel Layout .5 4.0 ADSP Control Panel Layout .6 4.1 Notch Filter (NOTCH) .6 4.2 Bandpass Filter .7 4.2.1 Low Frequency
3、Corner .7 4.2.2 High Frequency Corner .8 4.2.3 Center Frequency .9 4.3 Noise Reduction (NOISE) .10 4.4 Spectral Noise Subtraction (SNS) .11 4.5 Preset Memory (PRESET) .12 4.6 User Memory .13 4.7 Bypass (BYPASS) .14 4.8 Digital Rotary Control (ADJ) .15 4.9 LED Display .15 4.9.1 Off Condition .15 4.9.
4、2 On Condition .15 4.10 Mnemonics .16 4.10.1 Memory Selection .16 4.10.2 Preset Memory Function .17 4.10.3 Operating Functions .17 4.11 Toggling Between Bandpass and User .17 4.12 Conclusion .18 5.0 Key Pad Changes .19 5.1 Keys Deleted .19 5.2 Keys Modified .20 5.3. Keys Added.20 5.4 Modes of Operat
5、ion .21 5.5 Operational Changes with Tuning Knob.22 6.0 Operating the PowerTalk .24 6.1 Key Functions.24 6.2 Sample Entries.28 7.0 Display LCD .30 PowerTalk Manual ii SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: 206-746-6384 Tel: 206- 746-6310 1-800-259-7331
6、1994 SGC, Inc. June 28, 2004; 15:46 8.0 Front Panel Controls.33 8.1 Primary Keyboard Functions .33 8.2 SHIFT Functions .40 8.3 Program Functions.41 8.4 Operating Session .42 8.6 Scanning Functions .48 8.7 Changing Frequency.52 8.8 Additional Functions.54 9.0 Schematics.60 10.0 Index .66 PowerTalk Ma
7、nual iii SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: 206-746-6384 Tel: 206- 746-6310 1-800-259-7331 1994 SGC, Inc. June 28, 2004; 15:46 Disclaimer The ADJ knob has a mechanical detent. You can feel the detents when the ADJ knob is rotated. The ADSP portion o
8、f the PowerTalk head can hang up if the ADJ knob stops between detents. Rotating the ADJ knob and stopping on the detent will allow the head to adjust properly. PowerTalk Manual 1 SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: 206-746-6384 Tel: 206- 746-6310 1-
9、800-259-7331 1994 SGC, Inc. June 28, 2004; 15:46 1.0 General Description Since the PowerTalk head is only one of the several optional heads for the SG-2000 HF SSB radio, this manual is designed as a companion to the manual for the SG-2000. There is much vital information on such things as antenna an
10、d grounding setups, licenses needed, computer control of the radio, software and hardware accessories and troubleshooting in the SG-2000 manual that is beyond the scope of this manual. This manual will tell you how to operate the PowerTalk Head. If you have just bought the SG-2000 radio with the Pow
11、erTalk head, please read the SG-2000 manual to make sure you have properly set up the radio before you start reading this manual. If you have bought this head separately to install on an existing SG-2000 setup and are happy with the performance of the system, this manual will tell you how to get the
12、 most from the PowerTalk head. If you think the performance of your radio could be better, you might want to look at the SG-2000 manual again and follow some of its suggestions for optimal performance. PowerTalk Manual 2 SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 US
13、A Fax: 206-746-6384 Tel: 206- 746-6310 1-800-259-7331 1994 SGC, Inc. June 28, 2004; 15:46 2.0 Noise Reduction The PowerTalk head incorporates several technologically advanced processes to filter out unwanted received noise, resulting in dramatically enhanced signal clarity. Adaptive Digital Signal P
14、rocessing (ADSP), Spectral Noise Subtraction (SNS) and the Notch filter (tone suppressor) are three methods used by the PowerTalk head to filter out signal noise. In addition, the user can adjust the quality of the audio signal by setting the Low, High and Center frequency. These processes can be us
15、ed separately or in combination by the user to configure the audio to get the best possible reception. 2.1 Adaptive Digital Signal Processing (ADSP) The benefit of ADSP TM is illustrated in the following graph: 2.2 Spectral Noise Subtraction (SNS) The benefit of SNS is illustrated by the following g
16、raph: PowerTalk Manual 3 SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: 206-746-6384 Tel: 206- 746-6310 1-800-259-7331 1994 SGC, Inc. June 28, 2004; 15:46 2.3 ADSP and SNS The benefit of ADSP and SNS working in tandem is even more dramatic as illustrated in the
17、 following graph: 2.4 Notch Filter If the PowerTalk head detects the presence of any constant tones, enabling the Notch filter will suppress this tone by 40 dB. The Notch filter will automatically suppress up to 5 tones at once. PowerTalk Manual 4 SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3
18、526, Bellevue, WA. 98009 USA Fax: 206-746-6384 Tel: 206- 746-6310 1-800-259-7331 1994 SGC, Inc. June 28, 2004; 15:46 2.5 High, Low and Center Frequency Filters In addition to the above noise reduction features, which are mainly on or off, the PowerTalk head lets the user adjust the audio quality to
19、their own liking by means of the High, Low and Center Frequency filters as illustrated below: PowerTalk Manual 5 SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: 206-746-6384 Tel: 206- 746-6310 1-800-259-7331 1994 SGC, Inc. June 28, 2004; 15:46 3.0 Front Panel La
20、yout The front panel of the PowerTalk head is shown in Figure 1 below. While the basic display and many of the button functions are similar to the Standard SG-2000 head, there are enough differences and new capabilities to warrant giving the PowerTalk its own manual. Figure 1 The main visible differ
21、ences in the new PowerTalk head are the ADSP control section in the upper left corner, the tuning knob in the lower left corner that replace the up and down arrows of the standard head, and associated buttons. The following sections of this manual, detailing the operations of the PowerTalk head, wil
22、l refer to this drawing. PowerTalk Manual 6 SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: 206-746-6384 Tel: 206- 746-6310 1-800-259-7331 1994 SGC, Inc. June 28, 2004; 15:46 4.0 ADSP Control Panel Layout Lets start with the section that gives the PowerTalk its
23、reason for being: the ADSP TM (Adaptive Digital Signal Processing) control panel in the upper left corner of the PowerTalk face. The overall panel layout is shown below in Figure Two: Figure Two Disclaimer: The ADJ knob has a mechanical detent. You can feel the detents when the ADJ knob is rotated.
24、The ADSP portion of the PowerTalk head can hang up if the ADJ knob stops between detents. Rotating the ADJ knob and stopping on the detent will allow the head to adjust properly Now lets go over the operation and control of the ADSP control panel step by step. 4.1 Notch Filter (NOTCH) The PowerTalk
25、head has the ablility to sense and suppress up to five (5) tones simultaneously. When the NOTCH push-button is selected, the green LED next to it will illuminate. Tones will be rejected in the 0-4,000 Hz. frequency band. (See Figure Three). PowerTalk Manual 7 SGC Inc. SGC Building, 13737 S.E. 26th S
26、t. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: 206-746-6384 Tel: 206- 746-6310 1-800-259-7331 1994 SGC, Inc. June 28, 2004; 15:46 Figure Three The noise reduction benefit of the Notch Filter is shown in the graph below, reproduced from Section 2.4: 4.2 Bandpass Filter Band Pass functionality is achie
27、ved by separately adjusting the lower and higher bandpass corner frequencies in 100 Hz increments and moving the filters center frequency across the available bandwidth. Displayed frequencies are between 200 and 3100 Hz. The lower frequency limit, however, can be as small as 100 Hz. Adjustments are
28、made through the digital rotary controllabeled ADJon the ADSP TM panel. 4.2.1 Low Frequency Corner (LF) The low corner frequency is selected by the LF push-button. The default setting is 200 Hz. with the first red LED and the last 29 green LEDs illuminated. Positioning of the lower corner frequency
29、is set by the rotary control. (See Figure Four). PowerTalk Manual 8 SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: 206-746-6384 Tel: 206- 746-6310 1-800-259-7331 1994 SGC, Inc. June 28, 2004; 15:46 Figure Four A graphic representation of setting the Low Corner
30、Frequency is shown below, reproduced from Section 2.5: 4.2.2 High Frequency Corner (HF) This filter is selected by the HF push-button. Default setting for this filter is 3100 Hz. with the first 29 green LEDs and the last, or 30th, red LED illuminated. Positioning of the Higher Corner Frequency is co
31、ntrolled by the digital rotary control. (See Figure Five). PowerTalk Manual 9 SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: 206-746-6384 Tel: 206- 746-6310 1-800-259-7331 1994 SGC, Inc. June 28, 2004; 15:46 Figure Five A graphic representation of setting the H
32、igh Corner Frequency is shown below, reproduced from section 2.5: 4.2.3 Center Frequency (CF) Once the operator has chosen the Bandpass Filters range by means of the Upper and Lower Corner Frequencies, the Center Frequency can be selected by pressing the CF push-button. When selected, all green LEDs within the passband range will be illuminated. In addition, within five seconds of pressing the CF push-button, the operator may begin adjusting the Center Frequency up or down via the digital rotary control. (See Figure Six). Figure Six PowerTalk Manual 10 SGC Inc. SGC Building, 13737 S.E. 2
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