SGC SG-2000 Operating Manual

PowerTalk™ Manual

SG-2000

PowerTalkTM Head w/ADSPTM &

SNSTM

(Catalog Number 04-22)

For the SG-2000 HF SSB

Installation and Operations Manual

Revised: Sept. 6, 1995

SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: [phone] • Tel: [phone] • 1-800-259-7331

© 1994 SGC, Inc.

June 28, 2004; 15:46

	PowerTalk™ Manual	i
	Table of Contents
Section		Page
1.0	General Description ...............................................................................................	1
2.0	Noise Reduction ...................................................................................................	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 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
4.9.2	"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 Operation ..............................................................................................	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
SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA
	Fax: [phone] • Tel: [phone] • 1-800-259-7331
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	PowerTalk™ Manual	ii
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

SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: [phone] • Tel: [phone] • 1-800-259-7331

© 1994 SGC, Inc.

June 28, 2004; 15:46

PowerTalk™ Manual iii

Disclaimer

The "ADJ" knob has a mechanical detent. You can feel the detents when the ADJ knob is rotated. 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.

SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: [phone] • Tel: [phone] • 1-800-259-7331

© 1994 SGC, Inc.

June 28, 2004; 15:46

PowerTalk™ Manual 1

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 and 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 PowerTalk™ 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 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.

SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: [phone] • Tel: [phone] • 1-800-259-7331

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PowerTalk™ Manual 2

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 Processing (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 used separately or in combination by the user to configure the audio to get the best possible reception.

2.1Adaptive Digital Signal Processing (ADSP™)

The benefit of ADSPTM is illustrated in the following graph:

2.2Spectral Noise Subtraction (SNS™)

The benefit of SNS™ is illustrated by the following graph:

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PowerTalk™ Manual 3

2.3ADSP™ and SNS™

The benefit of ADSP™ and SNS™ working in tandem is even more dramatic as

illustrated in the following graph:

2.4Notch 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.

SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: [phone] • Tel: [phone] • 1-800-259-7331

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PowerTalk™ Manual 4

2.5High, 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 their own liking by

means of the High, Low and Center Frequency filters as illustrated below:

SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: [phone] • Tel: [phone] • 1-800-259-7331

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PowerTalk™ Manual 5

3.0 Front Panel Layout

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 differences 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, will refer to this drawing.

SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: [phone] • Tel: [phone] • 1-800-259-7331

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PowerTalk™ Manual 6

4.0 ADSP™ Control Panel Layout

Let's start with the section that gives the PowerTalk™ its reason for being: the ADSPTM

(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. 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.

4.1Notch Filter (NOTCH)

The PowerTalk™ 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).

SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: [phone] • Tel: [phone] • 1-800-259-7331

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PowerTalk™ Manual 7

Figure Three

The noise reduction benefit of the Notch Filter is shown in the graph below, reproduced from Section 2.4:

4.2Bandpass Filter

Band Pass functionality is achieved by separately adjusting the lower and higher bandpass corner frequencies in 100 Hz increments and moving the filter's 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 made through the digital rotary control—labeled "ADJ"—on the ADSPTM panel.

4.2.1Low 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 is set by the rotary control. (See Figure Four).

SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: [phone] • Tel: [phone] • 1-800-259-7331

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PowerTalk™ Manual 8

Figure Four

A graphic representation of setting the Low Corner Frequency is shown below, reproduced from Section 2.5:

4.2.2High 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 controlled by the digital rotary control. (See Figure Five).

SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: [phone] • Tel: [phone] • 1-800-259-7331

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PowerTalk™ Manual 9

Figure Five

A graphic representation of setting the High Corner Frequency is shown below, reproduced from section 2.5:

4.2.3Center Frequency (CF)

Once the operator has chosen the Bandpass Filter's 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

SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: [phone] • Tel: [phone] • 1-800-259-7331

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PowerTalk™ Manual 10

A graphic representation of the Center Frequency Filter is shown below,

reproduced from section 2.5:

4.3Noise Reduction (NOISE)

Noise reduction (shown below in the ADSP™ graph) is obtained via a digital

process which is initiated by pressing the NOISE push-button. When selected,

the green LED next to the NOISE push-button illuminates. (See Figure Seven).

Figure Seven

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PowerTalk™ Manual 11

The noise reduction benefit of the Noise button is illustrated in the graph below,

reproduced from section 2.1:

4.4Spectral Noise Subtraction (SNSTM)

Spectral Noise Subtraction is the special process of subtracting noise and that

portion of the spectrum where voice modulation is not used. It is selected by pushing the SNSTM push-button. When selected, the LED next to the SNSTM

push-button illuminates. (See Figure Eight).

Figure Eight

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PowerTalk™ Manual 12

The benefit of Spectral Noise Subtraction is illustrated in the graph below, reproduced from Section 2.2:

4.5Preset Memory (PRESET)

Eight options are preset into the unit's memory. These are:

	VOICE BANDWIDTH	NOTCH	NOISE	SNSTM
VW	Wide (300 to 3100 Hz.)	Yes	Yes	Yes
VM	Medium (300 to 2000 Hz.)	Yes	Yes	No
VN	Narrow (300 to 1700 Hz.)	Yes	Yes	No
CW	Filter on 1000 Hz. ± 200 Hz.	No	Yes	No
	DATA BANDWIDTH
AMTOR	Filter on 2175 Hz. ± 150 Hz.
SITOR	Filter on 1700 Hz. ± 150 Hz.
PACTOR	Filter on 2175 Hz. ± 200 Hz.
ALE	Filter on 1725 Hz. ± 1125 Hz.

Two digital filters are used in the eight PRESET functions. For voice and CW functions, a filter with a shape factor of 1:1 (130 ms delay) is used. The low , center and high frequency points of this filter can be adjusted to reduce adjacent channel interference.

For data modes, the 130 ms delay of the voice/CW filter prevents a proper handshake in ARQ modes and other data protocols due to increased switching time between transmit and receive. Therefore, in the case of AMTOR, SITOR, PACKET, PACTOR, G-TOR , and ALE, a second, very short, delay filter

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PowerTalk™ Manual 13

(approximately 2 ms) is selected. This filter's shape factor is 1.15:1, and its extremely steep skirts reject interference from adjacent frequencies.

Of necessity, the low, center and high frequency settings of data filter memories are fixed. However, by transferring data memory parameters in PRESET mode to USER mode, the short delay filter can be accessed and used in conjunction with new parameters defined by the user and stored in a USER memory.

For information on transferring data memory parameters, see Section 4.6.

Selecting the PRESET function activates the last-used preset memory and causes the two red LEDs above the selected function to become illuminated. The digital rotary control can then be used to change to any of the eight preset locations. (See Figure Nine).

Figure Nine

4.6User Memory (USER)

Seven locations are provided for user-programmed memories. Pressing the USER push-button activates the last-used User Memory selection and displays it by illuminating the two LEDs above that position. If no memory has been programmed into a particular User Memory location, the two LEDs above it will be blinking. If a User Memory location has already been programmed, the LEDs are on continuously. Use the rotary control to move between USER locations.

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PowerTalk™ Manual 14

To program a user-defined memory, configure the ADSPTM section as desired (frequency, mode, etc.) and choose an empty memory location. Then press and hold the USER switch for six seconds. The LED pair above the location chosen changes from blinking (empty) to being on steadily (programmed). To clear a user-defined memory, depress the USER push-button and select the memory location in question with the digital rotary control. Then press and hold the USER button for six seconds. When the associated LED pair changes from being on continuously to blinking, release the USER switch. The memory and its old program have now been successfully cleared.

Figure Ten

By the same process, a Preset Memory location can be selected, modified and then entered into a User Memory location.

4.7Bypass (BYPASS)

The BYPASS push-button is a toggle that determines whether or not the ADSPTM system is active. When BYPASS is pressed, its associated LED is illuminated and all functions of the ADSP™ are disabled, or bypassed. If BYPASS is pushed again or any ADSPTM function is selected (PRESET, USER, NOTCH, NOISE, SNSTM, LF, CF or HF), ADSP™ becomes active again and the green LED associated with the BYPASS button goes off, confirming that the ADSPTM system is engaged and operating. Pushing the BYPASS button to re-engage the ADSP™

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PowerTalk™ Manual 15

system will return the unit to the previous ADSP™ function while pushing any other button will engage that particular function (See Figure Eleven).

Figure Eleven

4.8Digital Rotary Control (ADJ)

The digital rotary control affects ADSPTM functions as follows:

Preset Memory (PRESET)	Set Location
User Memory (USER)		Set Location
Spectral Noise Subtraction (SNSTM)		Set Level
Low Frequency Corner Filter (LF)		Set Frequency
High Frequency Corner Filter (HF)		Set Frequency
Center Frequency Filter (CF)		Adjusts Frequency Center

4.9LED Display

4.9.1"Off" Condition

When the unit is in bypass mode, all LED indicators, except BYPASS, including dedicated LEDs, i.e., NOTCH, NOISE and SNSTM are off.

4.9.2"On" Condition

Appropriate dedicated LEDs are on. NOTCH, NOISE , SNSTM and

BYPASS have dedicated LEDs.

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PowerTalk™ Manual 16

When selected, the PRESET Memory or USER Memory functions will cause the LED pair associated with the last-used memory location to illuminate and blink if empty or stay on continuously if already programmed.

If NOISE is selected, the adjacent LED is illuminated.

If SNSTM is selected, the adjacent LED is illuminated and the row of red LEDs - labeled "SNSTM LEVEL" on Figure One - is used as a spectral noise subtraction, peak-reading meter.

If LF, CF, or HF buttons are depressed, the lower corner frequency, the upper corner frequency and/or the bandwidth frequencies outside the passband are indicated by red LEDs. The selected corner or center frequency can be set by the ADJ (for ADJUST) knob. When bandpass is activated, both green and red LED displays change to VU-type metering within five seconds. When either the PRESET or USER memory function buttons are depressed, the LED memory pair of the specific memory selected will be displayed. If NOISE , SNSTM , NOTCH, LF, CF or HF is selected, the display will change to VU metering.

4.10 Mnemonics

4.10.1 Memory Selection
Preset Memory	PRESET	Section 4.5
User Memory	USER	Section 4.6

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PowerTalk™ Manual 17

4.10.2 Preset Memory Function
Voice Wide	VW	Section 4.5
Voice Medium	VM	Section 4.5
Voice Narrow	VN	Section 4.5
Morse, 1000 Hz.	CW	Section 4.5
AMTOR	AMT	Section 4.5
SITOR	SIT	Section 4.5
PACTOR/PACKET PAC		Section 4.5
Automatic Link
Establishment	ALE	Section 4.5
4.10.3 Operating Functions
Notch Filter	NOTCH	Section 4.1
Noise Reduction	NOISE	Section 4.3
Spectral Noise
Subtraction	SNSTM	Section 4.4
ADSPTM Bypass	BYPASS	Section 4.7
Low Frequency
Corner	LF	Section 4.2.1
High Frequency
Corner	HF	Section 4.2.2
Center Frequency	CF	Section 4.2.3

4.11 Toggling Between Bandpass and User or Preset

This unit includes the ability of allowing the user to toggle between the currently selected bandpass and any Preset or User Programmed conditions. This provides the user the ability to listen and compare before selecting one set of parameters over another.

Select a Bandpass Filter width as described in Section 4.2. To toggle to a PRESET or USER defined filter, push the PRESET or USER button and turn the rotary knob to find the desired setting, i.e. VN, ALE, 1, 2, etc. To toggle back to the originally selected Bandpass mode, push LF, CF or HF. Pushing the PRESET or

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PowerTalk™ Manual 18

USER button again will toggle back to the previous PRESET or USER setting. This toggling can continue indefinitely, allowing the user to listen to and compare the two sets of conditions.

If the user wants the Bandpass changed to the parameters of the PRESET or USER setting, pushing the PRESET or USER button twice in succession will update the Bandpass settings to those of the PRESET or USER.

4.12 Conclusion

The foregoing technical/operational description has been generated by SGC to provide a highly intuitive and friendly interface between an operator and the ADSPTM/SNSTM operating modes unique to this unit. This design is exclusive and proprietary to SGC and must not be emulated, simulated or copied by other parties for any purpose. This manual was produced solely to provide the operator an understanding of the outstanding capabilities of the PowerTalk™ head.

SGC Inc. SGC Building, 13737 S.E. 26th St. P.O.Box 3526, Bellevue, WA. 98009 USA Fax: [phone] • Tel: [phone] • 1-800-259-7331

© 1994 SGC, Inc.

June 28, 2004; 15:46