sgc_sg2020_manual.pdf

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1、S G - 2 0 2 0 Tr a n s c e i v e r Installation and Operations Manual “No Compromise Communications” 2 1998 SGC IncSGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA P.O.Box 3526, 98009 Fax: 425-746-6384 or 746-7173 Tel: 425- 746-6310 or 1-800-259 7331 E-mail: Web site: SGC The SSB P

2、eople SGC develops, manufactures, and sells high performance single sideband (SSB) communications equipment. Since 1971, the compa- ny has sold to the marine, military, aviation, and industrial markets world wide. Over these years, SGC has earned an outstanding reputa- tion for product reliability a

3、nd for service after sale. The company keeps pace with equipment options, engineering developments, and design requirements. Its products are the most competitive in the entire long distance communication market. SGC equipment is presently being used by the United Nations for inter-communications in

4、 developing countries throughout the world. Many competitive racing vessels, as well as fishing boats, tugs, and commercial craft are equipped with SGC equipment. In fact, an SGC radiotelephone provided the only communications available on a past Polar expedition by the National Geographic Society.

5、SGC also supplies U.S. government agencies, several foreign gov- ernmental agencies, and major petroleum companies through Asia and latin America. All SGC equipment is designed and manufactured in the USA. SGC has qualified people ready to provide technical information, assis- tance in selecting equ

6、ipment, and recommendations for any installa- tion. SGC welcomes your call to discuss your SSB requirements. SGC 2020 Staff i 1998 SGC Inc. SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA P.O.Box 3526, 98009 Fax: 425-746-6384 or 746-7173 Tel: 425- 746-6310 or 1-800-259 7331 E-mail

7、: Web site: S G - 2 0 2 0 Tr a n s c e i v e r Installation and Operations Manual “No Compromise Communications” SGC RESERVES THE RIGHT TO MODIFY SPECIFICATIONS WITHOUT NOTICE. Manual Version 2.01 Software Version 1.06 July 1999 TABLE OF CONTENTS PAGE 1 . 0F E AT U R E S1 2 . 0I N T R O D U C T I O

8、N2 3 . 0S P E C I F I C AT I O N S4 4 . 0INSPECTION UPON RECEIPT5 5 . 0MODES OF OPERAT I O N5 6 . 0I N S TA L L AT I O N8 7 . 0SG-2020 APPLICAT I O N S1 2 8 . 0FRONT PA N E L1 7 9 . 0S E C O N D A RY SWITCH FUNCTIONS2 1 1 0 . 0POWER ON OPTIONS2 3 11 . 0BARGRAPH DISPLAY2 5 1 2 . 0FRONT PANEL CONNECTO

9、 R S2 6 1 3 . 0REAR PANEL CONNECTO R S2 7 1 4 . 0CIRCUIT DESCRIPTION2 9 1 5 . 0AM BROADCAST RECEPTION3 1 1 6 . 0QUICK TOUR OF USER CONNECTO R S3 3 1 7 . 0ALIGNMENT / TEST PROCEDURES3 6 1 8 . 0EXCITER VO LTAGE MEASUREMENTS3 9 1 9 . 0PCB LAYOUT AND SCHEMAT I C S4 5 2 0 . 0C ATALOG ITEMS6 6 G L O S S A

10、 RY7 2 APPENDIX A7 6 ii SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA P.O.Box 3526, 98009 Fax: 425-746-6384 or 746-7173 Tel: 425- 746-6310 or 1-800-259 7331 E-mail: Web site: 1998 SGC Inc SG-2020 Transceiver Front 1.0 FEATURES The SG-2020 is a compact low power transceiver with

11、the features and performance you expect in a modern full size transceiver. Strong, wide dynamic range receiver Selectivity at 2.7 KHz not less than 60 dB rejection on the adjacent channel RF Speech processing All Band Operation 160 mtrs through 10 mtrs. General Coverage Receiver, 1.8 MHz through 29.

12、7 MHz Extended receive range from 400 kHz to 1600 kHz available 20 memories that are fully user accessible Split, RIT / XIT capable High performance baseband selectable digital filters Single Sideband in USB and LSB Full break-in operation in CW Built in mode B Iambic Keyer, adjustable from 5 to 60

13、WPM Very low power consumption on receive, less than 400 mA Frequency Scan Memory scan with adjustable dwell timing DC Volt meter Operational temperature range of -30 to +70 C WARM-UP TIME The SG-2020 is equipped with a thermistor resistor circuit designed to stabilize the frequency. A warm-up time

14、of 15 to 30 minutes is needed to achieve full stability. The unit is fully operational during this time, but a drift of plus or minus 200 Hz may be noticed. 1 1998 SGC Inc SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA P.O.Box 3526, 98009 Fax: 425-746-6384 or 746-7173 Tel: 425- 7

15、46-6310 or 1-800-259 7331 E-mail: Web site: 2 1998 SGC IncSGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA P.O.Box 3526, 98009 Fax: 425-746-6384 or 746-7173 Tel: 425- 746-6310 or 1-800-259 7331 E-mail: Web site: 2.0INTRODUCTION Thank you for choosing the SGC Model SG-2020 transceiv

16、er. We know that you have many options when choosing your communica- tions equipment, and we are glad that your choice was SGC - an American designed and manufactured product. SGC has been man- ufacturing HF transceivers and equipment form 1971. Our philoso- phy is to bring unique design innovations

17、 to the industry; products that give superior performance and at very affordable prices. The SG-2020 is by no means just another radio amateur product. It is a professional, commercial grade transceiver, designed for a whole panorama of HF users - amateurs, professionals and others. The SG-2020 is t

18、he first in a series of new generation SGC products based on the single I.F. frequency. SGC introduced the first HF SSB which was mass produced for the marine industry. This product included new features, such as wide- band technology, all solid state and single conversion. This concept led to the c

19、utting edge technology behind the SG-2020 transceiver with its intercept point at +18 dbm. Strong front end, single conver- sion, structured around an I.F. frequency of 60 MHz, provides for a superior and outstanding receiver with an IF rejection of 90db. Spurious frequencies typically generated by

20、conventional multiple conversion designs are virtually eliminated. With a custom high performance SGC mixer, we keep the design simple and of superior performance. We have eliminated interfering circuitry found in other transceivers. An additional design goal was to have a low stand-by current, belo

21、w 400 mA, which would allow this unique product to be used in many applications when others could not. The SG-2020 incorporates a very basic noise blanker circuit which operates without compromising receiver performance and without any additional current drain. This allows excellent receiver charac-

22、 teristics to be preserved along with long battery life. We believe these benefits will be highly appreciated by operators in the field and other portable operations. The rugged transmitter section provides exceptionally clear, clean audio, and provides excellent performance characteristics. The amp

23、lifier has the stress power capability of 40 watts. In other words, it is capable of producing 40 saturated watts in mid band and therefore, a rating of 20 watts PEP is very conservative. The SG-2020 is equal to the performance of only a very few trans- ceivers available in todays market and which c

24、ost several thousand dollars. We are very proud of this unit - its features, performance and price. You check it out and let us know what you think. 3 1998 SGC Inc SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA P.O.Box 3526, 98009 Fax: 425-746-6384 or 746-7173 Tel: 425- 746-6310

25、or 1-800-259 7331 E-mail: Web site: 4 1998 SGC Inc 3.0 SPECIFICATIONS: SG-2020 SSB HF TRANSCEIVER GENERAL General Operating modes:USB, LSB and CW Receiver Frequency range:1.8 to 30.0 MHz, general coverage (400 kHz to 1600 kHz with broadcast filter bypassed) Transmit Frequency range:1.8 to 29.7 MHz (

26、US Ham Bands only) 1.8 to 30.0 MHz (general coverage, export) Operational Temperature Range:-30 to +70 C Operational Voltage Range:9 - 18 VDC Microprocessor:MC68HC711E9 Frequency Stability:3 ppm per 10 C *(see example below) Frequency Resolution:10 Hz Frequency Display:100 Hz RX / Tx Changeover:less

27、 than 10 ms Memories:20 (factory pre-set, user definable) Reflected Power Metering:built in LCD:back light selectable Keyer:fully adjustable IAMBIC mode B, 5 to 60 WPM Memory Scan:Adjustable Dimensions:2.75H x 6W x 7L Approximate weight:4.4 lbs. Microphone:fist, dynamic Battery Volt meter:digital; f

28、ront-panel controlled RECEIVER Sensitivity:better than .5V for 10dB S/N+N Intermodulation:+18 dbm 3rd order intercept Selectable AF bandpass:100Hz to 2700Hz Audio Output:1 watt RMS AF distortion at nominal output power:less than 3% Internal Speaker:5 watts maximum, 4 ohms Noise Blanker:pulse / ignit

29、ion RF Gain:front panel controllable BFO:processor controlled Total power consumption:less than 400 mA (receive only) TRANSMITTER Output Power:nominal 1.8-25 MHz 20 watts PEP ( above 25 MHz 14 watts min.) Output Power Adjustment:front panel control 1 to 25 watts RF Speech Processing:VOGAD baseband a

30、nd rf clipping Transmit Current consumption: 4 amperes, typical at 20 watts PEP voice Transmit intermods, 20 watts:-28 dB or better Transmit Spurious:-50 dB (Ham Bands) Specifications listed represent optimal conditions and are not subject to warranty. All SGC products must be used with compatible e

31、quipment *Example: at 14.2 MHz = 14.2 x 3 = 42.6 Hz; A total frequency drift of 42.6 Hz for a temperature change of 10 C. If the ambient temperature changes from 20 to 30 C, there could be a drift of 42.6 Hz. SGC reserves the right to modify specifications without notice. SGC Inc. SGC Building, 1373

32、7 S.E. 26th St. Bellevue, WA. 98005 USA P.O.Box 3526, 98009 Fax: 425-746-6384 or 746-7173 Tel: 425- 746-6310 or 1-800-259 7331 E-mail: Web site: SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA P.O.Box 3526, 98009 Fax: 425-746-6384 or 746-7173 Tel: 425- 746-6310 or 1-800-259 7331 E

33、-mail: Web site: 5 1998 SGC Inc. 4.0 INSPECTION UPON RECEIPT Upon receipt, open the shipping carton and inspect your SG-2020 transceiver carefully for any signs of damage. After removing all packing materials, check that all exposed controls move freely, and that the enclosure has no dents or scratc

34、hes. If you notice any damage to the unit, document it completely and contact the ship- ping company immediately. Save all packing materials for possi- ble future use. 4.1 INSTALLATION ACCESSORIES Please check to see that the following items are included in your shipping carton: (1)1 - SG-2020 Trans

35、ceiver (catalog #05-01) (2)1 - microphone (catalog #52-26) (3)1 - power cable and connector (1 meter, #14 gauge) (4)1 - Front Flip Foot (catalog #05-43) (5)1 - SG-2020 Operators Manual (6)3 - QSL cards A quick-start information guide is printed on the inside of the SG- 2020 packing carton. Use this

36、handy reference as soon as you receive your SG-2020 unit. 5.0 MODES OF OPERATION (USB, LSB, CW, DATA, AM) 5.1VOICE (USB, LSB) Voice communication is accomplished using either upper or lower sideband. To display the current operating mode, press BW. The display will indicate the current mode and the

37、bandwidth filter setting. To change modes, press REV while holding the BW button down. When operating in the ham bands, LSB is normally used below 10 MHz, and USB is used above 10 MHz. The SG- 2020 will retain the operating mode and bandwidth settings until a different frequency is chosen using one

38、of the memory selections. Favorite frequencies can be stored in any of the 20 memories, including the mode and bandwidth settings. Note: Voice operation will not function if the unit is in “CW” mode. 6 1998 SGC Inc 5.1.1 COUPLER TUNE CAPABILITY An external automatic antenna coupler can be automatica

39、lly tuned in SSB by momentarily depressing the PBT push button and then pressing the push button on the microphone within 5 seconds. This will insert the CW tone to allow the coupler to tune. The SG-2020 will transmit a tone as long as the microphone push but- ton is depressed. Once you release the

40、push button on the micro- phone, the radio reverts to SSB with no tone and normal transmis- sion can resume. Note: Once PBT has been depressed and released, you must key the microphone with-in 5 seconds or the function will time out. You may also escape this function by depressing any other key, or

41、by moving the main adjustment knob. 5.2CW MODE The SG-2020 is designed for CW use with many special features. To choose the CW mode, press and hold the BW button, and momentarily press the REV button until “CW” appears on the dis- p l a y. Continue to hold the BW button while turning the main tuning

42、 control knob to adjust the bandwidth for the desired filter setting. Narrowing the bandwidth filter will allow clear reception of CW signals in crowded bands. The bandwidth can be adjusted down to a very narrow 100 Hz, however, 300 Hz should be ade- quate for clear CW reception. CW transmit can be

43、accomplished with paddle, keyer, or push button (PTT) on the microphone. The SG-2020 is set to transmit at 650 Hz upper sideband tone. Setting the dial frequency for the same receive and transmit fre- quency (Push Button XCVE) will transmit a tone frequency of 650 Hz above the carrier frequency (upp

44、er sideband). CW for optimum performance: 1. Set volume to maximum 2. Set RF gain for comfortable level 3. Reduce bandwidth to 600 Hz approximately 4. If interfering signals are present, use the past band tuning to reduce interference 5. If further rejection is required, reduce bandwidth again to as

45、 low as 100 Hz SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA P.O.Box 3526, 98009 Fax: 425-746-6384 or 746-7173 Tel: 425- 746-6310 or 1-800-259 7331 E-mail: Web site: This setup approach will allow any operator to get superb perfor- mance under all conditions or pile ups. In CW t

46、he SG-2020 supports full break in and performs extremely well. Also, in the electronic paddle mode, the break-in is support- ed, but has been modified to support the overwhelming demand to extend some hold time after the last character and space, in order to limit the fast back and forth TX-RX cycle

47、s. Both modes are supported in the break-in mode as follows: There are two front panel inputs for CW operation (1) PAD - for built in keyer (2) KEY - for straight key or external keyer Only the “KEY” input provides the capability for full break-in. If full break-in is desired with the keyer, use the

48、 external keyer attached to the “KEY” input. “KEY” input: Radio reverts to receive immediately when key is released. This allows traffic to be heard between CW ele- ments. “PAD” input: Radio remains in transmit for space duration of CW elements and only reverts to receive after a character is sent.

49、This allows for partial break-in. Note: CW operation will not function if unit is in “USB” or LSB” mode. 5.3DATA MODES The SG-2020 is also designed for various HF data transmission modes, such as RTTY, NAVTEX, weatherfax, and packet. An HF data modem is needed, such as the SG-7200. Connection to the radio is through the microphone jack on the front panel, using standard audio in, audio out, PTT, and ground. See section 19.2 for a diagram of these connections. Select either USB or LSB for data transmission and adjust the bandwidth setting as