TS-820_user.pdf

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1、OPERATING MANUAL CONTENTS TS-820 SPECIFICATIONS . . SECTION 1 FEATURES SECTION 2 INSTALLATION . 2.1 Unpacking 2.2 Operation Location 2.3 Power Connections 2.4 Antenna 2.5 Microphone 2.6 Key Transmitter Tuning SSB Operation CW Operation Operation with a Linear Amplifier Fixed Frequency Operation Inte

2、rnal Cross Channel Operation Mobile Operation DX Operation (Use of Processor) RTTY Operation SSTV (Slow Scan TV) Operation 9 2.7 External Speaker and Headphone 4.21 Operation with a Phone Patch - . -3 2.8 RTTY (FSK) 4.22 Use of Monitor Switch 2.9 Ground 4.23 Novice Operation . . . w % SECTION 3 OPER

3、ATING CONTROLS 9 TS-820 BLOCK DIAGRAM . . 24 3.1 Front Panel Controls SECTION 5 CIRCUIT DESCRIPTION . 25 3.2 Rear Panel Controls 5.1 Block Diagram ? SECTION 4 OPERATING INSTRUCTIONS 16 5.2 Board and Unit . 4.1 Preliminary Procedure 5.3 Final Stage Power Amplifier 4.2 Receiver Tuning SECTION 6 MAINTE

4、NANCE AND ALIGNMENT. 33 4.3 Reading the Operating Frequency 6.1 General Information 4.4 Calibrating the Frequencies 4.5 RF GAIN 4.6 RF ATT 4.7 RIT 4.8 IF Shift 4.9 Noise Blanker 4.10 AGC (Automatic Gain Control) 6.2 Accessories 6.3 . Adjustment of Receiver Section 6.4 Adjustment of Transmitter Secti

5、on SECTION 7 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . 40 . TOP and BOTTOM VIEW OF THE TS-820 42 SCHEMATIC DIAGRAM . 43 TS-820 SPECIFICATION t . . . . . . . . . .#,.#,. ., .* 888, , . # ,888 ,.#,.,., , ,., , ,.# , ,., , 5 .,. , , ., 5 . , , .,. # , ,.,.#,., , t.,$a.#,8.,., ,.,.,., s,.,

6、., , , ., , ., ,., SECTION 1. FEATURES z . , 1 1 1 1 . 1 1 1 1 1 1 . 1 1 1 , 1 , . , , , , , , . , , , , , , . # ,888 .,.,.,.,w.,., , ,.#,.,., , , ., ,., , ,., ,. ,a,., , , . # ,888 .# ,888 ,.,.,w,., , . . , , , , , , . # , , , , , . , , , , Z , . , , , , , , . , , ., , ,.#,.#,., ., ,., , . . , ., .

7、,.,. 1. PLL System. HF Band SSB/CW/RTlY Transceiver checking the modulation condition or adjusting the RF processor. This transceiver employs newly developed PLL (Phase - Locked Loop) circuit. covering 1.8 to 29.7 MHr (WWV 9. Selector Switch for SSB/CW Receive 15 MHz) for SSB, CW and RTTY ooerations

8、. Frequency Response - 2. Minimum Spurious and Excellent Overload and Crossmod. Characteristic - .- The adoption of FET baianced type mixer. MOS FET and single conversion system minimizes spurious during transmission and assures excellent overload and cross- mod. characteristic during reception. 3.

9、Built-in IF SHIFT Circuit IF SHIFT circuit is built in the transceiver to shift IF pass band without changing receive frequency. The circuit is also called the pass band tuning circuit. It allows you to eiiminate radio interference or sei the receive fre- quency characteristic to the desired bandwid

10、th simply by manipulating one control knob. 4. Built-in RF Processo The unique speech processor uses a quick time constant at 455 kHz. Since this circuit is of RF type. it produces little distortion and. unlike the clipper system, does not deteriorate the tonal quality. 5. RF NFB RF NFB from the tra

11、nsmit final stage tothe driver stage improves the cross modulation distortion. The use of the amplfication type ALC further improves the quality of transmit signals. ; 6. Newly Designed Analog Dial The combination of newly designed mono-scale and su- b-dial provides easy reading of frequencies. The

12、adop- 1 tion of a circuit that is completely free from changes in carrier frequencies permits accurate indication of fre- quencies on one dial pointer. 7. Rigid Structure and Easy Operation The transceiver is built with a die casting front panel and a rlgid chassis, providing outstanding mechanical

13、stability for mobile operation. All the operating parts such as control knobs and dials are designed and arran- ged according to human engineering technology to en- sure maximum case of operation. 8. Monitor Circuit The monitor circuit allows you to hear your own voice during transmission. which is

14、normally impossible with conventional transceivers. This 1 s very useful when During CW reception the audio frequency response is automatically narrowed to improve the clarity of sound. 10. Build-in Fixed Channel Circuits with RIT (crystals are optional) The flxed channel circuits with RIT permit th

15、e use with the built-in VFO for more enjoyable operation. 11. Transverter Connector Transverter TV-502 (2m) can be connected for ready operation. Changeover to HF or VHF is accomplished automatically with the power switch of the transverter. 12. Built-in AC Power Supply, and DC Operation with Option

16、al DC-DC Converter DC-DC Converter DS-1 (optton) can be attached to the transceiver for moble operatlon 13. Wide Variety of Auxiliary Circuits and Devices The transceiver is completed with a noise blanker circuit. VOX circuit, side tone circuit. marker circuit. built-in speaker. 3-position AGC switc

17、h. healer switch. IF OUT terminal and linear terminal. The following devices are available as optional extra: Remote VFO (VFO-820). CW Filter (YG-88C). Digitai Display IDG-1). Transverter (TV-502). Microphone (MC-50). Law Pass Filter (LF-30A). 14. Use of Digital Display Dial DG-1 (option) 1) Digital

18、 Display Dial The digital dial of TS-820 indicates transmit and receive frequencies using carrier. VFO and local oscillator signals instead of converting VFO frequencies. Thus. accurate frequencies can be read at all times at any band and any operating made. Since the accuracy of frequencies is set

19、up anly by the 1 MHz standard oscillator, frequencies can be read ac- curately up to 100 Hz order by calibrating the 0Sillat0r with WWV. The green indication on the dial assures many hours Of fatigueless operation. 2) D H (display hold) Switch By pressing the D H switch. the frequency read on the di

20、gital remains on, thus serving as a memory system. SECTION 2. INSTALLATION 2.1 UNPACKING ve. and between 15 and 200 ohms wfll take o w e r from the Remove the TS-820 from its shipping box and packing material and examine it for visible damage. If the equipment has been damaged in shipment. save the

21、boxes and packing material and notify the transportation company immedia- tely. It is a good idea to save the boxes and packing material in any case because they are very useful for shipping or mo- ving the equipment. transceiver with little difficulty. If openwire or balanced type transmission line

22、 is used with the antenna. a suitable an- tenna tuner is recommended between the transceiver and the feed llne Methods of construction and operating such tuners are descrbed in detail in the ARRL Antenna Hand- book. and similar publications. For operation on 75 and 40 meter bands. a simple dipole an

23、tenna. cut to resorlance in the most used portion of the bands. will perform satisfacto- 5 rily For operation of the transceiver on the 10. 15. and 20 The following accessories should be included with the trans- ceiver: meter bands. the efficiency of the station will be greatly in- creased if a sood

24、 directional rotary antenna is used. Re- 1 Operating Manual 1 Microphone Plug 1 Jumpered 9-pin Plug (nstalled) 5 RCA Phono Plugs 1 Alignment Tool 2 Plastic Extension Feet with Screws 1 AC Power Cord 1 Speaker Plug 1 8P US Plug 4 Fuse (6A x 2. 4A x 2) 2.2 OPERATION LOCATION As with any solid state el

25、ectronic equipment the TS-820 should be kept from extremes of heat and humidity. Choose an operating location that is dry and cool, and avoid operating the transceiver in direct sunlight. Also. allow at least 3 inches clearance between the back of the equipment and any object. This space allows an a

26、dequate air flow from the ventilating fan to keep the transceiver cool. 2.3 POWER CONNECTIONS Make sure the POWER switch on the front panel of the TS-820 is turned off, the stand-by switch is put in the REC - position. and that the voltage switch on the back of the TS-820 is switched to the correct

27、line voltage (1 20 or 220). Connect the POWER cord to an appropriate external power source. 2.4 ANTENNA Connect a 5 0 - 7 5 ohms antenna feediine to the coaxial connector on the rear panel. Fixed Station - Any of the common antenna systems desi- gned for use on the high frequency amateur bands may b

28、e used with the TS-820. provided the input impedance of the transmission line is not outside the capability of the PI-out- put matching network. The transmission line should be of the coaxial cable type. An antenna system which shows a standing wave ratio of less than 2 : 1 when using 50 or 75 ohm c

29、oaxial transmission line, or a system that results in a transmission line input impedance that is essentially resisti- . member that even the most powerful transceiver is useless without a proper antenna. Mobile Statlon - Mobile antenna installations are critical. since any mobile antenna for use on

30、 the high frequency bands represents a number of compromises. Many ama- teurs lose the efficiency of their antenna through improper tuning. Remember the following points when using the TS-820 with a mobile antenna. The Q of the antenna loading coil should be as high as possible, There are several co

31、mmercial models available which use high 0 coils. The loading coil must be capable of handling the power of the transceiver without overheating. In the CW mode the power output of the transceiver will exceed 8 0 watts. The SWR bridge is a useful instrument, but unfortunately it is quite often misund

32、erstood. and overrated in importance. Easically. the SWR bridge will indicate how closely the an- tenna load impedance matches the transmission line. With long transmission lines. such as will be used in many fixed station installations. it isdesirable to keep the impedance match fairly close in ord

33、er to limit power loss. This is parti- cularly true at the higher frequencies. The longer the h e . and the higher the frequency, the more important SWR be- comes However. in mobile installations the transmission line seldom exceeds 20 feet in length, and an SWR of even 4 to 1 adds very little power

34、 loss. The only rime SWR will indicate a low figure is when the antenna presents a load close the 50 ohms, but-many mobile antennas will have a base nmpedance as low as 15 or 20 ohms at their resonant frequency. In such a case. SWR will indlcate 3 or 4 to 1. and yet the system will be radiating effi

35、ciently. The really important factor in your mobile antenna is that is should be carefully tuned to resonance at the desired fre- quency. The fallacy in using an SWR bridge lies in the fact that it is sometimes possible to reduce the SWR reading by detuning the antenna. Field strength may actually b

36、e redu- ced in an effort to bring SWR down. Since field strength is the primary goal, we recommend a field strength meter for antenna tuning. For antenna adjustments. the transceiver may be loaded lightly, using the TUN position instead of operating at full power output. This will limit tube dissipa

37、tion during adjust- ments. and will also help to reduce interference on the fre- quency. In any case, do not leave the transmitter on for very : long at one time. Turn it on just long enough to tune and - load. and get a field strength reading. Start out with the an- tenna whip at about the center o

38、f its adjustment range. Set the VFO to the desired operating frequency and then adjust c the PLATE control for a dip. and then the LOAD control. Then observe the field strength reading. The field strength meter may be set on top of the dash, on the hood, or at an elevated location some distance from

39、 the car. Change the whip length a half inch. or so at a time. retune the finals each time. and again check the field strength at the antenna. Continue this procedure until the point of maxi- mum field strength is found. This adjustment will be most critical on 75 meters, somewhat less critical on 4

40、0. until on 10 meters the adjustment will be quite broad. After tuning the antenna to resonance. the finals can be loaded to full po- wer. 2.5 MICROPHONE Attach the microphone connector to a suitable microphone as shown in Figure 2. Besure that the PTT switch of the mi- crophone is separate from the

41、 microphone circuit, as shown in Figure 3. It should be noted that a microphone with a 3P plug having a common earth terminal cannot be used. The microphone input is designed for high impedance (50k ohms) microphones only. The choice of microphone is im- portant for good speech quality. and should b

42、e given serious * consideration. The crystal lattice filter in the transceiver pro- vides all the restriction necessary on audio response. and further restriction in the microphone is not required. It is - . more important to have a microphone with a smooth. flat re- sponse throughout the speech ran

43、ge. The microphone manufactures instructions should be follo- wed in connecting the microphone cable to the plug. With many microphones. the push-to-talk button must be pressed to make the microphone operative. For PTT operation. this feature may be disabled. if desired. by opening the micro- phone

44、case and permanently connecting the contacts which control the microphone. The standard microphone sensitivity is within the range of 50 dB to -60 dB. If a microphone having a higher sensi- tivity is used. the ALC circuit will not function properly. In this case, insert an attenuator as shown in the

45、 illustration at right or connect a resistor (10k - 33k ohms) in parallel with the capacitor 1 0 0 pF (C94) in the IF unit (X48-1150-00) of the transceiver. MIC TS 820 MIC Connector 2.6 KEY If CW operation isdesired, connect a key to the KEY jack. 2.7 EXTERNAL SPEAKER AND HEADPHONES Receive audio ou

46、tput from the TS-820 is 1.5 wattat 4 to 16 ohms The TS-820 has a built-in speaker. However. if an external speaker is desired for fixed station or mobile opera- tion. Simply connect it to the SPEAKER jack on the real pa- nel. The speaker may be any good 8 ohm permanent ma- gnet type in the 4 inch or

47、 large sire. The internal speaker is disconnected when an external speaker is used. Headphones should also be 8 ohms impedance. When the headphones are connected to the front panel PHONES jack the speaker is disabled. 2.8 RTTY (FS K) For RTTY operation. connect a teletypewriter to the RTTY KEY jack on the rear of the transceiver. Since this jack is connected to the switching circuit for shifting frequencies. a relay should be inserted in the closed loop of the teletypew- riter for keying op