Heathkit-SG-6-Signal-generator-manual 电路图 维修手册.pdf

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1、ASSEMBLING AND USING YOUR -II e_a/z.k ii: - Signal Generator Model SG-6 THE HEATH COMPANY BENTON HARBOR, MICH. PRICE $1.00 . RadioFans.CN 收音机爱 好者资料库 ,. U S E F U L , , . , INFORMATION FOR KIT BU I L DE Rs Resistors are identified by a color code used in several bands around the resistors. There are

2、two general types o resistors. One, the uninsulated type, has the connecting wires bound around the ends. The other, the insulated type, has the wire connected internally and coming out the ends. The resist- ance code uses three bands or colors, while a fourth, usually silver or gold, indicates the

3、tolerance. The colors are arranged so that the first two indicate the first two figures of the resistance, while the third indicates the number of digits (zeros or multiplier) which follow the first two figures =l!ID=w. =m F Aw On uninsulated resistors, the body is the first figure, the end color th

4、e second figure, and the dot the number of digits. On insulated resistors, the band nearest the end is the first figure, the next band is the second figure and the third band the number of digits. -1 1W. f=1w. WATTAGE. Resistors are rated as to wattage (power dissipation) according to size. The char

5、t shows approximate sizes which vary with manufacturers. To determine wat- tage size necessary multiply current through resistor in amperes by voltage drop across resistors in volts. Example -A plate loading resistor for a tube drawing 10 milli- amperes (.01 Amperes) has a voltage on one side of 300

6、 volts and on the other side 200 volts, giving a drop of 100 volts. Therefore 100 volts X .OlA. = 1 Watt. =1111 A higher wattage resistor can always be substituted for smaller size. WATTAGE SIZES Uninsulated Body Color End Color Dot Color UNINSULRTED Examples INSULATD TYPE Insulated First Ring Secon

7、d Ring Third Ring TYPE Forth Band (01or 11rJ111t Ftg11re econd .tlgure N_u1nbtr of Dlglt11 !Or Tolerance Black 0 Brown l Hect 2 Orange 3 Yellow 4 Green 5 Blue fi Violet 7 Gr ey 8 White 9 llF:!J!TANCF: I OllM 50 250 1fi00 o.ooo 220,000 l Meg ohm 0 None l 0 2 00 3 ,000 4 0,000 5 00,000 6 000.000 7 0,0

8、00.000 BROWN RED ORANGE 8 00.000.000 1 2 000 9 000.000.000 Some Popular Sizes of Resistors DOD OR JJR!T HAND JND OR t:lONU H .ND G reen Black Htl (;n,n B rown Gnn 6range Blak TI0d Hect Brown Black The fourth ring or othr (nd may be silver (10% tolerance) or gold (5% to lfrn ne ) 0 1 it may he on1itt

9、td entirely Vhich indicatrs 201 tohrancl. Condenser Code Condensers use the same code as resistors and are read in micromicrofarads. BROWN RED ORAllluE 1 z. 000 DOT OR TlllRD HAND Dlack Hrow n Hd Orang- Yellow Green If there is one row of dots, they are read in direction of arrow or if manufacturers

10、 name appears in the same direction as name. If two rows of dots appear, it can either pc of two different codes: The RMA or the AWS (American War Standard). In the RMA, the top row of dots are the first three figures (carried to three figures), the bottom row are left to right the voltage rating, t

11、olerance, and decimal multiplier. In the A WS code, the top row of dots art the first three figures while the bottom row are, left to right, characteristic, tolerance, and decimal multiplier. Examples R.MA AVVS RED GREEN BROW BROWN RED GREEN 13ROWl 100 250 500 1000 3000 10,000 MF. .00001 .00005 .000

12、1 .00025 .0005 .001 .003 .01 FIRST DOT Brown Green Brown Red Green Brown Orange Brown Condensers SECOND DOT Black Black Black Green Black Black Black Black The tolerance rating corresponds to the color code, i.e., red-2o/r, green -So/r, etc. THIRD DOT Black Black Brown Brown Brown ed Red Orange The

13、voltage rating corresponds to the code multiplied by 100. Example: Orange dot -300 volt rating; Blue -600 volt rating. RadioFans.CN 收音机爱 好者资料库 Assembly and Operation of the Generator Heathkit Signal Model SG-6 SPECIFICATIONS FREQUENCY RANGE Band A . : . 160 Kc to 510 Kc. Band B . 500 Kc to 1,650 Kc.

14、 Band C . 1.65 Mc to 5. 7 Mc Band D . 5.4 Mc to 19 Mc Band E . 17 Mc to 50 Mc . Calibrated Harmonics . 51 Mc to 150 Mc RADIO FREQUENCY OUTPUT . In excess of 100,000 microvolts. MODULATION FREQUENCY . Approximately 400 cy;:les. AUDIO OUTPUT . 1 to 2 Volts. , . . AUDIO FREQUENCY INPUT . Approximately

15、5V across 1 Megohm TUBES 6C4 RF Oscillator . 6C4 Audio Oscillator or Audio Amplifier . POWER REQUIREMENTS . 105-125V. 50/60 cycles . . Page 1 RadioFans.CN 收音机爱 好者资料库 The Heathkit Model SG-6 Signal Generator has been designed so that with simple easy assembly the kit builder can construct a signal ge

16、nerator which will give him excellent performance and is both pleasant and easy to use. This generator has been engineered so that it will be valuable to the radio repairman, ham, or experimenter over a wide range of uses in addition to being a rugged and highly dependable piece of test equipmentmad

17、e of the highest quality parts through- out. PRELIMINARY INSTRUCTIONS AND NOTES Before starting construction be certain to read the manual through completely and note all dia- grams and pictorials. In the step by step procedure, when actually assembling and wiring, read the whole article through (ar

18、ticles are numbered 1, 2, 3, etc.) so that no suggestions in the article will be missed. To facilitate describing the location of parts, solder lug positions have been numbered, and tube socket positions have been lettered as in Figure 1. Refer to this figure when instructions say, mount solder lugs

19、 4 and 5, etc. Also note that both the schematic diagram and Figures 5 and 11 show all switch contact lugs numbered. The code is as follows: for example, M3 indicates, M for modulation switch and 3 for contact solder lug 3. BR6 means, B for bandswitch, R for rear deck, and 6 for contact lug 6. There

20、fore when mounting switches, be sure to mount them with the same relative position as shown in the pictorials. Likewise, be sure and mount tube sockets as pictured. When wiring, and instructions say, connect to right hand lug of the two lug terminal strip, etc. consult Figure 1 for clarity. It is re

21、commended that tube sockets A and B on figure 1 be actually labeled A and B on the chas- sis with a pencil. Also writing the names of the controls on the inside of the chassis where wir- ing is done will reduce the possibility of wiring to improper controls by mistake. An A, B, C, D, or E written by

22、 the coils on the sub-chassis might prove helpful. Read the note on soldering on the inside of the back cover. Make a good mechanical joint of each connection with clean metal to clean metal. Use only good quality rosin core radio type solder. Pastes or acids are difficult to remove and minute amoun

23、ts left combine with moisture from the air forming a corrosive product. Weeks or months later corrosion may result in untimely fail- ure. NOTE: ALL GUARANTEES ARE VOIDED AND WE WILL NOT REPAIR OR SERVICE IN- STRUMENTS IN WHICH ACID CORE SOLDER OR PASTES ARE USED. Small changes in parts may be , made

24、 by the Heath Company. Any part supplied will work just as well as the part for which it was substituted. All substitutions will be of equal or better qual- ity than the original, and will be made in order that a minimum delay will occur in filling your order. Resistors aqd controls have a tolerance

25、 rating of plus or minus 20% unless otherwise stated. Therefore a lOOK ohms resistor may test between 80K and 120K ohms. The letter K stands for 1,000 and M for 1,000,000. Thus.a resistor marked 90K=90,000 Ohms, etc. Frequently conden- sers show an even greater variation such as minus 50% to plus 10

26、0%. This Heathkit is designed to accomodate such variation. The tube socket pins are numbered from 1 to 7 starting at the spacing and reading clockwise when viewed from the bottom. See Figure 2. A circuit description is included in a later section of this manual so that those with some knowl- edge o

27、f radio will be able to obtain a clearer picture as to the actual workings of this equipment. It is not expected that those with little radio experience will understand the description com- pletely, but it should be of help in the event that they desire to become more familiar with cir- cuit operati

28、on and thus learn more from building the kit than just the placing of parts and wiring. In any case, this section points out the use of the various controls and switches. Page 2 STEP BY STEP ASSEMBLY Use of bare wire where indicated will facilitate wiring, but insulated wire may be used. Place spagh

29、etti (insulated sleeving) over bare wires on condensers or resistors where riecessary to prevent the leads from accidentally touching other bare wires or metal parts. (S means solder (NS) means do not solder yet Begin by checking the parts against the parts list. Identify each part, using the charts

30、 on the inside of the cover of this manual where necessary. Thus, you will avoid throwing away any small parts with the packing. MOUNTING OF PARTS ON CHASSIS 1. On the chassis (SG62) mount with3-48x t screws (SW34) and 3-48nuts (SW35 the miniature tube sockets (SW26 as shown in pictorial 1. (Sockets

31、 A and B of Fig. l Note that the widest spacing of the pin holes is toward the center of the chassis. This spacing is indicated in Fig. 2 as is the pin numbering used for such socket. Observe that the numbering is clock- wise starting from the spacing, and is read on the under side of the socket. In

32、stall the four t rubber grommets (035) in the holes in the chassis . BOTTOM SIDE OF CllA551S -. . Q A ,._2. LEFT llAND Ll.16 MJ_LE RIGHT HAND LUTRl/CTION Fig. 1 4 BOTTONI OF SOCKET Wtdef 5/JaCif:tl Jj between Pin, Holes . _. 5JETCH 5HOWIN6 THE NUMBERING /JSED Oii THE MINIATURE TUBE SOCKETS . _ . Fig

33、. 2 2. Mount the power transformer (V98) on the chassis by means of two 6-32 x t screws and two 6-32 nuts using a #6 lockwasher directly under the nut. Mount the 2 lug terminal strip (S32) and a solder lug (lug 3) with a 6-32 x t screw and nut. Next comes the 3 lug terminal strip (SW37) fastened by

34、a -6-32 x t screw, lockwasher, and nut. 3. On top of the chassis, with two 6-32 x t screws, fasten the AF choke marked SG-61, and on the under side of the chassis on each of the two screws place first a solder lug (lugs 1 and 2) and fasten with a nut. The choke should be placed so that its two leads

35、 are on the side near- est the closest grommet and the leads should be passed through this nearby grommet. 4. On the under side of the chassis mount th selenium rectifier (V97) with a 6-32 x 1 screw and a lock:washer under the nut. Mount it with the r.ed or red edged side visible (see Fig. 3) and it

36、s solder lugs pointed in direction as shown in pictorial 1. 5. Mount solder lugs 4 and 5 with a 6-32 x t screw and nut. Page 3 MOUNTING OF PARTS ON FRONT PANEL 6. Place the panel (SG52) against the front of the chassis and using a control lockwasher, nickel washer, and control nut as shown in Figure

37、 4, mount iri turn, the EXT - INT modulation switch (SG51), the attenuator switch (SG50), the AF IN - OUT control 056) and the RF out- put control (SGll). Line up these controls with lugs and contacts in the same positions as shown in Figure 5. RED S!DEOR RED ED6E IS POSITIVE (+l V97 SEL.ENtUM RECTI

38、FIER Fig. 3 NICKEL WA91R CONTROL 1T ) - PANEL CONTROL LOCK WASHER. -Mmfffl HOW TO MOUNT CONTROLS SWITCHES Fig. 4 0 SI n S2. ,-. All 0 A3 A2 MOUNT ALL CONTROLS WITH LUGS LOCATED AS SHOWN AC30VE Fig. 5 7. Assemble and mount the pilot light as shown in Figure 6. This uses the pilot light lamp 039) sock

39、et (052), nut (040), bushing (041) and jewel 042). Note that the pilot light mounting is just above the RF output phone jack hole. (Pictorial 2) 8. Next come each of the 3 phone jacks Kl 7): RF OUT; AF OUT: and AF IN! Mounting is as follows: place a control lockwasher on the threaded section before

40、slipping it through the hole in the panel, slip the threaded section through, put on a nickel washer (on outside of panel) and fasten with a nut. (Figure 7) In mounting these three phone jacks, make certain that the soldering lugs and the clip which touches the tip of the phone plug are oriented as

41、shown in pictorial 2. Otherwise, the wiring to these plugs could easily interfere when the chassis is slipped into the cabinet. - L/16 WHICH TOI/CHES METAL SLEAVE GROUND LU6 II 8-W.1111/ . _ LUG WHICH CONNECTS TO TIPU)NTACT 5PR!N6 HOT LllT/ PILOT LIGHT ASSEMBLY Fig. 6 PHONE JACK A55MBLY Fig. 7 Suffi

42、cient parts are now mounted so that wiring can begin. Page 4 WIRING PROCEDURE 9. Wire in the power transformer (V9S) as shown in pictorial 1 and as follows: twist the two black leads together, cut them to proper length, and fasten them to the two outside lugs of the three lug terminal strip (NS). Fa

43、sten one yellow lead to solder lug 1 (NS) and the other yel- low lead to pin 4 of tube socket A (NS). One red lead goes to solder lug 1 (NS) and the other red lead connects to the bottom lug lug furthest from the red edged insulator piece) of the selenium rectifier S). Wire from pin 4 of socket A (S

44、) to pin 4 of socket B (NS). Note that this wire follows along, and is close to, the bend of the chassis. Wire from pin 4 of socket B S) to the pilot light HOT solder lug (S) (see Fig. 6) passing the wire through the nearby rubber grommet. Ground the pilot lights GROUND solder lug to the pilot light

45、 frame (S). Wire from pin 3 of socket B (NS) to solder lug 3 (NS). Wire from pin 3 of socket A (NS) to solder lug 2 (NS). 10. To the left hand lug of the 3 lug terminal strip, fasten one lead of a .001 MFD condenser (SG46) (NS) and this condensers other lead connects to solder lug 5 NS). Note that l

46、ead near outside foil or black ring marking on body of condenser is the lead which goes to the solder lug (ground). Hereafter, whenever condensers are grounded, have the outside foil lead as the grounded lead. Connect the other .001 MFD condenser to the middle lug of the 3 lug terminal strip (NS) an

47、d its outside foil lead to solder lug 5 (S). 11. Note that the RF output -AC off control has two solder lugs protruding from the back of it. Twist two pieces of wire together, and wire from controls back lugs, (lugs Sl and S2, Fig. 5) (S) to the middle NS) and right hand solder lugs (S) of the 3 lug

48、 terminal strip. Refer to pic- torial 1. 12. Wire from the upper lug (the lug nearest the red edge insulator piece) of the selenium rec- tifier (S) to the right hand lug on the two lug terminal strip (NS). To this right hand lug also connect one lead (on the side marked positive or with a+ marking) of t