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Heathkit SW-7800 Manual
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Heathkit SW-7800 Manual

General coverage receiver
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HEATHKIT
MANUAL
COMPANY
BENTON HARBOR, MICHIGAN
HEATH
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Summary of Contents for Heathkit SW-7800

  • Page 1 HEATHKIT MANUAL COMPANY BENTON HARBOR, MICHIGAN HEATH...
  • Page 2 ‘Computers — Utlites Systems, Languages, 982-3060 ‘Operating (616) Programs... ‘Application 982-3884 (616) rceWe — YOUR HEATHKIT 90-DAY LIMITED WARRANTY ‘Consumer Protection Plan for Heathkit Consumer Products caaily Peas Consumo Protaeson UNITED WARRANTY Gran ‘efornance. read Fass nish A Te ‘Ectoed...
  • Page 3 Heathkit® Manual for the GENERAL COVERAGE RECEIVER Model SW-7800 595-3052 WARNING: PREVENT FIRE OR SHOCK HAZ- DO NOT RAIN ARD, THIS RECEIVER EXPOSE OR MOISTURE, Copyright 1984 © Heath Company HEATH COMPANY Reserved Rights United America Sates BENTON HARBOR, Printedin...
  • Page 4 Page2 Heathkit TABLE OF CONTENTS .... Receiver Board Alignment INTRODUCTION FINAL ASSEMBLY UNPACKING INSTRUCTIONS ......... INSTALLATION ASSEMBLY NOTES PANEL OPERATION FRONT CIRCUIT BOARD Freee Functions Control List Parts ..Assembly Step-by-Step Reception Guide eras Frequency Conversion Definitions CHASSIS.
  • Page 5 Page Heathkit NTRODUCTION General Heathkit selectivity Model SW-7800 Coverage sensitivity Excellent © synthesized receiver designed primarily ceiver listener shortwave with mind. switch covers time-constant avid © continuously through over- circuits front-end MHz bands. Broadband lapping, Muting provision allows operation with ©...
  • Page 6 Heathkit INITIAL TESTS VOLUME switch )_-Be-Zure the Power the Manual, you will perform cer- In this section counterclockwise) (turned fully control) that your Receiver operates prop- tests to verify tain results obtain correct you do erly. NOTES: the “Possible Cause...
  • Page 7 Page Heathkit NOTES: connected negative (black) resistance com- readings following steps test some ohmmeters, this lead. In wiring taken with were taken a VI'VM. Readings erroneous interchanged, readings may other ohmmeters different with (because result. Interchange ohmmeter leads measuring voltages...
  • Page 8 Heathkit ALIGNMENT circuit built into your Receiver An RF detector Refer to Pictorial and place small tape in the procedure. The only to aid you near the alignment the longer alignment “flag” center (digital will need multime- tool This will help you equipment as shown.
  • Page 9 Page Heat vacuum-tube taken with indicated circuit voltages were touch only the sure readings that you otherwise voltmeter might short connec- (VTVM). point. circuit indicated within those should + 20% tion and integrated (IC) damage the steps transistor, example. ALIGNMENT SYNTHESIZER BOARD until...
  • Page 10 Pictorial inset drawing #1 Refer circuit boat controller install the Reinstall the small jumper wire between wire cover shield before circuit shields. Push down sockets synthesizer solder the cover to the shields in the board), places shown. Page SW-7800/595-3052 591-4547...
  • Page 11 Page Heathkit RECEIVER BOARD ALIGNMENT external have antenna connect NOTE: (Illustration Booklet Pictorial Refer station WWV in the Receiver receive steps. following for the Page following steps. sure connected your Make no antenna tune switch to 10 (MHz) BAND Receiver to 10.000 MHz.
  • Page 12 Page ANTENNA SHEET METAL SCREW BOTTOM COVER, PICTORIAL...
  • Page 13 Page Heathkit FINAL ASSEMBLY Receiver Position the top cover Pictorial following steps. Refer 6-32 shown. Then screws 3/8” sheet screws (the metal cover secure without bottom cover Locate cover the chassis. near hole one corner). 1/2" indicated collapsable Push paper...
  • Page 14 Page INSTALLATION nondirectional Dipole Inverted-V antes obtain satisfactory shortwave reception, your This connected outside optimized shortwave designed should reception. have antenna ceiver this feature rect broad- allows built-in, nondirectional antenna telescoping (The antenna well from all directions. Therela equally portable Also, signals cast...
  • Page 15 Page Heathkit other the antenna. Connect 3/8-inch lead-in 8-foot length, Ground — terminal lead-in wire needed ground NOTE: diameter. Receiver. cold of your ground, rear panel an alternate such house. pipe water your the ground Generally, higher antenna better tree...
  • Page 16 Heathkit Page dipole inverted-V antenné support center or Inverted-V Dipole and both Dipole from ground should be 20-100 feet ground. Note thél feet from least supports will good recep- provide antenna 100 feet long between the center support ‘An angle...
  • Page 17 Page Heathkit twist 2-conductor form POWER SOURCE EXTERNAL Loosely wires sufficient insulation from cable. Then remove wire connect shell each so you your pins and Conne large 2-pin plug pro: this external end. source power source vided DC power such...
  • Page 18 OPERATION VOLUME electronics, familiar with before the “Definitions” to refer on Page wish Receiver. Applies power other this refer information section level received signal. The volume audio These definitions define Manual. some this control clockwise rotation with creases terms. frequently used more MODE...
  • Page 19 Page Heathkit about When length MHz (200 you have lead-in kHz). NOTE: Connect random from wire terminal. signal correctly, the will indi- uned display that about cate frequency kHz. (.001 than the end of frequency transmit- Connect 002 MHz) lower...
  • Page 20 Page Heathkit RECEPTION GUIDE POWER that lists external Interconnect socket conditions prevail to 15 the reception This guide fall conditions such automobile capable These battery, source, in the spring year. current least conditions supplying atmospheric varying ampere subject extent, weather...
  • Page 21 Page Heathkit FREQUENCY CONVERSION DEFINITIONS display Receiver reads refers of your frequency Modulating: This the process of com- term shortwave However, referred some bands with frequencies at the tran: pining term expressed by the “wave length” meters. result that frequencies...
  • Page 22 Page Heathkit (CW): This trans side Continuous a process each Wave band frequencies Sideband: Morse code, with radio mitting frequency called side- transmitter carrier frequency this intelligence is produced fre- modulation. case, sideband (USB) band band. upper radio interrupted frequency...
  • Page 23 Page Heathkit OF DIFFICULTY IN CASE that fault and search after which components could any trouble Begin occurs your typical indications specific voltage assembly carefully following the steps listed give direct This may also component. chart under After below “Visual you complete Checks.”...
  • Page 24 Page Heathki PRECAUTIONS FOR TROUBLESHOOTING the “Circuit Description” review trouble help determine where also any terminals sure short ground voltage still trouble after measurements. probe when located make have short slip, across voltmeter example, compo Checks,” and should complete the “Visual very likely those voltage...
  • Page 25 Page Heathkit General (Cont’d.) ‘CONDITION POSSIBLE CAUSE signal Q406, Laz6, Dazg, sound ‘Signals USB and modes. identical Q405, bast swe, attenuator function. D414, does signal Weak reception aoa, signals mode, okay, the SSB modes, 403. signals okay Udo6, 2406, 0428.
  • Page 26 Page Heathkit CIRCUIT BOARD CONTROLLER POSSIBLE CAUSE CONDITION 304, U305. 16-volt source missing (about volts). 1308, D209. pope 0323 2322, 6328. the receiver circuit board). R609 12-volt source missing, output shielded cables. C3 (tuning capacitor) Q316 through 0318. output L301 Output cable.
  • Page 27 Page Heathkit CIRCUIT SYNTHESIZER BOARD POSSIBLE CAUSE CONDITION voltage at TP201 injection. (You 10 MHz oscillator chart check this using the RF detector. Controller circuit Connect the un- L202,1203. board. from AF to a wire Y20t should measure 2.5 volts ‘grounded end...
  • Page 28 Page Heathkit LOGIC LEVELS lists logic levels following various chart each position Band your Receiver points switch, the Receiver operating properly. logic indicates while indicates voltage volt, logic in the 15-volt Refer to NOTE: range. test (they Schematic location each...
  • Page 29 Page Heathkit SPECIFICATIONS GENERAL Frequency Coverage thirty 150 kHz. 30 MHz MHz ranges. Readout Frequency digits. LEDs Readout Accuracy nearest kHz, Frequency Control Synthesized (PLL VFO), Modes LSB, and CW/USB, (wide narrow). Sensitivity: SSB/CW Less than 10 dB, (S-+NY/N. Less...
  • Page 30 Page Heathkit OTHER SPECIFICATIONS Connections telescoping provided Built-in whip. Antenna unbalanced, external antenna (SO239) 50 ohm, wire. high-impedance jack headphone Internal speaker/phone Audio Output nal speaker with transmitter jack External mute for use Muting jack Miniature phone Recorder Output internally...
  • Page 31 Page Heathkit CIRCUIT DESCRIPTION Refer Schematic (fold-in) and the Block 201-299 Dia- mounted Parts synthesize (Illustration Booklet, Pages 40-42) grams while circuit board. read the following information. component numbers are the following groups arranged 301-399 mounted Parts on the controller...
  • Page 32 Heathkit Page the controller circuit board circuit inverter ‘An modes, amplified sig- USB/CW to 15-volts DC for supply 12-volt converts the detector. buffer to passes through product circuits. other synthesizer frequency oscillator) activated (beat also applied that this mode signal...
  • Page 33 Page Heathkit CIRCUIT DESCRIPTION DETAILED detail each circuit This section ribes Block erates. Refer to the Schematic as you read about following circuits. grams Filter RECEIVER CIRCUIT Mixer signal mixes the with Integrated circuit U401 Receiver Input signal, oscillator local...
  • Page 34 Page Heathkit switch activates BFO Q406, Active Filter, Audio Amplifier, and Mute Mode section product detector U406. switch Q405, mode, applied through USB/CW signal audio preamplifier tran- coming from ‘The capacitors through C503 each circuit. Coil L426 When mode switch sistor SW2.
  • Page 35 Page Heathkit from select coupled U201 output also through U213 up-counter, pins digit this while pins formed U208, U209, U211, and select U212, where through through deci- the segment to be displayed. Pin made. correction drives point, Input frequency counter...
  • Page 36 Page Heathkit opposite direction develops when unwanted products). The fil- voltage remove any mixing increases. then signal applied U214 frequency tered match, pin phases both signals signal When buffers the (referred to Transistor Q222 logic high. This pulses riding keeps...
  • Page 37 Page Heathkit other ables U303B bands selected. whenever value Whenever the bandswitch switch exceeds adder Their output the carry from becomes logic inputs high, which auto- causes line bandswitch U301, matic carry to U301 logic causes sum. This and remain...
  • Page 38 Heathkit Page each band logic levels summary below. is shown logic point ‘Filter Select. Logic Switch Band —_—Divider _CHUKE Points Range Logic Logic (MHz) Output Lines 3456 GHIKL ABCDE 43210 100000 101000 000111 00000 010000 01000 001000 00001 «001000 11010...
  • Page 39 Heathkit Page consists hartley circuit oscillator ‘The consists (Q316) of an colpitts oscillator buffers Q317 Switch buffer transistors Q318. (Q324) Q319 Main Q325. tuning capacitor Q321 coil remove additional trimmer L306 tune this oscillator. Diode D311 capacitors C314 and C316,...
  • Page 40 Page Heathkit SEMICONDUCTOR IDENTIFICATION CHARTS DIODES cIRCUIT HEATH MAYBE IDENTIFICATION PART REPLACED COMPONENT with NUMBER NUMBER D313, DST, Dats, D416, Data, D419, Daze De02-02% 0305-030 Dati, 56-56 1Na149 401-D40~, Dat1-0413. D421 D417, 423, D431 D308, D309 56-93 FO-333 D429 86-97...
  • Page 41 Page Heathkit ciRcuIT HEATH MAYBE COMPONENT PART REPLACED IDENTIFICATION NUMBER NUMBER WITH D201 412-79 TiL209 TRANSISTORS CIRCUIT HEATH MAYBE COMPONENT PART REPLACED IDENTIFICATION NUMBER NUMBER WITH 9319, a321, 417-134 MPS6520 2405 2203, a204, 2206-0208, 417-172 mPsés2t O2i1-c219, 221, 0222, a318...
  • Page 42 — Page Heathkit (ICs) CIRCUITS INTEGRATED MAYBE ciRcUIT HEATH IDENTIFICATION REPLACED PART COMPONENT (TOP VIEW) NUMBER NUMBER 555. 482-53, us04 7805 442-54 1349 442-55 v2t4, usor, 1496 442-96 tenuaae...
  • Page 43 Heathkit CIRCUIT HEATH MAYBE COMPONENT PART REPLACED IDENTIFICATION NUMBER NUMBER with (TOP VIEW) 442-602 442-627 442-695 442-715 207, u213...
  • Page 44 Page Heathkit cincur HEATH pant component REPLACED IDENTIFICATION numer wits (TOP NUMBER VIEW) oaleze aLsi61 42.760 8en3 449.778 vauso2 uso1,us0e 44s-008 4008...
  • Page 45 Heathkit Page 133, ciRcuIT HEATH COMPONENT PART REPLACED IDENTIFICATION NUMBER NUMBER (TOP VIEW) 443-998 7216 443-1146 14568, u204 443-1147 14526 443-1151 14855...
  • Page 46 Your payment solder, ‘cannot core © paste flux with acid not covered by warranty. repair.) a Heathkit Heath Company Mail letters deliver your convenient, personally Ifit is parts Benton Harbor sup- replacement, For warranty Electronic Center. slip. sales...