Heathkit HM-2140 Manual
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Heathkit HM-2140 Manual

Heathkit HM-2140 Manual

Hf dual wattmeter
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  • Page 2 ~~=~e~E~E~:::~B~e~e~e~e~e~;;~=~=~?e~~e~:~:;';::;';:;';:;';:;';:;';:~J;';:;';:;';:;';e;';f;';e;';f;';:;';:;';;~"';"'~:"':"'~:""""':"'="'~"""'" HEATH COMPANY PHONE DIRECTORY YOUR HEATHKIT gO-DAY LIMITED WARRANTY The following telephone numbers are direct lines to the departments listed: Consumer Protection Plan for Heathkit Consumer Products Kit orders and delivery Information..(616) 982-3411 Welcome to the Heath family.
  • Page 3 Heathkit® Manual HF DUAL WATTMETER © Copyright 1979 Heath Company HEATH COMPANY All Rights Reserved BENTON HARBOR, MICHIGAN 49022 Printed in the United States of America...
  • Page 4 _pa_ _e_2 In Case of Difficulty Troubleshooting Chart Step-by-Step Assembly Circuit Board Assembly " 12...
  • Page 5 Page 3 ~H£i------------------------------------------------------ The HF Dual Wattmeter Model HM-2140 measures forward and reflected available. No additional plug-in modules are required to cover the power or power in transmission lines for frequencies between 1.8 and 30 MHz. frequency ranges. The Wattmeter is housed in a small, attractive, readily portable cabinet.
  • Page 6 _pa_g_e_4 IMPORTANT: Before you begin to assemble this kit, be sure to read the Capacitors will be called out by their capacitance value in pl (picofarads) or (microfarads) and type. information in the "Kit Builder's Guide." f-LF When you perform the steps in the circuit board Pictorials, position Each circuit part in an electronic kit has its own component numbe each part as shown.
  • Page 7 Page 5 --------------------- Unpack the kit and check each part against the following list. Any part that is packed in an individual envelope with the part number on it should be placed back in the envelope after you identify it until all parts are accounted for.
  • Page 8 _p_ag_e_6 KEY HEATH QTY. DESCRIPTION CIRCUIT KEY HEATH QTY. DESCRIPTION CIRCUIT Part No. Camp. No. Part No. Camp. No. 6-103-12 10 kG (brown-black-orange) R7, R11 25-885 electrolytic C5, C6 6-153-12 15 kG (brown-green-orange) R19, R21 27-136 .015 Mylar* 6-473-12 47 kG (yellow-violet-orange) R12, R16 27-137 Mylar*...
  • Page 9 _,--------------------------p-a- KEY HEATH QTY. DESCRIPTION KEY HEATH QTY. DESCRIPTION Part No. Part No. 250-432 90-1223-1 Cabinet top 6-32 x 5/16" truss head screw 90-1224-1 Cabinet bottom 250-89 6-32 x 3/8" screw 203-1919-1 Front panel 250-347 #6 x 1" sheet-metal screws 205-1588 Side trim 252-3...
  • Page 10 _pa_ g e_8 KEY HEATH QTY. DESCRIPTION CIRCUIT KEY HEATH QTY. DESCRIPTION CIRCUIT Part No. Part No. Compo No. Compo No. 10-390 436-49 Power jack 20 k11 control R3, R5, R13, R14 19-739 455-633 Knob bushing 250 k11 control with switch R1/SW5 64-62 462-932...
  • Page 11 Page 9 ~-------------------- Remote Sensor Assembly (#100- 1749) The Remote Sensor Assembly is a sealed unit which contains the following not break the seal on the Remote Sensor Assembly; to do so may void the parts. This Assembly has been factory tested and aligned. CAUTION: Do warranty.
  • Page 12 _pa_g_e_10 KEY HEATH QTY. DESCRIPTION CIRCUIT KEY HEATH QTY. DESCRIPTION CIRCUIT Part No. Compo No. Part No. Compo No. 253-1 #6 fiber flat washer 75-30 Strain relief 254-1 #6 lockwasher 85-2038-1 Printed circuit board 257-12 #6 brass eyelet 204-9 Angle bracket 214-215 Cover 259-6...
  • Page 13 Page 11 ~-------------------- Eveready #216 or # 1222 Mallory #M1604 Mallory #TR-146X (long life) Burgess #2V6 ReA #VS323 Hellesens #410 Varta #438 The separate "Illustration Booklet" contains numbered illustrations (Picto- rials, Details, etc.) that are too large for the Assembly Manual. The step-by- step assembly instructions will direct you to the proper illustration in the Booklet.
  • Page 14 _pa_g_e_12 NOTE: To prepare a wire, cut it to the length indicated and remove 1/4" insulation from each wire end. Tightly twist the bare wire ends and add small amount of solder to hold the fine strands together. Locate the remote sensor and cable. Cut the cable 12" from the free wire ends.
  • Page 15 Page 13 IMPORTANT: TRE BANDED ERD OF DIDOES C~R BE MARKED IN A NUMBER OF W~YS. START. Prepare a 2-1/2" black wire. Connect this wire between the two holes as NOTE: When you install a diode, always match "H" shown. the band on the diode with the band mark on the circuit board.
  • Page 16 Refer to Detaill-2A and locate pin 1 of the Ie. R18: 1000 il (brown-black-red). Then install the Ie so pin 1 is inserted into hole Wrap the leads of a .02 Mylar capacitor 1 on the circuit board. Make sure all of the IC around the leads of a 16.5 kil (brown- pins go through the circuit board before you blue-green-red) precision resistor.
  • Page 17 pa_g_e_15 NOTE: When you install ceramic capacitors, do Mount the power jack (#436-49) not push the insulated portions ofthe leads into firmly down onto the circuit board as the circuit board holes. This could make it dif- shown. Then solder its lugs to the foil. ficult to solder the leads to the foil.
  • Page 18 Page 16 -------- ----------------_...--I~ Mount the battery holder with two 3-48 x 1/4" screws, two #3lockwashers, and two 3-48 nuts as shown. Use the plastic nut starter to hold and start 3-48 and 6-32 nuts. SW3/SW4: Push the 2-section switch (#64-62) firmly down onto the circuit board as shown.
  • Page 19 Page 17 ----------------- CONTIN UEQ START. NOTE: Before you install an electrolytic capacitor, note the position of the identified (+ NOTE: As you install each component in this or -) lead, Be sure you connect the positive ( column, be sure it is fully seated onto the circuit lead to the positive marked point on the board;...
  • Page 20 Page 19 ~-------------------- (v(' Connect a 1-1/2" red wire from circuit board hole C to switch SW5lug Ref~r to Pictorial 1-7 (Illustration Booklet, Page 4) for the following steps. 1 (S-l). Position the circuit board assembly on your work area as shown in the Pictorial.
  • Page 21 In the same manner, connect the 7-1/2" brown wire from "K" on the )n the same manner, mount circuit board spacers at AD, AE, and AF. left to "K" on the right. Route the wire as shown in the Pictorial. (.;;...
  • Page 22 Page 21 ~--------------------- 6-32 3/8" SCREW (""Y""Solder bridges between foil patterns (see "Circuit Board X-Ray Views" Illustration Booklet, Pages 13 and 14). ["1 Protruding leads which could touch together. ( ) Electrolytic capacitors for the correct position of the positive ( lead.
  • Page 23 p_a_ge_22 Refer to Pictorial 2-1 (Illustration Booklet, Page 6) for the following steps. Place a soft cloth on your work area. Then place the front panel on the cloth as shown in the Pictorial. RefIJrto Detail 2-1A for the next three steps. M2: Locate the forward (FWD) power meter (#407-741).
  • Page 24 Page 23 ~HfJl--------------------------------------------------- Place a control lockwasher on circuit board control with switch (V)/Position the circuit board-front panel assembly into the cabinet bot- R1/SW5. Push the control shaft through the front panel as shown in tom as shown. Loosely secure the front panel bottom edge to the the Pictorial and secure it with a control flat washer and a control nut.
  • Page 25 _pa_ge_24 ( ) Push the knob bushing onto the end of the front panel control. Tl the control fully counterclockwise until it clicks off. With the kI! pointer at the 7 o'clock position, push the knob firmly onto the kI! bushing in the manner shown.
  • Page 26 p_a_g_e_2_5 ( ) Check the REF and FWD meters to make sure each meter pointer is Referto Pictorials 3-1 and 3-2 (Illustration Booklet, Page 8) for the following exactly over the meter scale zero ("0"). If either one is not, adjust the steps.
  • Page 27 ( ) As you observe the FWD meter, turn FWD NULL control R14 (on STARTER circuit board) in either direction to exactly zero the pointer. NOTE: In the following steps that call for adjustments using transmittJ power, your transmitter should ideally put out a CW level of at lea loo-watts.
  • Page 28 Page 27 ~-------------------- two steps until the meter indication is the same for both switch positions. On the remote sensor assembly, connect the transmitter output to the OUT coaxial jack and the dummy load cable to the IN coaxial jack. DUMMY Tune the transmitter to produce a high-scale REF meter reading.
  • Page 29 _p_a_ge_2_8 NOTE: Perform the next step only if you are going to mount the remote sensor assembly away from the meter assembly. NOTE:Disregard the following steps if you have installed the remote sens ( ) Position the remote sensor as shown in the Pictorial. Remove the into the \\' attmeter Cabinet.
  • Page 30 Page 29 ~----------------------------- Refer to Pictorial 5-1 (Illustration Booklet, Page 10) for the following infor- mation. Refer to Pictorial 5-2 (Illustration Booklet, Page 11) for the following infor- The HF Dual Wattmeter was designed for amateur radio use, in the fre- mation.
  • Page 31 control (and Battery Switch) - When you wish to check the SENSITIVITY condition of the Wattmeter battery (if used - see "Wattmeter Power" in the following text), turn the SENSITIVITYcontrol fully counterclockwise until ~fany transcei\-ers do not provide the same output power in the CW m it clicks, and set the PEP-AVGswitch to PEP (in).
  • Page 32 =ansceiver nor the Wattmeter are malfunctioning. both. We recommend an alkaline power cell, NEDAType #1604 for battery power, and you may purchase the optional 9-volt Heathkit Converter Model GRA-43-1 if you want to power the Wattmeter without a battery or if you wish to use both.
  • Page 33 that they are soldered as described in the "Soldering" section p- This section of the Manual is divided into two parts. This first part, titled "General," describes what to do about any difficulties that might occur Be sure the proper part has been wired into the circuit at right after the unit as assembled.
  • Page 34 _---------------------------pa- -e-33 The following chart lists conditions and possible causes of several specific malfunctions. If a particular part is mentioned (R23 for example) as a possible cause, check that part and other components connected to that part to see that they are installed and/or wired correctly. Also check for solder bridges and poor connections in the surrounding area.
  • Page 35 High. 0-2000 \,'atts PEP. LO\,'. 0-50 \,'atts PEP. High. 0-500 \,'atts PEP. SWR. 1:1 Accuracy (full scale) (AVG). ±50/o 200 Wand 2000 W (FWD), 500 W (REF) ±7.5% (AVG). 50 W (REF) 9-volts DC (Battery NEDA Type #1604, or optional Heathkit Converter).
  • Page 36 pa_g_e_35 wide x high x deep. 7-1/2" 4-1/8" 6-3/8" em). (19.05 10.48 16.19 The Heath Company reserves the right to discontinue products and to change specifications at any time without incurring any obligation to incorporate new features in products previously sold.
  • Page 37 Refer to the fold-in Schematic Diagram as you read the following circuit I\lPORT_\"'\l' remote sensor is factory aligned, calibrated, and is description. seale-d: ·.:c:c.,,· •..tiorize-d tampering with the remote sensor can void the War- ranty your V_-2tt:rrleter. 0:::' A bare wire connects input jack J101 to output jack J102 through toroid coil L1010 L1o1 is a current pickup...
  • Page 38 The power for the Wattmeter is taken directly from either a 9-volt NEDA divider while they maintain the equivalent resistance of meter M2 on the Type 1604 battery or from the Heathkit Converter Model GRA-43-1. When remote sensor. This preserves the calibration of the sensor. Amplifier IC only the 9-volt battery is connected to the switch circuit board, the closed U1C acts as a peak detector when combined with diode D2.
  • Page 39 voltages to the circuits of integrated circuit If the Converter is plugged \rilen be rrm::t pcnel Sensiti\'ity control is rotated fully counterclockwise into jack J1, power is taken only from the Converter Charger, the battery, if lint! be cu:J:oo: c::cks. the battery (or Converter) power, through contacts installed, is disconnected from the circuit.
  • Page 40 Page 39 -------------- IDENTIFICATION COMPONENT HEATH MANUFACTURER'S PART NO. NUMBER IMPORTANT: THE BANDED END OF DIODES 1N4149 56-56 01,02 BE MARKED IN A NUMBER OF WAYS. &Y# 0101,0102 56-20 1N295 BAN OED EN 0...
  • Page 41 HEATH MANUFACTURER'S PART NO. NUMBER...

  • Page 42: Customer Service

    CUSTOMER SERVICE TECHNICAL CONSULTATION If it is convenient, personally deliver your kit to a Heathkit Electronic Center, For warranty parts replacement, sup- Please provide complete information when you request re- Need heip with your kit? - Self-Service? - Construction?- ply a copy of the invoice or sales slip.

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