The information given in this document is not to be communicated either directly or

indirectly, to the Press or to any other person

not holding an official position in His Majesty's Service






No. 19 Mark III

Published by the Director, Communications and Electrical Design, MGO Branch, Department of National Defence, Ottawa, Canada. 

Approved by the Chief of the General Staff, Department of National Defence, Ottawa. 



This area consists of a scan of the entire Working Instructions for the Canadian WS#19 Mark III.  Simply click on the thumbnail to see a larger photo.

Some of the pages are larger files than others, meaning it will take longer for them to load.  I apologize to dial-up internet users (having been one myself until recently) but I have made every effort to make the files as small as possible without making them impossible or difficult to read.  

While it would have been great for you, the viewer, had the Mk III Working Instructions been re-typed by hand, as was the case for the Mk II, the simple fact of time and labour no longer makes that possible.

It is appreciated that some scans, because they of necessity have been turned sideways, might cause some challenges in reading.  However, in those cases it is suggested that you save that file to your own disk or hard drive and then open it using your computer's "Image Viewer".  That utility will allow you to rotate the page for normal reading.  It will also allow you to zoom in on the page, making it larger.  How? When viewing your file directory, right click on the file name, place your cursor over "Open With" (click it if necessary) then when the menu appears click on (open) "Image Viewer", at least that's the way it works for me when using Microsoft stuff.

We hope to add more actual photographs of the Mk III, for technical assistance, as time goes by.  If anyone reading this has such photos to contribute, we would be most happy to receive them for consideration to posting here. Credit will be given. The same goes for any modifications, schematics, etc, which might be helpful to those who are delving into the wonders of this fantastic radio.  I say "fantastic" because in truth the 19 was years ahead of its time.  For example, just look at how much longer it took for Amateur Radio to adopt the transceiver model.

Errors or problems in opening any thumbnail, other than download time for dial-up, or in any text on this page, should be reported to ve3bdb (at) sympatico.  Please provide full details.  Be sure to replace the "(at)" with the symbol @ when addressing the email.  



As a general guide to what's where, following is a brief overview of what to expect in the scans, according to Chapter, Appendix, Table, Photo and Fig.  For a detailed description of contents, reading the "Contents" scans will be of great assistance as each scan  includes the actual page number(s).  Note that where a page number seems to be missing it's because that page is left blank in the actual manual -- i.e. pages 2, 110, 116 and 118 are blank and unnumbered but are counted in the total number of pages.  Where a page number seems to be repeated in the scans it's simply because that page contains two different categories of information and thus overlap. Page 1 was not scanned but its contents are reprinted in red and blue at the top of this page, including the wartime "Not to be Published" admonition..


Title                                                          Summary of Contents

Cover:    self explanatory

Contents Pages 1 to 6 inclusive:    self explanatory

Chapter I:     Introduction to the manual as well as on overview of the set's "special features" improvements over the Mk II, including supply unit, slow motion drive, netting switch, separate A, B and IC switches, AVC switch, RF gain control and frequency adjustment.

Chapter II:    Description of the Mk III, including weights, A & B sets and the IC, aerials, supply unit, Table II, control units and boxes, remote control and a WARNING .

Chapter III:    Operating instructions, Fig. 1 "What are all the knobs for?" and how to use them all, Fig 2 "Netting Drill for A Set", rolling up the water proof cover, Quench adjustment, etc.

Chapter IV:    Maintenance, including operator's maintenance, daily maintenance, changing fuses, changing A set aerial pig tail, removing the grill (brush guard), weekly maintenance, aerial maintenance, Table 3 "Running Repairs", etc.

Appendix I:    Technical Description, including circuit arrangements, flick mechanism, A set receiver and its RF amplifier, frequency changer, 1st IF stage, 2nd IF stage, detector, AVC and output stage, BFO; also A set sender and its master oscillator stage, sender frequency changer, buffer stage (RF amplifier), power amplifier stage, modulation; also B set circuit arrangements and B set receiver's detector stage, 1st AF amplifier, 2nd AF amplifier (output stage); also B set sender's modulation amplifier, modulator, oscillator, send/receive switching; also intercommunication amplifier and Table 6 of valves; also A set rod aerials and horizontal aerials and Table 7 of horizontal , aerial lengths, A set aerial circuit, B set aerial; also Supply Unit No. 1; also audio equipment (microphone and receiver headgear Nos. 1 and 2.

Appendix II:    Adapting a Mk I or Mk II to use Supply Unit #2, wiring changes and a WARNING.

Appendix III:    Control units and junction distribution boxes, including extensive information about all of those items, which number nineteen of the former and four of the latter! (How the heck did they ever keep track of them all??)

Appendix IV:    Electrician's Maintenance, including aerials, variometer, aerial leads, supply unit, "set" mechanism, controls, valves, cleaning; also harnesses for control units, connectors, headsets, key; also operation including meter and "set" test; also valve tests, Tables 8, 9, 10 and 11 which all concern optimum readings for A and B set sender and receiver, sender/receiver alignment and calibration, suppression and screening, resistance analysis.

Appendix V:    Main Differences between the WS#19 Canadian MK III and the WS#19 MK III of British manufacture, including frequency adjust, AVC, heterodyne oscillator, output stage, meter transformer circuit in variometer, CW tone filter, Supply Unit, etc.

Table XII:     Components parts list, including resistors, capacitors, sockets, key, rectifier, fuses, lamps, inductances, transformers, switches, plugs, jack, valves.

Table XIII:    Set kit for WS#19 (Canadian) Mark III, a list of individual components in the set, needed to make it operate.

Table XIV:    Normal meter readings.

Table XV:    Tests for daily maintenance.

Table XVI:    Progressive resistance analysis. 

Table XVII:    Sample maintenance log.

Photo 1:    Front view of the WS#19 Mk III Canadian and the Supply Unit.

Photo 2:    Inside view of the variometer.

RAM & Photo 3:    Index to installation kit Cruiser Tank RAM I & II; Photo layout of installation equipment for RAM II.

Install & Photo 4:    Index to installation kit Trucks, Ground & Training; Photo layout of installation kit for Ground Truck Station.

Figure 3:    Block diagram of Sender/Receiver (both A and B set)..

Figure 4:    Schematic of "A" Set.





MK3CVR.JPG (43718 bytes)         MK3IND1.JPG (56301 bytes)          MK3IND2.JPG (81909 bytes)          MK3IND3.JPG (87994 bytes)          MK3IND4.JPG (87159 bytes)

 Cover                                    Contents Page 1                     Contents Page 2                    Contents Page 3                     Contents Page 4


 MK3IND5.JPG (67280 bytes)          MK3IND6.JPG (64298 bytes)          MK3P9.JPG (66588 bytes)          M3P10-11.JPG (101740 bytes)          M3P12-13.JPG (127853 bytes)          Contents Page 5                Contents Page 6                   Chap I, Page 9                  Chap I, Pgs 10-11                Chap II, Pgs 12-13



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Chap II, Pgs 14-15                Chap  I, Pgs 16-17               Chap II Pg 18 Chap III Pg 19        Chap III Pgs 20-21            Chap III Pgs 22-23


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Chap III Pgs 24-25                Chap III Pgs 26-27                Chap III Pgs 28-29                Chap III Pgs 30-31                Chap III Pgs 32-33


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Chap III P 34 Chap IV Pg 35     Chap IV Pgs 36-37             Chap IV Pgs 38-39            Chap IV Pgs 40-41


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Append. I Pgs 42-43           Append. I Pgs 44-45            Append. I Pgs 46-47            Append. I Pgs 48-49          Append. I Pgs 50-51


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Append. I Pgs 52-53           Ap. I Pg 54 Ap. II Pg 55      Ap. II Pg 56 Ap. III Pg 57       Append. III Pgs 58-59      Append. III Pgs 60-61


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Append. III Pgs 62-63        Append. IV Pgs 64-65       Append. IV Pgs 66-67       Append. IV Pgs 68-69         Append. IV Pgs 70-71


M3P72-73.JPG (109815 bytes)              M3P74.JPG (36894 bytes)          M3T12RS.JPG (52394 bytes)          M3T12RS2.JPG (107852 bytes)          M3T12RS3.JPG (104460 bytes)

Ap. IV Pg 72 Ap. V Pg 73      Append. V Pg 74                  Table XII Pg 75                  Table XII Pgs 76-77           Table XII Pgs 78-79


M3T12RS4.JPG (44971 bytes)            M3T12CP.JPG (55757 bytes)            M3T12CP2.JPG (116956 bytes)            M3T12CP3.JPG (115581 bytes)                            

Table XII Pg 80                     Table XII Pg 81                     Table XII Pgs 82-83              Table XII Pgs 84-85


M3T12CP4.JPG (21828 bytes)          M3T12SK.JPG (45217 bytes)          M3T12LP.JPG (11886 bytes)          M3T12IN.JPG (81920 bytes)          M3T12IN2.JPG (45230 bytes)

Table XII Pg 86                   Table XII Pg 87                 Table XII Pg 88 Lamps      Table XII Pgs 88-89          Table XII Pg 90


M3T12SW.JPG (47976 bytes)          M3T12SW2.JPG (42867 bytes)          M3T12VL.JPG (43403 bytes)          M3T13ST.JPG (91228 bytes)          M3T13ST2.JPG (94725 bytes)

Table XII Pg 91                    Table XII Pg 92                 Table XII Pg 93                   Table XIII Pgs 94-95        Table XIII Pgs 96-97


M3T13ST3.JPG (52604 bytes)        M3T14MR.JPG (56954 bytes)        M3T15DM.JPG (122681 bytes)        M3T15DM2.JPG (108818 bytes)        M3T16PR.JPG (116960 bytes)

Table XIII Pg 98               Table XIV Pg 99           Table XV Pgs 100-01     Table XV Pgs 102-03       Table XVI Pgs 104-05


M3T16PR2.JPG (81914 bytes)        M3T17ML.JPG (73602 bytes)        M3PHP109.JPG (33628 bytes)        M3VAR111.JPG (41322 bytes)             M3RAM.JPG (71811 bytes)      

Table XVI Pgs 106-07    Table XVII Pg 108           Photo 1 Page 109           Photo 2 Page 111          RAM & Photo 3 Pgs 112-13


  M3INSTAL.JPG (114460 bytes)                         M3FIG3.JPG (47100 bytes)                 MK3SCH.JPG (185646 bytes)

Install & Photo 4 Pgs 114-15                Fig. 3 Page 117                             Fig. 4 Page 119


                                                                    Schematic of PSU

                                                                    Fig. 7 Page 125








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Copyright R. D. (Bob) Cooke, VE3BDB (Orillia, Ontario, CANADA). All Rights Reserved