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    Wireless For The Warrior, Various Series No. 4, Philips DR 30

    Uploaded by

    Louis Meulstee
    The "WftW Various" series comprises articles on topics not directly within the original scope of WftW. In WftW Various No. 4, there is a description of the Philips DR 30, a pre-war military short-wave transceiver.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Wireless For The Warrior, Various Series No. 4, Philips DR 30

    Uploaded by

    Louis Meulstee
    42 views5 pages
    The "WftW Various" series comprises articles on topics not directly within the original scope of WftW. In WftW Various No. 4, there is a description of the Philips DR 30, a pre-war military short-wave transceiver.

    Original Title

    Wireless for the Warrior, Various Series No. 4, Philips DR 30

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    © © All Rights Reserved

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    PDF, TXT or read online from Scribd

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    The "WftW Various" series comprises articles on topics not directly within the original scope of WftW. In WftW Various No. 4, there is a description of the Philips DR 30, a pre-war military short-wave transceiver.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    42 views5 pages

    Wireless For The Warrior, Various Series No. 4, Philips DR 30

    Uploaded by

    Louis Meulstee
    The "WftW Various" series comprises articles on topics not directly within the original scope of WftW. In WftW Various No. 4, there is a description of the Philips DR 30, a pre-war military short-wave transceiver.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 5

    By Louis Meulstee (editor)

    The 'Various' Series


    No. 4 Philips DR 30.
    Cover and layout: Louis Meulstee.
    Cover illustration: Philips DR 30 Portable transmitter/receiver

    The cover artwork and layout of this WftW 'Various' series article was prepared with DTP
    Serif PagePlus X6, using Arial, AvantGarde, Helvetica and Poppl-Laudatio fonts. Scanned
    illustrations and photos were enhanced and prepared with Adobe Photoshop Elements.
    The finished publication was directly converted into PDF format.

    - First published 2023, Version 1.00, as a free to download print ready publication.
    - This unchanged edition was adapted for Scribd™ in 2023 with the addition of a front
    cover and colophon.

    © Louis Meulstee PA0PCR


    Ottersum
    The Netherlands
    info@wftw.nl
    http://www.wftw.nl

    About this publication.


    Selected articles, previously published on the Wireless for the Warrior website, have now
    been added to 'Scribd™' for the interest of a broader audience.

    The Various Series.


    The Wireless for the Warrior ‘Various’ series is a range of articles on topics not directly
    related, but within the scope of the WftW website and interest. These can be freely copied
    and distributed, but only in their current form, preferably with mention of the website
    www.wftw.nl.
    Please note that the page layout of the WftW series was setup with mirrored pages, primarily
    intended for double sided (colour) printing, preferably on good quality class A paper.

    Dec. 2023
    Wireless for the Warrior - ‘Various’ series No. 4 DR 30 - 1
    Philips DR 30
    Date of issue: July 2023.
    After publishing over 340 Wireless for the Warrior ‘Supplements’, the amount of source material gradually dried up. Not directly related
    material, but within the scope of the WFTW website and interest, will be published in a new range entitled the ‘Various Series’.

    DR 30
    Country of origin:
    Holland

    REMARKS
    DR 30 (DR, short of Draagbare Radio = Portable Radio) was a portable
    (man pack) transmitter-receiver developed by Philips Eindhoven, built
    by NSF (Nederlandsche Seintoestellen Fabriek) in Hilversum.
    Not much is known of the DR 30, the only source found to date was in
    a 1939 Philips sales brochure. It is not believed that many DR 30s were
    sold. Two are currently in the Military Museum at Hämeenlinna in
    Finland, having serial numbers 105 and 108, probably the only two
    which survived. It might be speculated that these were from a trial or
    pre-production run, particularly when looking at the two sheets in the
    upper front cover plate compared to a photo printed in the 1939 sales
    brochure.

    The DR 30 operated on shortwave and could be tuned to a single


    frequency between 3-5MHz. Both receiver and transmitter were tuned
    automatically on the same frequency. Minor deviations in the receiver
    tuning could be adjusted by a corrector control knob. The tuning
    control was coupled to the tuning scale assembly with numbers, be-
    lieved to be calibrated in frequency (or wavelength?) in a curve printed
    on a card.

    The receiver was a conventional superheterodyne with RF stage,


    oscillator/mixer, one IF stage, detector/BFO and AF output stage. The
    transmitter had two stages: A KF3 master oscillator and KL2 RF output
    DATA SUMMARY valve. All valves were ‘K’ series battery types.
    The mechanical construction comprised a light alloy frame with front
    Organisation: Philips Eindhoven, Holland. panel on which were fitted two assemblies, with the tuning capacitor
    Manufacturer: NSF, Hilversum. Holland. and tuning scale assembly in the centre.
    Year of Introduction: 1939. The transmitter-receiver unit slid into the top compartment of the
    Purpose: Portable HF transmitter-receiver. plywood and aluminium carrying case, the accessories stowed in a
    drawer in the centre, and batteries in the bottom. Ten aerial rod sections
    Receiver: slid in a compartment of the bottom protective front panel.
    Circuit features: Superheterodyne with RF stage,
    mixer/local oscillator, IF, Det/BFO and AF output. Other currently known radios in the Philips DR series were DR 24, DR
    Frequency coverage: 60-100M (5-3MHz). 25, DR 32, DR 38, DR 42 and DR 78. Of the DR 38 (and stationary
    IF: Not yet known. version FR 38) about 200 were built for the Dutch PTT in 1938/9.
    Transmitter:
    Circuit features: Local oscillator, RF power amplifier.
    60-100M (5-3MHz); CW and AM voice. References
    RF output: 1W (AM voice), 2W (CW). - I am indebted to Kari Syrjänen for attending me to the DR 30,
    Valves: KF3 (4x), KC1 (2x), KK1, KL2. and taking photographs of the two radios in the Military Museum.
    Aerial: Sectional rod aerial. - Philips sales brochure of communication equipment, issued 1939.
    - With thanks to the Finnish sotilasradiomuseo (Military Radio
    Power supply: Dry batteries. 3V LT, 150V HT, -18V GB.
    Museum). Website https://putkiradiomuseo.fi/sotilasradiomuseo/
    Accessories: Headphones, micro-telephone, Morse key, - With thanks to the Military Museum at Hämeenlinna in
    10 rod aerial sections, HT, LT and GB batteries. Finland. See their interesting website: https://museomilitaria.fi.

    © This WftW Various series essay is a download from www.wftw.nl. It may be freely copied and distributed, but only in the current form.

    Page 1 of 3. WftW ‘Various’ Series No. 4. ver 1.00. Jun. 2023.


    Wireless for the Warrior - ‘Various’ series No. 4 DR 30 - 2

    Condensed working instructions in


    the German language, and layout
    of main components and valves,
    printed on two sheets fitted behind
    a transparent celluloid overlay.

    Illustration in the Philips sales


    brochure showing the two
    sheets and the clock which is
    missing from the two sets in
    the Finnish Military Museum
    (left).

    Another illustration taken


    from the Philips sales
    brochure (right).

    HT test button
    Tuning scale
    Test meter
    Aerial tuning
    control

    Tuning control
    LT test button

    Clock AF gain control


    (missing)

    Mic-tel/Morse key sockets Earth terminal Tuning lock Freq. correction System switch
    control

    Functions of controls Philips DR 30 transceiver.


    © This WftW Various series essay is a download from www.wftw.nl. It may be freely copied and distributed, but only in the current form.

    Page 2 of 3. WftW ‘Various’ Series No. 4. ver 1.00. Jun. 2023.


    Wireless for the Warrior - ‘Various’ series No. 4 DR 30 - 3

    View of the backside showing the two assemblies, and


    Bottom view showing in the lower-centre a 5-point
    in the centre the tuning condenser, fitted in a light alloy
    socket corresponding with a 5-pin plug fitted in the
    cast frame.
    set case, connecting to the batteries.

    Morse key believed to be


    issued with the DR 30.

    Top view of the DR 30 showing transmitter RF output


    stage left and fuses in a separate compartment.

    Internal views of the DR 30. Most of the valves were in screened cans.

    KF3 KF3
    KF3 KK2 KF3

    Right hand assembly with transmitter and receiver RF Left hand assembly with receiver IF, detector/bfo and
    and mixer stages. AF stages.

    © This WftW Various series essay is a download from www.wftw.nl. It may be freely copied and distributed, but only in the current form.

    Page 3 of 3. WftW ‘Various’ Series No. 4. ver 1.00. Jun. 2023.

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