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Daniels VT-3H040 Instruction Manual

Vhf transmitter
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DANIELS
ELECTRONICS LTD.
MT-3 RADIO SYSTEMS
Copyright © 1997 Daniels Electronics Ltd. All rights reserved. No part of this publication may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic,
mechanical, photocopying, recording or otherwise, without the prior written consent of Daniels
Electronics Ltd.
Issue:
1
Issue Date:
May 97
Printing Date:
Sept 97
Part No.:
IM20-VT3040
VHF TRANSMITTER
INSTRUCTION MANUAL
29 - 50 MHz
Covers model: VT-3H035-SWA3, VT-3H045-SWA3
Previous Issue:
Previous Issue Date: N/A
VT-3
N/A
®
Daniels Electronics Ltd.
Victoria, B.C.
PRINTED IN CANADA

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Summary of Contents for Daniels VT-3H040

  • Page 1 29 - 50 MHz Covers model: VT-3H035-SWA3, VT-3H045-SWA3 Copyright © 1997 Daniels Electronics Ltd. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written consent of Daniels Electronics Ltd.
  • Page 2 GENERAL Introduction The VT-3H040 transmitter is a low power, synthesized FM transmitter capable of operating in 20 kHz or 25 kHz channels and within one of two bands: 29 MHz to 38 MHz or 38 MHz to 50 MHz. The transmitter is rated for continuous duty at an RF output power of 3.0 Watt. The RF output power level is preset at the factory.
  • Page 3 (see section 2.1). VT-3H040 Transmitter Family Models The VT-3H040 line of transmitters has a single RF power output rating of 3.0 Watt, with wide band FM (20 kHz or 25 kHz channels) and employs synthesizer based frequency generation. The two basic (i.e.
  • Page 4 Performance Specifications 1.4.1 General The following is a general set of specifications for the generic VT-3H040 transmitter. Additional specifications, specific to individual modules may be found in their respective submanuals. Type: MT-3 Series Transmitter Family: VT-3H040 Compatibility: MT-2 Series and MT-3 Series Radio Systems Frequency Range: 29.0 MHz to 50.0 MHz...
  • Page 5 Front Panel switch: KEY TX - without time-out timer; NORM - with or without time-out-timer; Isolated (optional relay) with or without time-out timer. PTT Time Out Timer: Selectable from 1 sec. to 8 hrs. (factory set 5 min.). DANIELS ELECTRONICS VT-3H040 VHF Enhanced Transmitter Instruction Manual...
  • Page 6 Less than 2.5% THD; 1 kHz tone at 1.5 kHz or 3 kHz deviation (-40°C to +60°C). Hum and Noise: Better than 55 dB (test receiver band limited: 400 Hz to 30 kHz). DANIELS ELECTRONICS VT-3H040 VHF Enhanced Transmitter Instruction Manual...
  • Page 7 2 and 4 layer printed circuitboards. Gold plated module connectors. Module Design: Compact Eurostandard modular design. Plug-in modules mate with Daniels standard M3 repeater subrack. Subracks / modules comply with IEEE 1101, DIN 41494 and IEC 297-3 (mechanical size / modular arrangement).

  • Page 8: System Overview

    Transmitter Main Board Manual. The VT-3H040 transmitter requires two power supplies; a regulated +9.5 Vdc supply and a +13.8 Vdc supply, the latter of which is connected only to the Amplifier Module. The (nominally) +13.8 Vdc supply's range is +11 Vdc to +16 Vdc.
  • Page 9 Amplifier module and for this reason, it is important that the four screws that bond the shell to the amplifier module (Screws B in Section (3-2)) be installed before prolonged operation of the DANIELS ELECTRONICS VT-3H040 VHF Enhanced Transmitter Instruction Manual...
  • Page 10 Note: It is advisable to confirm these frequency ranges with the individual module manuals, notably the amplifier and synthesizer, as they are subject to change with updated versions. The values in the module manuals take precedent over those tabulated (following page). DANIELS ELECTRONICS VT-3H040 VHF Enhanced Transmitter Instruction Manual...
  • Page 11 'Output Power Adjustment' which is described in the Amplifier Manual can be adjusted accordingly. If the Synthesizer module is replaced, it is strongly recommended that the amplifer undergo a realignment as described in the Amplifier Module, DANIELS ELECTRONICS VT-3H040 VHF Enhanced Transmitter Instruction Manual...
  • Page 12 The transmitter maximum deviation range is set by jumpers at the factory to ± 5.0 kHz for the VT-3H040 transmitter. However, under some conditions such as a large change in transmitter operating frequency, the deviation control may need adjustment. The transmitter deviation is dependent on the operating frequency and this dependency is likely to be more severe at the band edges.
  • Page 13 For example: • PCB number 43-912010 indicates circuitboard version 1.0; • PCB number 50002-02 indicates circuitboard version 2.0. All PCB's manufactured by Daniels Electronics are identified by one of the above conventions. DANIELS ELECTRONICS VT-3H040 VHF Enhanced Transmitter Instruction Manual...