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SMC Networks HF-150 Operating Manual

Communications receiver
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OPERATING
MANUAL
South Midlands
Communications Ltd
1

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Summary of Contents for SMC Networks HF-150

  • Page 1 OPERATING MANUAL South Midlands Communications Ltd...
  • Page 2 HF-150 ADD ON ACCESSORIES PR-150 For add selectivity and rejection of unwanted signals AP-150 Digital Audio Processor for enhanced audio output KPAD-2 Keypad for ease of remote access to frequency and mode selection IF-150 Computer RS232 Serial interface for ease of control...

  • Page 3: Table Of Contents

    HF-150 - Users Manual Contents Introduction ....4 Getting started Aerials ....5 Active Antenna .

  • Page 4: Introduction

    As our founder once remarked, "Some receivers are rather like a chocolate eclair; Wonderful to behold but containing little of substance." The design and development of the HF-150 was based on straightforward objectives:- To obtain sufficient RF performance for the receiver to operate in crowded short wave bands with many strong signals.

  • Page 5: Aerials

    HF-150 - Users Manual Aerials and Earths. Operating the HF-150 is described in the next two sections of this manual, but you may well ask "What is a suitable aerial?" The receiver has been designed to work well with a simple long wire aerial, about 10 to 30 metres long. This will...
  • Page 6 HF-150 - Users Manual The Long wire Aerial. This is the simplest type of outdoor aerial system, and is very effective for general short-wave listening. It consists of a single, insulated wire erected with a horizontal top section and a down lead from one end going to the receiver's wire aerial input terminal.

  • Page 7: Active Antenna

    HF-150 - Users Manual HF-150 MARINE RADIO IMPORTANT If you have purchased the Marine Radio version of the HF-150 you should be aware of the following. The HF-150 is sent out for normal passive aerial use. You can use this radio with an active aerial, which will require a 12V DC supply at the aerial socket.

  • Page 8: Connections

    OFF before plugging in or unplugging the power connector. In most countries, the HF-150 will be supplied with a small 12 volt regulated power unit which is designed to operate from the local mains power. Remember that this supply will be operating all the time that it is connected to the mains outlet, and it is a wise safety precaution to disconnect it from the mains supply when the receiver is not in use.
  • Page 9 HF-150 - Users Manual External Loudspeaker. A small internal loudspeaker is provided in the HF-150 so that it is self contained, but although it can provide reasonable all round audio quality, clearly in the limited space available compromise has to be made. You will find that if the volume control is set to a high level there may be some audio feedback caused by vibration induced by the internal loudspeaker.

  • Page 10: Types Of Signal

    HF-150 - Users Manual Types of Signal. The HF-150 is equipped to receive most types of transmission likely to be found within its tuning range, and although most users will be familiar with these, here are some brief notes on this topic that may be useful to beginners.
  • Page 11 50Hz either way will not be serious. The HF-150 has a very slow tune rate on its SSB modes to facilitate accurate tuning, but you will need a steady hand.
  • Page 12 FM transmissions in the HF spectrum are usually limited to the 27MHz Citizens Band and the 28MHz amateur band. The HF-150 does not offer an FM mode to directly receive these signals, but it is usually possible to resolve them in AM mode with the receiver off-tuned by some 3kHz above or below the transmission frequency.
  • Page 13 The improvement in intelligibility is often dramatic, and it is well worth trying out ECSS and developing the ability to use it. The HF-150 when used with its USB or LSB modes is ideally suited to ECSS reception.

  • Page 14: Front Panel

    HF-150 - Users Manual Front Panel Controls. HF-150 COMMUNICATIONS RECEIVER 12.095 VOLUME ON OFF PHONES MODE FAST Memory mode flag: This segment of the display is shown when the receiver is in memory mode. The keypad and tuning knob select memory numbers, and the three control buttons operate as MEMORY, RECALL and STORE.
  • Page 15 HF-150 - Users Manual Volume control: Combined with the on/off switch, the volume control operates for the internal and external loudspeakers and the headphone output. The record out jack is unaffected by the volume setting. The on/off switch controls receiver power and battery charging if NiCd batteries are fitted.

  • Page 16: Rear Panel

    Rear Panel Controls and Connections. HF-150 Battery holders: The HF-150 needs a total of eight AA size batteries to operate - 4 cells in each of the two battery holders. The Battery drawers are released by squeezing together the lugs on either side of the holder. When replacing a drawer make sure that it is pressed fully in so that the cells are suitable, but all eight cells must be of the same type.
  • Page 17 HF-150 - Users Manual Aerial select switch: This three-position switch controls the operation of the whip aerial amplifier and the RF attenuator. In the WHIP position the SO-239 socket (11) is intended for a whip aerial or a short wire (just a few metres) and the spring terminal (13) is disconnected.

  • Page 18: Volume

    If rechargeable batteries are fitted to the HF-150 then they will charge if power is supplied to the receiver when it is switched off. The batteries will fully charge in about 16 hours from a completely discharged condition.

  • Page 19: Tuning

    LSb < - Usb < - A < - An < - ASd < - ASF < - ASL < - ASu < - LSB Tuning. The HF-150 is tuned with a single rotary control (which drives a digital shaft encoder) giving continuous tuning over the whole of the receiver's range. There...
  • Page 20 HF-150 - Users Manual The tuning rates adopted by the HF-150 are shown in the table below: - Mode Normal tune rate Fast tune rate Tuning step kHz per rev LSB, USB 8 times faster AM, AMn 60Hz 6 times faster...

  • Page 21: Keypad

    It is connected by a short cable which should be plugged into the KEYPAD jack on the rear panel of the HF-150. The keypad has 12 keys - the digits [0] to [9], the [#] key (enter), and the [*] key (cancel). As keys are pressed the digits are shown on the receiver's frequency display.
  • Page 22 Frequencies of 2999KHz and below are selected with the ‘#’ key as the last digit. HF-150 users may also access the different modes in any order by holding down the ‘ ’ key and then using any of the numbers 1-8 as indicated by the keypad diagram below.

  • Page 23: Aerial Switch

    HF-150 - Users Manual Because frequencies entered by the keypad are to the nearest kilohertz, it may be necessary to retune the receiver slightly to correctly resolve single sideband signals or when using the receiver in AMS mode. If you press an incorrect key on the keypad, the current digits can be cleared by pressing the cancel key [*], after which the frequency should be re-entered.

  • Page 24: Memories

    HF-150 - Users Manual Memories. The HF-150 has 60 memories which can store receiver frequency and mode settings. Memory information is saved in an EEPROM device within the receiver which needs no power to retain its information. There are three memory...

  • Page 25: Accessory Kit

    2.5mm Hexagon wrench. Fitting the Handles. The metal handle brackets fasten to the HF-150 using the main panel fixing screws at the front and back of the receiver. The supplied hexagon wrench can be used to undo and replace these screws.

  • Page 26: Care Of Your Receiver

    The likely result will be tears of distress and a big repair bill. The HF-150 is powered by 12 Volts DC, negative ground only. BE CAREFUL when applying power from any source other than the power unit provided with the receiver.

  • Page 27: General Notes

    When tuning the HF-150 you will notice that the output will be muted for about half a second as you tune through the local oscillator range switching frequency at 11.576MHz.

  • Page 28: Technical Information

    HF-150 - Users Manual Technical Information. Specification. Frequency coverage 30kHz or 150kHz to 30MHz continuous coverage. (depending on region) Reception modes LSB, USB, AM, Synchronous AM (USB, LSB, DSB) Receiver system Microprocessor controlled PLL tuning, dual conversion superheterodyne receiver. First IF 44.999MHz to 45.000MHz, second IF 455kHZ.
  • Page 29 HF-150 - Users Manual Power supply 12V DC supply @ 130 to 300mA (2.1mm power jack). 240V AC Mains powered unit supplied as standard. Internal batteries - 8 AA-size cells. (Charging circuit included for NiCd cells). Dimensions Size 185 x 80 x 175mm (WxHxD, overall).
  • Page 30 HF-150 a high dynamic range and good resistance to strong signal overload. A crystal filter with a 15kHz bandwidth in the first IF (at 45MHz) limits the signals fed to the second mixer and removes image responses from the second IF.
  • Page 31 HF-150 - Users Manual The receiver uses ceramic multi-element filters in this IF - a total of three filters giving very good skirt selectivity. At the end of the second IF, a full-wave envelope detector serves as a low-distortion AM detector and an AGC source.

  • Page 32: Main Unit

    HF-150 - Users Manual HF-150 MAIN UNIT RF and IF SECTION MC3357P J310 BC183L BC183L Q28-31 Q20,21 SL6700CDP Q22,23 SL6440CDP KEYPAD ZTX320 MI204 TDA1904 100n IN4148 74HC02 D18-28 220K ANTENNA L11 270n L9 270n L10 270n C51 10n R65 4K7...
  • Page 33 HF-150 - Users Manual REC OUT RM1 10K AUDIO AMP EXT MUTE BC212L MUTE OPTION R92 220 PHONES 4.7u R93 220 C87 470u BIAS C81 10u 9-16 100n INT LS R87 220K 2.2u EXT LS 470K VOLUME AF SWITCH R94 22K...
  • Page 34 HF-150 - Users Manual...
  • Page 35 HF-150 - Users Manual...
  • Page 36 South Midlands Communications Ltd S.M.House School Close Chandlers Ford Ind Est. Eastleigh Hampshire SO53 4BY Tel: +44 (0)23 8024 6200 Fax:+44 (0)23 8024 6206 Email: sales@smc-comms.com...

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