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ELAD FDM77 Operating Manual

Hf receiver, all mode sdr receiver 10 khz-65 mhz
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E L A D
A ppar ecch i atu r e elettr on i ch e pr ofes s i on al i
P r ofes s i on al el ectr on i c devi ces
All Mode SDR Receiver
10 KHz ~ 65 MHz
Operating Manual

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Summary of Contents for ELAD FDM77

  • Page 1 E L A D A ppar ecch i atu r e elettr on i ch e pr ofes s i on al i P r ofes s i on al el ectr on i c devi ces All Mode SDR Receiver 10 KHz ~ 65 MHz Operating Manual...

  • Page 2: Table Of Contents

    Page Index 1 Overview. 1.1 Introduction 1.2 Configuration 1.3 Front & Rear Panel 1.4 Installation and Power Supply 1.5 Accessories 1.6 Controls and Functions 2 Operation of the Receiver – Basic 2.1 Switching on the FDM – 77 2.2 Selection of the front-end input set-up. 2.3 Frequency selection 2.4 Tuning Steps 2.5 Mode Selection...

  • Page 3: Overview

    The FDM-77 is conceived as a SDR ( Software Defined Radio). This approach means that the receiving set is composed of a Hardware RF front-end and a PC with an ELAD Software Radio. The Software Radio is the operator’s main interface (GUI) for the control of the radio (Input, Tuning, Setup, Mode, Display and AF ) and is also used to decode and reproduce the audio through the PC soundcard.
  • Page 4 The FDM-77 set includes : • RF front-end ( The Gray box on the right side) • ELAD software radio ( CD ROM) • Power supply ( The black box on the left side) • Audio cable • USB cable...

  • Page 5: Front & Rear Panel

    1.3 Front & Rear Panel The front panel of the Hardware RF front-end includes: • A POWER ON LED • A MONITOR LED to show the communication established between the Hardware RF front-end and the PC. • A 7 LEDs BAR to show the presence and relevant strength of a signal at the input of the receiver. The rear panel includes: •...
  • Page 6 During the first installation the FDM77 HF RX must be switched off or alternatively the USB cable disconnected from the PC. At the end of the installation of the FDM77- ELAD Software Radio also the USB driver must be installed.

  • Page 7: Accessories

    1.5 Accessories Your FDM-77 is supplied complete of the following accessories: • A mini 1/8” 3.5mm stereo plug male to male cable ( L = 2m). • A MH USB 2.0 cable A to B (L = 1.8m) • A 230 V AC / 12 V DC power supply Optional accessories: •...

  • Page 8: Controls And Functions

    1.5 Controls and Functions 1.5.1 Graphical user Interface (GUI). Main screen The screen shot below shows the main screen (the cockpit) of the Graphical User Interface : In the upper left side there is a window dedicated to: display the operating frequency, mode ( CW, LSB, USB, AM, FM, DRM), VFO (variable frequency oscillator) , MEM and CH to select the operating frequency .

  • Page 9: Operation Of The Receiver - Basic

    2 Operation of the Receiver – Basic 2.1 Switching on/off the FDM – 77 Insert the 12V DC plug cable into the DC socket and push on/off the switch on the rear panel of the radio. Power on will be indicated also through the “power on” led on the front panel. In order to avoid blocking of the software the following sequences must be followed.

  • Page 10: Frequency Selection

    2.3 Frequency selection There are two main modalities to choose the operating frequency: VFO and MEMORY. 2.3.1 Selection of the operating frequency through the main shuttle knob. Click the VFO button ( the VFO label is activated in the Frequency window) if you want to browse the frequency range trough the main shuttle knob as in a traditional way.

  • Page 11: Tuning Steps

    step. A shortcut for changing a single digit can be activated through the “Q”, “W”,”E”, “R”, “T”, “Y”, “U”, “I” keys (increment) and “A”, “S”,”D”, “F”, “G”, “H”, “J”, “K” (decrease). The “I” and “K” keys move 1 Hz digit and up to 10 MHz the “Q” and “A”. Note that the arrows on the PC keyboard control the frequency only if the window of the cockpit is active (i.e.

  • Page 12: Mode Selection

    If DRN Int. is selected the DRM signal is processed through the optional Channel Decoder and Audio Decoder integrated in the ELAD FDM-77 Software Radio. If DRM Ext. is selected the DRM signal is processed through the DRM software preferred by the operator.

  • Page 13: Band Selection

    2.6 Band Selection. No band selection is required to explore the whole range of frequencies. Simply select, with the VFO, Keyboard and/or Memory the desired frequency. The internal pre-selector filter will be automatically activated in the RF Hardware front-end. 3 Operation of the receiver – Advanced The set up of the RF front-end input has a strong impact on the quality of the reception.

  • Page 14: Frequency Scanning

    3.3 Frequency scanning By clicking the SCAN button the scan panel will popup . Before starting the scan Start and Stop frequencies must be selected together with the Time hold ( 200 mS is the default) , Step frequency and Step X (of the frequency axis). At the end of the scanning process a diagram with S-meter level and frequencies will be displayed.

  • Page 15: Memories

    3.4 Memories 3.4.1 Saving a station/frequency in the memory. When the desired station/frequency is tuned simply click the memory button to open the MEMORY file. Click on the “Save in Mem” Button and the data will be inserted in the table. Click Close to exit.

  • Page 16: Advanced Controls

    3.5 Advanced controls. In the TUNING window an ADV button is included. Clicking on this button a new ADVANCED window will pop-up showing the DSP function and controls. The advanced window includes: Input Spectrum, Audio Spectrum, Audio Oscilloscope, DSP Filter BW, IF SHIFT, CW MODE and AGC CONTROL.

  • Page 17: Input Spectrum

    3.5.1 Input Spectrum. A Low Frequency real time spectrum diagram is available in the upper left side of the window . In the diagram the 12 KHz signal level at the input of the soundcard is displayed in dB and the frequency in KHz.
  • Page 18 LSB signal received with 2.5 KHz BW DSP filter AM signal received with 4.0 KHz BW DSP filter...

  • Page 19: If Shift Control

    FM signal received with 5.0 KHz BW DSP filter. 3.5.3 IF Shift control. This control allow the operator to move the 455 IF band pass filter with reference to the tuned signal in order to attenuate an on band interfering signal. Display of the tuned AM signal together with a CW interfering signal.

  • Page 20: Cw Mode

    IF band pass filter shifted 500 Hz up to attenuate the CW interfering signal. 3.5.4 CW MODE In the middle right side a CW mode filter control is available with several operative mode. Mode A : This operative mode is very similar to old style radio receivers provided with the BFO control.
  • Page 21 Mode A CW demodulation using BFO for 800 Hz audible tone. Mode A CW demodulation using BFO for 1.100 Hz audible tone.

  • Page 22: Agc Operation & Control

    Mode B CW demodulation with fixed BFO and Zero beat. To hear the 800 Hz Audible tone a different VFO tuning will be required. 3.5.5 AGC Operation & Control The operator is allowed to work with Automatic AGC ( Slow or Fast) or with Manual AGC. When working with Manual AGC the gain is varied through the slide bar control.
  • Page 23 Desired signal at 1.125 HZ with two interfering tones (750 Hz and 1.500 Hz). Thanks to filter notch 1 the interfering signal at 750 Hz has been eliminated.
  • Page 24 Using the notch filters. Thanks to filter notch 2 the interfering signal at 1.500 Hz has been eliminated. Both interfering signals have been eliminated using notch 1 and 2...

  • Page 25: Audio Spectrum

    Stand Alone operation of FDM-77. (This is the normal operating condition) TCP Client/Server. This mode allow the remote control of FDM-77. The PC where ELAD software is installed can be configured as server (with the FDM77 connected) or client (as remote station).
  • Page 26 In the normal operation with FDM77 the PC sound card is used to filter and demodulate the received signals and can’t be used also to decode RTTY, HamDRM or CW with dedicated applications as CWget, MMTTY, Jfax .

  • Page 27: Af Control

    3.7 AF Control. In the lower right side of the cockpit the AF CONTROL window allow to set up the sound reproduction that best conforms the operator preferences. The AF frequency spectrum is divided in 6 octaves with high/low tone slide bar controls. Moreover volume control is added with mute control (toggle button).

  • Page 28: Remote Control Of Fdm-77

    4. Remote control of FDM-77. This function is not released so far. It consists of an option (not included in the FDM77, but available as separate option) to allow the remote control of a receiving station equipped with FDM77 (Server station) through internet (TCP/IP) simply using a PC with the ELAD Software radio installed (Client station).

  • Page 29: Pc Sound Card Mixer Setting

    5. PC sound card mixer setting. In order to get the best performances a proper setting of the sound card Mixer must be done. Open the mixer and disable the mike and line as inputs for the speakers. Wave and Volume only should be enabled for sound reproduction. Open the mixer and enable as recording input the line input.
  • Page 30 The recording level must be adjusted carefully in order to have a good decoding of DRM and all the analogical mode CW, SSB, AM and FM.
  • Page 31 A fine adjustment of the level with your sound card you should enter the MAIN SETUP of the FDM77 clicking the SETUP button in the cockpit. With the MAIN SETUP wizard open click the calibration button. A new panel will popup...
  • Page 32 OK” appear on the upper left side of the panel. In case the fine adjustment is reached with the highest position of the sliding bar set the Hi-Lo switch located on the rear panel of FDM77 to Hi position and repeat the adjustment.

  • Page 33: Specifications

    6 Specifications Specification Value Remarks Operating ranges A: 10 kHz – 30 MHz A: 10 KHz to 100 KHz B: 48 MHz – 60 MHz B: 55 MHz to 60 MHz With reduced performances Frequency resolution 1 Hz Min. Frequency stability 2 ppm after 15 min.

  • Page 34: About

    • Windows 2000 and Windows XP are registered trade mark of Microsoft Corporation • USB 2.0 is a registered trade mark of USB IF • ELAD software radio of FDM product line is a proprietary software developed by ELAD srl (http://www.eladit.net) and integrating software modules for : •...

  • Page 35: Declaration Of Conformity

    Declaration of Conformity The device name Software Defined Radio HF Receiver FDM- 77 ELAD S.r.l. made by Address: Via Col De Rust, 11 33070 Sarone di Caneva (PN) ITALY is herewith confirmed to comply with the requirements set out in the Council Directive on the...

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