UHF and Nicam audio module data sheet

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DATA SHEET - UHF Video Tuner module with Nicam Audio. Display Electronics order code MY00

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The Nicam UHF tuner module consists of a main PCB containing three modules, the two long cans are UHF tuners and the third smaller can is the Nicam audio module. All tuning and control is via a standard PC or PIC using the industry standard I2C serial bus. A small add on board provides convenient input output connections and a video buffer amplifier to provide 1V pp video output level into 75 ohms. A simple program written in QuickBasic with source code is supplied (download) to enable full tuning control from the printer port of an IBM type PC.

My00_dat.jpg (14461 bytes) nicam_pad.jpg (27769 bytes) Nicam Tuner PCB Paddle Board

Using the unit
Connect the paddle board to a good quality regulated power supply capable of supplying the Voltages and currents specified in the table below.

If Nicam stereo output required connect the two audio sockets on the main board to the left and right Tuner or Aux. input of a Hi Fi system, and the video output to any 75 Ohm composite video input found on VCR's or most SCART connectors on most modern TV receivers.

Connect a TV aerial to the coaxial socket on the rear PCB. Although the tuner is very sensitive, and will cover a wide range of input levels, best results will be achieved according to the quality / signal strength of the UHF TV signal which can vary according to your geographic location. Insufficient signal strength will result in picture snow, ghosting and pops and crackles on the Nicam audio output. Excessive signal strength will result in cross modulation and possible audio / picture distortion.

The second coaxial socket on the main board may be connected to your video or Tv's aerial input. This will allow you to 'loop through' the aerial signal for simultaneous use with other equipment sharing the same aerial etc.

The second tuner module is intended for RAW data output, removal / disconnection of this unit will lower the DC current requirements to 155 mA on the 12 Volt supply & 600 mA on the 5 Volt supply.

Connect the I2C connections to the printer port of a standard IBM PC with either a modified printer cable or with a standard 25 way D type plug (male) The connections required are pin 2 to SCL (solder pad B) pin 3 to SDA (solder pad C) & any pin between 18 & 25 to solder pad A which is the digital ground connection. Run the PC software supplied to drive the I2C bus.

25pdsub_female.psd (25492 bytes)

For other stand alone TV Video & Audio Tuners,
including units to cover the UK cable bands - see TELEBOX

Paddle Board Connection Ident Note

Phono Socket
Phono Socket
Pin Header
Solder Pad
Solder Pad
Solder Pad
Solder Pad
Solder Pad
Solder Pad
Solder Pad
Solder Pad
Solder Pad
Solder Pad
Solder Pad
Solder Pad

PH1
PH2
PL1
A
B
C
1
2
3
4
5
6
7
8
9

Buffered composite video output.
Mono audio output
20 way ribbon to tuner module
0v digital volts (ground) connection
SCL (serial clock) I2C bus
SDA (serial data) I2C bus
Nicam right hand audio output *
Nicam left hand audio output *
0 V analogue (ground) connection
Video output V1 from fixed tuner
Video switch TTL high enables V1 output **
Video Tuner 2 output unbuffered
+12 V DC input, regulated @ 240 mA
+5 V DC input, regulated @ 650 mA
0 V Analogue volts (ground) connection

* Duplicate of output from phono connectors on main tuner board.
** Remove link to use this facility
Additional Notes
!!! Do not exceed the DC power supply voltages shown !!!
The second tuner module (output V1) was intended as a RAW data receiver for Teletext and therefore has no audio output, this may be removed to lower overall power consumption.
Use a good quality regulated power supply to ensure minimum noise on audio and video outputs.
Tuners are designed for the PAL UHF television standard only.

Disclaimer
Display Electronics formulates the data offered from manufacturers data sheets, testing and technical evaluation. Whilst every possible care is taken to ensure the accuracy of this information, no responsibility whatsoever can be taken for loss or damage resulting in interpretation or suitability of use for a given application. When using electricity always apply standard safety precautions especially with mains / line voltages. Mains / line voltages can be dangerous and lethal possibly causing death. If you are in any doubt always seek the advice of a qualified or competent person prior to use. Also see our Standard Conditions of Sale.