Important Note:


WITH IMMEDIATE EFFECT
:

DUE TO THE UNEXPECTED GOING OUT OF BUSINESS OF AN IMPORTANT SUPPLIER MEDIA ENGINEERING CANNOT DELIVER ANY NEW ME-TUN UNITS NOW AND FOR THE NEXT FUTURE. WE ARE WORKING ON SOLUTIONS TO OVERCOME THIS SITUATION ON THE FASTEST POSSIBLE WAY. WE WILL SEND OUT INFORMATION, AS SOON AS THE PRODUCTION IS RESTARTED.


R
ecommended end user list price is EUR 2'700.- (our AGENTS prices may vary a little due to country-
or marketspecific adaptations).

The combination of the ME-TUN and the FM-SPY is resulting in the device FM-SPY-T
Its recommended end user list price is EUR 3'700.-


Download the content of this page in the PDF format (520KB): "ME-TUN.pdf"

Download the ME-TUN User's Manual in the PDF format (454KB): "ME-TUN-MANUAL.pdf"


"ME-TUN" is a FM sound broadcasting receiver from MEDIA ENGINEERING developed for professional applications. It's a branch-development originating in the project "FM-SPY" from MEDIA ENGINEERING and it has been developed due to a number of customer requests asking for a professional FM sound broadcasting receiver.

The "ME-TUN" FM receiver is a very powerful and cost effective device. It has been developed under strict considerations of all relevant norms as well as own experiences of MEDIA ENGINEERING in this field of engineering. "ME-TUN" is intended to be used in rebroadcasting relais-stations or as monitoring receiver in broadcasting stations or in cable headends.

Only an AC power source and a receiving antenna signal are necessary for the operation of the "ME-TUN". Special circuitry inside the "ME-TUN" is securing that the most often operating problems - mainly in systems with more than one tuner - are prevented due to precautionary measures. It is providing many functions and possibilities and especially a multitude of interesting additional signals and functionalities, which are very difficult to optain with traditional means.


BASICS

The "ME-TUN" FM sound broadcasting receiver is built into a metal case with a scratch-resistant pearl-effect lacquer. Delivered with the accessories is a rack mount set with which the table top device is expandable into a 19"/1RU component. The 19"-kit is mountable very fast and easy with only one screw.

The power supply to the "ME-TUN" is made with a three wire power cord connected to the power line network. A modern switched mode power supply is allowing unrestricted operation of the "ME-TUN" over a wide power line voltage and power line frequency range worldwide.


2 ANTENNAE INPUTS

The precision FM tuner built into the "ME-TUN" is receiving its RF signal from one of two antennae inputs. This is advantageous in case of receiving certain stations only via cable and others only via air. The anntenna input connectors are type "F" connectors and they are mounted on the rear side of the device. Delivered with the accessories is a pair of "F"<->"IEC" adapters in order to provide the possibility to connect antenna cables with IEC connectors.

Both antennae inputs are decoupled with RF transformers. So the inputs are completely earth-free; they are not having a connection to the chassis or to earth via the power cord. This decoupling prevents that the potential of the antenna cable (which only very seldom is earth potential) is short-circuited with the earth supplied by the power supply, for this were leading to compensation currents which in turn is the most often reason for hum problems.

Both antennae inputs have an impedance of 75 Ohms. With the help of a newly developed solid state RF switch it's possible to match also the unused antenna input with 75 Ohms. This is especially helpful in larger systems with several receivers for no problems are to be expected due to varying impedances.


ANALOG AUDIO OUTPUTS

The "ME-TUN" FM sound broadcasting receiver is featuring an analog stereo output with two 3pin XLR connectors mounted on the rear side of the device. The output driving amplifers are tranformerless built as electronically balanced circuits in the well known "balanced servo loop amplifier" technique. So the nominal operating level on the output is constant (at +6dBu) also while loading the output strongly unbalanced.


DIGITAL AUDIO OUTPUT

The "ME-TUN" FM sound broadcasting receiver is having a digital audio AES/EBU output additionally to the analog output. This output is brought to a XLR connector mounted on the rear side of the device. The circuit is built as a transformer-coupled driver for a digital audio signal according to AES/EBU (rsp. IEC958 & EIAJ CP-340). The built-in impulse transformer is manufactured by SCIENTIFIC CONVERSION which is featuring a screen between the primary and secondary windings what leads to excellent CMRR and clock jitter values even for sampling frequencies up to 96kHz.

The factory setting for the digital audio sampling frequency is 48kHz. With only a few easy and fast manipulations inside the "ME-TUN" the sampling rate can be changend to 32kHz or 44.1kHz or 96kHz also.


ELEGANT OPERATION

The "ME-TUN" FM receiver is equipped with LED illuminated push-buttons on the front side. The operational concept ist very easy and smart for the following rule is applicable for all machine states:

ONLY ILLUMINATED PUSH-BUTTONS ARE PERMITTING A USEFUL COMMAND IN ANY STATE.

This means that no detailed knowledge of a user's manual is necessary and the operation is going to be faster, saver and simpler.

Proceeding on the assumption that the "ME-TUN" is in its normal operating state - which is the default state as taken up after three seconds without any action - the following operational steps are possible:

Setting a receiving frequency through directly keying in the new frequency. The frequency has to be set with 0.025MHz precision.

Storing the actual receiving frequency as one of 40 memory presets.

Toggling the display for a bar graph reading meter or a digital read-out meter of the receiving signal strength and the PSN-signal of the RDS data stream.

Selecting the SCAN function in order to search automatically through the FM band and memorizing stations in preset memories starting with tha highest frequency at the highest preset number

Selecting the menu function for stepping up or down the receiving frequency in 25kHz steps.

Selecting the menu function for stepping up or down the preset stations

Selecting the antenna input in use.

Two push-buttons left of the headphones connector on the front panel are serving as volume controls for the headphones output. Each pressing of a key changes the volume by approximately 1dB. If the key is held down a longer period of time the volume is fading up or down smoothly. When both push-buttons are pressed down simultaneously the volume jumps to the lowest possible value and if they are pressed down simultaneously and for a longer perios of time the level jumps to a predetermined "normal" value.

A wideangle readable LCD display module with white characters on blue background is showing:

· the actual receiving frequency in MHz
· the PSN signal (when RDS is present)
· the signal strength of the antenna signal (as a bar graph or as a readout in dbuV)
· the selected antenna input A or B


RESTARTING AFTER POWER INTERRUPTION

After an interruption of the AC power supply the "ME-TUN" is restarting rsp. rebooting automatically within a second. It's taking on the operational state befor the power failure happened. The analog outputs are driving the analog signal after a second and the digital AES/EBU output after additional 3 seconds.


AUXILIARY FEEDS AND TALLY SIGNALS

Different alarms and auxiliary functions are provided:

- MPX signal output, unbalanced, full bandwidth

- RDS data and RDS clock and RDS quality digital signals
- potential free optocoupler output for the RDS DETECT signal
- potential free optocoupler output for the RDS TP bit
- potential free optocoupler output for the RDS TA bit
- potential free optocoupler output for the CARRIER DETECT signal
- potential free optocoupler output for the STEREO DETECT signal
- fused +5VDC output to drive optocouplers
- SCA audio rsp. SCA data signals


TECHNICAL SPECIFICATIONS "ME-TUN"


ANTENNAE INPUTS

number of antennae inputs .................................................................................................... 2
antenna input impedance .…...................................................................................... 75 Ohms
antenna input connector type............................................................................... F (receptacle)
antenna input circuit.................................................................... transformer balanced earthfree
antenna selecting switch: ……………….........……….…. the un-used input is matched to 75 Ohms

FM RECEIVER

receiving frequency range ...............................................…………….. 87.500MHz - 108.000MHz
receiving frequency step width ...………….................................................................…... 25kHz
sensitivity ................................................................................................... 5uV@30dBSINAD
intermodulation ..…............................................................................. 5mV (73dB) suppression

ALARM OUTPUTS

Connector Type ........................................................................... Chassis D-type, male, 15 pin
Number of Alarm Outputs ................................................................................ 5 photocouplers
High isolation voltage (UL and VDE approved) ........................................................... 3'750 Volts
load capacity ......................................................................... UCEmax = 40V / ICmax = 40mA
Additional DC Output ................................................................................ +5.0 VDC, stabilized
Fusing of additional DC Output .…….............................................................. PTC, Ihold = 0.5A

POWER SUPPLY

mains power voltage ................................................................................……….. 90 - 250 VAC
mains power line frequency ...................................................................................... 47 - 63 Hz
power consumption .…………................................................................................... < 25 Watt

PHYSICAL DIMENSIONS

width x depth x height ..........................................................................…... 380 x 260 x 44 mm
weight ......................................................................................................................... 4.5 kg



PICTURE: a view to the rear side of the ME-TUN

INCLUDED ACCESSORIES:

1 pcs. power cord, 3wire
2 pcs. antenna connection adapter type "F-male" <->"IEC-male"
2 pcs. 19"/1RU rack mount kit
1 pcs. user's manual

subject to change

Copyright by MEDIA ENGINEERING

For further information please contact MEDIA ENGINEERING or one of our AGENTS!