ITEL ISO-FM

FM SFN Isofrequency Sync Adapter

The ITEL ISO-FM is a FM SFN isofrequency adapter which allows synchronizing one or more FM repeaters operating over the same area and using the same frequency. It is ideal for coverage area optimization, allowing to reuse the main coverage area frequency, to activate one or more gap-fillers.

Installation and setup is very quick: the unit must be connected between the STL receiver and the FM modulator and it will also generate a 10MHz reference signal used for the FM modulator: no GPS frequency reference is needed.

The unit can be controlled remotely with an optional internal webserver (opt.LAN) which will also provide a 9600bps general purpose serial port that can be used, for example, to control the connected transmitter.

The best results are obtained only through a careful planning of the iso-frequency network, so ITEL SNC will provide a free consulting service for all customers interested.

Available from Itel an audio sample, recorded in an urban area where the signals, coming from two transmitting sites, were received at the same level.

In this kind of application, starting from 0 to 10 seconds the device is bypassed, from 11 seconds onwards the delay compensation is turned on but the transmitting frequencies are still not PLL-locked. From 19 seconds onwards, the PLL is locked and the heterodyne whistle disappears.

Product Option: Ethernet Interface

Technical Details:

Input impedance

10Kohm

Nominal input level

775mV RMS - 2.2 Vpp

Passthrough gain

0dB

Bandwidth

1Hz - 75 KHz

Bandwidth flatness

+/- 0.1dB

Adjustable delay

1390uS + 4995uS / - 1245uS

MPX phase control

+/- 180°

Reference frequency output

10MHz/2500Hz (internally selectable)

Operating temperature

0° - +50°C

Power supply

100 - 240VAC 25VA

Dimensions

44mm (H) x 483mm (W) x 150mm (D)

1 RU 19"