Print Date 04/01/11 Page 10 of 42 E2165-00MA-04
1.3 TECHNICAL SPECIFICATIONS
The XE150/300 Series of FM Exciters is designed to meet or exceed ETSI Standards :-
EN 301 489-01 : ERM/EMC for Radio Equipment, Part 1, Common Technical Requirements.
EN 301 489-11 : ERM/EMC for Radio Equipment, Part 11,Special Conditions for FM Transmitters.
EN 302 018-02 : ERM (Spectral Occupancy) for the FM Radio Broadcast Services
EN 60215:1989 : Safety Requirements for Radio Transmitting Equipment.
‘Overall’ performance is specified with the RF output demodulated using a high quality FM/AM
demodulator and a high quality stereo or mono decoder. Audio and composite/mpx test sources also
exceed the rated Exciter performance by at least 10dB or equivalent.
The normal stereo signal generated by the Exciter or source consists of :-
±
75kHz maximum deviation due to a mono signal
±
67.5kHz maximum deviation due to left/right stereo signals
(less in both cases if RDS and/or SCA signals are also generated)
±
6.75kHz deviation due to 19kHz pilot tone (stereo signals only)
giving a total maximum of approximately
±
75kHz
Unless otherwise specified, ‘overall’ performance is specified at the above deviation levels with
+8dBu/5.5V peak to peak test signal(s). Pre-emphasis is applied in the Exciter or test source and de-
emphasis applied in the measuring equipment. Any other Exciter signal processing circuitry (e.g.
limiters, clippers etc.) is switched off.
1.3.1: Common Specifications
RF Output Port
50
Ω
nominal, N Type Connector
Carrier Frequency
87.5-108MHz in 50kHz steps with seven stored channels (in programmable
non-volatile ‘flash’ memory). The channels can be programmed and selected
locally and remotely. Frequency change time approximately 15secs (RF
output muted during change period). Performance equal to or better than :-
Stability :
±
2ppm maximum over –5 to +50deg.C (
±
200Hz at 150MHz)
Ageing :
±
1ppm over first year (
±
150Hz at 150MHz)
Adjustment :
±
3ppm using internal trimmer (
±
5ppm using voltage trimmer)
Variation :
±
2ppm with 75kHz deviation applied (
±
200Hz at 150MHz)
Under normal operating and maintenance conditions, the resulting frequency
error should be less than
±
200Hz, typically less than
±
150Hz.
Output Power
With any load with a return loss >14dB (1.5:1 VSWR) any angle.
XE150 Adjustable over range of at least 40W to 150W (Normal Mode)
XE300 Adjustable over range of at least 40W to 300W (Normal Mode)
Both adjustable over range of typically 10W-40W in Driver Mode
Variation : Not more than
±
0.5dB under all specified operating conditions
Output Power
Shutdown
Output power is automatically reduced or shutdown to ensure that any load
producing reverse power greater than approximately 30W including open and
short circuits, does not cause any damage to the Exciter. Excessive heatsink
temperature (greater then +85 deg.C) or output amplifier current also
automatically reduces or shutdowns the output power.
Reverse
Intermodulation
Reverse intermodulation products will be better than or equal to –10dB,
relative to the interfering incident signal, this being offset over the range
±
300kHz to
±
20MHz (but remaining within 87.5MHz to 108MHz).
