Archives: News

EM2000 2KW FM TRANSMITTER

Phase Locked Loop Programmable
FM Exciter/Transmitter 87.5 – 108 MHz Range

0 – 2000 Watts adjustable power

High-efficiency MOS-FET technology

Easy-to-use control interface

Innovative Compact FM broadcast transmitter for radio stations, hot-plug POWER SUPPLY module, high performance. Easy to maintain, high reliability, easier to operate …

Includes low pass/harmonic filter and can be used as a stand-alone transmitter
-Instant front panel programmability
-All functions via LCD password protected
-Adjustable power output from 10 to 2000 W
-Extractable power supplies
-Telemetry features include: power on-off, fwd & reflected power metering, modulation and temperature …

Compact 2000W FM Transmitter

Features
FREQUENCY RANGE: 87.5 ÷ 108 MHz
MODULATION: FM
EMISSION CLASS: F3E
VCO TUNING: 25 MHz
FREQUENCY STABILITY: ± 2.5 ppm (bette upon request)
SYNTHESIZER STEP: 10KHz / 100KHz
POWER OUTPUT: 0 ÷ 3000 Watts 0 ÷ 5000 Watts
SPURIOUS EMISSION: < – 85 dBc or better
HARMONIC EMISSION: < – 74 dBc
MPX STEREO SEPARATION: > 56 dB @ 1KHz
HARMONIC DISTORSION: < 0.1 % (TYP. 0.06%) @ 1KHz
BASE BAND: 30 Hz ÷ 60 KHz within 0.05 dB
UNWEIGHTED S/N RATIO: >80 dB (30Hz ÷ 15KHz 50μS RMS)
ASYNCRONOUS AM S/N Ratio: > 65 dB Ref. 100% AM 400Hz
SYNCRONOUS AM S/N Ratio: > 60 dB with FM @ 75KHz @400Hz
PRE-ENPHASIS: 50 OR 75 μS int. selectable
RF OUT CONNECTOR: 7/16”-F 50 Ohm 7/8″ 50Ohm
MPX INPUT CONNECTOR: BNC-F
MPX INPUT IMPEDANCE: 2 KOhm
SCA INPUT CONNECTOR: BNC-F
COOLING: High efficiency brushless fans
OP.TEMPERATURE RANGE: – 10 ÷ +45 °C
MAXIMUM UMIDITY: 90 % not condensing
AC SUPPLY: 110 ÷ 250 VAC – 47 ÷ 63 Hz
OVERALL EFFICIENCY >70%
DIMENSION: 5 unit rack 19″, 600mm depth

FM high power transmitters: 5, 10, 20 or 40 kW hot plug-in, analog & digital; or 300W, 500W, 1, 2, 3, 5, 6 kW analog & digital or turn-key FM Radio stations

Call or write to our: ELETEC RF specialists

EM3000 3KW FM TRANSMITTER

Phase Locked Loop Programmable
FM Exciter/Transmitter 87.5 – 108 MHz Range

0 – 3000 Watts adjustable power

High-efficiency MOS-FET technology

Easy-to-use control interface

3000W FM Transmitter Solid State, the new EM3000 FM Transmitter Exciter Series. Innovative FM broadcast transmitter for radio stations, hot-plug POWER SUPPLY module, high performance. Easy to maintain, high reliability, easier to operate.

Includes low pass/harmonic filter and can be used as a stand-alone transmitter
-Instant front panel programmability
-All functions via LCD password protected
-Adjustable power output from 10 to 2000 W
-Extractable power supplies
-Telemetry features include: power on-off, fwd & reflected power metering, modulation and temperature.

-Latest audio sound in the FM Broadcasting industry with TOP Audio & RF technology.

3000W FM Transmitter

Features

FM3K FM5K
FREQUENCY RANGE: 87.5 ÷ 108 MHz
MODULATION: FM
EMISSION CLASS: F3E
VCO TUNING: 25 MHz
FREQUENCY STABILITY: ± 2.5 ppm (bette upon request)
SYNTHESIZER STEP: 10KHz / 100KHz
POWER OUTPUT: 0 ÷ 3000 Watts 0 ÷ 5000 Watts
SPURIOUS EMISSION: < – 85 dBc or better
HARMONIC EMISSION: < – 74 dBc
MPX STEREO SEPARATION: > 56 dB @ 1KHz
HARMONIC DISTORSION: < 0.1 % (TYP. 0.06%) @ 1KHz
BASE BAND: 30 Hz ÷ 60 KHz within 0.05 dB
UNWEIGHTED S/N RATIO: >80 dB (30Hz ÷ 15KHz 50μS RMS)
ASYNCRONOUS AM S/N Ratio: > 65 dB Ref. 100% AM 400Hz
SYNCRONOUS AM S/N Ratio: > 60 dB with FM @ 75KHz @400Hz
PRE-ENPHASIS: 50 OR 75 μS int. selectable
RF OUT CONNECTOR: 7/16”-F 50 Ohm 7/8″ 50Ohm
MPX INPUT CONNECTOR: BNC-F
MPX INPUT IMPEDANCE: 2 KOhm
SCA INPUT CONNECTOR: BNC-F
COOLING: High efficiency brushless fans
OP.TEMPERATURE RANGE: – 10 ÷ +45 °C
MAXIMUM UMIDITY: 90 % not condensing
AC SUPPLY: 110 ÷ 250 VAC – 47 ÷ 63 Hz
OVERALL EFFICIENCY >70%
DIMENSION: 5 unit rack 19″, 600mm depth

How to tune a Coaxial Filter

In Fig is shown the connection between Network Analyzer and a Coaxial Filter: with this kind of connection you can measure the Return Loss and the Standing Wave Ratio of the cavity. The frequency Span of the test instrument will be from 5 to 10 MHz. Moving them symmetrically, the return loss change and the frequency will move slowly. The B.W. command allows to set the selectivity of the filter. With the B.W. command extremely open the selectivity will be minimum as the attenuation loss. With the B.W. command closed the selectivity will be maximum as the attenuation loss.
The Coaxial Filter is tuned by move up/down the 2 knobs named “TUNE” for the frequency and rotate the in/out connectors named “LOAD” for the correct Return Loss.
Usually it is better to tune the coaxial filter trying to obtain the best Return Loss inside the wanted band, this is the best way to obtain also a low attenuation between the input and the output port of the filter. If a measure like this is made only using the SWR meter of a transmitter it could be possible to make a big mistake, because the operator could think he optimized the transmission while instead the transmitter is working at the left or right side of the band, so during the modulation it could happen that the SWR increases.

EM2500 2.5KW FM TRANSMITTER

Phase Locked Loop Programmable
FM Exciter/Transmitter 87.5 – 108 MHz Range

0 – 2500 Watts adjustable power

read more

FM Fine Matcher

Now ing have under test the new ” FM Fine Matcher ” to adapt and reduce the SWR in not perfect antenna systems.

For more information about FM Fine Matcher, call us at 0033 4 93 019 999