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Armstrong's FMX series of FM Exciters offer clean audio sound combined with exceptional reliability, quality and "plug and play" installation: FMX exciters are available in powers from 30 to 300 watts and Solid State Amplifiers at 650 and 1,300 watts.


Our exciters are FCC approved for use as exciters and stand alone low power transmitters. All feature full remote monitoring capability, multiple SCA inputs.
PDF Links to Standard FMX Series Exciter Literature
(to download the files, right click on the link and choose 'Save Target As...', otherwise, left click to open)



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FMX150B.PDF
FMX300B.PDF
FMX30B.PDF
CD Quality Exciters
Stations wishing to step up to CD Quality Audio are advised to consider the Armstrong FMX LCD series. Offered at 30 and 100 watts the FMX LCD series features Automatic Modulation Output Control that holds modulation constant even with variations in program level, Automatic power output control, VSWR protection and more. The FMX LCD series also has a field upgrade available to allow a station to start with an analog exciter and upgrade to AES/EBU input when they are ready for an all digital air chain.Of special interest to mutiple station owners is the FMX LCD's ability to be switched between 5 preset frequencies via remote control. This allows broadcasters with co located transmission facilities to use one exciter and a solid state amplifier as a back-up for up to five stations.
PDF Links to LCD Exciter Literature(to download the files, right click on the link and choose 'Save Target As...', otherwise, left click to open)
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FMX-100LCD.PDF
AESEBU_MODULE_FOR_LCD_EXCITERS.PDF
Armstrong's "LCD Series" and "Series B" Solid State FM Transmitters offer you the maximum redundancy available in solid-state transmitters today.
Our design utilizes a building block approach to achieve the required transmitter output power. Multiples of either our FM1000LCD or FM2000B self-contained Solid State Amplifier are rack mounted with an appropriately sized driver and externally combined.

These amplifiers both use 300-watt RF modules that contain the Philips BLF 278 MOSFET. This commonly available FET has been proven in thousands of solid state transmitters in use worldwide.

Armstrong ensures that each output device is thermostatically protected and protected against excessive VSWR by a fold back circuit, which proportionally reduces power when VSWR is present. In addition the transmitter combiner also triggers fold back when external VSWR is detected.

Metering and Alarm indications are available for each amplifier, the exciter and the driver. Plus, overall transmitter metering and alarms are available both on the transmitter and for remote monitoring via DB25 connector located on the rear panel of their chassis.
PDF Links to FM Transmitter Literature:
(to download the files, right click on the link and choose 'Save Target As...',
otherwise, left click to open)
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FM2500B 2.5KW FM Solid State Amplifier
FM Series B Medium Power Solid StateTransmitters
FM Series C Medium Power Solid State Transmitters
Armstrong's Single Tube Transmitters have become affectionately known as "Work Horses". The grounded grid, broadband PA design, offers several benefits not found in other transmitter designs.

NO Neutralization: A single tube in this configuration never oscillates and does not need to be neutralized. This design is also the most stable transmitter design available.

Exceptional Tube Life: Depending on the power level of your transmitter you may experience tube life up to 5 years or more.

Low AM Noise: The broadband design of the PA offers the lowest AM noise levels to be found in a tube transmitter.

Each of Armstrong's single tube transmitters offer our unique PA thermostatic protection. If there is an occurrence which causes the PA temperature to rise above the factory preset the Transmitter control circuitry will shut the transmitter down and alarm of the condition before damage can occur to the PA. VSWR protection and easy remote control hook up are all standard feature regardless of transmitter power level.
In power levels above 5KW we have enhanced out control system, control circuitry and our design. We have added Fiber Optic PA Arc Detection, temperature sensors in the power supply on key components and the option of our LCD controller is available from 5KW to 15KW. This feature is standard on High Power Transmitters from 20KW to 35KW.

In addition Armstrong has designed in several safety features that are, like the those mentioned above, unique to Armstrong Transmitter. One of the main safety features we've added is placing the power supply components on to a dolly that rolls completely out from the transmitter cabinet. This allows the engineer to have complete access to all components without having to squeeze into the transmitter cabinet. This not only expedites trouble shooting of the
power supply components but it also helps prevent
physical injury, such as back injury or worse, to the
engineer, should replacement of heavy components
become necessary. It becomes a simple matter of
sliding heavier components off the dolly and sliding
replacement components back on VS. having to lift
them out of the confined space of a transmitter
cabinet and lifting them back in while kneeling in
a contorted position.
PA CAVITY
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PDF Links to Single Tube FM Transmitter Literature
(to download the files, right click on the link and choose 'Save Target As...', otherwise, left click to open)
Single Tube Medium Power: T2 Series Medium Power
Single Tube High Power: T2 Series Medium Power
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