RDL ACM-3 Amplitude Component Monitor

MSRP: $1,257.45
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RDL's® ACM technology is the only time-proven, industry accepted method of controlling Synchronous AM Noise (the elusive FM transmission bandwidth variations that aggravate multipath artifacts in listeners' receivers). Hundreds of top performing FMs in every major U.S. market turn to ACM technology for maximum bandwidth performance. Every transmitter, new or old, can easily produce poor bandwidth, or can be made to perform as well as any signal in the market. Every FM station needs ACM technology to provide the accurate AM measurment and continuous monitoring needed for optimum transmitter tuning and performance.


  • Maintain Clarity
  • Maximize Loudness
  • Maximize Stereo Separation
  • Reduce Subcarrier Crosstalk
  • Assure Consistency of your Signal Coverage
  • Maintain Positive Control of Multipath Artifacts
  • Maximize Performance From Your FM Transmitter
  • Mount using RU Series Mounting Options



Input/Ouput Connector:

Maximum Input Signal:
30 V (combined filtered carrier + AM)

Measurement Range:
-20 dB to -69 dB (front-panel display), -10 dB to -90 dB (front-panel scope jack)

Residual Noise:
< 95 dB below 100% amplitude modulation

Oscilloscope Jack:
BNC 5 V p-p for full-scale display

Audio Output:
+4 dBu, 100 Ω source impedance

THD of recovered AM:
< 0.03%

DC Output:
DC level representing significant synchronous AM

Ambient Operating Environment:
0° C to 50° C

Power Requirement:
18 Vac, external supply included (North America)

1.7 in. x 5.8 in. x 4.1 in., (4.1 cm x 15.0 cm x 10.4 cm)

Package Type:
Cardboard Box

Package Dimensions:
6 x 6 x 2.625 in.

Shipping Weight:
1.395 lbs.

WEEE Weight:
1.155 lbs.

Tariff Code:


RDL Three-Year Limited Warranty Installation of these products by the Purchaser shall constitute Purchaser’s acknowledgement and acceptance of the terms and conditions for sale and of this warranty, and shall constitute the Purchaser’s determination of the suitability of this product for the Purchaser’s intended application. Radio Design Labs, Inc., also referred to as RDL®, warrants to the Purchaser that products manufactured by RDL are free from defects in material and workmanship. This warranty applies to the period of three years from the date of shipment, except for component parts or products purchased from other sources and supplied by RDL. Such component parts or products bear only the warranty of the manufacturer thereof in effect at the time of shipment to the Purchaser. RDL will, without charge, and after written notice has been received and acknowledged by RDL, repair an RDL product if proved to be defective according to the usage of the trade, when such equipment is received by RDL at the location it designates with shipment costs prepaid by the Purchaser. RDL shall not be liable for any expense whether for repairs, replacements, material, service, or otherwise, incurred by the Purchaser or modifications made by the Purchaser to the product. No equipment shall be deemed defective if it shall fail to operate in a normal or proper manner due to exposure to excessive moisture in the atmosphere, excessive temperature extremes, improper environmental cleanliness, or any other environment not consistent with the principles of good engineering practice. In no event shall RDL have any liability for consequential damage or expense directly or indirectly arising from the use of the products, or any inability to use it either separately or in combination with other equipment or materials, or from any other cause, whether used in accordance with instructions or not. This warranty is void if equipment is altered in any way by other than RDL. RDL products are NOT intended for use in life support appliances, devices, or systems. Use of RDL products in such applications is done solely at the liability of the reseller/installer and/or end user. RDL reserves the right to change design parameters and specifications at any time without notice. The performance measurements reflect the products at the time of printing. This warranty is in lieu of all others, either expressed or implied. No representative is authorized to assume for RDL any other liability in connection with RDL products.