The AMM-SD1 Off Air RF Pickup Unit

Using the AMM-SD1 Modulation Monitor with Part 15 Broadcasting

Using the Radio Engineering Associates Off-Air RF pickup unit, the AMM-SD1 will work well with your part 15 transmitter, without any connection to the antenna or transmitter.

The off-air interface covers the frequency range from 400kHz to 1750kHz and requires 100mV (minimum) of carrier to operate. This is easy to obtain by simply locating a wire or other antenna near to, or in the vicinity of the transmitter or transmitting antenna, and connecting this wire either directly or through a piece of feedline to the AMM-SD1 off-air RF pickup.

With Part 15 transmitters, ranges of 1 to 2 miles or more are possible. See the Hamilton RangeMaster AM 1000 Page for more information about part 15 broadcasting, and related equipment.

Using the AMM-SD1 Modulation Monitor with a standard communications receiver I.F. output

Features and Specifications

• RF Input Frequency Range: 400kHz to 1750kHz

• RF Input Level (carrier): 100mV minimum, Hi impedance (greater than 20k ohms)

• RF Input Connector: BNC

• Output: Demodulated RF suitable for the AMM-SD1 Modulation Monitor

• Aux. Input Connector (automatic switching): .125 inch stereo connector. This input may be connected to a standard RF pickup unit. When a signal is detected at this input, the Off-Air Pickup will switch the input from the low level RF source (typically a receiver I.F. or part 15 transmitter) to the auxillary input

• Modulated Signal Capability: 175% positive, 100% negative

• Power Source: 12VAC, 1A wall transformer, 120VAC 60hZ

How to Purchase

The Off-Air RF Pickup may also be ordered as an individual item for $229.95

See our product ordering page to purchase any of our products.

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