5
AM Series
Instruction Manual
Description
The AM Series are professional quality agile audio/video modulators equipped with an Emergency Alert System (EAS)
feature, which can also be used for an alternate IF input. The units provide an audio and video modulated RF carrier on
any channel from 54 to 550 or 806 MHz depending upon the model. Any standard audio/video source can be used, such
as satellite receivers, television cameras, video tape recorders, or television demodulators.
Channel tuning is easily accomplished with the use of front panel channel up/down push buttons. Frequency plans
include CATV Standard EIA, IRC, HRC & Broadcast. All channel frequency information with appropriate FCC offsets is pre-
programmed and tuned electronically via a microprocessor.
The AM Series have optional features to fit many different applications. A stereo audio option, Option 05, also allows the
integration of a BTSC stereo encoder module into the AM Series. This optional stereo encoder converts stereo left and
right audio into a composite BTSC stereo audio signal. The factory installed option provides 20 dB of stereo separation,
less than 1.0% total harmonic distortion and 60 dB signal to noise ratio.
The EAS / Alternate IF feature allows a choice between manual and automatic selection of the EAS/ALT IF input signal. This
is done through a 3 position terminal strip on the rear of the unit. In the manual mode the EAS/ALT IF feature is activated
by a contact closure switch, which completes a ground connection. In the automatic mode, two positions on the terminal
strip are jumpered together enabling an automatic detection circuit in the unit. When an EAS/ALT IF signal is routed to the
EAS/ALT IF port the unit automatically switches to that alternate signal.
The AM Series meets FCC Docket 21006 aeronautical frequency offset requirements (5 kHz video carrier accuracy). A high
in-channel carrier to noise performance of 63 dB typical is achieved by the unit. A custom SAW IF filter is employed to
provide true vestigial sideband selectivity with built-in FCC group delay equalization. A state of the art converter design
with pre-programmed microprocessor controlled channel tuning ensures that the Blonder Tongue AM Series are the ideal
agile modulator for any demanding CATV headend need.
Options
02 Video Input Connector BNC 75 Ohm
04 Sub Band Output (AM-60-550 only)
05 Stereo Audio
07 Video AGC
08 Audio AGC
09 Balanced Audio Input