User's Guide

3-8 Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 935 MHz
3.5.6 Jumper Configuration
Solder jumpers are clearly marked on both synthesizer digital and analog circuit boards
. Refer to
the
"OS(R/T)-3(A/H) Digital Board Component Layout (Bottom)" diagram on page 4-20 of this
manual and the applicable
"OS(R/T)-3(A/H) Analog Board Component Layout (Top)" diagram
on page 4-21 for jumper locations
. The following list details the required jumper configuration
for the two synthesizer operating modes:
1) Internal reference
. Install jumper JU1-B, on the Analog Board (Standard). The internal
temperature compensated crystal oscillator (TCXO) provides the reference signal with a
stability of ±1 ppm from -30°C (Optional -40°C) to +60°C.
2) External reference input
. Install jumper JU1-A and JU2 on the Analog Board. This
mode is used in applications requiring better than ±1 ppm frequency stability
. An
external reference signal must be provided at synthesizer SMB connector J1
.
3) Reference Frequency Select
. Install jumper JU2 on the Digital Board to select a
10.0 MHz reference frequency
. When not installed, the reference frequency is by default
9.6 MHz
. JU2 must not be installed when using the internal 9.6 MHz TCXO reference.
JU2 is used by the microcontroller to establish the correct reference frequency division
ratio
. (Located on the Digital Board; The Synthesizer module must be removed to
change jumper JU2.)
4) AM Multichannel Synthesizer Select
. Install jumper JU1 on the Digital Board to select
and enable the AM Multichannel Synthesizer with Frequency Select Handle.
Caution: Care must be exercised when reinstalling the synthesizer module on the Transmitter
Main board or the IF/Audio board
. Pay careful attention to pin alignment before
pressing the synthesizer module into its mating sockets.