RFL 9785 - Receiver Downshifter Controls and Indicators

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
11.4 CONTROLS AND INDICATORS
Figure 11-3 shows the location of all controls and indicators on the Receiver Downshifter module.
These controls and indicators are described in Table 11-1. TP1, TP3, TP13, TP20 and R69 are
accessible with the module installed in the chassis. All all other controls are accessible only when the
module is removed from the chassis or is on a card extender.
Table 11-1. Controls and indicators, RFL9785 Receiver Downshifter Module
Component Name/ Function
Designator Description
J1 Jack Input signal attenuation adjustment in 10dB steps
J2 Jack High or low gain select for input signal
J3 Jack Test jack for loading and testing XILINX
RFL 9785 RFL Electronics Inc.
R10 Potentiometer Sets signal level into 2
nd
mixer
R15 Potentiometer Adjusts frequency of 5.12 mHz crystal oscillator
R28 Potentiometer Sets signal level into 3rd mixer
R69 Potentiometer Input signal gain adjust
SW1 DIP switch Sets 1
st
mixer oscillator frequency (selects channel frequency)
SW2 DIP switch Sets 1
st
mixer oscillator frequency (selects channel frequency)
TP1 Test point (black) Ground
TP2 Test point Input to 1
st
mixer
TP3 Test point (brown) Receiver Downshifter output
TP4 Test point Input to 2
nd
mixer
TP5 Test point Local oscillator for 1
st
mixer
TP6 Test point DC control signal for phase locked loop oscillator
TP7 Test point Unattenuated input to 3
rd
mixer
TP8 Test point Input to 3
rd
mixer
TP9 Test point Output of 3rd mixer
TP10 Test point Ground
TP11 Test point Local oscillator frequency of 3
rd
mixer (26 or 26.25 kHz)
TP12 Test point Output of 1
st
mixer
TP13 Test point (yellow) Gain adjusted input to downshifter
TP14 Test point Output of 2
nd
mixer
TP15 Test point Output of first input amplifier
TP16 Test point + 8Vdc
TP17 Test point + 5Vdc
TP18 Test point + 10Vdc
TP19 Test point Reference frequency for phase locked loop
TP20 Test point (white) Rx input high
June 18, 2009 11-5 (973) 334-3100