Configuration
7.
Using the RFL 9508D NMS software set the Transceiver to generate a tone using the internal
generator with a frequency equal to center frequency of the filter.
a.
Enable RF Channel 1 and disable RF Channel 2.
b.
Set Channel 1 to upper side band (USB).
c.
Enable the Internal Generator in RF Channel 1, set sweep rate to 0 kHz/sec, and set the
frequency to 2kHz.
d.
Enable one (1) subchannel in RF Channel 1 Tx section, set subchannel filter to 300-3700
Hz pass band.
e.
Set RF Channel 1 Voice Atten. level for 0dB, Set RF Channel 1 Signaling level to -42dB.
f.
Set RF Channel 1 TX Frequency to the desired frequency -2kHz:
For example:To generate a 300kHz tone set TX Frequency = 300 - 2 = 298 kHz
g.
Set “TX Att Level” to 0 dB.
h.
Click on the write button. Do not save this configuration.
8.
Adjust L2 first, followed by L1 and L3 to have minimum loss at center frequency. The final level
measurement is called the OFFSET.
9.
Set TX Frequency according to step 7 to RX filter center frequency ±4 kHz for 8kHz bandwidth, or
±8kHz for 16kHz bandwidth.
a.
To balance the response adjust L2 to have the same level at ±4kHz for 8kHz bandwidth, or
±8 kHz for 16kHz bandwidth.
b.
The levels should be the OFFSET level ± 0.35 dB.
10.
Set TX Frequency according to step 7 to RX filter center frequency ±12 kHz for 8kHz
bandwidth, or ±18kHz for 16kHz bandwidth.
a.
Adjust L1 to get the desired attenuation at -12 kHz or -18 kHz for 16kHz bandwidth
•
At least 9.5 dB below the OFFSET level
b.
Adjust L3 to get the desired attenuation at +12 kHz or +18 kHz for 16kHz bandwidth
•
At least 9.5 dB below the OFFSET level.
11.
Verify the ripple in the passband is < 0.35 dB
.
12.
Turn off power to the AF & RF Chassis.
13.
Put the jumpers and switched back in their normal configuration for the line board, TX filter,
attenuator.
14.
Remove the RX filter from the extender and install the RX filter back into the chassis.
15.
Verify that all modules are seated securely.
16.
Using RFL 9508D NMS write the original configuration back.
17.
Your RX Filter is now tuned.
RFL 9508D UCC
RFL Electronics Inc.
May 27, 2011
5-42
(973) 334-3100
