Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
RFL VF-15C RFL Electronics Inc.
August 7, 2012 15 (973)
334-3100
e. Wait 15 seconds for the RFL VF-15C module’s parameter settings to be loaded into the
shelf Common Module.
f. Pull the module out of the shelf and place DIP switch SW10-7 in the DOWN position.
Do not move SW10-8.
g. Slide the module back into the shelf.
h. Verify the module configuration through remote control by issuing a “CONFIG?”
query. See the Remote Control Interface section of this Instruction Data Sheet
for an explanation of the “CONFIG?” response.
i. Turn service on through remote control by issuing a “SRVC=ON” command.
The RFL VF-15C’s operating parameters can now be changed by remote
control. See the Remote Control Interface section of this Instruction Data
Sheet for more information.
j. Go to step 17.
17. On the Module Record Card located to the right of the shelf, record the channel bank type, time
slot, and any other pertinent information.
18. Verify that the signal levels are set for optimum performance as follows: If the input signal
level and desired output signal level are known, the level setting switches can be easily set as
described in step 9 on page 7. If the levels are not known, this paragraph will aid the user in
selecting the appropriate settings.
The two major purposes of the level switches is to:
1. make the best use of the dynamic range in the digital domain and
2. set the desired output level.
The VF-15C allows for low-level audio signals to be amplified prior to their conversion to
digital signals (A/D). Setting the level controls as described in Step 9 on page 7 will make use
of most of the available dynamic range in the digital domain. With maximum signal applied to
the unit, the signal level at TP-4 and TP-8 for channel 1 and channel 2 respectively should be
approximately 2.6 Vpp.
With the actual signal applied, measure the level at TP-4 for channel 1 or TP-8 for channel 2.
The objective is to provide a nominal 2.6 Vpp signal into the A/D. Therefore, the required
change in level setting is:
Level adjustment change (dB) = 20 log (2.6 Vpp/Vpp measured at TP-4 or TP-8)
Make the required adjustment to the Tx level setting and re-check the test point voltage.
After setting the transmit level, the receive side level adjustment can be varied to achieve the
desired output level.
The RFL VF-15C is now installed. If your multiplexer is set up for remote access and control, you can
now change the operating parameters of the module by using simple commands. For more information
on remote access and control, consult your multiplexer operation manual.
To Next Page
Loading...