If an error has occurred or an incorrect channel is
entered, the LED will flash quickly for a second and
return to the previous settings.
To readback modulator channel assignment
(example: modulator is programmed to channel
)
108
Hold
button
while applying power
program
Led blinks
time and pauses
1
Led blinks
times
8
Led blinks
times, pauses
(“10” is read back as 0)
10
program
power
program
power
program
power
program
power
model 5415 digital modulator
model 5415 digital modulator
pll frequency control
pll frequency control
program
pwr
Valid Channels:
Channel Spacing:
Error indication:
Channel number
readback:
14-64:
UHF channels
65-125:
CATV channels
95-99:
not valid
Skip at least one number between channels.
Channels 14 and 16: OK.
Channels 14 and 15: Illegal.
A readback mode will display the current channel
assignments.
5
6
Things to watch for:
Herringbone interference on ChannelPlus channel (diagonal lines)
Herringbone interference on many channels (disappears when you
remove the modulator)
...
You may have chosen a channel number that is not completely vacant.
Distant UHF stations may be un-watchable, but will cause interference if
you try to try to create a new channel at the same frequency. Also, cable
companies often have extra signals where there should be none.
Try
moving the ChannelPlus channel to another number. You may have to add
a low pass filter to remove cable company noise.
… The high output of the ChannelPlus modulator
can overdrive many RF amplifiers. Reduce the RF output using an
attenuator. (ChannelPlus coax panels are designed to take the full output
of these modulators.)
No color on ChannelPlus channels … You may have chosen the
incorrect cable standard.
Not all televisions can accommodate the
1.25MHz frequency difference between the H and I cable standards.
No picture
Weak ChannelPlus UHF channel
Audio volume is low
… Verify that the video source is on and is producing a video
signal. Check that the TV and the modulator are tuned to the same channel.
For example, if the modulator is broadcasting on UHF channel 16, make
sure the TV is on UHF 16 rather than CATV 16. UHF 16 and CATV 16 are at
different frequencies.
… If the TV has a separate UHF input,
be sure that it is connected.
… The left and right audio inputs are combined for
monaural. For proper audio level, both right and left inputs must be used. If
you have a mono source, connect it to both right and left inputs using an
RCA ‘Y’ connector.
See
the section on programming.
