NetMedia, Inc., 10940 N. Stallard Place, Tucson, Arizona 85737 (520) 544-4567 Fax: (520) 544-0800 Email: [email protected] www.netmedia.com
Q- How do I find out if the modulator is working when I can’t see it on any televisions?
A- Start with a basic setup: connect modulator to coax and coax to TV with no amplifiers, splitters, filters, cable boxes or other devices
involved. Set the modulator to a channel that matches the TV mode: 14-69 for Antenna tuning; 70-94 or 100-125 for Cable tuning. If
the TV can tune channel 70 or above, then it is probably in Cable tuning mode. Set a simple channel like 20 or 120 and look for it on
the TV. Check power, connections, cables, TV tuning mode, and modulator channel to correct any problems. You must see the
modulator output to confirm that it works in this basic setup before moving on to more complex setups.
Q- Why does the modulator or cable service picture go bad when the two are combined together?
A- The signals should be combined at the beginning of the distribution system before the cable service goes through any splitters. Make
sure you are not using any diplexers to split or combine. Once done, there is either interference or the signals are not balanced. Most
interference comes from invisible digital data that is on the line even when not subscribed to it. Set the modulator for a clear channel,
try 120, or use a filter to remove the digital/analog interference. When there is no interference you can balance the signals by
amplifying the weaker, snowy one before the two are combined. 10 to 20dBmV is usually enough, too much will degrade the other
signal.
Q- Can the modulator be combined with digital cable service?
A- Yes. The difficulty is in finding a clear channel for the modulator. The digital data usually takes up the analog channel range of 80-117
so channel 120 is a good place to start. Analog 120 on the TV will not conflict with digital 120 on the cable box. If you cannot find a
clear channel then you will have to use a notch or low pass filter on the cable service before you combine it with the modulator. Make
sure the filter does not remove any subscribed digital services including an Internet connection. If only one location is using the
digital services and it does not need to see the modulator, you can split its run off before the main line is filtered and combined with
the modulator. This prevents the filter from disrupting the digital data while enabling the modulator to appear on the rest of the
TV’s.
Q- How can I see the modulator when the TV uses a cable box?
A- There are a few ways but they all involve bypassing the cable box and using the TV tuner to see the modulator. Combine the
modulator with the cable service and check its picture by connecting the coax directly to the TV. Any splitters, filters, or amplifiers you
use for combining are separate from the ones used to bypass the cable box. After verifying the modulator picture, split the coax two
ways with one side going to the cable box. If you use the cable box S-Video or composite output then the other side of the splitter
goes directly to the TV. If you use the cable box coax output and there is only one coax input on the TV, then you must use a ch. 3/4
filter (included with NM-ACB3) and recombine the coaxes as shown in Figure 5. In any case, view the cable box through the
appropriate TV connection, Video 1, ANT 2, channel 3/4, then change the TV (not the cable box) to the modulator channel.
Figure 5 - Bypassing a digital or analog cable box and recombining to a single coax input on the TV. The filter
removes any conflict on channel 3 or 4. Switch TV from the cable box to the modulator channel.
Main cable or antenna
Splitter/
Combiner
Splitter/
Combiner
Filter
Cable Box
Television
Frequently Asked Questions
NetMedia Cable
Bypass/Combiner
Kit NM-ACB3
Modulator
Five Year Limited Warranty
NetMedia, Inc. warrants this product to be free from defects in materials and workmanship under normal use and service for Five Years
from the date of purchase or NetMedia will repair or, at its option, replace the defective product. Please keep your purchase receipt. In the
unlikely event that you need warranty service, call NetMedia at 1-520-544-4567 for a Return Material Authorization (RMA) number. Then,
return the product, with the RMA number clearly marked on the package, by a traceable method with freight pre-paid and accompanied
by a copy of the purchase receipt to:
Attn: Customer Service, NetMedia, Inc. 10940 N. Stallard Place, Tucson, AZ 85737-9527
No expressed or implied warranty is made for any defects in this product which result from accident, abuse, failure to operate the product
in accordance with relevant instructions, neglect, immersion in or exposure to chemicals or liquid, extreme climate, excessive wear and
tear and defect resulting from other extraneous causes such as unauthorized disassembly, repair and or modification. Any implied
warranty arising from the sale of this product, including implied warranties of merchantability and fitness for a particular purpose, are
limited to the warranty stated above. NetMedia shall not be responsible for any loss, damages or expenses, whether direct, consequential
or incidental that arise from the use or inability to use this product. Some states do not allow limitation of incidental or consequential
damages, so the above limitations and exclusions may not apply to you. This warranty gives you specific legal rights, and you may have
other rights, which vary from state to state.
