NM-CNF7080 RF Notch Filter - NetMedia

RF Notch Filter
NM-CNF7080 Removes Cable Channels 70-80
The NetMedia CNF7080 RF Notch Filter removes cable channels 70-80 (UHF 19-29) to allow insertion of up to 6
custom modulated sources (ch. 70, 72, 74, 76, 78, 80). This range is ideal for deletion because it has the fewest
analog channels and does not typically interfere with digital services. The filter also prevents the modulated
channels (70-80) from backfeeding through the cable system into neighbor’s televisions.
Product Includes:
1. NetMedia Notch Filter
Male F-Connector
Functions as input or output,
provides easy connection to coax.
Female F-Connector
Functions as input or output, provides
easy connection to splitter/combiner,
amplifier, or distribution panel.
Modulator
Set for channels
from 70 to 80
Splitter/
Combiner
Distribution
Panel
or Splitter
Camera
Television
FEATURES
Main cable or
antenna
Makes room for 6 modulated channels
Works with two NetMedia TriplePlays
Keeps modulator signals from neighbors
Bi-directional, passes DC power
Deletes UHF and CABLE channels
1 year limited warranty
CNF7080 Notch Filter
Removes CABLE 70 to 80
and UHF 19-29
Figure 1 - Connecting the filter to an antenna or cable service for modulator distribution to multiple televisions.
SPECIFICATIONS
Filtered Frequencies:
Filtered Channels:
Filter Slope:
Input/Output Connectors:
Cable Type:
Size:
Weight:
Television
498MHz to 564MHz
CABLE 70-80, UHF 19-29
5 channels on either side
1 Male and 1 Female F, 75 Ohm
Coax such as RG59 or RG6
0.8“ dia. x 2.25” long
1.5 oz.
(subject to change without notice)
NM-CNF7080
NetMedia, Inc., 10940 N. Stallard Place, Tucson, Arizona 85737 (520) 544-4567 Fax: (520) 544-0800 Email: sales@netmedia.com www.netmedia.com
MAN-CNF7080
REV0703A

One Year Limited Warranty
NetMedia, Inc. warrants this product to be free from defects in materials and workmanship under normal use and service
for One Year 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.
Frequently Asked Questions
Q- I connected the filter but why does the cable service look good until I combine it with the modulator?
A- The filter should be applied to the antenna or cable service before the signals are combined at the beginning of the
distribution system. Make sure you are not using any satellite diplexers to split or combine. If one of the signals still looks
snowy then it probably needs amplification. Amplify it after the filter but before the signals are combined. +10 to
+20dBmV is usually enough, too much will degrade the other signal.
Q- Can this filter be used with digital cable service?
A- Yes. The digital data usually starts in the 80’s which is above this filter’s range. Expect to lose analog channels from
around 68-82 but check all subscribed digital services including an Internet connection after it is installed.
Q- Does this filter help modulator signals bypass and combine with cable box signals?
A- No. Any splitters, amplifiers or filters (like this one) that you use for combining signals together are separate from the
ones used to bypass the cable box. First, verify that the modulator and cable signals look good by connecting the coax
directly to the TV with the TV’s tuner. Then, to bypass a cable box, split the coax two ways with one side going to the
cable box. If you use the cable box S-Video, composite, or component A/V outputs 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 2. 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 modulated channels. You must repeat this process for every cable box.
Modulator
Cable Box
Main cable or antenna
Splitter/
Combiner
NM-CNF7080 Ch. 70-80 Notch Filter
The notch filter does not bypass the cable box.
NetMedia Cable Box
Bypass/Combiner
Kit NM-ACB3
The kit filter does not
make clear channels
for the modulator.
Television
Figure 2 - Bypassing a digital or analog cable box and recombining to a single coax input on the TV. The NM-ACB3
filter removes any conflict with the cable box on channel 3 or 4. The NM-CNF7080 filter removes any
conflict with the cable service on channels 70-80. Switch the TV from the cable box channel (3 or 4) to
the modulated channels (70-80).
NM-CNF7080
NetMedia, Inc., 10940 N. Stallard Place, Tucson, Arizona 85737 (520) 544-4567 Fax: (520) 544-0800 Email: sales@netmedia.com www.netmedia.com
MAN-CNF7080
REV0703A