Problems with the signal? The 4G/LTE 800MHz network is now in use. Unfortunately this may cause some problems for TV reception.
At Kjaerulff 1 Digital we offer a full range of products that can help solve these problems. Just look for the 4G icon.
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The potential problem With the introduction of the 4G network also called LTE major changes has happened for TV transmission and reception. Both for digital terrestrial TV (DVB-T) and cable TV (DVB-C). 4G or LTE is a mobile broadband Internet transmitted on frequencies 800, 1800 and 2600 MHz. The 800 MHz frequency transmission is using channels 61-69. Channels that has previously been reserved for TV broadcasts. If the end user experiences problems with the TV reception - ranging from pixelating to missing channels or completely black screen - it is possible that a 4G transmission is interfering with the TV signal. To solve the problem the TV signal installation needs to be updated with equipment that has been optimized to filter the 4G signal out. dB
Adjusted LTE
DVB-T antenna
LTE filter 470 21
790 791 60 61
862 69
MHz Channel
DVB-C DVB-T (previously) DVB-T (now) 1 MHz separates DVB-T & 4G 4G/LTE, 800 MHz
DVB-T will from now on only use channels 21-60 for TV transmissions. Most DVB-T equipment in the market is designed for CH 21-69 reception, making it vulnerable to interference from the 4G transmission, since it may receive signals that it is not designed to use. That makes it very important use equipment that has been optimized to filter out 4G transmission from the TV signal. The technical quality of these products must be very high and field tested locally to ensure the right functionality. One reason is that the gap between the 4G and DVB-T signals is very small, making it essential that the equipment is very precise. For DVB-C the problem is slightly different. DVB-C will still use CH 21-69 for TV broadcast. Using the same frequencies for both 4G and DVB-C is possible because DVB-C operates in a closed network. This however, makes it essential that the DVB-C network is indeed closed and is shielded to keep out interference from 4G transmissions. This means that the complete DVB-C signal path must be shielded from reception to tuner.
The solutions Basically the solution is protect the TV signal from the 4G signal. In order for the solution to be effective the whole signal path from point of reception to tuner has to be protected. In practice this mean that antennas, filters, amplifiers, cables and connections all have to be designed to filter the 4G signal out. Many of the MAXIMUM products can help solve the problems with the 4G signals. We have marked them with our �4G/LTE STOP� icon. These products have all been tested to ensure optimal TV reception and keeping the TV signal safe from the 4G signals. Even in areas with strong 4G signals.
Antennas DVB-T antennas are traditionally designed to receive CH 21-69, and will by design receive the interfering 4G signal. At Kjaerulff 1 we offer the technically preferable solution to limit the signal to CH 21-60: A quality passive DVB-T antenna combined with a filter, that filters out the interfering 4G signal at the point reception.
MAXIMUM UHF-14 LTE
MAXIMUM UHF-4 Grid LTE
MAXIMUM UHF-200 LTE
MAXIMUM UHF-14. MAXIMUM LTE filter XO-S2.
MAXIMUM UHF-4 Grid. MAXIMUM LTE filter XO-S2.
MAXIMUM UHF-200. MAXIMUM LTE filter XO-S2.
Item no.: 20621
Item no.: 20626
MAXIMUM Combo-212 VHF/UHF LTE
Item no.: 19225
Item no.: 20231
MAXIMUM COMBO-212 VHF/UHF. MAXIMUM LTE filter XO-S2.
Filters Filters play the most important role in interference free reception of DVB-T. Since DVB-T and 4G are transmitted technically very close, with only 1MHz separation, it is essential to use filters in high quality that are truly capable of separating the DVB-T and 4G signals sharply and efficiently. From a production point of view these filters are difficult to fine tune to separate the frequencies that close efficiently. So at Kjaerulff 1 we only offer filters in highest quality.
MAXIMUM XO-C3 Combiner
MAXIMUM XO-S1 Stop Filter
Input for 3 antennas. 2 x VHF/UHF. 1 x FM. Shielded for LTE and NMT.
LTE/NMT Stop Filter. Attenuation: 32 dB @ 450 MHz. Attenuation: 20 dB @ 800 MHz. Attenuation: 32 dB @ 820 MHz. Mast mount design.
Item no.: 18070
Item no.: 18080
MAXIMUM XO-S2 Stop Filter Item no.: 18081
Attenuation: 24 dB @ 800 MHz. Attenuation: >50 dB @ 820 MHz. Cylinder design.
Amplifiers In many installations an amplifier is necessary to ensure a sufficiently strong signal. With the introduction of 4G it is necessary to use an amplifier with a built-in filter. If amplifiers without the filters are used it is likely to make the problem even worse, because the amplifier will also amplify the interfering 4G signal.
MAXIMUM XO-A2sa Amplifier
MAXIMUM XO-A1sa Amplifier
Input for two antennas VHF/UHF (switchable). Gain: 7-22 dB adjustable. Attenuation: 20 dB @ 800 MHz, 32 dB @ 820 MHz. Mast mount design. Shielded for LTE and NMT.
Input for one antenna VHF/UHF (switchable). Gain: 7-22 dB adjustable. Attenuation: 20 dB @ 800 MHz, 32 dB @ 820 MHz. Mast mount design. Shielded for LTE and NMT.
Item no.: 18060
Item no.: 18061
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Connectors The points of connections are critical, because they are most likely to be open to interference. Either if the connectors are not mounted correctly or if they are not High Frequency shielded. Therefor it is most important to use HF shielded connectors at every connection point along the signal path. And of cause mount them correctly. At Kjaerulff 1 we offer a variety of HF shielded connectors.
PPC CMP59 F-conn. – red
PPC CMP6-49 F-conn. – blue
PPC CMP6-51 F-conn. – grey
5.6 mm cable.
6.6 mm cable.
6.7 mm cable.
Item no.: 23803
Item no.: 23805
Item no.: 23807
PPC EX6XL F-conn. Item no.: 23825
PPC EX6XL F-conn. aqua tight – black
7.3 mm cable (jordcable).
Item no.: 23819 / 23820
F-connector – 90° angle
F-connector – IEC
5.6 mm cable (#23819). 6.6 mm cable (#23820).
F-connector – self install
F-connector – joiner
5.6 mm cable (black) (#2266). 6.6/6.7 mm cable (blue) (#2270).
5.6 - 7.3 mm cable.
F-connector – IEC
IEC – self install
PPC EX59 IEC
PPC EX6 IEC
6.6 mm cable.
5.6 mm cable (m) (#23821). 5.6 mm cable (f) (#23822).
6.6 mm cable (m) (#23823). 6.6 mm cable (f) (#23824).
Item no.: 2266 / 2270
Item no.: 1814 (m) / 1818 (f)
Item no.: 1831
Item no.: 2275 (m) / 2276 (f)
Item no.: 1839
Item no.: 23821 / 23822
Item no.: 70198 (m) / 70199 (f)
Item no.: 23823 / 23824
Cables Cables with high quality shielding is essential to keep the TV signal free from interference when transporting from one point to another. Class A quality cables should be used at a minimum. It is important to use a quality cable that has a uniform performance and shielding for the entire cable length.
MAXIMUM N46 – white
MAXIMUM NAP48/PE – black
6.6 mm cable. 100 m spool.
7.3 mm cable. 100 m spool.
Item no.: 32015
Item no.: 32065
MAXIMUM N48 – white Item no.: 32030 6.7 mm cable. 100 m spool.
For full assortment please visit www.kjaerulff1.com
N46 N48 NAP48
Kjaerulff 1 Digital A/S
C. F. Tietgens Boulevard 19 • DK-5220 Odense SØ Tel.: 66 13 54 80 • Fax: 66 13 54 10 www.kjaerulff1.com