Firstly, get the maximum signal from the antenna itself by selecting the correct type for your area with the maximum number of dB. Note: Signal levels on channels 6-12 where used can be higher than the channels ≥27.
Cable losses increase as the cable gets longer and the channel number increases.
Amplifiers on this list can amplify the signal up to 25 000 times so overloading can occur if the antenna signal is too strong. This is where an antenna installer should measure the signal levels to ensure you can get the correct signal strength into the amplifier and into the receivers.
Excessive gain can remove the signals from the amplifier output or this can happen with impulse interference only. If this happens it is impossible to remove the interference from the signal. So to remove unwanted interference filtering is advised.
Band 3 174 - 230 MHz (RF channels 6 - 12)
Band 4 519 - 589 MHz (RF channels 27 - 36)
Band 5 582 - 820 MHz (RF channels 36 - 69)
After 2013 band 5 will be reduced to 582 - 694 MHz (RF channels 36 - 51). Two band 3 channels will be changed to DAB+ digital radio.
Band 3 174 - 230 MHz (RF channels 5 - 12)
Band 4 470 - 598 MHz (RF channel 21 - 35) = Au RF ch 20 - 36
Band 5 598 - 862 MHz (RF channel 36 - 64) = Au RF ch 37 - 75
Digital Dividend will sell 590 - 862 MHz (RF channel 56 - 64)
To remove all non Digital TV signals Kingray fl3bmh. Use the configuration on page 4 bottom left, position A
Since no Band 3 is used for NZ DTV, then a standard VU diplexer only using the U input will do the same job (except for UHF two way communications & pagers.)
It removes interference from impulse noise, AM, FM and CB radio (27 MHz and UHF), pagers and mobile phone repeater signals.
Where UHF antennas are designed to receive channels 21-27, this filter will remove UHF CB and mobile communications interference.
It must only be used in with a phased array in horizontal polarisation or the highest gain Yagi in Vertical polarisation. The signals must be very weak. The band 3 antenna needs to be fed into a Kingray fl3bmh followed by MHW42FS's V input (38 dB gain). Alternatively MHV44HLG contains a band 3 only input, it is not shielded and does not use F connectors.
Hills A3PU and include band 3 filter 30 dB gain.
MHU44B5G Internal filter passes channel 38-69, 38-62
MHU34FS Removes channels 20-27, 21-27
Johansson10MM-J40EF Amplifier 40dB Channels 45-69 (Matchmaster) 42 - 62
Bands 4 - 5
MHU24FS, MHU34FS or MHU42FS
Hills A2A 32 dB gain. Do not use the V input.
For the weakest signals only Kingray MHU44g
Band 3, 4-5
Not for NZ DTV
Use the Kingray fl3bmh or Johansson 09MM-HL12Fto remove any signals below channel 6. Note: the Johansson 09MM-HL12F does not remove the 470 - 519 MHz which is used for 2 way radio & UHF CB which the Kingray fl3bmh does.
Hills A2A 32 dB gain.
Johansson 10MM-J35BF Amplifier B3/UHF Channel range ? (Matchmaster)
Digimatch 10MM-MA24UP UHF channel range ? (Matchmaster)
Kingray also make Masthead distribution amplifiers MDA20H Frequency range 174 - 860 MHz. If there is strong 2 way radio or mobile phone interference a Kingray fl3bmh will be required between the antenna and MDA20H.
DJ Coulter, Matchmaster and Laceys sell the Kingray range and Jaycar, Dick Smith sells some models.
Please post errors and omissions here
Edited by alanh, 13 November 2010 - 12:31 AM.