Channel range: 27 – 36 (519 - 589 MHz)
I would have noted which antennas comply with Australian Standard for TV antennas AS 1417.1(Int)-2011. However none have done so, so far.
A guide to antenna selection
Please note that within this category antennas come in different sensitivities which I have tried to match to the colours used in the DBDE’s “My Switch” map.
From the manufacturers’ websites, I have selected the antennas which are designed for the above channel range. This maximises the reliability of the received signal. I have not included antennas which are designed to receive a wider range of channels.
The DBCDE has not released the signal strength range represented by each colour
1. Antenna specifications supplied by manufacturers often quote a maximum sensitivity for a particular channel and for other channels there is less sensitivity
2. With one exception the manufacturers do not specify If there sensitivity is referenced to an antenna which is equally sensitive in all directions in 3 dimensions or one which is sensitive in a figure of 8 direction pattern. This makes the first reference 2 dB less sensitive to that for a dipole.
3. The height of the antenna above the ground (up to 10 metres)
4. Surrounding obstructions and reflecting surfaces.
If there is any doubt the signal strength, carrier to noise ratio, uncorrected error rate and modulation error rates need to be measured with a digital field strength meter. All Digital Ready Endorsed installers have these meters. For reliable reception under virtually all conditions the readings must be better than the values in section 9 of Australian Standard 1367:2007 (ignoring the analog TV requirements).
Hills Hunter Mk2
Hills Ultimax 36
Firstly get the maximum signal from the antenna. You can then add a masthead amplifier to overcome the signal loss going down the cabling.
Amplifiers need to contain a filter to remove all signals except the ones you want.
These filters are unnecessary if the above amplifiers are used because they already contain the appropriate filters.
Matchmaster 10MM-J40BF, 10MM-J40DF or 10MM-J34BF
GME Kingray FL3BPMH Switch it to exclude VL
09MM-HL12F Diplexer Domestic catalog section 9.2 Use input 2 for band 3 and input 3 for band 4 & 5. Input 1 is not used.
The antenna signals are fed into one of the above filters/diplexers and then into a wideband amplifier such as
GME Kingray MHW34FE, MHW34FS or MHW42FS
In single dwellings splitters with F connectors are used to feed multiple outlets. A two way splitter halves the signal to each outlet as well as a small extra loss for the splitter itself. To overcome this loss a distribution amplifier can overcome this loss. For this channel range use a
[url="http://www.gme.net.au/products/matv/matv-distribution-amplifier/MDA20U"]MDA20U . If the distribution system is also carrying band 3 as well use the MDA20H instead
This amplifier is powered through the antenna cable, so the power inserter which is placed between the TV and the wall, must be connected to the splitter’s outlet called power pass. The above amplifier is then connected between the antenna and the splitter.
1. The need for this amplifier can be identified by using signal strength measurements above.
2. The signal strength meters in receivers are not very accurate.
Edited by alanh, 31 October 2011 - 11:38 PM.