How to use Wolfbane Reception predictor
People are forever asking me "what aerial do I need?" and "where should I position/point it?"
The Wolfbane site gives a reasonable prediction of what signal you can expect to receive, the compass bearing of each transmitter within range and other useful information. I've explained the column abbreviations, below. Read this, then click on the Wolfbane link, above, and enter your postcode. Use my information to interpret the results or contact an expert such as SatCure to interpret them for you.
Type in your aerial height and full postcode. Click (GO).
While analogue transmissions exist, they can interfere with digital reception. Read below...
For digital CP transmitter uses UHF 25, 22, 32, 28, 34, 29 (see digital chart above)
Compare these with the UHF channel numbers listed in this analogue chart. If any numbers matched up, that digital multiplex might not be receivable. In this example there are no matches. However, the analogue FIELD is a very high 86 which means that you must not use amplification, otherwise the analogue signal will "blind" the digital tuner.
Now let's look at a real example.
Although the predicted field strength is a healthy 50 dBuV/m, clicking on the yellow link gets us the terrain map, below:
There are hills in the signal path and, although this map doesn't show it, the hills are tree-covered. Tree leaves and branches have unpredictable effects on UHF signals, especially when the leaves are wet. It's likely that various frequencies are attenuated at different times of year. The height and lateral position of the aerial is critical and it will be necessary to try several positions and measure the signal for every channel in order to find the optimum position for all conditions. You can't simply assume that "highest is best". This could be a long-term project!