BAMFORD TV AERIAL & SATELLITE SERVICES
Why Use Log Periodic Antenna?
The broadcast authorities use Log Periodic Aerials . They use them wherever possible, we use them at Bamford TV Aerial & Satellite Services whenever possible, and so should everyone else!
Below is a gain chart for a selection of high gain antenna, covering all of the channels(frequencies). As you can see the gains vary widely from frequency to frequency, meaning the aerial will give you different amounts of signal fron channel to channel on your TV. Reminds me of a roller coaster
Below is the gain chart for the Log Periodic 28 and 40 element antenna. Note the near flat response of each antenna, respectively. That means that when you switch from station to station on your TV at home the signal will be more equal, and losing channels is less likely. Note the signal drop off at channel 60 into minus Db gain avoiding 4G. (that is where 4G is ch 60-68)
These aerials are of BBC design but manufactured by Chelton electronics.
They are 48" long by 13" wide, with 30 elements and a gain of 6 to 8dBd.
These must be the most ruggedly constructed aerials around and are generally used for broadcasting but also by the military. And they should be well made, because these industrial Log Periodics used by the broadcast authorities weigh 5kg and cost around £500!
(right) TV relay station at Outbridge.
Log Periodics although optimum, do have a draw back insofar as the gain is not as high as other aerials. Where this is the case a low noise masthead amplifier should be used set on the lowest setting.
(right) Domestic Log Periodic Aerial
Most people in Rochdale are on the main transmitter, Winter Hill (group C/D Aerial) which carries the full range of services, around 140. However there are several relays that you may be using, including Littleborough (group A transmitter), Emley Moor (group B transmitter), Shaw (group B transmitter), Norden (group C/D transmitter), Wardle (group A transmitter), Whitworth (group A transmitter) and believe it or not SUTTON COALFIELD (from Wallbank in Whitworth) about 100 miles due south by my calculations.