Editor: Tony Redmond
Ph/Fax: 0264581402
PO Box 50
Bendoc 3888
Email: bendocpa@acr.net.au
Produced by the Bendoc Community House and Bendoc Progress
Association Inc
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Bendoc Wheel
Editor: Tony Redmond
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No Improvement to TV
On a wet rainy Monday night in July , at a Public Meeting held at Bendoc Hall, the community voted No to an improved TV Reception.
The main concern with the improved reception, was the interference the new reception may cause. Another point the community was concerned about was missing out on local news from Canberra.
The new service was to provide transmission from Imparja, Central West, ABC and SBS.
The Technican who had helped engineered a solution for the Blackspot TV Program for Bendoc sent the following email a day later after been thanked for his efforts :
TV Channels direct from the Black Mountain site in Canberra are:-
CTC7, ABC9, SBS28, WIN31 & WIN34
The above channels would not interfere with the proposed channels in
Bendoc as they are far removed from the proposed channels
WIN 60, IMP63, SBS66 & ABC69.
See attached Word.doc re "interference expected to receive" ( if interested please contact editor) any protection less than around 40dB on the Co-channel then households may experience line interference. It'll depend if the antennae they're using and if it is pointing at the far TV station or pointing away/to the side, plus the location. The table shows what is expected with an ordinary non-directional dipole antenna. Households have very directional antennae and the number of bars can see this on the antenna. At UHF if an 18 bar antenna then the antenna will have a gain of say 15dB.
This'll discriminate the Bendoc signal from the unwanted signal on the Co-channel unless the antenna is pointing in the same direction as the unwanted TV station and then the 15dB gain antenna will add 15dB to the unwanted station
i.e. if protection equals 55 subtract 15dB for the antenna used pointing
towards the unwanted TV station then that'll = 40.
If on the other hand the same antennae is pointing away at between
90/180 degrees from the unwanted TV station then the 15dB is added to the
protection dB and equals 70dB and with better protection. 40dB is threshold
and is an acceptable limit and within the ABA recommendation.
Imagine a torch beam as an antenna and the amount of light you see as it is rotated the full 360 degrees.
There is a SURVEY and an EXPRESSION of INTEREST in this issue of the Bendoc Wheel for the community to fill out and reply to in the interest of the community. Thank you for your time.