For 140 specific outlets, even piped information is relatively inexpensive. The
cheapest setup here would be a line amplifier with line speakers (the horn kind
are very cheap, but even cone speakers, that give a better quality of sound,
are
not that much). The horn sound quality can be improved by placing them in a
gumla or other suitable clay vessel. Residents can run competitions to evolve
the best solution for themselves. It will also make sense to install a proper
station software to manage the schedule, such as GRINS.
Line voltage is 100V, so the wires need to be guided out of reach of children,
and properly insulated. Since most slums don't have legal roads, the only major
legal (municipal) objection may not be applicable. As an abundant precaution,
maybe the group should take a cable license from the nearest post office.
If mobility is needed (which may not be the case, from your description), 50mW
FM Txs can be attached (via a stepdown audio voltage transformer where
necessary. But it may be hard to find an open channel even for a limited
distance. It is also illegal, in case the Air Police ("We Keep The Airwaves
Free
of Nasty FM Radiation") passes by with their Chinese receivers switched on.
Once wiring is in place, residents can choose to enhance the system with 2-way
capabilities.
The drawback with such solutions is geo-expansion, while adding services is
likely to be incrementally quite inexpensive.
Vickram
http://communicall.wordpress.com
http://vvcrishna.wordpress.com
>
>From: sajan venniyoor <[email protected]>
>To: CR India <[email protected]>
>Cc: Vickram Crishna <[email protected]>
>Sent: Fri, 15 October, 2010 21:58:44
>Subject: Re: [cr-india] Chilean miners saved by leaky feeder
>
>Dear Vickram,
>
>
>A group from one of the ubiquitous bastis of Delhi (one of those -- to Sheila
>Dikshit's refined gaze -- unsightly settlements that were hidden behind large
>billboards during the Commonwealth Games) met me today and asked for a
>broadcast
>solution in their cramped basti: about 20,000 people living in a couple of sq
>kms.
>
>
>Since all the 'available' CR frequencies in Delhi have been handed over to
>media
>& management schools and other deserving communities, I told them that getting
>another CR license in Delhi would be next to impossible, and that we need to
>look for other solutions. Do you think a leaky feeder could be the answer? I
>think 1400 dwellings were mentioned, but I don't think that translates into
>more
>than a dozen very narrow alleys.
>
>
>Any other solutions you could suggest?
>
>
>Sajan
>
>
>
>
>On Fri, Oct 15, 2010 at 9:05 PM, Vickram Crishna <[email protected]> wrote:
>
>http://www.zdnet.co.uk/blogs/mixed-signals-10000051/chilean-miners-saved-by-leaky-feeder-10020755/?utm_source=feedburner&utm_medium=twitter&utm_campaign=Feed%3A+volweb%2FWRsA+%28News+from+openspectrum.info%29
>
>>
>>
>>One of the many applications that can be found for leaky feeder radio
circuits,
>>is providing a robust connection at multiple points in a mine.
>>
>>
>>Another is, of course, providing a grassroots community radio service using
>only
>>a standard cable adaptor and a deliberately damaged cable (that acts as a
leaky
>>feeder). It also takes a healthy attitude towards the development of rural
>>communities using ubiquitous media.
>>
>>
>> Vickram
>>http://communicall.wordpress.com
>>http://vvcrishna.wordpress.com
>>
>>
>>
>>
>>Join the Community Radio Forum. For membership details, please go to
>>www.crforum.in
>
Join the Community Radio Forum. For membership details, please go to
www.crforum.in
