Mahesh, all:
While the polcy does allow 250W in (supposedly) special circumstances,
for all practical purposes, DoT is allowing neither 250W ERP
transmission systems, nor repeaters. Both Hevalvani and KMVS had
requested 250W ERP permissions initially, given the terrain and
demographics that they have to deal with - but both were told to change
that to 100W ERP, as they were assured 250W would not be granted.
The issue of 107.8 MHz allotments, of course, defies all logic - and as
Sajan has noted, needs to be formally placed in front of I & B as
as an issue that needs urgent resolution. Two of the stations we are
working with, in Gurgaon (supported by TRF) and in Shivpuri (supported
by UNICEF through local partner Sambhav) have been allocated the same
frequency, and this has been a matter for much discussion between Nomad
and us. Being at the fag end of the commercial FM broadcast spectrum
(which ends at 108 MHz), a number of low cost autoscan radios are
unable to lock onto this even if the signal is reasonably strong. The
issues that Dr.Rego is facing compound and aggravate this, though it
would be worth examining where exactly the interference is coming from.
Unfrotunately getting a change of frequency once you are allotted one
is not a task for the faint hearted. And given that the primary process
itself takes so heart achingly long, to be faced with repeating part of
the process discourages most applicants from refusing the frequency.
Ram
N.Ramakrishnan
Director of Projects
Ideosync Media Combine
177, Ashoka Enclave III
Sector 35, Faridabad - 121 003
Haryana - India
Tel: +91-0129-4131883/4064883/4065883/6510156
Mobile: +91-9810273883
Web: www.ideosyncmedia.org
Vickram Crishna wrote:
I am also confident that Dr Rego's problem will be solved if the
station upgrades to 1,000,000 watts. In fact, every village and
community in India should immediately get radio transmitters of such
power.
Vickram
http://communicall.wordpress.com
http://vvcrishna.wordpress.com
From:
mahesh acharya <[email protected]>
To: Dr Richie Rego SJ
<[email protected]>
Cc: CR Forum
<[email protected]>
Sent: Friday, 4
September, 2009 11:16:18
Subject: Re:
[cr-india] on frequency
Dr. Richie,
I am confident that your problem will be solved if you upgrade to
250watts. Go for it! I look forward to hear the audio file. It will
give an idea of type of noise.
BEL, Bangalore manufactures 200-250watt FM transmitters, you may want
to get in touch with them.
regards,
mahesh
vu3mbv
On Thu, Sep 3, 2009 at 5:45 PM, Dr Richie
Rego SJ <[email protected]>
wrote:
Thank
you Mahesh for that enlightening information.
We use 50 watt Nomad transmitter, which is permitted by the Ministry in
normal circumstance. We have placed our antenna at a 30 mt height from
ground level; in addition, we have a good altitude. Ours is a dipole
antenna. As far as I understand, the output is good - but for the noise
and reception problem.
You are right, three FMs with AIR have preceded us. The interference is
experienced in many sets (if not uniformly and universally). We have
just completed technical audit.
I could not upload the audio for the CRS community to get an idea of
distortion.
Good wishes.
Dear Dr. Richie,
What is the transmitter output? and where is the transmitter located?
CR policy allows to use max 250watt transmitter.
However this will not assure that everybody will be able to hear the
broadcast (the receiver should be in broadcast zone) but will improve
the situation a bit.
The other option is to put repeater(s) where the signal reception is
poor. You will have to seek permission from Wireless Planning Commsn to
do this by building a strong case. (audio recording etc)
Some antenna basics
Omnidirectional Antenna's radiate power uniformally in all directions.
Other types of transmissions are unidirectional radiating more power in
one direction (usually the direction of antenna that is pointed). In
terms of range difference omni directional will have small range of
reception. Uni's range of rcption will b more.
Music systems in cars cannot recve the broadcast for the fact that they
do not have telescopic antenna (the ones u have on stand alone radio
sets) and since output of sarang may is in watts compared to kilowatts
(kilo=1000) mobile phones will not rcve the broadcast at all unless
they are very very close to transmitter.
Solution: Listeners will have to use telescopic antenna for the radio
in music system. Using headphones in mobile may improve the situation a
bit as headphones act as antenna.
Radio sets that are not able to recve good quality audio can be
improved if they point the telescopic antenna in the direction of the
transmitter.. Keeping the set near window will also help in some cases.
Regarding FM and AIR invading the freq, this may not be possible in all
the radio sets. Some poor quality radio sets will recve strongest
signals even though you have tuned to freq that you want to listen.
There is some degree of separation between freq's assigned by WPC and
thus some sets rcvng only FM and AIR may be true but not all. FM and
AIR were were already present b4 sarang was assigned the freq.
I could be wrong and in case all the radio sets are rcvng FM and AIR,
then the matter should be taken up with WPC and I am sure they will
look into it.
Hope this helps..
regards,
mahesh
vu3mbv
On Wed, Sep 2, 2009 at 10:57 PM, Dr Richie
Rego SJ <[email protected]>
wrote:
 |
|
Hi everyone!
I have a problem. Would like to know how you would deal with this - we
have 107.8 MHz frequency assigned to us. But low power radio sets and
mobiles cannot receive our radio signals even in nearby areas - car
stereo do. That means, local communities are deprived of our
transmission. People keep pleading us "increase signals" - they have
listened to our station sometime; they have read in newspapers. hence
their demand. We are unable because of the frequency. We checked why
this happens. The answer is 'frequency'. In addition - noise!
Besides, private FMs and AIR keep invading our frequency gloriously.
All Our efforts and people's desire doesn't seem to be bearing fruit.
How would be address this problem?
I will try uploading an audio piece recorded from our own transmitter
in our own campus & in the vicinity of the College. You can feel
the noise and difference.
If I succeed, the piece should be
available through my blog www.richardrego.wordpress.com
for you to get a taste.
TC
====================================
Rev Dr Richard Rego SJ
Director, SARANG SAC 107.8FM Community Radio
Head & Asst Prof., MCMS
Dept of Mass Communication
St Aloysius College; P.B. 720
Mangalore - 575003.
www.richardrego.wordpress.com
www.staloysiuscollege..wordpress.com
0824-2449706.
+919448546425. |
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