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Subject Topic: FM transmitter for inside metal building Post ReplyPost New Topic
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Craig
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Joined: 26 January 2016
Location: New Zealand
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Posts: 2
Posted: 26 January 2016 at 5:55pm | IP Logged Quote Craig

Hey Guys, newbie here needing some technical info.

I'm an electronics installer (TVs, satellite, aerials, sound systems etc) and I've been asked by the local meatworks to sort a solution their issue as
follows....

1: Staff are allowed Radio Earmuffs, however they are inside the processing room (approx 30m x 15m) which is metal lined polystyrene walls so the FM signal
is awful.

2: They have an FM aerial on the roof, which runs to the office that overlooks the processing room.


My thoughts are to put in a radio receiver in the office (connected to the FM aerial) tune it to the preferred station and run the audio output into an FM
transmitter with an aerial mounted to the roof of the processing room. This can obviously be repeated for more stations.


Question Time

1: Where do I find a suitable FM transmitter?
(Had thought of the in-car FM transmitters for iPods etc - ridded to an external antenna...?)

2: Will the output antenna have to be an exact length for transmitting or will a generic FM antenna suffice?

3: What am I missing...?


Appreciate any help.


Thanks,

Craig


PS: I have pictures of the room if that helps anyone but cant post because: New member
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Craig
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Joined: 26 January 2016
Location: New Zealand
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Posts: 2
Posted: 09 February 2016 at 1:34pm | IP Logged Quote Craig

Anyone.....?

A transmitter that doesn't cost an arm....?
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RadioTech
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Joined: 09 August 2004
Location: New Zealand
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Posts: 244
Posted: 12 February 2016 at 7:13pm | IP Logged Quote RadioTech

Hi Craig,

Unfortunately it is not easy now to find good quality low power transmitters that meet NZ regs and are also cheap.

BW used to make some good modules but ceased after people in India cloned their products and sold them cheap on eBay.

Tennatron make a good transmitter but it's not as inexpensive as you probably want.
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traderbob
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Joined: 19 April 2009
Location: New Zealand
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Posts: 13
Posted: 11 September 2017 at 3:45pm | IP Logged Quote traderbob

I would try one of those car FM devices. They go a fair way, and in an enclosed space may do the job. Yes you need a tuned aerial but you can make a dipole out of wire that will work.
There are some el-cheapo rigs on-line which have a bit more grunt.
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