Where can I get a proper FM transmitter?

[eug k]

Phil Allison <philallison@tpg.com.au> wrote:

"eug k"
Phil Allison


Better think of a solution that's not illegal - like IR.

that's what we're using now, but needing line-of-sight limits where people
can sit.


** What the hell does that mean ???

You said it was a hall - not a catacomb.

the hall isn't a perfect square/rectangle, there are air conditioning
vents and support beams that prevent line of sight from the corner
where it's located. The range and dispersion angle of the transmitter
and limits as to where it can be placed affects the coverage too.

 

[eug k]

Phil Allison <philallison@tpg.com.au> wrote:

"eug k"

Low powered AM ( using a big loop to radiate the signal, possibly on
455
kHz) has a far better chance of working - assuming that each audience
member has a portable AM receiver and headphones.

I haven't listened to an AM radio for ages,


** You are a compete fuckwit - a complete fucking IDIOT !!!

sorry, i didn't know listening to AM radio was a requirement to not
be an idiot.


thanks anyway.

 

[eug k]

atec <"atec77(notspam)"@hotmail.com> wrote:

check in the ham groups , all you need is to surround the hall with a
multi strand induction loop , drive the loop with the audio out put from
a cheap transistor radio and the ear pieces should be simple hearing
aids.. google for more information , dead cheap and it works...

Neat.. just found some articles, dead simple.. but aren't hearing
aids really costly? building the receivers would take too much
time. I found a good induction loop receiver but woah, they're a
whopper at $399 each.



thanks

eug k wrote:

hi,

Does anyone know where I can get a proper FM transmitter? The only
one I've found is by Fordray, but it's a but pricey at $680. i'm
hoping to find one for around the $300-$450 mark. Range isn't very
important, it just needs to cover a hall that seats 600 people for
a translation system. Stability and clarity is important though.

This is the link to the fordray one:
http://www.fordray.com.au/Products/FMT2-10/fmt2-10.html

Perfect, but a bit over budget.

thanks

 

[Bill Bailley]

My suggestion. Go here http://www1.jaycar.com.au/ and search for kit KC
5341. This is a PLL locked micropower transmitter that can be set to any
of
8 different frequencies in the FM band. It will not drift off channel. As
it
is, this device may well do exactly enough for your purpose if centrally
located in the hall. If it doesn't quite manage, a small FM radio
distribution amplifier of 10 to 15 db gain to amplify the output should
be
all you need.

Hmm, have you tried it out? I'm a bit concerned about background hiss on
these cheaper units.

I have two of these units, without the FM line amplifier I mentioned. One is
connected to my TV audio out and is fully audible anywhere in my house with
no dropouts that I can find. The coverage extends nearly to the bottom of
the garden at approx 100ft from the unit. The audio has no hiss on it, and
the level, although a tad lower than regular FM, is entirely adequate. The
TX antennae is about a metre of wire dangled on the floor behind the TV. The
second unit is connected to the audio out on this computer and, with a
random length of wire about 6 metres long draped along the (hidden) side of
my house, gives me great reception of my Old Time Radio collection into the
workshop and to almost every part of the garden. The units are on different
channels.

Purists will say that you should use a band pass filter after the
amplifier,
and they are not wrong. However, if there is some space around the venue
then a few little RF spurs they will normally not bother anyone. Stress
on
the word little.

You may well get away with this project for Au$100 or so.

Just found the silicon chip article on the project, will have a read.
I probably should just pick one up and test it out, it's probably more
definite that way.


$49 sounds a lot for a kit seeing that ready-made products that (I'm
guessing) use the same IC go for $40ish.


thanks!

Are you sure you can afford it??? )

I suppose it is just faintly possible you may find it cheaper. You may need
to work the cost of phone calls and shoe leather into your evaluation of the
true cost. Postage will be $5 and up, so do your sums carefully!


To my way of thinking, if this TX was high over the centre of the auditorium
with a sensibly cut 1/4 wave dangler of very fine but flexible wire it would
do all you need. Yes, you have to get power and audio to it, but that is but
a tiny challenge in the greater scheme of things. Faint heart never . . . .
.. . . . . . . .

Secret tip coming up. Shhhhhh....... If you look at the output end of the
schematic, there may well be something to alter to help things along. Keep
it just between us.

Bill.

 

[atec]

eug k wrote:

atec <"atec77(notspam)"@hotmail.com> wrote:
check in the ham groups , all you need is to surround the hall with a
multi strand induction loop , drive the loop with the audio out put from
a cheap transistor radio and the ear pieces should be simple hearing
aids.. google for more information , dead cheap and it works...

Neat.. just found some articles, dead simple.. but aren't hearing
aids really costly? building the receivers would take too much
time. I found a good induction loop receiver but woah, they're a
whopper at $399 each.
local just fest I saw some at something like $10.00 each..

thanks

eug k wrote:

hi,

Does anyone know where I can get a proper FM transmitter? The only
one I've found is by Fordray, but it's a but pricey at $680. i'm
hoping to find one for around the $300-$450 mark. Range isn't very
important, it just needs to cover a hall that seats 600 people for
a translation system. Stability and clarity is important though.

This is the link to the fordray one:
http://www.fordray.com.au/Products/FMT2-10/fmt2-10.html

Perfect, but a bit over budget.

thanks

--
X-No-Archive: Yes

 

[Phil Allison]

"eug k" @bunyip.cc.uq.edu.au...

Phil Allison

Better think of a solution that's not illegal - like IR.

that's what we're using now, but needing line-of-sight limits where
people
can sit.


** What the hell does that mean ???

You said it was a hall - not a catacomb.

the hall isn't a perfect square/rectangle, there are air conditioning
vents and support beams that prevent line of sight from the corner
where it's located.

** Then find a better location for the IR transmitter - dickhead.

All you need is one spot, up the front, that all in the audience can see.




.............. Phil

 

[Phil Allison]

"eug k" @bunyip.cc.uq.edu.au...

Phil Allison
"

Low powered AM ( using a big loop to radiate the signal, possibly
on
455 kHz) has a far better chance of working - assuming that each
audience
member has a portable AM receiver and headphones.

I haven't listened to an AM radio for ages,


** You are a compete fuckwit - a complete fucking IDIOT !!!

sorry, i didn't know listening to AM radio was a requirement to not
be an idiot.

** Truth snipping, lying, anonymous, criminal imbecile.


You real name must be ** PUKE ** not eugk.




.......... Phil

 

[Phil Allison]

"atec"
..

check in the ham groups , all you need is to surround the hall with a
multi strand induction loop , drive the loop with the audio out put from
a cheap transistor radio and the ear pieces should be simple hearing
aids.. google for more information , dead cheap and it works...

** Absolute bullshit.

A tec is a fool.


........... Phil

 

[atec]

Phil Allison wrote:

"atec"
.
check in the ham groups , all you need is to surround the hall with a
multi strand induction loop , drive the loop with the audio out put from
a cheap transistor radio and the ear pieces should be simple hearing
aids.. google for more information , dead cheap and it works...



** Absolutly wonderful information .

A tec is a good bloke.

.......... Phil

--
X-No-Archive: Yes

 

[Phil Allison]

"atec" = hotmail moron.

Phil Allison

check in the ham groups , all you need is to surround the hall with a
multi strand induction loop , drive the loop with the audio out put
from
a cheap transistor radio and the ear pieces should be simple hearing
aids.. google for more information , dead cheap and it works...

** Absolute bullshit. A tec is an idiot.

You need an audio amp with serious power capacity to drive a large loop
while hearing aids with induction PUs are not cheap.





.......... Phil

 

[Phil Allison]

"Newsy"

After reading all the earlier posts I have to ask if you have considered
supplementing the existing IR
radiator with a second to increase coverage?

** Our Qld uni-puke ( "eug k" @bunyip.cc.uq.edu.au...) has no interest in
that idea - not when he can get us to help him do something illegal
instead.






.......... Phil

 

[Newsy]

After reading all the earlier posts I have to ask if you haqve considered
supplementing the existing IR
radiator with a second to increase coverage?
Rod

"eug k" <wired_au@change-this-to-ho.tmail.com> wrote in message
news:ch8bld$11$1@bunyip.cc.uq.edu.au...

hi,

Does anyone know where I can get a proper FM transmitter? The only
one I've found is by Fordray, but it's a but pricey at $680. i'm
hoping to find one for around the $300-$450 mark. Range isn't very
important, it just needs to cover a hall that seats 600 people for
a translation system. Stability and clarity is important though.

This is the link to the fordray one:
http://www.fordray.com.au/Products/FMT2-10/fmt2-10.html

Perfect, but a bit over budget.


thanks

 

[eug k]

Phil Allison <philallison@tpg.com.au> wrote:

"eug k" @bunyip.cc.uq.edu.au...
Phil Allison

Better think of a solution that's not illegal - like IR.

that's what we're using now, but needing line-of-sight limits where
people
can sit.


** What the hell does that mean ???

You said it was a hall - not a catacomb.

the hall isn't a perfect square/rectangle, there are air conditioning
vents and support beams that prevent line of sight from the corner
where it's located.


** Then find a better location for the IR transmitter - dickhead.

All you need is one spot, up the front, that all in the audience can see.

please note the last sentence in my post that you cut off in your
reply.

"The range and dispersion angle of the transmitter and limits as to
where it can be placed affects the coverage too."

we cannot just place it anywhere. And the dispersion angle vs distance
from the front to the back of the hall limits its effectiveness. Plus,
it's a high ceiling. If we had a better IR transmitter, it'd be more
viable. Unfortunately not everyone has a massive budget to buy all the
best things.

 

[eug k]

Newsy <rlg000atyahoo.com> wrote:

After reading all the earlier posts I have to ask if you haqve considered
supplementing the existing IR
radiator with a second to increase coverage?

it did cross my mind, but i was hoping to move away from IR as the
receivers are about $80-90 each. With an FM system, cheap radios can
be used. the IR transmitter itself isnt really cheap either.


thanks

Rod

"eug k" <wired_au@change-this-to-ho.tmail.com> wrote in message
news:ch8bld$11$1@bunyip.cc.uq.edu.au...
hi,

Does anyone know where I can get a proper FM transmitter? The only
one I've found is by Fordray, but it's a but pricey at $680. i'm
hoping to find one for around the $300-$450 mark. Range isn't very
important, it just needs to cover a hall that seats 600 people for
a translation system. Stability and clarity is important though.

This is the link to the fordray one:
http://www.fordray.com.au/Products/FMT2-10/fmt2-10.html

Perfect, but a bit over budget.


thanks

 

[eug k]

Phil Allison <philallison@tpg.com.au> wrote:

"Newsy"

After reading all the earlier posts I have to ask if you have considered
supplementing the existing IR
radiator with a second to increase coverage?


** Our Qld uni-puke ( "eug k" @bunyip.cc.uq.edu.au...) has no interest in
that idea - not when he can get us to help him do something illegal
instead.

have you ever driven at 41km/h in a 40 zone?

 

[Ken Taylor]

"eug k" <wired_au@change-this-to-ho.tmail.com> wrote in message
news:chr78v$jmb$2@bunyip.cc.uq.edu.au...

Newsy <rlg000atyahoo.com> wrote:
After reading all the earlier posts I have to ask if you haqve
considered
supplementing the existing IR
radiator with a second to increase coverage?

it did cross my mind, but i was hoping to move away from IR as the
receivers are about $80-90 each. With an FM system, cheap radios can
be used. the IR transmitter itself isnt really cheap either.


thanks

So you can use the more expensive system with the cheap receivers, or the

(relatively) cheap system with the expensive receivers. See a correlation?

Ken

 

[Phil Allison]

"puke k"

Phil Allison


the hall isn't a perfect square/rectangle, there are air conditioning
vents and support beams that prevent line of sight from the corner
where it's located.


** Then find a better location for the IR transmitter - dickhead.

All you need is one spot, up the front, that all in the audience can
see.

please note the last sentence in my post that you cut off in your
reply.

** Please respond to my above comment with something rational.

I live in hope.

we cannot just place it anywhere.

** All you need is one spot, up the front, that all in the audience can
see.

And the dispersion angle vs distance
from the front to the back of the hall limits its effectiveness. Plus,
it's a high ceiling. If we had a better IR transmitter, it'd be more
viable. Unfortunately not everyone has a massive budget to buy all the
best things.

** Bad luck - that never excuses doing what is illegal.

You, your associates and the owners of the hall could all wind up in court
if you go ahead with your FM transmitter idea.

It would be impossible to make a secret of it and one phone call to the
authority is all it takes to bring an inspector down.




.............. Phil

 

[Phil Allison]

"puke k"..

Phil Allison

"Newsy"

After reading all the earlier posts I have to ask if you have
considered
supplementing the existing IR
radiator with a second to increase coverage?


** Our Qld uni-puke ( "eug k" @bunyip.cc.uq.edu.au...) has no interest
in
that idea - not when he can get us to help him do something illegal
instead.

have you ever driven at 41km/h in a 40 zone?

** What an imbecile.

You, your associates and the owners of the hall could all wind up in court
if you go ahead with your FM transmitter idea.

It would be impossible to make a secret of it and one phone call to the
authority is all it takes to bring an inspector down.



........... Phil

 

[Phil Allison]

"eug k" @bunyip.cc.uq.edu.au...

Does anyone know where I can get a proper FM transmitter? The only
one I've found is by Fordray, but it's a but pricey at $680. i'm
hoping to find one for around the $300-$450 mark. Range isn't very
important, it just needs to cover a hall that seats 600 people for
a translation system. Stability and clarity is important though.

This is the link to the fordray one:
http://www.fordray.com.au/Products/FMT2-10/fmt2-10.html

** The penalties for using (or possesing for use ) such a Tx with no
licence are very severe:

" RADIOCOMMUNICATIONS ACT 1992 - SECT 46
Unlicensed operation of radiocommunications devices
(1)
Subject to section 49, a person must not operate a radiocommunications
device otherwise than as authorised by:

(a)
a spectrum licence; or
(b)
an apparatus licence; or
(c)
a class licence.
Penalty:

(a)
if the radiocommunications device is a radiocommunications
transmitter:
(i)
if the offender is an individual—imprisonment for 2 years; or
(ii)
otherwise—1,500 penalty units; or
(b)
if the radiocommunications device is not a radiocommunications
transmitter—20 penalty units.
(2)
Subsection (1) does not apply if the person has a reasonable excuse.

Note: A defendant bears an evidential burden in relation to the matter
in subsection (2) (see subsection 13.3(3) of the Criminal Code ). "






........ Phil

 

[Phil Allison]

"Wing Fong Wong"

I was just wondering and this is off topic and some might even cosider
this a stupid question, but are there any corresponding restriction on
recievers? I was once told that I shouldn't bother buying any radios from
overseas cos I can't use it here, I took it to mean not permitted to use
them here. Just wondering.

** You can easily buy a scanner radio from DSE, Andrews Communications or
elsewhere that picks up nearly everything that is transmitted by radio.

See: http://www.andrewscom.com.au/site-content-section-07.htm




.............. Phil