FM TRANSMITTER: How would I go about amplifying the signal?

[John Kimble]

I have an IRock FM Transmitter.

Two Questions:

1.) I know the IRock has certain FCC limitations, but would it be possible to amplify the signal? (For educational purposes of course)

2.) How far could the signal be amplitfied do you think?




Thanks.

 

[Ian Stirling]

John Kimble <JohnKimble@johnkimble.com> wrote:

I have an IRock FM Transmitter.

Two Questions:

1.) I know the IRock has certain FCC limitations, but would it be possible to amplify the signal? (For educational purposes of course)

Yes.

2.) How far could the signal be amplitfied do you think?

Further than most commercial FM broadcasters.

 

[Jerry Greenberg]

If this transmitter is from a kit, or public schematic, there are
reasons for its low power rating. One of them is for the legal
aspects, and the other is for RF exposure factors.

It is possible to amplifier any RF signal, providing the coupling
match is correct, and the RF amplifier is the proper type and design
for the applicaion.

Signal strengths over a few hundred milliwatts start to be very
dangerious for health conserns, especialy if you are near to the
antenna. This is why there is a big concern now with the cordless and
cell phones.

If you start messing with high power RF amplifiers, the health effects
over the long run, can be questionable.


Jerry Greenberg
http://www.zoom-one.com

--


"John Kimble" <JohnKimble@JohnKimble.com> wrote in message news:<TzG8c.2018$I61.1153@fe2.columbus.rr.com>...

I have an IRock FM Transmitter.

Two Questions:

1.) I know the IRock has certain FCC limitations, but would it be possible to amplify the signal? (For educational purposes of course)

2.) How far could the signal be amplitfied do you think?




Thanks.

 

[Dan Mills]

Jerry Greenberg wrote:

If this transmitter is from a kit, or public schematic, there are
reasons for its low power rating. One of them is for the legal
aspects, and the other is for RF exposure factors.

It is possible to amplifier any RF signal, providing the coupling
match is correct, and the RF amplifier is the proper type and design
for the applicaion.

Indeed, but it is often more trouble then it is worth.... I would just buy a
decent kit for starters, a PLL controlled few watts in band II is readily
available as a kit and is not that hard to build.

Signal strengths over a few hundred milliwatts start to be very
dangerious for health conserns, especialy if you are near to the
antenna.

Cite please!

Remember we are in band II here and with a wavelength of around 3M the
diffraction limit will mean that even a few tens of watts should not
possibly be a problem. I will grant that touching the feedline when running
a few hundred watts tends to be rather noticable[1], but even there
radiated rf tends not to be a serious threat with very basic precautions.

Now up in the microwave bands where it is possible to produce silly power
density then the effects are possibly worth worrying about, but you should
not be playing up there unless you know what you are about. Do NOT look
down the waveguide with the maggie powered up.....

This is why there is a big concern now with the cordless and
cell phones.

No, the reason for the concern over cell phones, is that landsharks see a
lovely opertunity to make some money (and that joe six pack has forgotten
anything he ever knew about the inverse square law)!

Concern does not equal evidence, and most people are very bad at basic
statistics.

If you start messing with high power RF amplifiers, the health effects
over the long run, can be questionable.

Well, you can question anything you like but I would be more concerned with
BeO poisoning or simple electric shock then RF exposure when working on a
band II rig of below a few KW TPO (and this guy will not be playing in that
class).

Regards, Dan.

[1] You do this ONCE, then you learn (RF burns hurt and are slow to heal)
......
--
And on the evening of the first day, the lord said.... LX1, Go!
And there was light.
The email address *IS* valid, do not remove the spamblock.

 

[Watson A.Name - \"Watt Su]

"Jerry Greenberg" <jerryg50@hotmail.com> wrote in message
news:460a833b.0403251918.650c5e7b@posting.google.com...

If this transmitter is from a kit, or public schematic, there are
reasons for its low power rating. One of them is for the legal
aspects, and the other is for RF exposure factors.

It is possible to amplifier any RF signal, providing the coupling
match is correct, and the RF amplifier is the proper type and design
for the applicaion.

Signal strengths over a few hundred milliwatts start to be very
dangerious for health conserns, especialy if you are near to the
antenna. This is why there is a big concern now with the cordless and
cell phones.

If you start messing with high power RF amplifiers, the health effects
over the long run, can be questionable.

You don't know what you're talking about.

Jerry Greenberg
http://www.zoom-one.com

--


"John Kimble" <JohnKimble@JohnKimble.com> wrote in message
news:<TzG8c.2018$I61.1153@fe2.columbus.rr.com>...
I have an IRock FM Transmitter.

Two Questions:

1.) I know the IRock has certain FCC limitations, but would it be
possible to amplify the signal? (For educational purposes of course)

2.) How far could the signal be amplitfied do you think?




Thanks.