[mcp6453]

As before, I know that this group is a professional one, which is why I
am asking this question here.

Presently I use a Monstor FM transmitter for my MP3 player in my car.
Not only does it have a limited number of frequencies, and the input
sensitivity is low, but also the output power is too low. Every
available frequency on the unit has carrier in my location. Can anyone
recommend a decent unit for transmitting to a car radio? I'm not
interested in an exciter...

[g]

In article , mcp6453 wrote:
As before, I know that this group is a professional one, which is why I
am asking this question here.

Presently I use a Monstor FM transmitter for my MP3 player in my car.
Not only does it have a limited number of frequencies, and the input
sensitivity is low, but also the output power is too low. Every
available frequency on the unit has carrier in my location. Can anyone
recommend a decent unit for transmitting to a car radio? I'm not
interested in an exciter...

Input sensitivity hads to be low so it does not overmodulate. The only one I
am familiar with is one that only has two freqs, and has a direct connection
into the antenna lead. Its hardwired in my truck. I imagine if
one wanted beter S/N they could disconnect the antenna and go direct feed.
Other than that, I can't be of much help. The only good way is to use direct
feed into the HU or amp audio chain.

greg

[Scott Dorsey]

mcp6453 wrote:

Presently I use a Monstor FM transmitter for my MP3 player in my car.
Not only does it have a limited number of frequencies, and the input
sensitivity is low, but also the output power is too low. Every
available frequency on the unit has carrier in my location. Can anyone
recommend a decent unit for transmitting to a car radio? I'm not
interested in an exciter...

Problem is that this is about what the FCC allows. Yes, there are devices
by Ramsey and Panaxis which will go a lot farther, and they aren't legal,
and the NAB is getting ****ed about it.

There are a few, though, that will tune pretty much the whole FM band,
Note that all of these devices pretty much universally use the same BA1404
chip from Rohm, so the sound quality isn't going to vary much from unit to
unit.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[mcp6453]

Tim Perry wrote:

Better yet listen to the radio! (admittedly I have a vested interest)

I not THAT desperate. (I used to be in the radio business.)

[mcp6453]

Scott Dorsey wrote:

mcp6453 wrote:
Presently I use a Monstor FM transmitter for my MP3 player in my car.
Not only does it have a limited number of frequencies, and the input
sensitivity is low, but also the output power is too low. Every
available frequency on the unit has carrier in my location. Can anyone
recommend a decent unit for transmitting to a car radio? I'm not
interested in an exciter...

Problem is that this is about what the FCC allows. Yes, there are devices
by Ramsey and Panaxis which will go a lot farther, and they aren't legal,
and the NAB is getting ****ed about it.

There are a few, though, that will tune pretty much the whole FM band,
Note that all of these devices pretty much universally use the same BA1404
chip from Rohm, so the sound quality isn't going to vary much from unit to
unit.

Couldn't care less about the NAB. The FCC is another story, however.

I was afraid these things are using the same RF modules. There is
clearly some crossover distortion in this Monster-brand unit indicating
that there is likely a biasing issue in the audio input circuit.

There is a hardwire unit on eBay that purports to connect in place of
the CD changer that my car does not have. If I can get the seller
(autoware302) to respond to my email and confirm that it works with my
radio, my initial problem is solved.

[Scott Dorsey]

In article ,
mcp6453 wrote:
Scott Dorsey wrote:

mcp6453 wrote:
Presently I use a Monstor FM transmitter for my MP3 player in my car.
Not only does it have a limited number of frequencies, and the input
sensitivity is low, but also the output power is too low. Every
available frequency on the unit has carrier in my location. Can anyone
recommend a decent unit for transmitting to a car radio? I'm not
interested in an exciter...

Problem is that this is about what the FCC allows. Yes, there are devices
by Ramsey and Panaxis which will go a lot farther, and they aren't legal,
and the NAB is getting ****ed about it.

There are a few, though, that will tune pretty much the whole FM band,
Note that all of these devices pretty much universally use the same BA1404
chip from Rohm, so the sound quality isn't going to vary much from unit to
unit.

Couldn't care less about the NAB. The FCC is another story, however.

Oh, nobody cares about the FCC. They have no enforcement division left
any more, and what they have left is too busy hunting down pirates to
bother with vendors selling patently illegal products. The FM transmitters
are a drop in the bucket compared with the computers, touch lamps, and
other products that violate Part 15.

I was afraid these things are using the same RF modules. There is
clearly some crossover distortion in this Monster-brand unit indicating
that there is likely a biasing issue in the audio input circuit.

It would not surprise me. Also, the pilot tone generator on the chip
produces something that looks like a triangle wave. I'm sure the harmonics
all fall way up in the SCA area, but it still can't be good.

There is a hardwire unit on eBay that purports to connect in place of
the CD changer that my car does not have. If I can get the seller
(autoware302) to respond to my email and confirm that it works with my
radio, my initial problem is solved.

This is the real solution. Actually, such things should be available for a
lot of radios. The rec.audio.car guys will know, as will Crutchfield.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[Matt Ion]

mcp6453 wrote:
As before, I know that this group is a professional one, which is why I
am asking this question here.

Presently I use a Monstor FM transmitter for my MP3 player in my car.
Not only does it have a limited number of frequencies, and the input
sensitivity is low, but also the output power is too low. Every
available frequency on the unit has carrier in my location. Can anyone
recommend a decent unit for transmitting to a car radio? I'm not
interested in an exciter...

I use a Belkin unit, it will tune the entire FM band.