FM stereo transmitter?

I suppose you can, but you have to worry about matching the antenna with the transmitter output to ensure that you minimize the reflection coefficient. From my experience, the output has an impedance of 50 ohms. Running a simple dipole antenna at about half or a quarter of a wavelength of the FM frequency can probably work, but some FM transmitters have a fold-back scheme. This means that if you don't have proper matching (high VSWR - voltage standing wave ratio), then the output power is cut back (folded back) to minimize the reflected power to the transmitter.

My friend had an iPod FM transmitter that was able to interfere with cars on the next lane. I guess he tweaked its power output. I wouldn't be surprised that most of the cheapo FM transmitter (iPod included) uses Maxim's MAX2605-2609 FM IC. You can request samples from Maxim and try building your own. The datasheet includes a basic FM application. I think with this one you can get away with running a long wire as your antenna and still receive decent field strength in your basement.

By the way, thanks for DaqGen. I'm using it as my signal generator for my audio experiments. :-)

Beware of the ones with LC oscillators as they drift like crazy and are junk.

It's usually not intentionally limited but the FCC limits what they can do. If the basement is almost underneath the living room and you don't have concrete floors above like we do it might work. A month ago I saw a modulator for $19.95 at Target. Thing is, these are limited to four frequencies at the low end of the FM band. So first you have to make sure that at least one of them isn't occupied by a strong station.

Ramsey is the go-to place for these small FM transmitters. Most available as kits, some also as assembled.

You are most welcome! As it turns out, I am putting the finishing touches on Daqarta for Windows. (Probably a couple more weeks until release.) I won't be developing DaqGen any more as a stand-alone app, since Daqarta includes all DaqGen's features plus a whole lot more. But even though Daqarta is shareware (not freeware), you will still be able to use it as a freeware generator since when the trial period expires all that happens is it no longer allows you to see inputs from the outside world... which DaqGen can't do anyway. You will be left with all the DaqGen features, plus all the new features from Daqarta (except inputs)... for free!

Best regards,

Bob Masta dqatechATdaqartaDOTcom D A Q A R T A Data AcQuisition And Real-Time Analysis

I have one of their FM kits. It's the one that is digitally tuned, about $100.00 I think. It works very well, no drift at all. The sound quality is great. ERS