Page 1 of 1

AM Transmitter

Posted: Mon Apr 01, 2013 3:21 pm
by fireside
Good Morning all,
Looking for a solution for a raspi + am transmitter. I found great info on using the FM transmitter usb dongle, but it doesn't look like it can produce an AM signal. Anyone know of any micro AM transmitters that can be integrated with the Pi via soldering or otherwise? I've found several micro AM transmitter IC's and the likes, but unfortunately I'm not enough of an electrical engineer to understand if they could be used with the Pi. I know there are solutions available with the AM transmitter being in a separate box and all, but looking to keep things as small as possible and as close as possible in proximity to the Pi.

Thank you geniuses,

Re: AM Transmitter

Posted: Mon Apr 01, 2013 3:23 pm
by redhawk
What frequency operation range did you have in mind, and for what application is this for??

Richard S.

Re: AM Transmitter

Posted: Mon Apr 01, 2013 6:33 pm
by fireside
Ideally the broadcasting station could be tuned via software between 600 and 1600 khz on the AM radio dial. The idea is to use all the of Pi's power and flexibility to broadcast an AM radio signal to an old radio that has no line in jack, making the radio useful again and not just furniture. :D

Re: AM Transmitter

Posted: Thu Apr 04, 2013 7:37 pm
by fireside
I think one could be easily created using some of the guides found on the internet, but the question is, how do I integrate it to the RPi? Is there a place on the board that can be connected?

Re: AM Transmitter

Posted: Sun Oct 27, 2013 7:08 am
by jeff_w_brooktree
I searched for exactly the same thing since I need a way to feed custom audio to vintage or home built radios. Found this forum post while searching for a way to use the Pi as an AM transmitter. The FM transmitting thing works for sure. Propably it is possible to modify the FM transmitting software in a way that instead of shifting the frequency it uses a shift in amplitude and then select a frequency between 1 MHz and 1,6 MHz.
However I think the most effortless way to get things up and running is to go for this circuit: https://www.youtube.com/watch?v=_4-Sx-T6VBc
I found an optimal audio transformer here: http://www.thomann.de/gb/visaton_tr_84_uebertrager.htm
Propably this helps.