AM Microtransmitter Running

Homebrew AM Microtransmitter, playing some music via a nearby radio.

The transmitter uses 3 PCL82 valves (tubes) and an EM87 ma Homebrew AM Microtransmitter, playing some music via a nearby radio.

The transmitter uses 3 PCL82 valves (tubes) and an EM87 magic eye. The transmitter is set up to broadcast the full audio spectrum (flat to better than 20kHz) though the radio in the video is not set up to receive a wide bandwidth.

The transmitter delivers the RF (~300kHz to ~2MHz) into a coaxial cable that is run around the house to a few small aerials, to avoid the RF causing interference to neighbours.

The radio is a Saba Freudenstadt 8 and the music playing is "Going to America" by Limousine.

For schematics etc go to
http://vintage-radio.net/forum/showthread.php?t=25624&page=5

(you may need to register to download the schematics)

Category:

Science & Technology

Tags:

• Homebrew
• electronics
• PCL82
• EM87
• AM
• Microtransmitter
• Saba
• Freudenstadt
• Valve
• Tube
• Electronics

[dominicbeesley]

It doesn't...if I make one efficient aerial it will cover a radius of about 5 miles (or would if I weren't in a valley). Having a number of small aerials allows me to cover each floor of a tall building with a signal only just strong enough for each floor without broadcasting to the whole town.

Dom

[dominicbeesley]

Hi,

I've added a link to one at the end of the description (click the more info link in the top-right).

I'll get together a website at some point soon and post stuff up there

Dom

[radiorob1]

Im confused, your transmitting into more than one aerial at he same time? How would this reduce interference?

[PhattyMo]

Nice! I like the eye-tube. Do you have a schematic?