Watch on spinneretsystems.tumblr.com

More modem madness!

Setup: Toshiba T3100e Laptop -> 1973 Acoustic Coupler Modem -> 70s phone -> Homebrew Intercom Box -> 70s phone -> Minicom TTD Terminal

5

Making progress on the acoustic coupler…

With these modems, the originating (caller) and the answering unit use different frequencies. Early models like this were hard-tuned so you would need one of each modem if you wanted to make and recieve calls, although in practice it doesn’t matter who makes the call as long as both modems used different tones.

So what I’m working out now is which capacitor and resistor I need to swap to tune it down by ~670Hz so I can use it in originate mode. My plan is to move the fuse holder inside the unit and mount a switch in its place to select between the new modes, while keeping the 70s look.

Text
Photo
Quote
Link
Chat
Audio
Video