Anderson Jacobsen ADC 300 modem

From: Douglas Quebbeman <dhquebbeman_at_theestopinalgroup.com>
Date: Fri Oct 27 06:38:46 2000

> On a recent surplus hunt, I picked up an Anderson Jacobson
> ADC 300 baud acoustic coupler modem for $1. What a beauty - it's
> in a wooden box with a flip-top lid and a brushed aluminum
> interior panel. It has two DB-25 connectors, but one is used
> to feed *in* the AC power (!). I haven't disassembled it yet.
> I did a quick web search and one turns up in Megan Gentry's
> collection. How old is this? It's serial number 759.

Those are rather rare, in fact, it matches what I recall being
described as the first A-J model. I have a later one that'd
been through a flood and may be hosed; I paid $250 for it in
1980! It would go up to 600 baud using the Bell 202a encoding.

I learned how to whistle the carrier tone by playing with it.
I could not only whistle the carrier, but with a little
modulation, I could get garbage to display on the screen of
a connected terminal. Kept trying to learn to whistle "Hello"
but whistling ASCII ain't whistlin' Dixie...

;-)

-dq
Received on Fri Oct 27 2000 - 06:38:46 BST