Clarification needed:
The schematic below is for a DB25, I said it fits in DB9. This is correct except that pin numbers on DB9 are different.
See here:
http://picasaweb.google.com/ve4yz.alan/RS232TTL#5321286979431019122
-----Original Message----- From: Alan [mailto:ve4yz@mts.net] Sent: April 5, 2009 1:55 PM To: 'kq6ea@pacbell.net'; 'AMSAT BB'; 'Sebastian' Subject: RE: [amsat-bb] Re: Satellite Transceiver
TTL/RS232 for FT 736r.
You can fit it inside a DB9
I've used this circuit that uses a couple of 2N2222
http://www.mindspring.com/~n2wwd/html/body_doppler_compensation.html
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Jim Jerzycke Sent: April 5, 2009 1:18 PM To: AMSAT BB; Sebastian Subject: [amsat-bb] Re: Satellite Transceiver
IIRC, the IF-232 is just a simple TTL-to-RS232 interface.
it should be
fairly easy to homebrew on with any of the available chips
out there,
like the Maxxim MAX232. jim KQ6EA