- Configuration Notes for MFJ 1270B TNC
- Datasheets for the XR2206 & XR2211 chips in the MFJ1270Bs
- Warren Stirling’s mods for the MFJ 1270B – Equalise audio output level & other “gotchas”
- Description of TNC-2 & MFJ type Host Mode (Not Kantronics!)
Original by Paul T. Williamson, KB5MU, Updated by Peter Guelzow, DB2OS - MFJ Documentation for MFJ 1270C TNC
Adobe Acrobat Format (Note slightly different to 1270B) - TNC 2 – MFJ 1270 – Tone Calibration Procedure
Adapted from http://gyld.online.se/mods/misc/MFJ1270 - MFJ-1270B Electromagnetic Interference (And how to get rid of it)
Source: http://www.mods.dk/mods.php3?radio=tnc&model=mfj-1270&selectid=1073#1073 - 2400 Modem daughter board Manual & Circuit