MFJ 1270B TNCs

This is a '1270C' but it's close enough. :)

• Configuration Notes for MFJ 1270B TNC
• Datasheets for the XR2206 & XR2211 chips in the MFJ1270Bs
• Warren Stirling's modes 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

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