K2 Internal Mic Adaptor (IMA) User’s Guide – 23 July 2013
ii
Revision History
Date(s) Version
Revision(s)
Changes
23 JUL ’13 6 F
• Incorporated App Note #9 – “Six Jumpers Now Standard”.
•
Reoptimiazed the extra/spare jumper locations.
13 JUN ’13 6 E
• Added the Yaesu model MH-31B8.
• Revised the Elecraft
®
pin-out instructions. Func Pin-5 is essentially a spare.
•
Corrected the Yaesu MH-27 instructions; it was mistakenly listed in two places.
• Updated the description of the printed documentation (QSIS) that’s included with the kit.
12 AUG ’12
C
•
9 AUG ’12 6 B
•
Tweaked drawings and fixed broken links.
7 AUG ’12 6 A
• Added the Icom (iCOM) SM-30 and SM-50.
•
Added the Alinco EMS-3, EMS-14, EMS-53, EMS-55, EMS-56, and EMS-57.
25 JUL ’12 6 -
• Integrated app note 8 (onboard unused jumper storage locations).
•
Added AL7B’s “installed” photo and the Ten-Tec model 702.
4 MAY ’08
to
4 MAR ’10
5 A .. N
• Added WD8QWR’s “A-to-B mods” photo.
• Improved the External Bias circuit description as suggested by DF7TH.
to
4 A .. O
• Added four more “supported” microphones.
• Added the color-coded schematic.
to
3 A .. O
• Beta-test revisions.
to
2 A .. K
• Refined drafts.
to
1 A .. Y
• Preliminary drafts.
Table of Contents
Overview .................................................................................................................................................................................................. 1
Features ..................................................................................................................................................................................................... 2
Specifications ........................................................................................................................................................................................... 2
Limitations ............................................................................................................................................................................................... 2
Background .............................................................................................................................................................................................. 3
Introduction .............................................................................................................................................................................................. 4
Signal Routing – Circuit Description .................................................................................................................................................... 5
Assembly & Installation ......................................................................................................................................................................... 5
Configuration Instructions for Supported Microphones ..................................................................................................................... 6
Summary ................................................................................................................................................................................................. 11
Quick-Reference Decal ......................................................................................................................................................................... 12
External Bias – Circuit Description .................................................................................................................................................... 13
Schematic ............................................................................................................................................................................................... 15
PCB Renderings..................................................................................................................................................................................... 16
