|
Reference |
Description |
Comment |
Complexity |
K2 Status |
Source |
|---|---|---|---|---|---|
Basic K2 Improved Performance |
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| Changed turns ratio on T7 on RF board | Changed from 11:3 to 20:5 from rev B to rev C manual. | Changes termination of X-tal filter for more gain esp. at low bandwidths | In Rev C manual (19 April 2000). | Elecraft | |
| Reduced no of turns on T3 (RF board) | Changed from 10 turns bifilar to 5 | Better efficiency of PA | In Rev C manual | W6EMD | |
| R18/19 in audio mute circuit (ctrl board) replaced by jumpers | Short out two resistors |
More audio gain |
All K2s after May 1999 |
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Caused by cycling of power for optical encoder combined with a position close to the border between counts. |
Important, but only required for firmware prior to 2.02E. |
Simple, just an installation of a strap. |
Recommended for firmware prior to 2.02E. Fixed in all K2s with serial numbers 2696 and above. |
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Some RF gets into current sense circuit on 160/80 m |
Simple to do (control board) |
Make C42 0.1 µF (100 nF) |
Included with K2s with S/N 2856 and higher |
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More accurate indication of RF output at higher frequencies |
Replace a diode and a resistor |
In all K2s some time before Aug. 2001 |
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Change control board R7 from 1.96k to 1.78k |
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In all K2s some time before Aug. 2001 |
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SSB Option KSB2 |
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Improve intermodulation distortion in PSK31 transmission |
Important improvement of PSK31 performance with no side effect on SSB performance |
Change 3 resistors and a capacitor |
Changed in all KSB2 kits shipped after Sept 5, 2001 |
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Items marked with × are implemented in my K2, while ¤ denotes modifications that I have tried, and then removed.
First version 8 Nov 2001, last update 16 May 2005.