beautypg.com

Elecraft K2ATOBKIT User Manual

Elecraft Accessories communication

background image

1

U

P G R A D I N G T H E

E

L E C R A F T

K 2

T O R E V I S I O N

B

Rev. E, April 29, 2003

In October, 2002, the K2 transceiver was updated to incorporate many modifications that had been recommended by
Elecraft or our customers. Any Revision A K2 (or Revision XC, 1999 Field Test) can be brought up to Revision B by
making the changes listed in Table 1. K2s with serial numbers 3000 and higher already include all of the changes
(except the recent PLL Upgrade, which is also discussed in this document). To determine which revision of the K2 you
have, look at the RF board, near "ELECRAFT" label at the center.

Most of the items needed are supplied with the K2ATOBKT mod kit. Other mod kits and parts must be purchased
separately as indicated in the table; these kits come with their own modification instructions. Step 9 (AF GAIN control
modification) does not require a mod kit, but you'll still need to obtain the associated application note (see page 8).

If your present K2 firmware is older than revision 2.00A, you'll need a firmware upgrade (part # FWK2MCIO)
in addition to any hardware mod kits. New firmware installation and realignment will be done in steps 11 and
12, after
all desired hardware changes have been made. This ensures that calibration and test steps will only
have to be performed once.

Table 1. Modification Steps

Modification Steps (do in order)

Board(s)

Part #

Pg.

1. Firmware Revision Check and Parameter Save

RF

n/a

3

2. PLL Frequency Stability at 7182 kHz

RF

K2ATOBKT

5

3. Misc. RF Board Changes

RF

K2ATOBKT

6

4. 15/17 meter and 20/30 meter Band-pass Filters

RF

K2ATOBKT

7

5. BFO Temperature Stability

RF

BFOMDKT

7

5A. PLL Upgrade (Temperature compensated reference osc.)

RF

E850138

7

6. VFO ALC and 10/12 meter Band-pass Filter

RF

E850093

8

7. Second Crystal Filter Flatness

RF

XFILMDKT

8

8. First Crystal Filter Grounding

RF

n/a

8

9. AF GAIN Control Smoothness

All three

n/a

8

10. Misc. Control Board Changes

Control

K2ATOBKT

9

11. Firmware Installation

Control, RF

FWK2MCIO

10

12. Alignment and Test

Control, RF

n/a

10

13. Speaker Grille Cloth

n/a

E850089

15

NOTE: Not included are Rev. B board changes that accommodate the K60XV 60 meter adapter (RF board: VCO and
40-m low-pass filter). The K60XV manual describes these changes, which should not be made until the option is
installed. Also not included are minor changes that have no impact on operation or performance (for example, RF
board:
R60 bias pot changed to a fixed 100-ohm resistor; Control board: switch S1 changed to a jumper block, P7).