Elecraft K2ATOBKIT User Manual

1U 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, 2003In October, 2002, t

10AGC Threshold ControlR1 on the Control board sets the AGC threshold, whichalso establishes the K2's I.F. gain. On Rev.

11Supplemental Menu ParametersThe D I S P L A Y switch is used to access additionalparameters when editing certain menu entr

12BFO TestThe BFO will be tested in the following steps. Youshould do this test even if you did not make theTemperature Stabil

13VFO LinearizationThis procedure will be necessary if you installed newfirmware or if you installed the PLL Upgrade (or madeo

14Receiver Pre-Alignment, 10-30 metersThis step is necessary if you made any changes to the10-30 m band-pass filters (steps 4,

15Fine-Tuning Filter Settings You can optionally fine-tune your BFO settingsfor each mode by ear or by using a computer-basedt

2K2ATOBKT Mod Kit InventoryThe parts supplied with K2ATOBKT mod kit are listed below. Other mod kits referenced in Table 1 inc

31. Firmware Check and Parameter Save Determine what revision of firmware you have byturning the K2 on while pressing and hold

4Filter and BFO Settings (C A L F I L , Table 5)4: Before recording filter/BFO data, switch to any of the lower bands(160-1

52. PLL Frequency Stability at 7182 kHzWhenever the VFO is tuned to the 5 kHz band segmentcentered at about 7182 kHz, the PLL

63. Misc. RF Board ChangesThis step describes all RF board changes not coveredelsewhere. Parts can be found in K2ATOBKT. Turn

74. 15/17 m & 20/30 m Bandpass FiltersSee descriptions below. Band-pass filter realignmentwill be done following all hardw

86. VFO ALC & 10/12 m Bandpass FilterThis set of modifications enhances the VFO ALCcircuit and narrows the 10/12 m filter.

910. Misc. Control Board ChangesThese changes improve various operatingcharacteristics of the K2, as explained in each of thes