[Elecraft] Re: Initial LCD Display Results

[wayne burdick]

Hi Mark,

This is all fine. I believe I set the default for preamp to ON for 40 
meters and up. The reason your changed preamp state isn't being saved 
is that this is one of the parameters that is not immediately updated 
in EEPROM; instead, its update is deferred until certain events take 
place, such as a band change.

To test this theory, change the preamp state, then change bands, *then* 
turn power off and back on, and return to the original band. Your 
selected state should now have been updated.

The reason we do it this way is to eliminate the need for a backup 
battery in the basic K2. Instead, many setup changes trigger a 
30-second "backup timer" (I described this somewhere in the manual). 
Whenever the firmware sees that you haven't made any changes for 30 
seconds, i.e. that the timer has counted down to 0, it updates 
everything in EEPROM, including the VFO A and B frequencies, etc., then 
turns the timer off until you make another control change.

73,
Wayne
N6KR

On Mar 15, 2005, at 7:51 PM, vze3v8dt at verizon.net wrote:

> Okay, here is my first post to the group during assembly/test.   This 
> seems minor and may not really be a problem, just want to make sure.  
> During the checks the first time the unit is powered up I get an 
> annunciator for "PRE".  It was not specified as such in the manual.  
> The "PRE/ATTN" button seems to work as it cycles relays and the 
> annunciator moves from "PRE" to "ATT" to "blank" and then back to 
> "PRE" again.  I haven't yet tested to see if the correct relay is 
> actually powered or not for each setting, however.  I also see that if 
> I turn the radio off it comes back on at whatever frequency I had last 
> left it, however if I also set the "PRE/ATT" to "blank" when I power 
> cycle it comes back on with "PRE".  Is this normal or is it a minor 
> bug I need to troubleshoot?

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