[Elecraft] [K3] Loud audio blast on power up

[Mike Scott]

Something seems to have crept into the last firmware build that I don't
remember hearing before.
When I turn the rig on there is a momentary loud blast from the speakers. It
lasts maybe 250 milliseconds and then everything is normal. I get the
phenomena when in CW, data, SSB modes. I do not see it show up in AM. 

When I watch the filter display on the K3 front panel the bandwidth seems to
change in concert with the sound blast. For example if I am running SSB with
normalized bandwidth the K3 powers up with the filter narrower and then
shortly thereafter widens. 

I am running MCU 2.63 and DSP 01.95.

Mike Scott - AE6WA
Tarzana, CA (DM04 / near LA)
K3-100 #508/ KX1  #1311