I too still suffer from the notorious "pop" when powering on. I would
be interested if this change may help.
73, es happy holidays
Chris
Stewart Baker wrote:
On my K3 there is still quite a loud speaker 'pop' with Power On
and Off after loading firmware revision 2.76.
Looking at the NS data sheet for the audio amplifier IC shows that
it has click suppression built in. The length of the suppression
period is determined by the value of the capacitor on the Bypass
connection.The value of the bypass capacitor is related to the
input coupling capacitor.
On the K3 cct diagram this is shown as a 0.47uF, which suggests a
10uF be fitted to the Bypass connection to give a click mute
period of 0.4S. However, the K3 cct diagram shows a 3.3uF fitted,
which gives only 0.12S.
Any benefit increasing the value to 10uF ?
73
Stewart G3RXQ
On Tue, 23 Dec 2008 10:37:46 -0800, wayne burdick wrote:
K3 beta-test firmware revision 2.76 (with DSP rev 1.98) is now
available. See release notes below.
Please send any problem reports to [email protected]. For
instructions on how to load beta firmware, please see:
http://www.elecraft.com/K3/k3_software.htm
73,
Wayne
N6KR
* * *
MCU 2.76 / DSP 1.98, 12-21-2008
* POWER-ON AF NOISE BURST: This should now be eliminated.
* DIGIT 2 SWITCH TONE FEEDBACK RESTORED. The '2' key on the
numeric
keypad now provides tone feedback when used for numeric entry or
within
menu entries. There's no tone when it's used as "REV" (temporary
A/B VFO
reverse).
* SSB TX AFTER VFO A/B SWAP: Transmit filter settings are now
correct
after any A/B swap, regardless of the modes of VFO A and B. This
had
been
noted by some customers as a problem on power-up, but it could
occur
anytime the VFOs were in different modes at the time of an A/B
swap.
* INDEPENDENT PREAMP AND ATTN FOR SUB RECEIVER: The preamp
and attenuator settings for the receiver are now independent of
main.
On each band, you can set up the sub's preamp/attenuator as
desired
using BSET. The sub's preamp/attenuator are separate even in
diversity
mode, where you'll often be using a lower-gain antenna for the
sub
receiver.
Note: A second tap of A>B within the 2-second window still
copies all
main receiver settings to the sub, including preamp and
attenuator.
For software developers:
* "FR0" COMMAND (SPLIT CANCEL): Now correctly restores the VFO A
arrow
icon.
* CONFIG:KPA3 MENU ENTRY: The parameter for this menu entry is
now
accessible via the "MP" command.
* "FA"/"FB" commands and loss of PLL lock: Large FA/FB frequency
steps
were, on rare occasion, causing loss of PLL lock. This has been
corrected.
* Added "PA$" (sub RX preamp) and "RA$" (sub RX attenuator)
commands.
This is in conjunction with the sub preamp and attenuator
settings now
being independent of main (see above). During BSET, both return
"?;"
at present.
---
http://www.elecraft.com
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