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 k3supp...@elecraft.com. 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 > > > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
