[Elecraft] K3 Firmware Rev. 2.76: No AF noise burst; PRE/ATTN independent for sub RX; etc.

[Christopher Kovacs]

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 k3support at 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
>>
>>
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>
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