[Elecraft] [K3] K3 beta firmware revision 3.14 now available

[pd0psb]

Clear Wayne, tnx.

I consider this a "don't try this at home" ;-)
Smart solution btw!

73'
Paul
PD0PSB




wayne burdick wrote:
> 
> Hi Paul,
> 
> Just plugging in a mono plug by itself is not detectable in firmware. 
> The protection kicks in as a result of a brief spike in AF amp current 
> drain. To observe this you need a mono plug, SPKRS=2, and moderate to 
> high volume setting with a strong signal in the passband. This will 
> eventually cause the AF amp chip to draw 1/2 to 1 amp of current on 
> peaks, which firmware can easily spot.
> 
> I wouldn't suggest forcing this condition intentionally. We tested it 
> on several K3s, and we know it works. But it is intended as a safety 
> feature, not as a substitute for using a stereo speaker plug when SPKRS 
> is set to 2.
> 
> 73,
> Wayne
> N6KR
> 
> On May 21, 2009, at 7:54 AM, pd0psb wrote:
> 
>>
>> Anybody else tested this?
>> I can't get speaker protection to work.
>> Or does it only work with higher AF levels?
>>
>> 73'
>> Paul
>> PD0PSB
>>
>>
>> MCU 3.14 / DSP 2.16  May 9, 2009
>>
>> * SPEAKER PROTECTION: If you’re set up for stereo speakers
>> (CONFIG:SPKRS = 2), but insert a mono speaker plug, the right
>> speaker output will be shorted to ground. This can cause excess
>> current drain if you turn volume up to high levels. The K3 now
>> detects this condition, automatically turning off the right
>> channel (and briefly flashing "SPRKS=1"). (It would be better,
>> of course, to use a stereo plug if you set SPKRS to 2, rather
>> than wait for the firmware to detect the mono plug.)
> 
> 
> ---
> 
> http://www.elecraft.com
> 
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> 
> 

-- 
View this message in context: http://n2.nabble.com/K3-beta-firmware-revision-3.14-now-available-tp2878791p2952720.html
Sent from the [K3] mailing list archive at Nabble.com.