[Elecraft] K3 after turning on doesn't receive or transmit

[Dave Cole (NK7Z)]

I understand why, I was just not aware the K3 needed to be actually shut 
down explicitly.

I tend to never pull power from anything running anyway, (too many years 
doing PC, and dedicated hardware support in broadcast), but I was 
totally unaware the K3 needed a shutdown sequence...

In fact my shack desk has a dedicated 12 V power setup, which lives on 
the back of the desk, so I can't get to the switch without reaching 
behind the desk...

What a surprise!  I guess I need to re-read the manuals!  I missed that 
in both manuals!

73s and thanks,
Dave
NK7Z
http://www.nk7z.net

On 10/13/2017 01:35 PM, Mark E. Musick wrote:
> Yes Dave, it is true.
> These days with most radios using some sort of microprocessor you should turn all brands off, not just Elecraft, using the power switch on the radio, not the switch on the power supply. This allows the processor inside the radio to save parameters etc. to memory and go through an orderly shutdown before it actually shuts power off to the radio. If you shut off the radio by turning it off using the power switch on the power supply the processor does not go through its orderly shutdown and you can scramble the processors brain. When you turn it on again you don't know what state it will power up in. If it powers up correctly, you were lucky.
> Shut the radio off using its front panel switch first, then shut the power supply off.
> 
> 73,
> Mark, WB9CIF
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Dave Cole (NK7Z)
> Sent: Friday, October 13, 2017 8:00 PM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3 after turning on doesn't receive or transmit
> 
> Respectfully, is that really true?  The K3 needs to be shutdown via the Power switch due to some sort of shutdown procedure, (or internal timings issue), within the radio?
> 
> 73s and thanks,
> Dave
> NK7Z
> http://www.nk7z.net
> 
> On 10/13/2017 11:52 AM, Bob McGraw K4TAX wrote:
>> I would also comment with Knut, AB2TC, that one must always turn the
>> radio on and off with the power switch.  This allows the internal
>> workings to store the data.   If you use a "master station switch"
>> thus just dump the power supply then the radio may not store the data
>> as required.   I recall the term "power down imminent" or PDI.
>>
>> Years ago we had "the big switch" which was used to shut the station
>> down.  Today with all of the computerized gadgets, power down in
>> sequence is more and more of a must do.
>>
>> In another brand of radio to which I am familiar, there is a CPU
>> timing circuit that assures the CPU is up and running before loading
>> the operating code.   If this circuit is running too fast, it may
>> cause a partial load and related error.  This circuit is basically a
>> simple RC network, and with age the C value decreases thus making the
>> timing circuit run too fast.   i.e.  not enough delay.
>>
>> 73
>>
>> Bob, K4TAX
>>
>>
>>
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