[Elecraft] K2: "Pop" when switching certain bands

[Don Wilhelm]

Jim,

Do you have 8R Hold turned on?  If not, set it on.

Remove that external DSP speaker and see if you still have objectional pops.

Do you have the KDSP2 installed?  On older K2s with the older KPA100 
installed, you can experience some harmless "pops", especially if you 
have the DSP NR turned on.

The number of relays which are switched during a band change varies 
depending on which bands you are coming from and going to - so relay 
clicking is normal.

You might want to check RF Board Q23 to be sure it is working.  The 
voltages during receive and transmit should be as shown in the DC 
voltage tables.

73,
Don W3FPR


On 6/30/2019 4:55 PM, Jim KO5V wrote:
> Good Afternoon,
> 
> Today I noticed a "pop" on the audio of my K2 when I changed in and out 15M, so I checked the switching on all bands:
> 
> When changing from 15M to 12M or 17M it is fairly loud. Changing from 12M or 17M to 15M causes a fainter "pop". A much more attenuated "pop" happens when changing from 14M to 10M, and also from 10M back to 14m.
> 
> Also, on 15M, when changing from VFO B to VFO A I hear a loud "pop", but it does not happen going from A to B.
> 
> The fainter "pops" might have always been there, but the ones on 15M are loud enough to cause the clip light on my DSP to turn red.
> 
> I wonder if it has something to do with diodes across relays, or the relays themselves.
> 
> Any more ideas?  Thanks in advance.
> 
> 73, Jim KO5V
> 
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