[Elecraft] KPA-100 pop from TX to RX

[Don Wilhelm]

Dave,

What is the T-R delay set to?  If it is set to zero you may hear a 'pop' 
when going to receive.  Why it is not heard if 8R is set to normal is a 
mystery to me.
If you have the KDSP2 installed and your KPA100 is not up to date (blue 
toroid cores at RFC1 and L16) that pop would appear on *some* K2s.  The 
cure for that is to update with the KPA100UPKT.  If your shield is not 
up to date add the KPA100SHLDKT.  The new shield has clips to contact 
the sides of the K2, a narrow notch at the SO-239 jack, solder lugs to 
connect the outside of the shield to the SO-239 and a speaker shield.

I have no answer for the buzzing.  Is it in sync with the speech 
patterns?  If so, then your assumption about something loose is probably 
correct, but I would expect something other than a toroid - perhaps the 
KPA100 shield.

73,
W3FPR

On 7/3/2013 7:06 AM, DaveVK wrote:
> Hello everyone,
>
> I have just reconnected my KPA100 and I have a pop from the speaker when the
> transmit switches to receive.  I  checked most settings including that my 8r
> hold is set as per the manual.  I do notice that when I set 8r normal the
> pop disappears.  What's the go here?
>
> The other issue I've noticed (not happened before) is I detects a mechanical
> buzzing sound coming from the kpa100 when in SSB mode.  I think this may be
> just a torroid rattling but if anyone has some suggestions I'm open to
> hearing them.
>
> Regards,
>
> Dave
> K2 - SN3222
>