[Elecraft] K3 output buffer modification

[Alan Bloom]

Unfortunately you won't be able to measure an RF signal at the IF output
connector with a meter or oscilloscope unless you have a REALLY strong
signal at the K3 antenna input.

As a general sanity check, you could do a DC voltage measurement on the
JFET just to make sure it is still drawing current.  I don't know the
exact voltage, but I imagine you should get a volt or two on the JFET
source (R9 source resistor).  That does require taking the bottom panel
off the K3 again.

Alan N1AL


On Wed, 2010-01-06 at 15:33 -0500, James Sarte wrote:
> Hi Alan,
> 
> Unfortunately, I do not have a second receiver.  Is there a way I can
> test output voltages with my meter - anything at all to just confirm
> that the resistor is indeed working?
> 
> Anyway, the rig passed the smoke test upon turning on so that's a good
> start right there.
> 
> James K2QI
> 
> On Wed, Jan 6, 2010 at 3:26 PM, Alan Bloom <alan at elecraft.com> wrote:
>         If you have a second receiver, you could connect it to the K3
>         IF output.
>         Tune the second receiver to 8.215 MHz and you should hear
>         whatever the
>         K3 is hearing at a similar signal level.  (About an S-unit
>         lower with
>         the K3 preamp off, one S-unit higher with preamp on.)
>         
>         Alan N1AL
>         
>         
>         
> 
> -- 
> 73 de James K2QI