[Elecraft] K2 BFO Test fails

[Don Wilhelm]

  Benny,

Thanks for providing your name, and very good luck on acquiring your 
amateur license.
I am also adding K2 to the subject - some here like to filter by rig type.

OK, first the frequency is wrong, are you certain you have the time 
scale on your 'scope calibrated?  The K2 BFO crystals should be marked 
for 4915 kHz (or something near that) - check those markings first.

Then check continuity through L33 with your ohmmeter - it is best 
checked from the top of the board which will check for improperly 
soldered connections too.  If the resistance is quite high, you may have 
an open L33 or an improper solder connection.

Also check D37 to be certain it is not installed backwards - that could 
kill the BFO signal.

Check for a solder bridge at pins 3, 4, 5 and 6 of RP6 - that also will 
kill the signal.

73,
Don W3FPR


On 12/3/2010 4:50 PM, kruegerbenny wrote:
> Q24: 5,76V
>
> L33(left): 8,33MHz(240mV peak-to-peak)
> L33(right): no signal (i think here is the lost)
>
>
> I have to admit that I don't have a call sign yet, but I'm already learning
> for the "exam" (I'm a student a had a lot to do the the last months..)
>
> Thanks for your help
>
> Benny