[Elecraft] Re: Alignment and Test, Part II

[W3FPR - Don Wilhelm]

Peter,

For your BFO problem.

Look at Q9 and Q10 (MPS5179) on the control board.  If they are colored 
blue, they may be weak - Elecraft will replace them with the black ones.  In 
the meantime, 2N2222s may be substituted.  The signal level at TP2 is much 
lower than at TP3.  Your probe must work since you were able to measure the 
PLL/VCO frequencies at TP1 and TP3.

If I recall, you have a 'scope (if not, use an RF Probe) - you should see 
0.025 to 0.070 volts RMS at TP2 (K2 menu must be in CAL FCTR or no rf 
voltage will be seen).  On your 'scope this will be 70 mv to 197 mv peak to 
peak.

If you have OK RF voltage on TP2, all should be good, but if not, check the 
level at U11 pin 6, that should be 0.20 to 0.70 Vrms (0.56 to 1.98 Vp-p).

Since your external counter shows the correct BFO frequency, I suspect Q9 
and Q10 on the control board.

73,
Don W3FPR


----- Original Message ----- 
>
> The internal frequency counter work, i have calibrated on TP3 with an 
> externel counter.
> But on TP2 (BFO) i read only nonsens on the Display. My external counter 
> reads the correct frequency at TP3.
> Maybe the level at TP3 is low or i have a problem with the RF-Probe.
>