20 meter High Performance Direct Conversion Receiver (3). Oscillator troubleshooting.

Link to schematic

Did some more diagnostic work on the this unit.  

Notes: 

1. The QST article says that the cathode of D2 should be at 9.1V.  Actual voltage is 8.9 V.  Good.
2. The QST article says that the C21 should be 2 V rms.  Actual is 0.87 V rms.  So the oscillator voltage is down significantly from what it should be.  I checked all the resistor values in the oscillator circuit and they are as expected. 
3. Removed C22 to see if the mixer was loading the oscillator somehow.  No evidence of that.  C22 was nominal 10 pF, and measured 9.6 pF.

There are other components to check in the oscillator circuit, but I suspect the transconductance, gm, of the Q4 is down and may be the source of the problem.  

I will order some MPF102 JFETs to see if replacing the transistor helps.  Perhaps the transistor was toasted while soldering. 

I will pull capacitor C19, C20, and C23 to check, and will pull L6 to check as well.

I am planning to do some simulations to check the dependence of the oscillator output on JFET gm.