QST corrections, January 2003, page 31
"A 222 MHz Transverter for the Yaesu FT-817"

U4A and U4B have the pins swapped (the two sections are interchangeable)
the red LED, D12, is connected to +8 volts in the photo, near RY1
there are two C47 on the schematic - the one near J3 becomes C51 (0.01uf)
there are two C48 on the schematic - the one near J3 becomes C50 (0.01uf)
C49 is missing from the parts list - 0.01uf
C79 is missing from schematic (0.1 uf) - in parallel with C17 
C78 is missing in bottom side assembly photo
R21 on the (bottom side) parts locater drawing is located one pad too low. 
    the photo is correct.

QST text on page 35, under heading "The Receive Circuit," has a sentence
beginning "A tuned circuit, L5 and C6..." should read L6 and C5

Q2 - the 2N6660 may be hard to find.  the IRF510 (Digikey IRF510-ND) is
     a good, inexpensive substitute.  almost any N-channel power FET will work.
     
J3 clarification - the connections are to the 8-pin ACC jack on the FT-817.
     BAND DATA and GND go to the same pins, while PTT connects to the TX GND pin.
     
thanks to K2QO, KA7EXM, W4YN, and N9MNP for pointing these out.

latest correction and updates at http://www.w1ghz.org

73, 
paul W1GHZ

>>additional correction 1/14/03 (tnx N5ZTW):
there are two C68 on the bottom side parts locater drawing.  the one near U2
     should be C67
     
>>additional notes 1/20/03:
the metal can of the mixer, M1, should be connected to the ground plane surface
of the PC board.  a solder tack at one point should be adequate.

the mounting lugs of the filters, FL1 and FL2, should be soldered to ground
on the PC board.

>>additional notes 2/2/03:
I've had a few requests for expected readings using the detector circuit
in Figure A in QST.  in case my very old one is different than recent components,
I built a new copy using 1N4148 diodes from a Jim-Pak from the local electronics
store.  the calibration curve is available for download.

they only test point accessible in an assembled unit is the input to A7, the
final amplifier.  in one of my transverters, running 5.5 watts out, I measured
0.92 volts with the Figure A detector, which is about +6.5 dBm.

the other important test point is the LO drive to the mixer, which should be 
about +12 dBm.  from the calibration curve, this should measure > 2.5 volts.