=  NOW 13 WPM  =  TEXT IS FROM OCTOBER 2022 QST PAGE 36  =

JUST INSIDE THE REAR PANEL SEE FIGURE 6 ARE THE TUNING RELAYS, CAPACITORS,
AND INDUCTORS.  THE AIR CORE INDUCTORS ARE PLACED AT RIGHT ANGLES TO EACH
OTHER TO REDUCE INTERACTION.  A SQUARE BRASS TUBE IS USED TO PROVIDE A
GROUND BUS FOR THE CAPACITOR SWITCHING RELAYS.  IT ALSO HELPS TO HOLD THE
RELAYS IN POSITION.  IN FIGURE 4, THE PLASTIC CONDUIT THAT HOLDS THE RELAYS
CAN BE SEEN.  THE GROUND BUS FOR THE TUNING CAPACITORS IS CONNECTED TO THE
PRINTED CIRCUIT BOARD WITH TWO HEAVY WIRES.  THE TUNING CAPACITORS ARE
<  QST DE W1AW  =
SOLDERED DIRECTLY TO THE RELAY TERMINALS.  A FEW GREEN BYPASS CAPACITORS
AND FERRITE BEADS ARE SCATTERED ABOUT IN MY TUNER, BUT THESE MAY NOT BE
NEEDED, DEPENDING ON YOUR LAYOUT AND POWER LEVEL.  ADD THEM AS REQUIRED.
THIS TUNER IS USED AT 500 W WITH NO PROBLEMS.  ON THE FAR RIGHT SIDE ARE
TWO VN10KM FETS SOLDERED TO THE BOARD.  THOSE ARE SPARE PARTS.  IN THE
CENTER OF THE SIDE, A STRAP CONNECTS THE COVER TO GROUND ON BOTH THE LEFT
=  END OF 13 WPM TEXT  =  QST DE W1AW  <