ILER-40 MK2 SSB QRP Transceiver Kit
Page 24
L6 VXO tuning inductor
A T68-2 is used (red toroid with 18mm/0.690in OD).
Cut about 113cm (44in) of 0.3mm enameled wire.
The number of turns for L6 will depend on the crystal option that you have chosen for the VXO:
- If you use the 12.031MHz crystal pair, then wind fifty-four (54) turns.
- If you use one 12.096MHz crystal, wind fifty-five (55) turns.
Leave an extra 1.5-2cm pigtail of wire on each end.
L6 can be wound in two stages. Pass half of the wire through the toroid, wind half of the toroid, and then
turn the toroid and wind the other half. If you're not sure how many turns you have wound, you can count
them easily looking closely through a magnifying glass. The half-turns that only pass through the inside
of the toroid also count as a complete turn.
IMPORTANT
: DO NOT MOUNT toroid L6 yet. It will be installed later, in the last section for adjustments
(see the section “adjustment and testing”).
Volume Potentiometer P4 and Tx-Rx LED D9
Install the volume potentiometer P4 and the bi-color LED D9 as shown in the picture.
You may prefer to mount these components on the front panel, off the circuit board. There is no problem
in doing this as long as the wires you connect them with are kept short.
Some series of bi-color LED's are fabricated with the leads reversed; in this case you will need to orient
the LED opposite to what the circuit board's component outline shows.
It should illuminate in green in Rx and in red in Tx; if it is the contrary, just turn the LED around (the
middle lead is always the common).
