QRPGuys K8TND, Руководство пользователя

Страница: 5 / 8

Page 5 of 8 dc_102019.pdf
[ ]
The L1 position is set up for either a T50 or T68 size core. Push 1” of the wire down the hole
from the top and hold it, feed the remaining turns up from the bottom. Wind CCW,
Every time
the wire goes thru the center counts as one turn . Wind according to the table. If you have your
own special technique for winding toroids, use it. The wires must be over the core or under the
core for the group of turns as shown below. If the wound core does not look like the picture
below, it will not align with the pcb holes.
Be sure to verify the turn count before you trim the
wire.
Yellow Core shown for clarity
[ ]
If you are going to use a Digital Dial add the 3 turn pick-off loop as described below.
Trim and straighten the wires. If you have wound it properly, when the leads are bent down,
they will align with the pcb pads. The magnet wire has Thermaleze enamel, and can be
removed with a hot soldering iron. Remove the insulation, and tin the leads before installing on
the pcb. Now install at L1, in the “B” holes, flat with the pcb, and solder the two leads.
Optional digital dial:
If you want to add our Digital Dial. wind 3 turns of the magnet wire over the top of the L1 winding as
shown below, bend the wires down, tin them, and connect to the “DD” pads provided. Connect power
and signal from the board pads to the digital display inputs.
Do not program any frequency offset into
the Digital Dial.
Yellow core shown for clarity