EA3GCY EGV-9B v1, Assembly Manual

Page: 18 / 35

EGV-9B
80 to 10m QRP CW Transceiver Kit Page 18
Mount the sockets for IC2, IC3, IC5, IC6, IC7, IC8, IC9 in the locations printed on the circuit board. Make
sure that the sockets lie flat against the circuit board. Next, insert IC2, IC3, IC5, IC6, IC7, IC8, IC9 into
their respective sockets.
Install IC1, IC4, IC10 and IC11. These are regulator integrated circuits.
IMPORTANT: Make sure that the IC's are fully inserted into their sockets. A poor contact between the
socket and IC can cause malfunction of the kit.
 R
elays
Install RL1 and RL2 relays. They can only be placed in one position.
Make sure that the body of the relay lies flat against the circuit board.
L1
T
oroid Transformer
L1 is an impedance matching transformer. An FT37-43 (black toroid 9.5mm/0.375in outer diameter) is
used. It has a 10-turn primary and a 3-turn secondary.
- Take 16-1
7cm (7.5”) of 0.5mm diameter enameled wire and wind ten (10) turns on a black FT37-43
toroidal core. Spread the turns evenly around the entire toroid and wind them tightly so that they follow
the contour of the toroid and are as tight against the toroid as possible. The turns should be evenly
distributed around the circumference of the toroid. Leave pigtails of 10-
20mm (0.70”).
- Now take about 8
cm (3.5”) of 0.5mm diameter enameled wire and wind three (3) turns on the other
side of the toroid, spacing the turns over the previous winding. Leave pigtails of 10-
20mm (0.70”).
- Before inserting them on the circuit board, use a knife or sandpaper to scrape off the enamel from the
pigtails of the windings. Solder them in place.
- The 3-turn winding (c-d) faces towards the output transistor Q8 and the 10-turn winding (a-b) towards
C31 and C34a.
Counting the turns: Count one turn for every pass of the wire through the center of the toroid.