Kanga Products Bassinet, Manual And User Manual

Page: 11 / 26

Rooster CW Transceiver Rev3 Page 11 of 26 22
nd
Nov 2023
Next we need to fit the trimmer capacitor. Its colour may not be as shown in the photos
here (if you not reading black and white paper instructions!)
Important! The trimmer has one flat
edge, that should be positioned next
to the crystal as
shown here, don’t
worry, you haven’t missed fitting the
crystal we will do that next.
The Crystals.
The kit uses three crystals, two in the front-end filter and
one for the mixer, The crystals are all the same frequency
but some of the characteristics are different between the
two types you have with the kit. For the mixer we need to
use the shorter crystal.
This is to be fitted between the chip socket and the trimmer
as shown above.
The Mixer IC
The mixer chip used on the Rooster is getting very rare in its
DIP format,
it’s still available in its SMD size.
I have supplied this chip pre-fitted to a small adapter board BUT
you will need to solder the pins to this board, unless you are
VERY lucky and I have already done that for you. (If the pins are
already fitted move on to the next stage the RF noise test.)
Put the two 4 pin strips into the
adapter board. The short pin side
into the adapter board as the
photo here.
CAREFULLY plug the board into the socket on the board.