Small Wonder Labs
PSK-20 Transceiver Kit 03/09/10
2000
23
Alignment Instructions
If you have not already done so, install all
DIP ICs in their respective sockets
. It may be
helpful to bend each row of IC leads inward
by pressing it gently on a table surface- this
will ease installation
. Doublecheck the IC
locations and orientation before proceeding.
Wire the DC power plug with the 2' (60cm)
length of 2-conductor wire supplied.
The lead
with the identifying stripe should be
connected to the center conductor of the
plug.
(
The PSK-20 is protected against
reverse polarity mishaps
.)
Receiver Alignment
:
Connect a 3.5mm (1/8") 3-conductor shielded
cable between your computer soundcard
Microphone input and the PSK-20's AF OUT
jack (J1).
If you have not already done so, download the
DigiPan application software. Here is a direct
link to the software:
http://members.home.com/hteller
/digipan/
Here is a link to a site with additional PSK31
information which you may find useful:
http://psk31.com
,
The "Software" link on this page will take you
to the DigiPan software download site.
Open the DigiPan application and using the
soundcard dialog boxes (speaker icon on
Windows task bar), advance the soundcard
receive gains to maximum (see Frequently
Asked Questions', Appendix II, for details).
Install the power plug at J5 and connect DC
power (12-15V).
The area on your computer screen below
DigiPan's frequency scale has been black. It
should now contain blue 'sparkles' once power
is applied.
Connect your computer soundcard LINE
OUT or SPKR OUT to the PSK-20's J3
connector with a 3.5mm (1/8") 3-conductor
cable. Connect your computer speaker cable
to the PSK-20's J2 connector.
J2 and J3 are
in parallel and permit use of the soundcard
for other applications without repeated
plugging and unplugging of cables.
Using a small slot screwdriver, adjust
transformer T1 for maximum audio to the
speakers.
Note: If you have an antenna
connected already, AGC action may make it
difficult to get a clean peak- remove the
antenna for this step.
Adjust trimmer capacitor C44 (above Y5)
with a small slot screwdriver to center the
noise picture in DigiPan's panoramic display
window
. If it's not centered, one edge of the
display will be noticeably darker than the
other.
On the DigiPan menu bar (at top), click on
'VIEW', 'FREQ DISPLAY' and 'LSB'.
On the DigiPan menu bar, click on
'CONFIGURE',
and
select
'START
FREQUENCY'. In the dialog box, enter
'14073000' for 'Start Frequency, Hz'. Click
'OK'.
The leftmost frequency legend reads 14069
and the rightmost reads 14072.
The right
edge of the screen (in full-screen mode)
corresponds to 14073 KHz.
Connect a 50-ohm nominal antenna to J6.
You should now see additional noise content
and very likely, amateur signals will now be
present on the display. Using the plastic
tuning tool, adjust inductor L3 for maximum
audio to the speakers.
Frequency Alignment:
Using the computer mouse, click the DigiPan
display point immediately below the '14072'
frequency tick mark. The 'diamond' symbol
will jump to that location.
Using a 'big rig', transmit a
CW
signal on
14072.0 (into a dummy load, please). A bright
signal line should appear somewhere within
the frequency display. Using a small slot
screwdriver, adjust C48 (left of Y6) until the
bright line's position is lined up with the
'14072' tick mark.
