Heathkit SB-401 - ALIGNMENT; ALIGNMENT WITH SB-303 RECEIVER AS A TRANSCEIVER

ALIGNMENT
Two methods of alignment for your SB401 Transmitter are
given. When the Model SBA-401-1 Crystal Accessory Kit is
installed, the SB-40] Transmitter is aligned as an independent
transmitter. If the Crystal Accessory Kit is not installed, the
SB-401 must be connected for transceive operation to an
operating SB-303 (or SB-300, or SB-301) Receiver prior to
starting alignment. If an SB-303 Receiver is used, incorporate
the SB-401 Modifications listed in the SB-303 Receiver
Manual under “‘Installation.”” Perform the appropriate group
of steps following.
ALIGNMENT WITH SB-303 RECEIVER AS A TRANSCEIVER
If the Accessory kit is not going to be used, the Transmitter
should be connected to an SB-303 or SB-301 Receiver. Refer
to Figures 2-]A and 2-1B on the fold-out from this page.
The following test equipment is required for alignment of the
Transmitter.
I. A 50 Q nonreactive dummy load (such as Heathkit
Model HN-31 Cantenna).
2. An 11 megohm input VTVM (such as Heathkit Model
IM-11).
3. An RF probe for the VTVM (such as Heathkit Model
309-C).
A. A CW key plugged into the Key jack. CAUTION: Do
not depress the key until specifically instructed to do
so.
NOTE: In the following steps, the switches and controls to
be set are on the Transmitter unless otherwise stated.
Page 90
Refer to Figure 2-2 (fold-out from Page 93) for test points
and adjustment locations.
( ) Remove tube V9 from the transmitter.
( ) Connect the SB-401 Transmitter to the SB-303 Receiver
as shown in Figure 2-1A.
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8.6 MEGAHERTZ TRAP
(_) Preset the notch of the variable capacitor on terminal
board #1 as it is shown in inset #1 of Figure 2-2.
21 MEGAHERTZ TRAP
The 21 MHz trap (RFC1) was preset at the factory. Do_not
change the setting of this trap.
CARRIER GENERATOR
( ) Plug the line cord into a 120 volt AC outlet.
( ) Set the Transmitter controls as follows:
FUNCTION switch TRCV
Receiver FUNCTION switch STBY
FREQ. CONTROL LOCKED
LEVEL control
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MODE switch CW |
Fully clockwise |
HEATHEIT®