Basic Receiver Operation Test - Ten-Tec 1253 Assembly And Instruction Manual

PHASE 4

Basic Receiver Operation Test

The purpose of this assembly phase is to let you verify that the
receiver indeed WORKS as the cumulative result of your good
work done in Phases 1, 2 and 3. We can do this by wiring in the
parts needed to tune around one popular and active band,
connecting antenna, speaker and DC voltage and then just play
with it for a while. For this test, we'll chose Band 4 (6.8 to 8.5
MHz.), a tuning range which includes the 40 meter amateur band
as well as numerous other transmissions. We will activate this
band by directly connecting the supply voltage intended for the
bandswitch control board. This test is not necessary if you prefer
to move ahead to complete receiver assembly: there will simply
be more details to troubleshoot if the receiver does not perform
as specified.
4-1. Install molded coil L4, 8.2 μH (gray-red-gold-gold).
4-2. Install C23, a .01 μF " MYLAR" capacitor marked 103.
4-3. Install D4, one of the 9 tiny 1SS135 PIN diodes in your
kit, making sure that its banded cathode end is oriented as
outlined on the board (i.e., pointing toward C29/Q5).
4-4. Prepare a 3" length of RED hookup wire and solder one
end to "X" near Q5.
4-5. Solder the other end of the red hookup wire (4-4) to the
rearmost pad for " C37 " (a capacitor position NOT used in the
standard version of this receiver.) This wire connection has the
effect of a temporary +8VDC connection to the "Band 4" point.
4-6. Reconnect the white and black "AUDIO OUT" wires to
the speaker per 1-32.
4-7. Connect an outdoor antenna or at least 10' of hookup
wire to the center conductor of the coax cable.
4-8. Turn ALL panel controls completely to the left.
4-9. Re-connect 11-15 volts DC to the red and black wires
used in the Phase 1 test.
4-10. Turn the volume control fully clockwise and then back
to its middle position. With all other controls turned to the left,
you should hear only a soft hiss during volume control rotation.
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