Instruction manual

FHT-1 • 24
CONGRATULATIONS
This completes our assembly of the FHT-1 Sly Fox transmitter, now's a
good time to give your masterpiece a good going over, being especially alert
for any:
TESTING, ALIGNMENT AND ADJUSTMENT
To prepare your FHT-1 for testing, you'll need the following items:
 1. The hexagonal, non-metallic alignment tool included with your kit.
 2. A suitable 50 ohm dummy load.
 3. Proper cable to connect from FHT-1 transmitter (SO239) to dummy
load.
 4. A 12 volt DC power source of at least 1 amp.
 5. A digital multimeter.
With all the above set-up and handy, let's get testing!
 1. Using your hex head tuning tool, back out the coil slugs in L9, L13,
L5, L11 even with the top of their plastic coil form. If a slug binds, gently
rock it back and forth till it loosens up, be very careful not to crack the
slug as they are brittle. Slowly rotate each slug clockwise into the coil
form the indicated number of turns:
 2. Rotate modulation control R13 fully counter-clockwise.
 3. Notice that we have not yet installed the microcontroller, U2. In order
to first test the transmitter section, we’ll need to “fool” the transmitter into
thinking that the micro is telling it to transmit on high power. This is
accomplished by tying the P(ush) T(o) T(alk) line and
the high power
control line to the +5V DC supply. A clip-lead or jumper wire must be
attached from jumper JMP7 to jumper JMP4 and
one side of resistor
R14 as shown in the parts placement diagram. Without these
connections the unit will not operate.
 4. Apply 12 volts to the FHT-1 transmitter board. It’s a good idea to
fuse the power to the FHT-1, 1 to 2 amps will do.
 5. Connect a proper 50 ohm dummy load to antenna connector J1. In
a pinch, a light bulb may be used - see the section "Verifying
Transmitter RF Power Output".
 6. Hook your multimeter to TP1 and set the meter to the 200 mVDC,
(0.2 VDC range).