Heathkit HM 9 Manual

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HEATHKIT®
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HEATH COMPANY - BENTON HARBOR, MICHIGAN

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50-54 and 144-148 MHz Models I )

NOTE: Perform the following steps only if you are
assembling your Wattmeter to cover the 50-54 or
144-148 MHz ranges.

( ] Cuta1-3/4"largebarewire.
[ ) Refer to Detail 2-3F and position the circuit

board into the chassis so it is between the
spacers at AA. AB, and AC as shown.

Position one end of the 1-3/4 large bare wire
into the hole in the lug of coaxial jack 12. Also
position the free end of the lead of capacitor
C3, coming from hole A of the circuit board,
into the hole in the lug of coaxial jack 12. Then
solder the connection.

Bend the large bare wire coming from coaxial
jack ]2 straight up so it is toward hole I1 in
the chassis.

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66 LOCKWASHER

1-3/4"

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m LARGE
BARE WIRE

Detail 2-3F

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PICTORIAL 2-4

Refer to Pictorial 2-4 for the following steps.

( ] Turn the shafts of control R9 and switch 52
fully counterclockwise.

/

[-1 Refer to Detail 2-4A and start a 6-32 x 1/8"
setscrew into one of the knobs. Push the knob
onto the shaft of control R9. Then turn the
knob so the pointer is at the 7 o'clock position

and tighten the setscrew.

( Similarly, start a 6-32 x 3/16 setscrew into
the remaining knob. Push the knob onto the
shaft of switch 52. Then line up the knob
pointer with the SWR label on the front
panel and tighten the setscrew (against the flat
on the shaft).

KNOB

Detail 2-4A

NOTE: Carefully inspect the chassis for the follow-
ing undesirable conditions:

1. Unsoldered connections.

2. Poor solder connections.

3. Bits of wire or solder that may be lodged in
the wiring.

4. Leads that could short to the chassis. to other
wires, or to lugs to which they are not con-
nected. Pay particular attention to the leads
of the capacitors that are connected to the co-
axial jacks.

NOTE: You will have several parts left over, depend-
ing upon the frequency range of the Wattmeter you
are assembling.

Proceed to Calibration."