Heathkit HL 2200 Manual 2

Page 1

HEATHKITE
MA "A'-

HEATH COMPANY - BENTON HARBOR, MICHIGAN

Page 50

Page 48

ESIDE

1/2
SIDE

A

SHIELD

PAPER
0 INSULATOR

Detail 4-6A

Refer to Pictorial 4-6 (Illustration Booklet, Page 7) for
the following steps.

Refer to Detail 4-6A and cut a 1/2 x 1-3/4"
notch out one corner of the 4-1/2 x 6" paper
insulator as shown. Make sure the 1-3/4" side of
the notch is along the 6 side of the paper in-
sulator.

( )

Remove the paper backing from the paper in-
sulator; then position the paper insulator with

Heathkit®

LOW-VOLTAGE
TRANSFORMER
(#54-238)

#8 LOCKWASHER®

8-32 NUIGB

Detail 4-63

( ] T2: Refer to Detail 463 and mount the low-
voltage transformer (#54-238) on the top of the
chassis. As you position the transformer. push
the two large green leads and the green-yellow
lead down through grommet AH. Push the
other leads through grommet AK. Use 8-32 x
3/8 black hardware at A], BL, BN, and BP.
Position the transformer toward the rear of the
chassis as far as possible before you tighten
the hardware.

the 6 side vertical and with the adhesive side [ ) Temporarily remove the control nut and the
against the RF shield. Make sure the insulator control flat washer from rotary switch CZ [De-
clears the zener diode and the sheet metal screw tail 4-6A).
at CC. Rub the paper firmly into place.
0 1/. 1/, 3/4 1 (INCHES) 2 3 4 5 6 7
l l1°1 3f°l 6{1 71' l . 1 l l 1 1 . l 1 1 . l, . 1 1 l . 1 r l L 1 l 41 l 1 1 L l 1 1 L,l 1 l 1 1 | t t l
V""l I I ' I I ' I ' I ' I T r ' 1 r I I ' I T F I I ' I I I
O 5 1 (CM) 2 3 a a a 7 e 9 10 n 12 13 u 15 re 11

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Heathkit"

MOTOR TABS FAN BLADE
ASSEMBLY
v

.1

RING

RETAINING SP

FAN BLADE
HUB
FAR MOTOR

Detail 4-6H

( ) Refer to [Detail 4-6Hl and 13115}! the CODDBCtOI ( ) Refer to Detail 4-6K and install the fan blade

on one of the prepared black wires onto one assembly (#266-296) on the fan motor shaft.

Of the motor tabs, and PUSh the other connec- Position the fan motor and the blade assembly

tor onto the remaining motor tab, as shown. as shown, and apply firm downward pressure

with both thumbs on the fan blade hub. A

( ) Position the rear panel as shown in Detail 4-6]. slight rocking motion will help. Push the fan

Then locate hole FK. This hole is 3-7/8" down blades onto the motor shaft until there is 1/16"

from the top edge of the panel and 8-3/4" in to 1/32" clearance between the outer end of

from the right edge of the panel. the fan blade hub and the tip of the motor
shaft.

( ) Refer again to Detail 4-6] and mount the fan
motor on the rear panel at holes F] and FK. Use t ) Refer to Detail 4-6L and mount the rear panel

two 7/16" spacers, two #6 lockwashers, and t0 the chassis rear apron at FC and FD, and
two 6-32 nutsasshown. NOTE: When you have to the left side panel at FB. Use 6-32 x 3/ "
the motor mounted correctly. the sides of the black hardware.

motor frame will be parallel to the edges of the

panel. ( ) Rotate the fan blades to make sure they do not

hit anything. Reposition the motor mounting
as necessary.

NOTE: The free ends of the motor wires will be con-

nected later. 6_ 3 2 NUT

#6 LOCKWASHER

~\ 6-32 x 3/8"
BLACK SCREW

Detail 4-6L

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Page 84

Heathkit"

TUNE-UP

The current and voltage figures given in this section
are approximations. Actual readings will vary at each
installation with such factors as line voltage, exciter
drive, and load impedance.

The following procedure for tuning the Amplifiel
should take only a few seconds after you go through it
a few times. Note the LOAD control position so it can
be preset the next time a particular band is used.

CW AND RTTY PROCEDURE

Make sure the Amplifier has been installed as de-
scribed and illustrated in the Installation section.
IMPORTANT: Before you proceed make sure you
have a dummy load ( such as the Heathkit cantenna) or
an appropriate antenna connected to the Amplifier
output.

[ ) Set the Amplifier controls as follows:

SWITCH OR

CONTROL COMMENTS
Desired band
segment

HBO and 40

After tune-up. note position

so control can be preset in
the future.

m-
-__

bands] 4 [20,
and 15, bands)

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Heathkit

FILAMENT AND BIAS SUPPLY

Transformer T2 has two secondary windings. One
winding furnishes 5 VAC at 30 amperes for the
amplifier tube filaments. The #2114D pilot lamp,
PL1, which is used for power indication is also con-
nected across the filament line.

Filament supply is fed to the two tubes through RF CS,
a coil which is bifilar wound on a ferrite core. This
coil forms a choke to raise the tube filaments above RF
ground so the driving voltage will not be short-
circuited.

The second winding on transformer T2 is used in a
half-wave rectifier circuit for the bias supply voltage,
to operate relay K1 and to furnish ALC threshold
voltage. The AC voltage from this winding is rectified

Page 93

by diode 016 and filtered by capacitor C4.

This DC voltage is connected to lugs 3 and 11 of relay
K1. In the receive mode, this voltage is applied
through lug 9 to the center-tap of the filament wind-
ing. This positive voltage increases the voltage differ-
ence between the tube grids (which are grounded for
DC) and the tube filaments, which now carry the
positive DC voltage in addition to the AC filament
voltage. The tube grids are consequently biased
beyond cutoff and no plate current flows.

In the transmit mode, the center-tap of the filament
winding is connected to ground through lugs 9 and 6
of the relay, the 5.1 volt zener diode ZD1, and resistor
R3. The plate current through the zener develops 5.1
VDC operating bias for the tubes and limits the idling
plate current.

RELAY

Relay K1 has three sets of single-pole, double-throw
contacts. When the relay coil circuit is open the con-
tacts are in the receive mode. Amplifier switch
(SW5) can be used to turn K1 on and off.

Approximately 120 VDC is connected to one side of
the relay coil at lug 11. Lug 10 connects the other side
of the relay coil to the Antenna Relay jack on the rear
panel. This jack is usually connected to normally
open relay contacts in the exciter (such as a VOX or
PTT relay]. When these relay contacts close. they
must connect the amplifier relay coil circuit to
ground. The amplifier relay will then close and its
contacts will be in the transmit mode.

The function of amplifier relay contacts 3, 6, and
9 was discussed in the Bias Supply section.

Relay contact 7 is connected to the RF INPUT con-
nector. In the receive mode the incoming signal is
transferred directly to the RF input through relay
contacts 8, 2, 1, and 7. In the transmit mode, the
RF Input voltage is connected through relay contacts
7 and 4 to lug 1 of Band-switch wafer A.

In the transmit mode. the RF output is connected
through relay contacts 5 and 8 to the pi network
output circuit of the Amplifier.