Heathkit HR 10B Manual

Page 1

Assembly

and

Operation

of the

-Hmmm-
BASIC AMATEUR
BAND RECEIVER

MODEL HR-IOB

HEATH COMPANY
BENTON HARBOR.
M|CH|6AN 49022

TABL E OF CONTENTS

Specifications
Introduction.
Circuit Descript

Construction Notes. .
Parts LiSt. ....... . . . . . . . .
Proper Soldering Techniques. . .
Step-By-Step Procedure. .

Step-By-Step Assembly. . . . . . . . 11
Parts Mounting. . . . . . . - 11
Transformer Wiring. . . . . . 16
Harness Wiring. . . . . . . . . . 17
Initial Wiring. . . . . . . . 18
Component Installation. . . . 20
Front End Mounting. . . . . . . 25

Chassis Top Parts Mounting And
Wiring.... ................ 2'7

Initial Test. . . 29
Alignment. . . . . . . . . 30
Front End Alignment chart. . . . . 32
Final Assembly. . . . . . . 33
Installation And Opera on . . 33

Antenna....................... 34

InCaseOfDiifiCulty................ 34
Specific Problems. .

nun... 35

Replwemcnt Part: Price Lin ............. 37
Replacement Parts For The Preassembled

Front End .....................
Schematic. .(fold-out from page) .

Warranty ............. Inside front cover
Customer Service rrrrrrrrrr Inside rear cover

The Heath Company reserves the right to
discontinue instruments and to change specifi-
cations at any time without incurring any
obligation to incorporate new features in instru-
ments previously sold.

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with exceptionally good selectivity.

Amplified IF signal from the plate of V3 is
coupled through second [F transformer T2 to
the grid of IF amplifier tube V4A. Tube V4A
again amplifies the IF signal. At this point in
the circuit the Beat Frequency Oscillator (BFO)
signal from V4B may be beat with the IF signal
by turning the EEO switch to BFO. The intro-
duction of the BFO signal produces an audible
signal for Continuous Wave (CW) or Single
Sideband (SSB) reception, The output from V4A
is coupled through IF transformer T3 to tube v5.

D ETECTOR-AUD IO OUTPUT

Tube V5 is the detector stage, This tube de-
tects the audio signal from the 11 signal. This

audio signal is then coupled througi capacitor
C35 and the AF GAIN control to the grid of the
first audio stage VGA. The amount of audio
signal applied to the grid of VGA can be regu-
lated by the AF GAIN control. This in turn
regulates the amount of audio signal that will
be amplified by VISA. From tube VGA, the audio
signal is coupled by capacitor C38 to the grid
of tube VSB, Tube VEB further amplifies this
audio signal and feeds it through audio output
transformer T4 to the Speaker jack.

PON ER SUPPLY

The power supply uses tube in as afull-wave
rectifier with power transformer T6. Filtering
of the DC voltage is provided by resistors R44
and R43, and capacitors C55, C56, and C57.

CONSTRUCTION NOTES

This manual is supplied to assist you in every
way to complete your kit with the least possible
chance for error. The arrangement shown is
the result of extensive experimentation and
trial. 11 followed carefully, the result will be
highly stable and dependable performance. We
suggest that you retain the manual in your
files for future reference, both in the use of
the equipment and for its maintenance.

UNPACK THE [GT CAREFULLY AND CHECK
EACH PART AGAINST THE PARTS LIST. In so
doing, you will become acquainted with the
parts. Refer to the information on the inside
covers of the manual to help you identify
the components. ll some shortage or parts
damage is found in checking the Parts List,
please read the Replacements section and sup-
ply the information called for therein.

Most kit builders find it helpful to separate the
various parts into convenient categories. Muffin
tins or molded egg cartons make convenient
trays for small parts. Resistors and capac-
itors may be placed with their lead ends in-
serted in the edge of a piece of corrugated
cardboard until they are needed. Values can
be written on the cardboard next to each
component. The illustration shows one method
that may be used.

Resistors generally have a tolerance rating of
10% unless otherwise stated in the Parts List.
Tolerances on capacitors are generally even
greaterr Limits of +10% and -20% are common
for electrolytic capacitors.

We suggest that you do thefollowingbefore work
is started:

1. Lay out all parts so that they are readily
available.

2. Provide yourself with good quality tools.
Basic tool requirements consistofascrew-
driver with a 1/4" blade; a small screw-
driver with a 1/ 8" blade; long-nose pliers;
wire cutters, preferably separate diagonal
cutters; a penknife or a tool for stripping
insulation from wires; a soldering iron (or
gun) and rosin core solder. A set of nut
drivers and a nut fiarter, while not neces-
sary, will aid extensively in construction
of the kit.

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( ) Set all front panel controls as follows: ( ) Connectthe RFsignalgeneratortotheANT-
enna connector.

AF GAD! Maximum clockwise
RF GAIN Maximum clockwise
BFO TUNE 12 o'clock ( ) Connect the AC voltmeter acrossthe Speaker
MAIN TUNING As indicatedin Alignment jack.

chart.
BAND Switch As mdicatedinAlignment

chart. ( ) Complete each step as indicated in the
EEO OFF following chart. Refer to Figure 3 for the
ANL OFF location of each coil. Be sure to keep the
AVG OFF signal generator level as low as possible
STBY-REC REC while still obtaining a usable reading of the
CAL RESET 12 o'clock meter, this should he just above the normal
ANT TED/I 12 o'clock noise level.

FRONT END ALIGNMENT CHART
BAND SWITCH RECEIVER AND ADJUST FOR SECTION BEING ADJUSTED
POSITION GEN. FREQ, MAX

80 meters 3.50 mc L11 * Oscillator

3,75 mc** L1 and L6 Antenna and mixer coils
40 meters 7.00 mc L12* Oscillator

7.15 mcW LZ and L7 Antenna and mixer coils
20 meters 14.00 inc L13 * Oscillator

14.15 mc L3 and L8 Antenna and mixer coils
15 meters 21.00 mc L14 * Oscillator

21.25 mcM L4 and L9 Antenna and mixer coils
10 meters 28.00 mc L15* Oscillator

29.00 mc** L5 and L10 Antenna and mixer coils

*There will be no signal heard until these Set the Receiver and generator frequency as
coils are peaked near the correct setting. Once lndicatedinthe chart and adjust the CAL RESET
the correct setting is found, carefully adjust until the signal is heard.

for a maximum reading,