Ten-Tec T-KIT 1056 User manual

RESIS.TOR 0 REFRESHER
Multiply both digits of
first 2 bands by 3rd Band:
black 0 o x1
brown 1 1 x 10
red 2 2 X 100
orange 3 3 X 1000
yellow 4 4 x 10,000
green 5 5 x 100,000
blue 6 6 x1 ,ooo,ooo
violet. 1 1
gray 8 8
Wblte 9 9
DDkl - - X 0.1
"" Examples ...
reel-reel-gold = 2.2 n
rea-red-black = 22 o
red-reel-brown = 220 o
red-red-red = 2200 0 12.2KI ALL ABOUT THOSE
red-red-orange = 22K Disc cap Numbers!
4th Band= mfr's roterance. 101 = 100 pF
Gold= 5% sliver = 10% 102 = .001pF
Some Ham Band
·:c Highlights }c
"'WARC Bands
10.100 ·10.150
18.068.
18.168
24.890 • 24.990
"" National calling
Frequencies !Simplex!.
29.600 FM
50.110 SSB OX
50.200 USA SSB
103 = .01 pF
104 .;, .1 pF
"" want more?
221 = 220 pF
222 = .0022 pF
223 = .022 pF
331 = 330 pF
332 ·= .0033 pF
471 = 470 pF
472 = .0047 pF
473 = .047 pF
474 = 7
Got the Idea ?17
51.700 Packet ...-~~....,---~~~.,
52.525 FM MAKE your Antennas!
144.20 sse 1/4 wavelength Un FEEn
146.52 FM = 234 • +. FREQ In MHZ
222.10 CW-SSB •use 238 tor radials
2;13.50 FM • FOR VHF. vou cari use 2808
432.10 CW to (le~ 1:4 A In INCHES II!
446.00 FM
""E1SY QRP CW
7.040
10.106·
14.060
"" Easy Space to Earth
29.357 RS·10 series
satellite cw beacon
145.55 FM SAREX & MIR
space-earth downlinks
MOLri~o pH INDUCTORS
look very much like resistors.
bUt don't "resist· much -- Just
check them out on vour meter
to read less tnan 1-2 n. mu;:h
lower than resistors in your kit.
values are In :'H tmlcrone!lnesl,
to 1000 pH per resistor coae,
with 3rd silver band =x .01.
"" Examples:
red-red-silver 122X.011 = 0.22 ;.~H
red-reel-gold 1X 0.11 = 2.2,:~H
red-red-black IX 11 = 22 pH
red-red-brown IX 101 = 220 pH
brown-black-red = 1000 11H
FOR SURE!
we ALL know this •••
E volts =1amps X R 6hms
R = E/1 •
I= E/ R
P watts= E x I
They used to make
BULLETS .
bY dropping melted lead
way down Into cold water.
That's how some folks make
excellent cold solder joints -
... by melting solder with
the iron so It blobs onto
the board, looking like
deformed buckshot.
PLEASE •.•
heat the connection Itself
so IT does all the melting,
forming a shiny cone,
not a dirtY blobl
A super SOLDER BRIDGE
Is built with that extra solder
clinging to the Iron's tiP that
we didn't need anyway.
Just
jiggle the soldering Iron,
and
we can bUild nifty bridges
across 2, 3, 4 or more
PC-board soldering points,
especially DIP IC'S or sockets.
oon't try It: you'll hate it I
.. 11itKif' A Division of TEN-TEC, Inc.
1185 Dolly Parton Parkwav • Sevierville, TN 37862-3710
Information • 1-865-453·7172
Fax • 1-865-428-4483
Orders • 1-800-833-7373 {credit card orders only)
I
·1
l
No. 1056
T-KIT Module Board
74306
· CW-558. RECEIVER
"ANY BAND" NE61 2 Direct-Conversion
desig~ with all parts for choice of 1 60-1 0
meter ham bands, plus variable . ·
bandpass & fine-tuning controls
1reKIT
byTEN-TEC-
INSTRUCTI-ON
MANUAL
America's Best!

T KIT Manual No. 74306
Price: $3.00
Kit Assembly and Instruction Manual·
for T-J<IT Module Board Kit
Model No. 1 056
Direct-Conversion Receiver
with Parts for choice of 1 60 to 10 Meter Ham Bands
Table of Contents
Introduction ....................... 5
Design Features . . . . . . . . . . . . . . . . . . . . 6
Circuit
Description (Schematic on pp. 12-13) 7
Kit Parts List
....................... 8-9
Circuit Board X-Ray View ............. 10
Circuit Board
Assembly Steps . . . . . . . . . . 11-1 6
Circuit
Schematic , .· . . . . . . . . . . . . . . . . . 12-1 3
BAND CHART
(C1-C5, L1-L3) ........... 16
First Connections, Tests .............. 17
DC Power Supply . . . ... . . . . . . . . . . . . . . 18 ·
Operating, Experimental Features
........ 19
Troubleshooting Guide ................ 20
Getting to Know the Receiver ........... 21
What Frequency Am I On? ............. 21-22
T-KIT Limited Warranty ............... inside hack coli
·-IMPORTANT: Please read Warranty Te::-1
. BEFORE starting kit assembly. __j
... a quality electronics kit pro;ect From
T-KIT
a Division of TEN· TEC, Inc. .
1185 Dolly Parton Parkway
Sevierville, Tennessee 37862
(865) 453·7172
Fax (865}. 428-4483
Circuit board and manu·al Copyright(O 1994. All Right:; Reserved.

II
Introduction
The T-KIT 1 056 Direct-Conversion Receiver Module Board is the
result
of our looking over what's ·on the kit market and in
magazine
coostruction articles and asking ourselves if we can
offer something better at an attractive price. Our goal was a
simple receiver
which is genuinely useable. The 1056 Module
Board
may be finished as a stand-alone receiver for travel, den or
office, or incorporated
into you own back-to-the-basics
transceiver or
"trans-receiver" project.
The simpleness of NE602/NE612 direct-conversion receiver
design contributes
to the novel way we chose to packaue this
kit.· Instead
of stocking numerous one-band versions, pushing
you to make band choices
which you may not be ready to make,
we offer ONE model plus ALL the parts needed to put it on (or
change
it to) any HF ham band of interest to you. This is good
for both T-KIT and you: our inventory is much simpler, and you
.have everything in hand
to explore the reasonable capabilities of
your Model 1056 receiver board.
All frequency-determining
parts are packed in a clearly-marked
packet. SAVE
your unused coils and capacitors in this packet,·
T-KIT No. 1.056-LC. Doing so
will help later, whether for your
own new application or for giving or selling.
While designed
to be a single band receiver for casual monitoring
of a ham band, the Model 1 056 permits experimenting with both
frequency coverage and
transmit/receive applications. Please
remember
that experimenting is something we all do on our own
or with friends for fun. As nice as TEN-TEC tries to be to our
valued customers,
kit experimenting is NOT a process which our
staff can coach you through!
As you plan your use of this receiver module board, keep in mind
that the performance of ultra-simple receiver circuits deteriorates
as the frequency goes up,
particularly above 15 MHz. While this
kit includes all parts to try ham bands up to 28 MHz (we also
tried 6 Meters, but Engineering said "forget it"), please do not
expect the same stability on 12 or 10 meters as you will enjoy
on 160 through 30 meters.
1056- 5

T-KIT Model 1 056 Receiver Design Features:
0 Signetics NE612 mixer-oscillator
0 True varactor tuning (MV209)
0 Zener diode regulation
0 LM358 op amp bandpass filter
0 Front-panel bandpass control
0 Signetics TDA2611 A audio amplifier IC
a Stereo jack for economical "Walkman" headphones
a Plenty of speaker audio
a Separate "Bandset" and "Bandspread" tuning controls
0 RF gain control
a Provision for TX sidetone injection
a Provision for receiver audio muting during transmit
0 Frequency Counter output line from local oscillator
0 Efficient
6"WX2 ~ "D board layout:
take your favorite ham band ANYWHERE!
a Jumper provision for separate DC supply to audio IC
a Operates on 12-15 VDC .
Use this space (and page 4.), to plan your use of
the T-KIT 1056 Direct Conversion Receiver Module Board
Installing Parts
on the Circuit Board:
When
we say "INSTALL" a part, we mean:
0 Choose correct part value
0 Insert in correct PC Board location
0 Insert correctly, if there is a right way and wrong way
such as for the transistor and LED
0 Solder all wires or pins
0 Trim or "nip" excess wire lengths
1056- 6
Model 1 056 Circuit Descrip-tion
I The Schematic Diagram is printed on pages 12-13.
~-~
The efficient 'simplicity of this and similar receivers is made
possible
by the Signetics NE612AN mixer-oscillator, functionally
identical
to the well-known NE602. The NE612AN is used .
because
it is standard TEN-TEC inventory. L1, C1 and C2 form a
tuned
RF input circuit coupling the antenna to pins 1 and 2. The
dissimilar values
of C1 and C2 are selected for propBr impedance
matching. Potentiometer
R1 is an attenuator to minimize
overload
by strong signals and nearby AM broadcasts, therefore
serving as
RF gain control. The local oscillator frequency is
determined
by C3, C4, L2 (plus L3 on 80/75 and 160 meters),
plus the varactor
tuning network coupled through C5. Voltage
applied
through tuning pot R2 and R4 (1 OOK) to the MV209
varactor (D1) provides coarse tuning or "band set." The fine-
tuning
or "band spread" by R3 is done by coupling the control
voltage to D1 through R5, 1 megohm. As desired, changing the
value
of R5 will increase or decrease the fine-tuning rate.
Zener diode D2
(6.2V) regulates the voltage to the oscillator's
varactor circuit, supporting U1 's never-exceed Vee limit of 8V.
The output from pins 4 and 5 of U1 is low-level audio, the direct-
conversion result
of mixing antenna RF input with the variable
local oscillator frequency. This audio
output is coupled through
the filter network formed by R6-R9 and C1 0 to the inputs of op.-
amp U2a. The LM358 IC (U2a,b) is a dual op-amp. The voltage
gain·
from antenna input to U1 to U2a output is typically 68 dB.
The
other LM358 op-amp (U2b) and its associated components
serve
as an elementary bandpass filter, with front-panel filter
tuning done by potentiometer R16.
The output of U2b is coupled through C18 and Volume/AF Gain
Control R18
to the input of U3, the Signetics TDA2611 A audio
amplifier IC, using
the same general circuitry already proven in
TEN-TEC HF transceivers.
1056- 7

Model 1 056 Direct Conversion Receiver
KIT PARTS LIST
Before you begin construction, please take the time to sort:your
parts and check them per the following list. Please review the
Limited Warranty terms regarding any suspected parts shortage.
Quantity
Description and Value
Schematic
Fixed Resistors
The 3 color bands denote resistance value. The 4th band (gold) denotes 5% tolerance.
2 0 3.3 ohm (orange-orange-gold) . . . . • . . . . . . . . . R20,R22
1 0 220 ohm (red-red-brown) . . . . . . . . . . • . . . . • R21
1 0 680 ohm (blue-gray-brown) ......•......•. R15
2 0 3.3K (orange-orange-red) . . . • • . . . . . . . . . . . . R12,R17
4 0 4.7K (yellow-violet-red) . . . . . . . . . • . . . . . • . . R6,R7,R8,R9
1 0 10K (brown-black·o·range) . . . . . . . • • . . . . . . . R19
2 0 lOOK (brown-biack-yellow) . . . . • • . . . . . . . . . R4,R13
3 0 2/0K (red-red-yellow) . . • . . . • . . . . . . . . . . . . R10,R11,R14
2 0 1 megohm {brown-black-green) . . . . . . . . . • . . . R5,R23
Part No.
30109
30130
30136
30144
30146
30150
30161
30077
30173
Fixed Capacitors (common to all bands)
1 0 3 pF disc capacitor ." ....••..•.••......
2 0 150 pF disc capacitor ..•............•..
C25 23248
1 0 .001 pF (marked 102) .......•.•..•. : . . .
1. 0 .0033 JJF mylar film (marked 332) ...•.•.. · .. .
3 0
.01 JJF mylar film (marked 103) ........... .
4 0
.1 JJF disc (marked 1 04) •.................
·4 0 10 JJF electrolytic •..••...••.........•.
2 0 33 JJF electrolytic ......••....•..••..•.
2 0 470 pF electrolytic ...•........•.•.....
Integrated Circuits, Diodes: .
C11,C13 23388
C20 23245
C10 23288
C14,C15,C16 23340
C6,7,8,23 23261
C12,17,18,19 23266
C9,C21 23308
C22,C24 23228
1. 0 NE612AN or NE/SA-602 8-pin DIP IC . . . . . . . . . U1
1 0 LM358 op·amp 8-pin DIP IC • . • • . . • . . • . . . . U2
25319
25117
25299
28050
28055
1 0 TDA2611A, 9-pin SIP audio amplifier IC ....... U3
1 0 MV209 varactor diode . • . . . . . . . . • . . . •. . . • D1
1 0
6.2V :mner diode, type 1 N753A . . . . . . • . • . . . 02
Other Components, Hardware:
1 0 Circuit Board for Model 1056 ..•...........
5 0 1 OK front -panel potentiometer controls • . . • . . . . R 1-3.16,18
1 0 Miniature stereo jack . . . . . . • • . . • . • . . . . . . J1
1 0
Model 1056 instruction manual •...•..•.••..
REQUIRED, NOT SUPPLII:D:
0 Battery or regulated, well-filtered 8-15 Volts DC
. 0 Antenna for band of interest, or 1 0-20' random wire
0 Stereo h~tadphones or speaker
1056- 8
- 78249
30267
35252
74306
T·KIT Model 1056 Receiver Parts List, cont.
Capacitors (C 1-C5) per Band Chart for 160-1 0 Meters:
1 0 10 pF ............•................
1 0 15 pF ........................... .
2 0
22 pF •............................
1 0 27 pF .......•...................•
3 0 33 pF •.....•.... : . •.•...•......•.
3 0 47 pF ............•..•............
1 0 56 pF ...•.•.•....•..•..•......•.•
1 0 68 pF .•..•....•.....••.....•.....
1 0 91 'pF ......•.......••••...•......
2 0 .100 pF (marked 100 or 101) ............ .
2 0
150 pF (marked 151) ....•.............
. 2 0 180 pF (marked 181) ......•..........•
1 0 220 pF (marked 221 I ................. .
1 0 270 pF (marked 271 l ................. .
1 0 470 pF (marked 471 I ................. .
1 0 680 pF (marked 681 I ................. .
1 0 1000 pF (- .001 JJF, marked 1 02) •.........
1 0 4700 pF (-.0047 JJF, marked 472) ..•......
1 0 .01 JJF .............•.•..•...•.•.•..
Inductors (l 1, L2, LJ) per Band Chart for 160·1 0 Meters:
See Chart
"
"
"
C5 80/lliO
2 0
8.0 JJH shielded, tuneable coil (marked 30-32) . . . ll ,l2
2 0
5.8 JJH shielded, tuneable coil (marked 30-33) . . . l1.l2
2 0
2.8 JJH shielded, tuneable coil (marked 30-34) . . . l1,l2
2 0
1.3 JJH shielded, tuneable coil (marked 30-35) ••. ·L1,l2
1 0
8.2 JJH molded inductor (gray-red·gold·gold) . • . . • l3, 80M
1 0 47 JJH molded inductor (yellow-violet-black-gold) . . L3, 160M
MINIMUM TOOLS AND TEST EQUIPMENT:
0 15 to 35 watt soldering iron
0 · Diagonal cutters or wire "nippers"
0 Needle-nose pliers
0 Non-metallic alignment blade (for L 1, L2)
0 RF signal source or receiver/transceiver for initial alignment
USE ROSIN-CORE SOLDER ONLY,
233"11
23372
23374
23375
23376
23378
23379
23381
23384
23385
. 23388
23389
23396
23397
23400
23402
23282
23293
23260
21055
21056
21057
21058 .
21123
21160
of a type intended for electronic PC-board assembly.
(Available at electronics distributors or Radio Shack stores.)
DO
NOT use hardware store solder, paste or flux.
Solder contains LEAD: wash hands before eating!
1056. -

. CX2 =~
. ~z . a: ~
·:. (]nQ w:rnm_ "~ ex
+"" ... Oom
'•, . u u + ....
[@?~ ~ Bl;::Jcf u
D~ tns~~i0+
1
~~
uQ~>tdS . (!00 ... gjEJ·
O
OND · i·
. 91 ::J· <:::::> • · ..
O
aND .I'""QnM. · ~· .·,:
. ~ ~·\!5 ... ~ ·:;. ':·
n~1 ~
01
o·a~Oijl!l.lj ;
~ .,~~ elid'
l.. . ;;;}'~:~ ;::~ :;~~t~!
1'''•·••>· . ··~·. ,,.;~ I i:li!f, ~!i! • '
~1~::~~~/j·~S~~J, , ~-~ j
u w . ..J ... "" i;L. Q . , ·,
.· :.u; w.9~ .0 ~ LJ ~ ;: ~;
f- W·J~ · ·u '· · , ...
u- -~ QL-J .n
0
·
·· ·~c.·. · .. ... ::·.
w-· . u .......... , ·:· :··
rv··'•. · :r:.: .·§· ~ .. .;or;:/ j
I.Lj. , . []] " • 1'- CD .• 2; •CN .
..... ·. ·· ""0. D! .. · · .,_a: ..... -itt I
0 . ·.- ,. "' u ;!. . .·'· ~ ~ ><l.l!J,., ;•
. . .· . :· ,..J ,: . '>,-' E · .. '~;!t '· ~ ·'T"' •
em rlD B!J. ·-~ :· o::-; ·'··-··
. c:> .. . ,; ... '-:» ....
::J b>::J .
o~~ Q+~o:Q ··~ · .. _t)o=G·.
I . . a: -
' _. <::::> 0 0!
~0 u ' c::; lJ...
a: 01!
1056- 10
,'tJ
..
~
.1:::
a
cg ·=
11)0
Oot-
.-o
Q)~
"tJCD
~>
~~
I I
t-><
"C
c ...
10 :I
'"C 0
~~
10 "C •
..!!!a>E
U.!::: Gl
• :I ti
"C cr >
~I!!U)
UUICI
"ai "E .5
' 10 ...
>-c Q)
)(C::2
omo
g,+-' '{'
Q)U)Q)
U) .c >
U) CliO
.,!!:C~
CIQ)"'O
>£ Ql
:!:: 0 ·~
m.......
::J._.Q)
crc"C
U)IOO
~c.E
... u-o
10
w c
01- 10
.OoU)
.t:! z Ql
::JW C
ul-==
.!::: Q) >
u.c-
1-...,.o
-cE
~·- a:l
I U)
1-~UI·
._...,m
::JC.:.
o·.: g!
>- a..-
.. c. CD
w Ql u
1-mUI
0'-c
Z
oro
UIP
Circuit Board
Assembly Steps
The basic assembly procedure will be to install all parts common
to all bands first, leaving the frequency-determining parts for last.
The component outlines si/kscreened on the top side of the board
make the
location of parts reasonably obvious with minimal need
for written explanations. There is no "wrong" order to "stuffing
the board, "as many electronics buffs like to do it, but it is quite
common even for very experienced builders to make mistakes in
parts values or in orienting one-way-only parts. Therefore, we
encourage you to take
advantage of the check blocks, parts
descriptions and.other information in these construction steps.
0 0 1. Install C21, a 33 JJF electroytic capacitor. This is your one
detailed reminder
that all 8 of the electrolytics used in this circuit
MUST be installed
with correct polarity. The ( +) side is clearly
·marked on the
top of the circuit board. The ( +) side o·f the.
capacitor itself is the longer of the two wires, and the (-) side is
designated by the dark stripe.
0 0 2a. Insert U3, the TDA2611 A SIP audio IC. Before soldering,
make sure
that the front (imprinted) side faces C21 just installed,
and
that the IC pins are pressed into their boarg_ holes as far as
they can go. (Notice also that the banded end of the imprinted
side
of the IC corresponds to the notch on the board silkscreen.)
0 0 2b. Solder the 9 ·pins of U3 per 2a, taking care not to form
solder bridges across the IC's pads.
0 0 3. Install C20, .001 JJF (marked 1 02).
0 0 4. Install C22, 4 70 pF electrolytic, with correct polarity.
0 0 5. Install C24, 470 JJF electrolytic, with correct poJarity.
0 0 6. Install C19, 10 JJF electrolytic, with correct polarity.
0 0 7. Install C18, 10 JJF electrolytic, with correct polarity.
To complete the audio
output section of the receiver,
install
the following parts:
0 0 8. Stereo Jack J1.
0 0 9. AF Gain (Volume) 1 OK potentiometer R18.
0 0 10. R19, 1 OK (brown-black-orange).
0 0 11. R20, 3.3 ohms (orange-orange-gold).
0 0 12. R22, 3.3 ohms (orange-orange-gold).
0 0 13. C23, .1 JJF (marked 1 04).
• Pp. 12-13: Schematic. Assembly steps continue on page 14.:
1056- 11

T-KIT No. 1056 Direct Conversion Receiver
ANTENNA
'>--;),
at
.rc:--
WI
101(~
~
!~
(Rr CAH(
Cl
1.a-l.t
1000
3.5-4.0 110
7.11-J.J
II
~~
tl
14.0-14.35
47
ILOI-18.17
..
21-21.4S
.,
24.1t-2Ut
JJ
, .. n-n.s J1
1:
co
4100
-
4'10
410
220
110
Z"'
110
uo
Ll
Cl
110
150
110
100
47
u
.,
ll
u
.!.i-> >A
r-tL_J4 -~----------=CI:-3 .J
J, u,.. ·~\·
C5
~·
4.71(
ft7
·4.71(
CIO
AOJl
....
4.71(
Ill
4.71(
J
en
II~
1110
2ZGIC
•• .1. C12
ll0/2$
~"
:rzoN
2
.II(
¥
>>8
+9·12VDC +12VDC
L%
lJ
r
• « r-;~--
1121
120
C4
c:s
Ll
L%
110
..,,
1.0 1.0
uo
.01 1.0 1.0
lila ..
•••
u
100 IS 2.1 ,
..
.,
IS u 2.8
JZ
10 1.3 ,
..
.,
10
,,
I.)
JJ
10
t.l u
JZ 10
1.3 l.l
~
LJ
41
8.2
-
-
-
-
-
-
-
8 <<-+----...1
011
r--s!J
""
101(
•u
810
cw
~
-·-------~---
SllltrotC J.
trvl
1122
J.lQ
HEADPHONES
Cl4
> ':.\' ~ 'j:' j ;; ~ ·~ rv I
~ai -
,r~·

PROGRESS NOTE
At this point, the audio outpl.\t stage works, if all parts have been
installed correctly per steps
1-1 3. If you enjoy keeping track of
progress, use a highlight m£trker to color the portions of the
schematic
now completed.
w0 14. Install U2, the LM358 op-amp IC, making sure that its
band, notch or
dot is aligned per the board drawing, facing
toward U3.
Install the remaining
electrolytic capacitors, being attentive to.
correct polarity as explained in Step 1.
0 0 1
5. C17, 10 pF
0016.C12, 10pF
0017.C9,33pF
Install these components of the ~M358 dual op-amp circuitry:
0 0 18. R1 0, 220K (red-red-yellow)
0 0 19. R1 f, also 220K
0 0 20. R14, also 220K
0 0 21 . C11, 1 50 pF (marked 151)
0 0 22. C13, also 150 pF.
0 0 23. R12, 3.3K (orange-orange-red)
0 0 24. R17, also 3.3K
0 0 25. R21, 220 ohms (red-red-brown)
. 0 0 26. R13, 1 OOK (brown-black-yellow)
0 0 27. C14, .01 pF film capacitor (marked ·1 03)
0 0 28. C15, also .01 pF film
0 0 29. C16, also .01 pF film
0 0 30. R15, 680 ohms (blue-gray-brown)
NOTE: The installation of jumper wires in stegs 31 and 32
presume you are setting up the board for us€ as a receiver only,
not part of a transmit-receive combinatiorf, and that you will use
a single
12-volt DC power source. The JM2 "MUTE" jumper
wire would be replaced by a shielded line to the T-R switching
system of a transceiver or transmitter. The jumper "JM 1" at
+ 12V provides flexibility in battery or power supply connections,
which are discussed
later in "Power Supply Considerations. "
0 0
31 . Using bare wire nipped from a resistor already installed,
make a staple-shaped
jumper wire; install it at "JM2" (MUTE).
0 0 32. As in Step
31, install a jumper at "JM 1'" (+ 12V).
0 0 33_. Install Bandpass Control R16, 1 OK potentiometer.
1056- 14
Progress Test (Optional):
With all· parts now installed except the NE612 with its RF input,
oscillator, and AF
output circuits, this is a logical point to check
the operation
of the full U2/U3 audio circuit, if you wish. To do
so, follow this procedure: · ·
0 Check
first that Steps 1-33 have been completed correctly.
0 Connect stereo-headphones
or speaker
0 Turn the Bandpass and AF Gain
controls fully clockwise
0 Temporarily
connect 12 volts DC, being careful about polarity.
0 Holding
the shaft of a screwdriver (or a length of bare wire),
touch the end of R19 nea.rest C19: you should hear a distinct
60 Hz AC buzz.
0 Rotate the Bandpass control:
you should har a distinct change
in the
pitch of the background hiss.
0 Disconnect
the 12 volts DC wires.
If you do-not observe these results, or if you get extra noises
such
as a howl, squeal or putt-putt, please double-check all parts
installed before proceeding
further.
Install the remaining 1 OK front panel controls:
0 a 34. R1, RF Gain
0 a
35. R2, Tuning
0 0
36. R3, Bandspread
0 0
37. Install U1; the NE612AN IC, making sure that its banded,
notched end is oriented per
the outline on the board. If you
.choose
to use an 8-pin DIP socket for U1, use the same care in
solderil"ig the.
socket as you would for the IC itself.
Install
the R-C network between Ul and U2:
0 a 38. R6, 4.7K (yellow-violet-red)
O·a 39. R7, .4. 7K
·P 0 40. R8, 4.7K
0 0 41: R9, 4.7K
0 0 42. C1 0, .0033 film capacitor (marked 332)
0 0 43. Install D1, the MV209 varactor diode. Let the diode body
seat
firmly against the board before soldering, and be· sure to
orient the flat side of this transistor-shaped component per the
outline
o·n the board.
P 0 44. Install the zener diode, D2, making sure that the banded
cathode
·end is oriented with the stripe on the board outlne.
10.56- 15

Install these remaining parts common to all bands:
0 0 45. C6,
.1 pF disc capacitor (marked 104)
0 0 46. C7, also
.1 pF
0 0 47. C8, also .1 pF
0 0 48. R4, 1 OOK (brown-black-yellow)
0 0 49. R5, 1 megohm (brown-blijck-green)
0 0 50. R23, also 1 megohm
0 0 51. C25, 3 pF
This completes installation
of parts common to all ba.nds. If there
is no question in your mind about which band you wish to set
up, final parts installation is only a matter of selecting the correct
values for C1-C5, L1-L3, and installing
them in the normal way.
If you plan to "tinker"· with several bands before making a final
choice, you can make desoldering a
bit easier on yourself by
leaving an extra 1 /8" or so of lead length between capacitors and
the board, and soldering
only one of the two legs on the··coil
shields.
If you do change parts, be gentle so as not to damage
the copper traces
of the board, or the parts themselves.
T-KIT 1 056 Direct-Conversion Receiver
GUIDE TO FREQUENCY-DETERMINING PARTS
C1
C2 C3
C4 C5 l1
l2 L3
160
.001
.0047
180 180
.01
8.0pH 8.0pH
47pH
80
180 680
150 150 .01
.a.o
8.0 8.2
40
91
470 150 150
68 5.8 5.8
jumper
30
91
470
100 100 15 2.8
2.8 jumper
20
47
220
47 47 15 2.8 2.8
jumper
17
56 270
22 22
10
1.3 2.8 jumper.
15
47 270
47 47
10 1.3 1.3
. i_umper
12
33 180
33 33
10
1.3 1.3
jumper
10
27 150
22 22 10 1.3
1.3
jumper
Complete identification data for the 1 056-LC Band Change Parts
Kit
is provided in the Kit Parts List on page 9. Before soldering
the parts in Steps
52 through 59, write the correct value in the
blanks provided on the
following page.
1056- 16
I
Install the following parts for the Meter Band:
0 0 52. C1, value
0
0·53. C2, value--
0 0 54. C3, value --
0 0 55. C4, value--
0 0 56. C5, value==
0 0 57. L1, value marking
0 0
58. L2, value -- marking --
0 0 59. L3, value==:: color code _______ _
• A wire jumper MUST be installed at L3 if a coil is not required.
First Connections
The minimum connections needed to test the receiver are wires
for DC power, an antenna or random wire, plus headphones or
speaker. The normal color code
for DC power is red for positive
and black
for negative. We recommend using stranded hookup
wire rather than the solid type: solid wire is prone to breaking
easily. Before connecting 1
2VDC, it is worth the effort to go
back over
your work, checking for:
0 Quality of solder points
0 Completeness
of soldering work (it's easy to miss one)
0 All excess
wire leads trimmed ·
0 No
wire scraps lodged between solder points
Initial Tests, Adjustments
Before applying DC voltage, place the finished and double-
checked board on a clean, non-metallic
work surface. If you are
ready to do so, oscillator alignment will. go more smoothly if the
board is already
mounted to its intended chassis or panel, or
clampedin a small vise. This is true especially for frequencies
above
14 MHz, which can be affected by tiny capacitance
changes
of the board being moved around on another surface.
Set the controls as follows: RF Gain- maximum (clockwise);
Tuning, Bandspread,
Bandpass- mid scale; AF Gain- as desired.
Adjustment of coils L1 and L2 must be made with a non-metallic
alignment
tool. If necessary, such a tool can be made easily.
from a plastic shaft, wood dowel, etc.
1056-17

1
11
!j
The oscillator coil (L2) is adjusted to the desired frequency either
by listening
for the oscillator signal in a nearby receiver, or by
tuning.the coil until you ·hear a desired reference signal with the
1056 receiver itself. That signal can be from a signal generator,
VFO, QRP transmitter, or familiar activity on your favorite band.
·After getting L2
"in the ballpark," adjust L1 for maximum signal
strength, reducing
the RF gain as needed to hear the effect of
adjusting L1. Use the Tune control and· minor adjustments of L2
to ensure satisfactory coverage of the band.
Final Assembly
Enclosure, knobs, switching, connectors: selecting these yourself
.
is part of build.ing any T-KIT Module Board. If you want to use a
T-KIT Enclosure-PLUS
hardware/enclosure package, the 1 OOOC ·
pak was designed
with this 1056 receiver project in mind.
DC Power Supply Considerations
The ideal DC voltage source for the receiver is a 12 volt battery.
A
12-15 VDC power supply with very good filtering may also be
used. Separate DC supply lines, normally connected by the
jumper wire, are provided for audio IC U3 and the rest of the
circuit, allowing you to experiment with the various power paks ·
or batteries you have on hand. For
exampl~. a wall-plug-in DC
power module may work fine for audio output but introduces
unacceptable hum or ripple to the receiver front end. Solution:
try a battery for 12V-A and use the wall supply for 12V-B.
Or, you may want to make the unit ultra-portable, using 8 or 10
"AA" alkaline cells: you may wish to ruri only the audio amplifier
from the
12-volt battery pack, and use a· separate 9V battery for
the U1/U2 circuitry. The primary advantage of the dual voltage
input
is to increase the usef.ul life of the batteries. When the ·
batteries are longer prime
but still useable, the current demand of
the audio IC causes voltage fluctuations which can destabilize
the oscillator and
tuning circuit.
0 If you prefer a 9V battery for the NE612/LM358 circuitry,
change R21 from 220 ohms to 1 00 ohms.
1056- 18
Oper~ting and Experimental Features:
The following details are provided for your convenience in
experimenting
with or adapting the receiver board to ham-band
transmit/receive setups.
DC Power Inputs: See preceding section.
Sidetone
Input: Used with the 'MUTE feature.(see below), this
direct access
to the input of U3 permits injection of a CW
sidetone or DSB/SSB audio
while transmitting. The level of such
audio injection
must b.e controlled BEFORE it reaches this point in
the receiver circuit, because
the Volume control (R18, AF Gain)
will have no
effect .
Mute: Ordinarily shorted by a jumper wire, this pair of pads on
the board makes
if easy for you to use a T-R circuit to silence the
receiver during
transmit (while still permitting sidetone or other
audio monitoring).
Bandspread: Notice on
the schematic that this control functions
in parallel
with the Tune ("Bandset") control. The rate of
frequency change is determined by the value of R5, 1 megohm.
The value
of R5 may be changed to suit personal operating
preferences and
the band of interest. Increasing R5 will lowef
·the frequency change rate, and vice versa. Because tuning
higher frequency bands rectuires less change in capacitance, both
tuning controls
will cover much more spectrum at. say, 15 or·.1 0
meters,
than when tuning 160 or 80 meters. ·
Freuency Counter
Output: This connection to pin 7 of U1
.through R23 and
C25 is an option included for experimental
hookups
of frequency counters to display the oscillator
frequency. Some counters
may require a buffer amplifier stage.
Any
counter hookup ~hould us~ the shortest length possible of
mini-coax (RG174),· because
coax and the counter input circuit
adds capacitance
to the oscillator circuit. Some counters may
intro~uce unacceptable !evels of clock noise.
Speaker
Output: Connecting headphones ·interrupts the speaker
output line. The best speaker performance will come from good
.quality speakers in well-designed enclosures. An unenclosed
speaker laying on a
workbench will not be impressive~ The
headphone
jack also permits use of mini stereo speaker systems
available inexpensively
for personal radios, CD players, etc.
Band Parts Kit: Keep the extra parts together for future use.
You
may wish to try a different band or experiment with band
1056-19

'!I
'
tl
'
:I
:,:,11
j:l
J,
switching ideas. Please be aware that we do not sell individual
parts or provide technical
support for experiments. The 1 056 is
designed
to be a one-band receiver. ·
Before trying
ANY of the experimental features or capabilities of
the receiver, make certain that it is functioning as designed.
Troubleshooting Guide
General: This kit project is designed to work as specified if the
right parts
are selected and installed correctly and all connections
are niade as explained in this manual. The #1 cause of problems
in most kit projects is
exactly what we tend to take for granted:
a mistake or broken
wire in the connecti.on of external items to
the circuit board, such as DC power, speaker, switches and so
forth.
After that comes a mistake on the board itself, such as:
0 Incorrect part value
CJ Reversed orientation of diode, IC, electrolytic
capacitor or other part which rt:lUSt be installed
in one direction only.
0
Bad solder connection (cold joint or bridge)
Specific Hints:
Be sure to double-check the following:
0 Did you install required ju,mper wires?
0 Did you choose
correctly from the Band Parts Chart?
Common Experiences and Remedies:
0 Strong
60 Hz AC hum even when using battery power.
Antenna coax shield needs to be grounded to bot{! receiver board
and earth ground.
0 Steady high-pitch hum
Receiver or .antenna is too close to a computer, frequency
counter or other microprocesser device. Something has to move!
0 All CW signals are chirpy
Weak battery. See "DC Power Supply Considerations." .
0 Receiver oscillator seems unstable during· first bench tests.
Reasonable stability requires secure mounting in enclosure.
This T-KIT Module Board is designed to encourage and help you
to solve problems yourself.
If you are stumped after following all
our suggestions, please
consult the T-KIT Limited Warranty
published in this manual.
1056- 20
Getting to Know the Receiver
If ·you already, are familiar with direct-con~ersion receiver
characteristics,
you should find this one to· be a good performer.
If this kind of receiver is new to you, there are several facts to
learn about. First, unlike the typical ham transceiver, you .will
hear
both sidebands of a CW or SSB signal. To tune USB (20
met~rs and above) tune "up" the band to the point where the
signal becomes intelligible.
To tune LSB (J 60-40 meters), tune
"down" to the point at which the signal becomes ii1telligible.
The receiver is
quite sensitive but uses a very simple RF input
circuit. It is possible for strong. AM broadcast stations, whether
local or
shortwave, to overload the circuit. Ordinarily, this
problem is minimized by reduCing the RF gain slightly .. This kind
of circuit also is susceptible to power supply hum, which is why
battery operation is often preferable.
The variable Bandpass
control is a feature rarely found in so
simple and inexpensive a receiver.
Simply adjust it for the best
sound quality
of the signal. CW signals are tuned in best with a
lower bandpass frequency (counterclockwise), while SSB will
sound best with a higher bandpass frequency.
As you react to the performance of your receiver, keep in mind
that variable-oscillator stability (susceptibility to temperature
c:hange and mechanical vibration) becomes progressively more
critical
as frequency is increased. From 160 through 30 meters,
this receiver
will serve as well as many of the simpler superhets
of several decades ago. From 20 meters on up, more attention
must be given to how you package and handle the receiver.
What·Frequency Am I On?
The most complex and costly single section of ANY receiver,
past or present, is
the mechanical or electronic system used for
displaying the frequency. Of course, there could be a series of
T-KIT direct conversion receivers, even multi-band models, with
well-calibrated dials or digital displays. And, of course, this
would be an entirely different price class of receiver which, for
just a few dollars more, would best become microprocessor-
controlled dual-conversion
circuitry.. ·
The handiest
fact about direct-conversion receivers (and also
regenerative receivers
such as T-KIT 1054 and 1253) is that the
oscillator frequency IS
the receiving frequency ... letting you
1056 .. 21

Iii I
i
!111
use any digitally-accurate receiver/transceiver to listen to the
oscillator signal for creating a simple tuning scale covering the
one frequency range of interest to you. (After all, it is not likely
that you
bought this receiver in order to use your soldering iron
as a bandswitch!) While it can be set up for any band, you want
it for ONE band, your favorite, probably one segment of that·
band. Once you decide how you want to use this receiver, the
one-time process
of creating a neat dial scale will be easy and
rewarding, regardless
of whether you use classic or computer-
style panel designing.
The option of trying a frequency counter is included on the board
strictly as a convenience for experimenters. We make no claims
of how satisfactory or successful this will be. For recent
information on constructing a counter circuit specifically intended
for use
with a NE602-type direct conversion receiver, see
Communications Quarterly, Winter 1994, pages 25-46.
Concluding Note
First, thanks for yqur interest in T-KIT by TEN-TEC! We think
this Model 1 056 DireCt Conversion Receiver circuit design sets a
new standard for varactor-tuned NE61 2/602 direct-conversion
receiver kits in this price range.
Pick
your banc,j, use your creativity to finish up your T-KIT
Module Board receiver, and ENJOY it for what it is! ·
1056- 22
T .. KJT Limited WARRANTY
Please read carefully DEFORE building your kit.
This Limited Warranty applies solely to KITS sold by TEN·TEC, Inc. under the tradli nama "T·KIT."
The t1rma of this Warranty do not apply to other products of any kind manufactured by TEN· TEC,
Inc., nor shall any other warrantias published by TEN·TEC, Inc., or any TEN·TfC customer service
policies lor its manufacturad products, ba construed as applicable to T -KIT products.
I. All components and hardware supplied. as parts of a kit are warranted to be free from manufacturing
defect for ona year from date of purchase.
2. The original purchaser has the option of axamining tho kit and manual lor 30 days. · II you choose within
this period not to construct the kit, you may retwn the entire unassamblad kit at v.our own expanse lor lull
credit toward any other TEN· TEC product, or a refund, lass .original shipping/handfing chargas.
3. This warranty is voided if acid-cora soldar is usad in construction. USE ROSIN-CORE SOLDER ONLY. of a
grada dasignad for electronic PC-board assembly. WARNING: soldar contain LEAD, which is known to causa
birth defects or other raproductiva harm. Avoid breathing solder lumas, which may causa pubnonary irritation.
or damage. After handling any solder, wash hands with soap and water before eating.
4; TEN- TEC, Inc. warrants this device to function as dascribed in its documentation provided that it is
assamblad and used correctly in accord with all printed directions. It is·your rasponsibility to follow all
directions in the instruction manual, Iii identify components correr.tly and to usa good workmanship and
proper tools In constructing this kit.
&. We do not accept the ratwn of partially-assembled kits for repair or rafund.
8. If you beHave a kit part is missing. do 1 thorou~ sorting of all parts, checking each off on tha parts fist
in the manual. Check al bags, anvllopas or boxes carefully. Simply call, fax, or write, and we wiU promptly
replace 1ny missing put. Evan if you lind an uact raplac-t parts locally, please notify us so we may
assist other customers.
1. If yow kit doas not work altar flnllassambly, plaan follow lhasa three steps in order: _
A. DouWa-chack EVERY slap In tha auamllly manual and any troubleshooting tips provided.
D. Ask an axp.riancad ham er habbyist friand review to your work. Atrash sal at ayes can
catch a detail which you may have ov.rloohd.
C. If necessary, you ara welcome to uk lor T-KIT Tachnical Assistance at 463-7172.
IT echnical. Assistance far T·KITs is ev.ileble ONLY through THIS number.)
B. Factlll'y Inspection or Service. If you wish to return a ·kit for professional inspection or re~air, there is
a minimum charga of $20.00, payabla by cash, check, money order or credit card charga authorization.
Thera is no naad to call or write for authorization; simply sand your kit with a nota uplaining the problem,
and provida authorization to make repairs at prevailing hourly shop ratas. To minimize extra cost to you wa
raserva the right simply to sand you replacement parts with notas on how to solve your problem. If we lind
that a part was defective in manufacture, there will be NO CHARGE to repair your kit unit. Our technicians
will make the determination whather 1 part was defective in manufactura or was damaged during installation.
9. TEN- TEC, Inc. raservas tha right to revise this Limited Warranty, to change or discontinue any kit product .
or ravise its instructon manual with no fiabiUty to previous purchasers. Howavar, if you complata the Kit
Registration form suppliad wilh all kits, you will receive periodic tfJChnical news from us, including tips,
spacial olfors on upgrades. Individual kit manuals may contain Warranty axtansions or Umitations lor that
specific kit product. ·
10, TEN·TEC. Inc., is not liabla for any consoquancas from usa or abuse of any T·KIT or part conlainad
tharein.
T·KITS BY TEN·TEC
A division of TEN-TEC, Inc. • 1186 Dally Putan Parkway • Sevierville, Tennessee 37862