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Small Wonder Labs PSK-40 Instructions Manual

Transceiver board kit
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Thanks for purchasing one of the Small Wonder Labs "PSK-40" transceiver kits!
Please take a few moments to look over the sections entitled "First Things First" and "Building Instructions"
before you dive in. These sections contain information which is key to your success with this kit
Note: This version of the printed-circuit board features all through-hole capacitors and only one SMT part
(U8). Please refer to the enclosed sketch for placement of .01 disk capacitors and IC sockets for U3 and U7 and
install those components during assembly. The parts list has been revised to reflect this
Small Wonder Labs™
PSK-40 Transceiver
Board Kit Instructions

TABLE OF CONTENTS:

First Things First.....................................
Materials ...................................................
Parts List ...................................................
Theory of Operation ........................... 6
Schematics ................................................. 8
Pictorial Drawing...................................
"Hooking Up" ................................
Alignment ................................................
PSK-40 Transceiver Kit
03/09/10
change.
2
3
4
10
22
23
25
©2000
1

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  • Page 1: Table Of Contents

    PSK-40 Transceiver Board Kit Instructions Thanks for purchasing one of the Small Wonder Labs "PSK-40" transceiver kits! Please take a few moments to look over the sections entitled "First Things First" and "Building Instructions" before you dive in. These sections contain information which is key to your success with this kit Note: This version of the printed-circuit board features all through-hole capacitors and only one SMT part (U8).

  • Page 2: First Things First

    • Schematic (most trustworthy) • Parts list The PSK-40 board is double-sided and all holes on the board are plated-through. This means that you do • Pictorial not need to solder on the top side of the board.

  • Page 3: Materials

    It may be necessary to pull the component out from the top side of the board while You'll find the following items with your PSK-40 kit: heating the joint. Leave the iron tip on the board only...

  • Page 4: Parts List

    5% C0G cap, monolithic '102' or '102J' C2,5,6, 14,16,C30-32, .01 uF disk capacitor "103" or "103M C101-106,C108-C117, C122-124 C15,19,39,C118,C119,C121 .1 uF monolithic cap '104' C21,C22 1 uF electrolytic cap 3.3 uF electrolytic cap Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...
  • Page 5 Org-org-org-gold R31,R59,R62 " Yellow-viol-org-gold 510K " Grn-brn-yel-gold " Brn-blk-grn-gold 10.7 MHz IF Transformer, metal can "42IF123" FT50-43 4 turns bif. winding,see text grey toroid U1, U6 TUF-1, TFM-2 Mixer 4-pin metal can Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...

  • Page 6: Theory Of Operation

    R20 attenuates this signal down down a termination for the mixer. The post-amp is followed by 'soundcard-friendly' level. a 6-dB resistive attenuator with two-fold purpose: it Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...
  • Page 7 This situation would lead to soundcard feedback/distortion on receive without the presence of this muting function. Q6 is an emitter follower which provide a 51-ohm source termination for diode-ring mixer U6. U6 is Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...

  • Page 8: Schematics

    Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...
  • Page 9 Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...

  • Page 10: Pictorial Drawing

    TUF-1 Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...

  • Page 11: Building Instructions , General

    Once you've stuffed the parts on is cathode the board, bend the protruding leads slightly outward to keep them in place while the board is inverted for Diode-Schematic soldering. Installation- Pictorial Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...

  • Page 12: Grouped Assy. Instr

    Install an 8-pin IC socket at U5. Match the 'notch' orientation as shown on the silkscreen. Install resistor R25 (10K, brn/blk/org). Install resistor R27 (10K, brn/blk/org). Install resistor R29 (10K, brn/blk/org). Install resistor R28 (22K, red/red/org). Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...
  • Page 13 Install electrolytic cap C20 (3.3 uF). Observe the installation polarity as shown on the silkscreen. Install R21 (1 Megohm, brn/blk/green.) Install R23 (10K, brn/blk/orange). Install R22 (33K, orange/org/org). Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...
  • Page 14 Spread the wire leads apart outward, taking care not to bend the leads right at the capacitor body. The wire leads may then be re-bent a few mm away from the capacitor Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...
  • Page 15 Install R5 (1K, brn/black/red). Install R6 (470Ω, yellow/violet/brown). Install R7 (10Ω, brn/black/black). Install R8 (100Ω, brn/black/brown) Install (2N2222, small metal-can transistor). Align the tab on the device rim to match that of the silkscreen. Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...
  • Page 16 Caution: This component should be spaced slightly above the board. Solder only 1 of the 4 pins into place initially. Adjust component spacing above the board while briefly reheating this connection, then solder the remaining connections. Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...
  • Page 17 Note: observe component spacing precaution as with U1 on the previous page. Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...
  • Page 18 Install R44 (220Ω, red/red/brown). Install R45 (22K, red/red/orange). Install R46 (100Ω, brn/black/brown). Install Q9 (MPSH10, from antistatic bag). Match the orientation of the flat side of the component to that of the silkscreen. Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...
  • Page 19 Install Q10 (2N2219, from antistatic bag). Space this component 0.5 to 1mm above the board surface to prevent shorts to the transistor case. Observe the component's tab orientation as shown on the silkscreen. Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...
  • Page 20 Install C40 and C43 (330 pF monolithic caps , Wrap this wire-pair snugly around the toroid '331J'). for one complete turn. It should look like this: Install C41 and C42 (680 pF monolithic caps , '681J'). Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...
  • Page 21 Caution: do not substitute a metallic nut here! You may find it easier to pin the transistor and heat sink together with the machine screw, using a fingertip to hold the screw Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...

  • Page 22: Hooking Up

    There's no minimum order, The figure below shows the interconnect between and they can be reached at [800] 524-6464 for a the PSK-40 board and the outside world (more on catalog. Ten-Tec also offers a complete line of alignment later) enclosures, and they support small orders as well! Call [800] 231-8842 for a free brochure.

  • Page 23: Alignment

    3.5mm (1/8") 3-conductor Alignment Instructions cable. Connect your computer speaker cable to the PSK-40's J2 connector. J2 and J3 are If you have not already done so, install all in parallel and permit use of the soundcard DIP ICs in their respective sockets.
  • Page 24 Caution: You must perform the receiver alignment at TP2. before aligning the transmitter! Remove DC power from the PSK-40, connect Readjust inductor L8s and L9 - in that order- the serial port cable (see 'Hooking Up'), and for maximum indication.

  • Page 25: Troubleshooting The Psk-40

    Ensure that DC power is getting to the PSK-40. A board with no voltage anywhere probably isn't getting power. • The figure below illustrates IC pinout. The "pin 1 at lower left" convention applies to all Dual- General guidelines: Inline-Package (DIP) ICs.

  • Page 26: Appendix 1: "Frequently Asked Questions

    If it's just a pair of vertical lines, it's an 'idling' pattern and there's no information being sent. If the signal is badly smeared by propagation conditions, the phase information may be lost - PSK31 is susceptible to polar (auroral) flutter. Small Wonder Labs™ PSK-40 Transceiver Kit 03/09/10 ©2000...

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