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Small Wonder Labs PSK-20 Instructions Manual

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Table of Contents

Thanks for purchasing one of the Small Wonder Labs "PSK-20" 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
Small Wonder Labs™
PSK-20 Transceiver
Board Kit Instructions

TABLE OF CONTENTS:

First Things First.....................................
Materials ...................................................
Parts List ...................................................
Theory of Operation ........................... 6
Schematics ................................................. 8
Pictorial Drawing...................................
"Hooking Up" ................................
Alignment ................................................
Appendix 1: "Frequently Asked Questions".........26
PSK-20 Transceiver Kit
03/09/10
2
3
4
10
22
23
25
©2000
1

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  • Page 1: Table Of Contents

    PSK-20 Transceiver Board Kit Instructions Thanks for purchasing one of the Small Wonder Labs "PSK-20" 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 TABLE OF CONTENTS: First Things First........

  • Page 2: First Things First

    • Everything else The PSK-20 board is double-sided and all holes on the board are plated-through. This means that you do not need to solder on the top side of the board. "This manual vs. QST":...

  • Page 3: Materials

    MATERIALS- will eventually delaminate (peel off) if overheated. You'll find the following items with your PSK-20 kit: If that still doesn't do the job, it may be necessary to cut the offending part off on the top side and pull the 1- bag of small parts (resistors, caps, wire, etc) remaining leads through with pliers.

  • Page 4: Parts List

    "103" or "103M C101-C106, C108-C117,C122-124 .022 uF monolithic cap '223' C15,19,39,C118,C119,C121 .1 uF monolithic cap '104' C21,C22 1 uF electrolytic cap 3.3 uF electrolytic cap C18,C23 10 uF electrolytic cap 47 uF electrolytic cap Small Wonder Labs™ PSK-20 Transceiver Kit 03/09/10 ©2000...
  • Page 5 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 or Mixer 4-pin metal can TFM-2 MC1350 IF Amplifier IC 8-pin DIP pkg Small Wonder Labs™ PSK-20 Transceiver Kit 03/09/10 ©2000...

  • Page 6: Theory Of Operation

    6-dB resistive attenuator with two-fold purpose: it Because the active soundcard inputs are always active, provides a stable load to the post-amp and reduces even during transmit, the receiver must be 'muted' filter passband ripple. Small Wonder Labs™ PSK-20 Transceiver Kit 03/09/10 ©2000...
  • Page 7 Q6 is an emitter follower which provide a 51-ohm source termination for diode-ring mixer U6. U6 is driven by a signal from the 9MHz LO, Colpitts oscillator Q7 and associated components. The output Small Wonder Labs™ PSK-20 Transceiver Kit 03/09/10 ©2000...

  • Page 8: Schematics

    Small Wonder Labs™ PSK-20 Transceiver Kit 03/09/10 ©2000...
  • Page 9 Small Wonder Labs™ PSK-20 Transceiver Kit 03/09/10 ©2000...

  • Page 10: Pictorial Drawing

    TUF-1 Small Wonder Labs™ PSK-20 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-20 Transceiver Kit 03/09/10 ©2000...

  • Page 12: Grouped Assy. Instr

    1 uF Install an 8-pin IC socket at U5. Match the 'notch' orientation as shown on the silkscreen. (Y10) Install resistor R25 (10K, brn/blk/org). Install resistor R27 (10K, brn/blk/org). Small Wonder Labs™ PSK-20 Transceiver Kit 03/09/10 ©2000...
  • Page 13 Install C106 (.01 uF disk cap). Install diodes D5 and D6 (1N4148). Observe the installation polarity as shown on the silkscreen. Install electrolytic cap C20 (3.3 uF). Observe the installation polarity as shown on the silkscreen. Small Wonder Labs™ PSK-20 Transceiver Kit 03/09/10 ©2000...
  • Page 14 The wire leads may then be re-bent a few mm away from the capacitor body to re-form them at the correct parallel spacing. Small Wonder Labs™ PSK-20 Transceiver Kit 03/09/10 ©2000...
  • Page 15 Install R9 and R11 (680Ω, blue/gry/brown). Install C102 and C103 (.01 uF disk cap). Install choke, (brn/ black/black) Install R5 (1K, brn/black/red). Install R6 (470Ω, yellow/violet/brown). Install R7 (10Ω, brn/black/black). Install R8 (100Ω, brn/black/brown) Small Wonder Labs™ PSK-20 Transceiver Kit 03/09/10 ©2000...
  • Page 16 Install Mixer U1 (MCL TUF-1 or TFM-2) , from antistatic bag). Be sure that the part labeling is oriented as shown on the figure on this page and that the part correctly overlaps the silkscreened outline on the board. Small Wonder Labs™ PSK-20 Transceiver Kit 03/09/10 ©2000...
  • Page 17 Install Mixer U6 (MCL TUF-1 or TFM-2), from antistatic bag). Be sure that the part labeling is oriented as shown on the figure on this page and that the part correctly overlaps the silkscreened outline on the board. Small Wonder Labs™ PSK-20 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-20 Transceiver Kit 03/09/10 ©2000...
  • Page 19 Note its placement carefully with respect to nearby silkscreened component outlines before installing and soldering. Install R51 and R52 (10Ω, brown/blk/black). Install C118 and C119 (.1 uF monolithic cap, '104') Small Wonder Labs™ PSK-20 Transceiver Kit 03/09/10 ©2000...
  • Page 20 Install C40 and C43 (150 pF monolithic caps , Wrap this wire-pair snugly around the toroid '151J'). for one complete turn. It should look like this: Install C41 and C42 (330 pF monolithic caps , '331J'). Small Wonder Labs™ PSK-20 Transceiver Kit 03/09/10 ©2000...
  • Page 21 PC board. The result is a much cleaner nylon nut. Make sure that the heat sink is appearance once you've completed this step. aligned parallel with the board before tightening the nut. Tighten cautiously- the Small Wonder Labs™ PSK-20 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-20 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

    Connect your computer speaker cable Alignment Instructions to the PSK-20's J2 connector. J2 and J3 are in parallel and permit use of the soundcard If you have not already done so, install all for other applications without repeated DIP ICs in their respective sockets. It may be plugging and unplugging of cables.
  • Page 24 DC voltage reading of 5 to 8 volts at TP2. Transmitter Alignment: Readjust inductor L8s and L9 - in that order- Remove DC power from the PSK-20 for maximum indication. Connect the serial port cable (see 'Hooking Up')

  • Page 25: Troubleshooting The Psk-20

    An Adobe Acrobat reader (free download) is required unfortunately it's true. Ensure that DC power is getting to view these .pdf files. If this isn't convenient for you, to the PSK-20. A board with no voltage anywhere contact me for hardcopy. probably isn't getting power.
  • Page 26 Set check marks in the three volume controls shown - Think "leaving the rig powered" and "music CDs"! above. Note: You may select more than three, depending on what other applications you use the Small Wonder Labs™ PSK-20 Transceiver Kit 03/09/10 ©2000...

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