Small Wonder Labs PSK-20 Instructions Manual
  1. Manuals
  2. Brands
  3. Small Wonder Labs Manuals
  4. Transceiver
  5. PSK-20
  6. Instructions manual

Small Wonder Labs PSK-20 Instructions Manual

Board kit
Hide thumbs Also See for PSK-20:
Table of Contents

Advertisement

Quick Links

See also: Instruction Manual
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 ...................................................
Component Identification.................... 4
Parts List ...................................................
Operational Desription ..................................6
Schematics ................................................. 8
Pictorial Drawing...................................
Building instructions , general.........
Grouped assy. Instr....... 12
"Hooking Up" ................................
Alignment ................................................
"Frequently Asked Questions"..................24
PSK-20 Transceiver Kit
2
3
5
10
11
20
21
22
8/31/04
1

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the PSK-20 and is the answer not in the manual?

Questions and answers

Related Manuals for Small Wonder Labs PSK-20

Summary of Contents for Small Wonder Labs PSK-20

  • Page 1: Table Of Contents

    Component Identification……………….. 4 Parts List ........... Operational Desription ........6 Schematics ..........8 Pictorial Drawing........Building instructions , general..Grouped assy. Instr……. 12 "Hooking Up" ........ Alignment ..........Troubleshooting the "PSK-20 " ...."Frequently Asked Questions"………………24 Small Wonder Labs PSK-20 Transceiver Kit 8/31/04...

  • Page 2: First Things First

    • Parts list multimeter before installing them. • Pictorial The PSK-20 board is double-sided and all holes on • grouped assembly text the board are plated-through. This means that you do • not need to solder on the top side of the board.

  • Page 3: Component Identification

    After removing a component from the board, the through-hole will probably still be blocked with solder. Use a dissecting needle or dental probe (explorer), Small Wonder Labs PSK-20 Transceiver Kit 8/31/04...
  • Page 4 '104' and you find the correct number of parts, but marked "104M', for instance, those are them! You'll find the following items with your PSK-20 kit: bag of parts, miscellaneous antistatic bag (contains semiconductors) These caps generally follow the same marking conventions 1- poly bag- SMT inductors, diodes as for the disk caps.

  • Page 5: Parts List

    6.8 ohm " Blue-grey-gld-gld R25, R26,R39 51 ohm " Grn-brn-blk-gld R2,R32 100 ohm " Brn-Blk-brown-gold R30,R34 220 ohm " Red-red-brown-gld R1,R3,R4,R11,R22-R24,49 470 ohm " Ylw-viol-brown-gld 680 ohm " Blue-gry-brown-gld R6, R29,R37,R45,R48 " Brown-blk-red-gld Small Wonder Labs PSK-20 Transceiver Kit 8/31/04...
  • Page 6 This stage has a gain of approximately impedance (1.5K ohms) of mixer U1. 100 (40 dB). U1 is fed with a 5.07 Mhz Local Oscillator (LO) signal and converts the incoming 14.07 Mhz received Small Wonder Labs PSK-20 Transceiver Kit 8/31/04...
  • Page 7 'high' (~12V) to 'low' (~0-2V). This and provides approximately 12 dB of gain. threshold corresponds to a power output slightly above 1W PEP [for a properly-adjusted PSK-20.] Because the output of mixer U7 has energy on a number of frequencies, bandpass filtering is required to The 'low' voltage at U4, pin 7 causes DC current to clean up its spectrum.
  • Page 8 Small Wonder Labs PSK-20 Transceiver Kit 8/31/04...
  • Page 9 Small Wonder Labs PSK-20 Transceiver Kit 8/31/04...
  • Page 10 SA602 1458 Small Wonder Labs PSK-20 Transceiver Kit 8/31/04...

  • Page 11: Schematics

    (0.5 to 1mm) above the printed-circuit board to prevent shorts from case to ground. Banded end Do not omit the mica washer from under the PA Is cathode transistor (Q11)- it's there for a reason! Diode- Schematic Pictorial Small Wonder Labs PSK-20 Transceiver Kit 8/31/04...
  • Page 12 Once both leads are silkscreen and pictorial drawing.. soldered, install the plastic shroud. Note: not to worry- the PSK-20 is reverse-polarity Install resistor R17 (1M, brown-blk-green) protected by D12. Install resistor R19 (22K, red-red-orange) Install resistor R13 (100K, brn-blk-yellow) PWR.
  • Page 13 Install C24 and C119 (.01 uF disk caps). 3.3 uH Install trimmer capacitor C38 (RED). Be sure to orient the 'flat' side of the capacitor body as shown on the pictorial and silkscreen. Small Wonder Labs PSK-20 Transceiver Kit 8/31/04...

  • Page 14: Pictorial Drawing

    U2. Match the installation polarity as shown on the silkscreen and Install resistor R7 (4.7K, ylw/viol/red). pictorial drawing. Install resistor R9 (6.8 ohm, blue/grey/gld). Install .01 uF ('103') disk capacitors at C10, C11,C103,C104 and C105. Small Wonder Labs PSK-20 Transceiver Kit 8/31/04...
  • Page 15 Install 330 pF ('331') monolithic capacitors at Group 5 assembly installs the receiver 'front end'. The C34 and C36. receiver portion of the PSK-20 will be functional upon completion of this group. Install a 150 pF ('151') monolithic cap at C37.
  • Page 16 Install a 47 uF electrolytic capacitor at C18. 1 uF Match the installation polarity as shown on the silkscreen and pictorial drawing. 4401 4401 2N7000 4.7K 47 uF Small Wonder Labs PSK-20 Transceiver Kit 8/31/04...
  • Page 17 Install C32 (150 pF monolithic cap, '151'). 1N4001 Install L5 and L6 (remaining two metal-can tunable inductors) Install R37 (1K, brown/blk/red). Install R36 (3.3K, orange/org/red). Install R35 and R38 (6.8Ω, blue/gry/gold). Install R39 (51Ω, green/brn/black). Small Wonder Labs PSK-20 Transceiver Kit 8/31/04...
  • Page 18 Cut the protruding leads to a length of 1/2", strip these with the wirestripping tool and install at T1. Doublecheck the insulation colors before soldering this component down. Install C33 and C117 (.1 uF monolithic capacitors, '104'). Small Wonder Labs PSK-20 Transceiver Kit 8/31/04...
  • Page 19 Q11's three leads into the corresponding holes in the board. (Do not solder yet.) Secure in place with a steel nut on the underside of Small Wonder Labs PSK-20 Transceiver Kit 8/31/04...

  • Page 20: Hooking Up

    Call [800] 231-8842 for a free brochure. The figure below shows the interconnect between the PSK-20 board and the outside world (more on alignment later) Before the "Smoke Test": The enclosure option for this transceiver is a...

  • Page 21: Alignment

    'LSB'. Connect a 3.5mm (1/8") 3-conductor shielded cable between your computer soundcard Connect a 50-ohm antenna to J4. LINE output and the PSK-20's AF IN jack (J2). Using the supplied tuning tool (white plastic), set inductor L2 to approximately halfway along the slug travel.
  • Page 22 TP1 in the lower right corner of the board. Using the plastic tuning tool, adjust inductor L5 for a maximum meter indication. Adjust the Master Volume control slider to correspond output power Small Wonder Labs PSK-20 Transceiver Kit 8/31/04...

  • Page 23: Troubleshooting The Psk-20

    "PSK-20" doesn't play, here are some general the troubleshooting information. It's located under the troubleshooting guidelines. PSK-20 URL listed on page 2 of this manual "It works better plugged in!" • The figure below illustrates IC pinout. The "pin 1...

  • Page 24: Frequently Asked Questions

    And a final note-: If the signal is badly smeared by propagation - Remove DC power from the PSK-20 when it's not in conditions, the phase information may be lost - use. You're probably using your soundcard for other PSK31 is susceptible to polar (auroral) flutter.

Table of Contents