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Thanks! For purchasing one of the Small Wonder Labs "SW-30+" transceiver kits. This kit is an updated version
of the classic '40-40' transceiver board which originally appeared in the November 1994 issue of QST.
Please take a few moments to look over the section entitled "First Things First". This is background information
in case you're fairly new to homebrewing or kit-building.
Please
- Be sure to read through the "Building Instructions" portion of this manual before you fire that
soldering iron up! That section contains useful information which is important to your success with this kit.
D. Benson, K1SWL
Instruction Manual
The "Small Wonder - 30+"
30 Meter Superhet Transceiver Kit
TABLE OF CONTENTS
First Things First ...........................................
Materials........................................................
Parts List........................................................ 4-5
Theory of Operation ......................................
Schematic ......................................................
Pictorial Drawing ..........................................
Building Instructions ..................................... 9-11
Alignment...................................................... 14
Troubleshooting Values ................................ 17
Small Wonder Labs
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4
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2/9/2007
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Summary of Contents for Small Wonder Labs SW-30+
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Page 1: Table Of Contents
The “Small Wonder - 30+” 30 Meter Superhet Transceiver Kit Thanks! For purchasing one of the Small Wonder Labs “SW-30+” transceiver kits. This kit is an updated version of the classic ‘40-40’ transceiver board which originally appeared in the November 1994 issue of QST. -
Page 2: First Things First
You should be familiar with the standard color- RINT code markings on resistors. If not, Radio There are lots of small parts in this kit. With many of us Shack’s Color-Code Guide, #271-1210, will getting older, this may prove troublesome. I highly help. - Page 3 Use a dissecting needle, dental probe (explorer), or even a large sewing needle, applying heat to the needle and board trace simultaneously until the tool pushes through. D .Benson, K1SWL Small Wonder Labs 2/9/2007...
- Page 4 100 pF NPO mono. cap epoxy, ‘101J’ C7F, 8 120 pF NPO mono. cap epoxy, ‘121J’ 150 pF NPO mono. cap epoxy, ‘151J’ C18, 22, 23, 31 150 pF cer. Disk ‘151J’ 220 pF cer. Disk ‘221J’ D .Benson, K1SWL Small Wonder Labs 2/9/2007...
- Page 5 78L08 voltage regulator plastic-cased (TO-92) U1, 3, 5 SA602AN or SA612AN 8-pin IC NE5532 8-pin IC jumper, install at ‘C16’ Make from resistor lead Y1-5 7.68 MHz HC-18/U Xtal, 20pF (may be house # marked) D .Benson, K1SWL Small Wonder Labs 2/9/2007...
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Page 6: Theory Of Operation
U4B, the audio style TO-220 heat sink (Digikey #HS-105 or #HS-106). final stage. This stage is configured as a bandpass filter centered at 800 Hz. The high gain of the two AF D .Benson, K1SWL Small Wonder Labs 2/9/2007... - Page 7 [ IMAGE SCANNED FROM ORIGINAL DOCUMENT D. Benson, K1SWL Small Wonder Labs 2/9/2007...
- Page 8 [ SCANNED FROM ORIGINAL DOCUMENT ] D. Benson, K1SWL Small Wonder Labs 2/9/2007...
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Page 9: Pictorial Drawing
It’s helpful to work from one end or corner of the board to the other. This minimizes the “tight squeeze” cases where the last part in a cluster has to drop into a tight space. D. Benson, K1SWL Small Wonder Labs 2/9/2007... - Page 10 (When these components have been installed, the receiver within selected as a group. They are interchangeable portion of the transceiver is complete.) this group. Do not, however, substitute replacement parts – contact me for assistance. D. Benson, K1SWL Small Wonder Labs 2/9/2007...
- Page 11 (2SC2166) is installed with the metal tab to below: the rear (or ‘top’ when viewed from directly overhead). When viewing the board from the front edge (U1, U3, and U4 nearest you), Q6’s labeling must be visible. D. Benson, K1SWL Small Wonder Labs 2/9/2007...
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Page 12: Wiring The "Sw-30
PC board into an enclosure, grab some cotton swabs and use acetone (nail polish remover) to remove solder flux from the foil-side of the PC board. The result is a much cleaner appearance once you’ve completed this step. D. Benson, K1SWL Small Wonder Labs 2/9/2007... - Page 13 PC board from the as well. Call (800) 231-8842 for a free brochure. enclosure by 3/16” or more. (#4 hex nuts are an acceptable substitute for spacers.) D. Benson, K1SWL Small Wonder Labs 2/9/2007...
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Page 14: Alignment
∆f (KHz) = 1.0 × [C7] (in pF) ∆ where f is the desired frequency shift It’s possible to adjust the operating frequency as much as 15-20KHz downward by squeezing L1’s turns more closely together. D. Benson, K1SWL Small Wonder Labs 2/9/2007... -
Page 15: Troubleshooting The "Sw-30
The 1/8” (3.5mm) jacks in particular are Using a DVM, check the circuit points noted on the trouble-prone. drawing against your SW-30+ to confirm that the DC voltage readings are all in order. D. Benson, K1SWL Small Wonder Labs 2/9/2007... - Page 16 If not, and Vr (the 8V supply) is OK, the NE5532 op amp (U4) is suspect. Touching an antenna wire to the 470Ω resistor to the left of U3 (product detector) should cause shortwave “crud” audible headphones D. Benson, K1SWL Small Wonder Labs 2/9/2007...
- Page 17 D. Benson, K1SWL Small Wonder Labs 2/9/2007...
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