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First, familiarize yourself with the parts and check for all the components. If a part is missing, please contact us
at
qrpguys.parts@gmail.com
Please read all the instructions before starting to assemble the transceiver.
PARTS LIST
LOCATION
C1, C2, C10, C16
C3, C6
C4, C5, C7, C8, C9, C11, C13,
C14, C15, C18, C21, C22
C12, C17, C20
C19
D1
D2, D3, D4
D5
D6
J1
J2
QRPGuys Digital DSB Transceiver Kit
and we will send you one.
QUANTITY
VALUE
4
10 nF - 103
2
100 uF /16V
12
100 nF - 104
3
1 uF / 25V
1
1 nF - 102
1
1N5817
3
1N4148
1
LED Green
1
LED Red
1
BNC Jack
1
2.1mm DC Jack
Page 1 of 13
TYPE
X7R MMLC
Long lead plus
X7R MMLC
Long lead plus
BLACK PLASTIC
SMALL GLASS
May have clear lens
May have clear lens
PCB MOUNT
PCB MOUNT
digital_txcvr_assembly_030720.pdf
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Summary of Contents for QRPGuys DSB Digital Transceiver Kit
- Page 1 QRPGuys Digital DSB Transceiver Kit First, familiarize yourself with the parts and check for all the components. If a part is missing, please contact us qrpguys.parts@gmail.com and we will send you one. Please read all the instructions before starting to assemble the transceiver.
- Page 2 J3, J4 3.5mm Phone Jack STEREO, SWITCHED J5, J6 5 Position SIP Jack 0.1” CENTERS 12V DPDT Relay 10 uH choke Brown-black-black-gold or silver Q1, Q2, Q3, Q4, Q5, Q6 BS170 TO-92 MOSFET 2N3904 TO-92 NPN 51 ohms GRN-BRN-BLK-GLD 4.7K YEL-VIO-RED-GLD 1 MEG BRN-BLK-GRN-GLD...
- Page 3 INDUCTORS 2.2 uH Red-red-gold-gold or silver 3.9 uH Orange-white-gold-gold or silver 8.2 uH Gray-red-gold-gold or silver T37-2 Red Core T37-6 Yellow Core CRYSTALS 7.074 MHz HC-49/US 10.136 MHz HC-49/US 14.074 MHz HC-49/US MISCELLANEOUS Band module boards #26 magnet wire #26 magnet wire, different color 3/32”...
- Page 4 Assembly: The first step is to sort the parts into groups of similar types. This will make finding the needed part type and value quicker. Start with the resistors: Caution: Several of the values have very similar color codes and differ only by the zero multiplier color.
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Page 5: Everything Else
Everything else: [ ] U3 – 7809 Bend the leads so that the U3 hole lines up with the board hole. Secure with 4-40 screw and nut. [ ] J5, J6 – 5 pins SIP socket. Make sure these are set square and straight to the board before soldering more then one pin. - Page 6 [ ] T1, T2 – bi-filler wound on T37-43 ferrite core (black). Cut 6” length of each color magnet wire • The two wires can be lightly twisted • together, but this is not necessary Wind 5 turns on the core as shown. •...
- Page 7 Be sure you have read the values correctly. Sort all the capacitors out before you start assembling them onto the modules. They are difficult to remove and correct. [ ] L1 – 8.2 uH – Gray-red-gold-gold, last band can be silver [ ] C26 –...
- Page 8 Winding the toroids [ ] Wind each of the L2 and L3 toroids using 12” of the supplied magnet wire. Use the tables above and wind them in the direction shown in the graphic below and they will align with the pcb holes. When you are certain of the turn count, trim the leads ~1/2”...
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Page 9: Theory Of Operation
Note: While testing for operation, you can temporarily plug some earbuds into J3 MIC (OUT). This is the audio out to your computer or tablet. If the particular band is open, you should hear received signal tones in one of the earbuds. If you are not hearing any signals, determine the cause and correct before continuing. - Page 10 Transmitter: The SA602 requires very little input signal to saturate. Therefore a resistor divider is placed between the audio input from the sound card to the mixer input. This allows you to set the audio output from the sound card to a reasonable level and not overdrive the mixer.
- Page 11 Page 11 of 13 digital_txcvr_assembly_030720.pdf...
- Page 12 Reference: The following are the results for the harmonics measured on a Siglent SVA1015X. Page 12 of 13 digital_txcvr_assembly_030720.pdf...
- Page 13 Typical voltages for troubleshooting IC's Pin 1 8.33 U2/Rx Mosfets and transistors Drain Gate Source Collector Base Emitter Q1/Rx Q7/Rx 0 Q1/Tx 3 to 8 Q7/Tx 8.9 Q2/Rx Q2/Tx 3 to 8 Q3/4/6 ~2.3 Q5/Rx Q5/Tx 3 to 8 Page 13 of 13 digital_txcvr_assembly_030720.pdf...