Assembly Manual Both Parts QRP Kits

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Opening the box you will see bags of parts and a PC Board. Photo by KC0WOX,Photo by KC0WOX,Parts Inventory,Quantity Value Device Quantity Value Device. 1 160 pf External tuning cap 1 2 2 Resistors,5 10 uf POLARIZED CAP 1 4 7. 7 100 uf POLARIZED CAP 9 10,1 220 pf POLYSTYRENE 2 22. 2 470 pf POLYSTYRENE 13 100,4 30 pf Trim capacitor 14 220. 1 0 01 uf 3 10K,40 0 1 uf 2 150 K,3 10 pf 15 1K,10 100 pf 11 2 2K.
1 15 pf 1 2 7K,3 180 pf 1 22K,2 220 pf 1 3 3K,3 33 pf 11 4 7K. 1 0 022 uf 5 11 MHz XTAL S,2 56 pf Quantity Value Device. 1 8 2 pf 1 33v ZENER DO35 V,4 82 pf 1 5 6v ZENER DO35 V. 1 9 1v ZENER DO35 V,1 1N4004 Diode,12 1N4148 Diode. Quantity Value Device Quantity Value Device,16 2N3904 Transistor 1 SB320 Diode.
1 2N5486 Transistor 2 HEATSINK,4 2N7000 Transistor 1 RELAY. 2 BS170 MOSFET,1 FQN1N50C MOSFET,1 LM386N 4 AF PA,2 IRF510 MOSFET Quantity Value Device. 2 200 3318 TRIMMER 1 1 2 uH molded choke,3 10K 3318 TRIMMER 1 8 2 uH molded choke. 1 10k Fine tune external pot 8 FT37 43 Toroid Core Black. 1 10K Volume control external 5 T37 6 Toroids Core Yellow. Photo by K7HKL, It is advisable that you inventory your parts to make sure everything is available and ready for. assembly Each builder may have his her own way of organizing parts but if you do not you might try. using a block of Styrofoam packing material as shown in the above picture Parts are sorted by type. and size ohms micro farads etc Toroid cores in this picture are stacked on wooden toothpicks. which were inserted into the Styrofoam,Some Assembly Recommendations.
Before you start assembling your new BITX20A there are a few things you might want to review. 1 Most of the resistors diodes and some axial leaded capacitors in this kit are installed on end. To make your kit look more professional it is advisable to bend the longer lead of these. components over a scrap of PCB material so that all your exposed lead bends look. approximately the same, 2 You will be twisting enamel coated wires together to make the windings for toroid transformers. To do this you can use the drill and bent nail method or fabricate a manual twisting device from. stiff wire and a tubular insulator, 3 Be especially observant of component orientation stenciled on the PCB Polarized components. must be installed correctly In some cases the exposed lead is specifically selected to provide. test equipment access for tune up and troubleshooting. Kit Assembly, Receive Transmit Power Changeover Relay and Power Input Components. Illustration 1 D 17 and D 18 Installation N7VE Photo. D 17 1N4004 Observe Polarity, K1 351 Relay Hold the relay body flat to the PCB while soldering. Connect push to talk part of microphone connector or a temporary momentary switch as PTT. Note Pads for the push to talk connection are provided along one edge of the board and. are marked as PTT with the ground pad also marked with Gnd Or if you do. not want to connect your microphone jack yet you can just solder a small. momentary switch across these pads for testing purposes during alignment. Caution The changeover relay applies ground to the receive section power feeds during. transmit mode and ground to transmit power feeds during receive mode This. means that you cannot jumper 12 volts to the transmit sections while in receive. mode and cannot jumper 12 volts to the receive sections when in transmit. mode without shorting something and possibly damaging your PCB or. components,D 18 SB320 Observe Polarity,C 87 0 1 mfd marked 104.
C 74 100 mfd Observe Polarity,Clip Excess Lead Length. Inspect Solder Connections, TEST At this time you can apply 12 volts and test the relay by shorting the PTT pads and monitor. Receive and Transmit voltages to see that power is being transferred properly. Illustration 2 Receive Audio Pre Amplifier N7VE Photo. Illustration 3 Receive Audio LM 386 Power Amplifier. N7VE Photo,Receiver AF Amplifier,C 36 100 mfd Observe Polarity. C 83 0 1 mfd marked 104,R 81 10 ohms brown black black. C 82 10 mfd Observe Polarity, IC 1 LM386 Make sure you get this positioned properly when you insert it.
Clip Excess Lead Length,Inspect Solder Connections. C86 100 mfd Observe Polarity,R 82 10 ohms brown black black. R 79 220 ohms red red brown, R 80 10K ohm potentiometer NOTE Off board component Use 6 inch leads. Ground lead near C 82 Hot lead near Q 16,C 81 10 mfd Observe Polarity. C 80 100 mfd Observe Polarity,R 78 4 7K ohms yellow violet red.
Clip Excess Lead Length,Inspect Solder Connections. Q 16 2N3904 Position as stenciled on the PCB,Q 25 2N3904 Position as stenciled on the PCB. R 88 4 7K ohms yellow violet red,R 89 22K ohms red red orange. C 47 0 pf This is an artifact from an older PCB design Do not install any capacitor here. C 79 0 022 mfd marked 22K,R 77 3 3K ohms orange orange red. C 8 10 mfd Observe Polarity, Speaker or Headphone Jack Connection Use 6 inch leads.
Ground is the pad near C 75,Clip Excess Lead Length. Inspect Solder Connections, TEST At this point you can test your receiver audio amplifier by connecting a speaker applying 12. volts to the power input pads Insert a tone at the negative side of C8 and adjust the volume control for. a comfortable listening level, Illustration 4 Transmitter AF Amplifier N7VE Photo. Transmitter AF Amplifier Microphone Amplifier,R 76 10 ohms brown black black. R 92 4 7K ohms yellow violet red, NOTE This is power for FET mike Omit for dynamic or crystal mike.
C 60 10 mfd Observe Polarity,C 76 0 01 mfd marked 103. R 73 2 7K ohms red violet red,R 72 10K ohms brown black orange. R 75 1K ohms brown black red,Clip Excess Lead Length. Inspect Solder Connections, Q 15 2N3904 position matching that stenciled on PCB. R 74 100 ohms brown black brown,C 73 100 mfd Observe Polarity.
R 93 220 ohms red red brown,C 77 10 mfd Observe Polarity. C 75 100 mfd Observe Polarity,Clip Excess Lead Length. Inspect Solder Connections, TEST You can test the microphone amplifier by using an audio amplifier to monitor the negative side. of C 77 while you key your microphone and talk into it. Illustration 5 BFO Mixer Section N7VE Photo,BFO Mixer Assembly. T 6 8 8 8 turns 28 trifilar on FT37 43 black core This is three wires each 6 inches long. Twist them together for 8 twists per inch,and wind this on the core.
C 66 15 pf marked 15, C 65 30 pf variable capacitor Note Flat side is RF side round side is ground. If you get this installed backwards it will detune the. circuit when you put a metallic screwdriver in it to make. adjustments,R 66 200 pf PCB type potentiometer,R 65 220 ohms red red brown. R 63 22 ohms red red black,R 64 220 ohms red red brown. NOTE Pay particular attention to the location and values of R 63 R 64 and R 65. If you get these in the wrong places your receiver sensitivity and transmitter. power output may be degraded Swapping the 22 ohm resistor with one of. the 220 ohm resistors is a common mistake in early BITX20 units and. possibly in BITX20A kits,Clip Excess Lead Length,Inspect Solder Connections. Illustration 6 BFO Carrier Oscillator Section N7VE Photo. BFO Carrier Oscillator, C 88 33 pf NOTE May not be needed but provided to insure adequate tuning range.
C 72 30 pf variable capacitor Note flat side is RF side round side is ground. L 5 8 2 uh molded inductor looks like a fat resistor with gray red gold gold bands. X 5 11 0 MHz Crystal Add ground wire soldered to crystal case. C 68 220 pf marked 221,C 69 220 pf marked 221,R 70 150K ohms marked brown green yellow. Clip Excess Lead Length,Inspect Solder Connections. Q 14 2N3904 Position according to layout stenciled on PCB. R 71 1K ohms brown black red,C 70 100 mfd Observe Polarity. R 69 100 ohms brown black brown,R 68 1K ohms brown black brown. Q 13 2N3904 Position according to layout stenciled on PCB. Clip Excess Lead Length,Inspect Solder Connections.
C 67 0 1 mfd marked 104,C 71 0 1 mfd marked 104,R 67 1K ohms brown black red. D 14 1N4148 Observe Polarity,D 15 1N4148 Observe Polarity. Clip Excess Lead Length,Inspect Solder Connections. TEST Insert an 11 0 MHz signal across R 64 and listen for a beat note from the receive audio. Illustration 7 Second IF Amp Section N7VE Photo,Receive 2nd IF Amp and Transmit 1st IF Amp. C 64 0 1 mfd marked 104,R 58 1K ohms brown black red.
R 57 2 2K ohms red red red, Q 12 2N3904 Position according to marking stenciled on PCB. R 60 4 7 ohms yellow violet black,C 61 0 1 mfd marked 104. R 59 470 ohms yellow violet brown,Clip Excess Lead Length. Inspect Solder Connections,D 13 1N4148 Observe Polarity. R 61 220 ohms red red brown,C 63 0 1 mfd marked 104.
R 62 100 ohms brown black brown,R 56 100 ohms brown black brown. C 57 0 1 mfd marked 104,D 12 1N4148 Observe Polarity. Q 17 2N3904 Position according to layout stenciled on PCB. Clip Excess Lead Length,Inspect Solder Connections. C 58 0 1 mfd marked 104,R 53 470 ohms yellow violet brown. R 55 4 7K ohms yellow violet red,R 52 1K ohms brown black red.
Q 11 2N3904 Position according to markings stenciled on PCB. Clip Excess Lead Length,Inspect Solder Connections. R 54 4 7K ohms yellow violet red,C 59 0 1 mfd marked 104. R 51 220 ohms red red brown,C 89 100 pf marked 101. C 62 100 pf marked 101,Clip Excess Lead Length,Inspect Solder Connections. TEST Insert an 11 0 MHz signal at the junction of C 62 and C 89 and listen for a beat note from the. Hendricks QRP Kits BITX20A Assembly Manual 6 February 2008 The BITX20 idea originated with a transceiver designed by Ashar Farhan VU3ICQ that was intended to

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