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EGV-40 CW QRP Transceiver

Page 24

Take care and avoid any shortcircuits between bridges.

Q12 capsule (2SC2078) should be electrically isolated from the heatsink. Use the plastic washer and the
mica sheet provided with the kit. Once the transistor is fitted over the heatsink, check with a multimeter
that there is no continuity between the transistor tab, the screw and the heatsink. Use the insulating
material and an M3 screw and nut. It is also recommended to apply a dab of thermal grease.
You may also drill other hole on the heatsink if that suits better its position on your box.

DO NOT OPERATE the transceiver without a heatsink on Q12

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Содержание EGV-40

Страница 1: ...ory of Miguel Montilla EA3EGV SK Assembly manual Last update Octubre 1st 2013 ea3gcy gmail com For last minute updates and news please got to www qsl net ea3gcy Thanks for buying and building the kit...

Страница 2: ...ECIFICATIONS 4 TIPS FOR FIRST TIME BUILDERS 5 PARTS LIST SORTED BY VALUE QUANTITY 7 INDIVIDUAL PARTS LIST 9 LOCATION MAP 13 ASSEMBLY 14 ADJUSTMENTS AND CHECKS 24 APPENDICES 28 IF YOUR KIT DOES NOT WOR...

Страница 3: ...He loved to build a kit over a weekend and enjoy some placid QSOs made with his new fresh transceiver Of course always with the minimum power required Miguel EA3EGV was the founder member 1 of the EA...

Страница 4: ...or 2 trimmer capacitors 3 potentiometers volume fine tune and attenuator 7 IC s 12 transistors 6 diodes 11 inductors 5 IF transformers 1 variable capacitor tuning and 5 crystals Front panel controls M...

Страница 5: ...older properly you must use the correct type of iron and the right quality of solder Use a small tipped soldering iron which has a bit that is short and almost pointed at end The iron should be about...

Страница 6: ...wn on the diode outline of the board Electrolytic capacitors These must be installed with the correct polarity The positive lead is always the long lead The negative lead is marked by a stripe on the...

Страница 7: ...potentiometer 470 or 500 or 1K 1 10K P3 10K shaft potentiometer 10K 1 500 P4 500 adjustable resistor TX power output adjust 501 or 52Y Capacitor list Qty Value Checked Ref Identified 17 100n C7 C14 C...

Страница 8: ...22uH L4 Axial inductor red red black 1 47uH L7 Axial inductor yellow violet black 2 T37 2 L10 L11 LPF toroids 16t 9 5 mm diam red 1 T68 2 L5 Toroid Tuning inductor 47 48t 17 5 mm diam red 2 FT37 43 T5...

Страница 9: ...ed black IC3 Audio out H 5 R18 1 brown black gold Fine G 3 R19 100K brown black yellow Fine H 1 2 R20 22K red red orange VXO Q7 E 3 R21 22K red red orange VXO Q7 G 4 R22 1K brown black red VXO Q7 F 4...

Страница 10: ...104 or 0 1 Audio AMP F 7 C26 10n 103 or 0 01 Audio AMP F 5 6 C27 10uF 10uF Audio AMP G 5 C28 100n 104 or 0 1 Audio AMP H 5 C29 100n 104 or 0 1 Audio AMP H 4 5 C30 10n 103 0 01 VXO G 3 C31 22p 22 22p...

Страница 11: ...ype Ident Comment Circuit section Located Transistors Q1 BC547 BC547 MUTE B C 9 Q2 BC547 BC547 IF D 8 X X Q3 J310 SMD factory soldered MUTE H 8 X X Q4 J310 SMDfactory soldered MUTE H 9 Q5 BC547 BC547...

Страница 12: ...see text VXO F 1 2 L6 100uH Axial inductor brown black brown VXO G H 3 L7 47uH Axial inductor yellow violet black TX MIX E 1 L8 100uH Axial inductor brown black brown DRIVER D 5 L9 FT37 43 black toroi...

Страница 13: ...EGV 40 CW QRP Transceiver Page 13 LOCATION MAP...

Страница 14: ...t Parts may be sorted by type value and size ohms micro farads etc RECOMENDED ASSEMBLY SEQUENCE Resistors The resistors are installed first Place all resistors from R1 to R36 and the P4 trimmer transm...

Страница 15: ...before you solder the part in place In case of doubt use a multimeter to check the resistor value R2 is an SMD resistor factory installed Axial inductors L1 L2 L3 L4 L6 L7 L8 These components look ju...

Страница 16: ...lectrolytic type capacitors All these have their value printed on the body Go to the parts list identified column When fitting them keep their leads as short as possible C62 C63 y C64 are Styroflex ca...

Страница 17: ...Q12 now TX power amplifier Integrated Circuits The outline on the board for the ICs has a U notch on one end indicating the pin 1 end of the IC There is also a notch on one end of the sockets This end...

Страница 18: ...same resonating frequency in order to obtain the best filter quality The X5 and X6 pair are the VXO crystals The crystal housing should not touch the board place them slightly separated from the board...

Страница 19: ...the wire tightly on the core avoiding loose turns and spread the turns evenly around the core They should be uniformly spread around the circumference of the toroid Leave pigtails of about 10 mm 0 4 R...

Страница 20: ...Leave pigtails of about 10 20 mm 0 70 Now take a resistor leftover of 15 20 mm 1 2 3 4 in to make the 1 turn secondary remember one turn means that the wire goes once through the toroid core Please t...

Страница 21: ...igtails of about 10 mm 0 4 Remove the enamel of the pigtails with a cutter prior to soldering the toroid on the board The nominal value for L9 is 12 6 H Tuning Polyvaricon capacitor for the VXO CV2 CV...

Страница 22: ...to adjust the upper limit with the polyvaricon in its minimum capacity turned all the way clockwise These adjustments will be carried out later on in ADJUSTMENTS AND CHECKS IMPORTANT If you want to wi...

Страница 23: ...nstall the pots P1 RX attenuator P2 volume y P3 fine tuning as shown in the picture You may want to mount P2 and P3 in the front panel out of the board No problem but use short wires P3 the RF attenua...

Страница 24: ...e kit Once the transistor is fitted over the heatsink check with a multimeter that there is no continuity between the transistor tab the screw and the heatsink Use the insulating material and an M3 sc...

Страница 25: ...eader If your counter has a low input impedance insert between the counter and the header a resistor 470 ohm or more or a small capacitance cap try with 22 pF or less to reduce the interaction between...

Страница 26: ...e used for the fine tuning The one below X goes in parallel with CV2 J1 B and the one on top Z is for CV3 J1 A These padders may move the upper limit up to about 10 20 kHz Make this adjustment with th...

Страница 27: ...ffecting its stability L6 should remain well fixed it is very important since vibrations may change the VXO frequency causing tremors on the received and transmitted signals Prior to the L5 final fix...

Страница 28: ...FO REMEMBER All transmission checks should be done with a 50 ohm load connected to the transmitter output DO NOT OPERATE the transceiver without a heatsink on Q12 Adjustment of the TX T3 and T4 bandpa...

Страница 29: ...TO 220 transistor as Q12 Notes Some transistors may have higher gain and depending on their manufacturer may be prone to auto oscillations Many of this kind of HF transistors offered in the market at...

Страница 30: ...ith the Main tuning control move the Fine tuning to tune it spot on Once you have finished the QSO or when you want to search for other stations return first the Fine tuning control to its mid positio...

Страница 31: ...perience on kits or a technician to check your work A fresh look to your circuit may find things you had overlooked In case of need your request for technical assistance by email to ea3gcy gmail com i...

Страница 32: ...7 12 98 4 10 2 40 0 C 0 5 90 D 3 25 D 3 75 0 1 39 7 90 7 90 13 65 13 49 13 65 13 80 E 0 4 09 S 4 81 S 4 82 0 0 4 30 3 93 13 80 3 45 1 80 0 IC1 IC2 IC3 IC4 IC5 IC6 IC7 1 1 39 1 39 1 35 Out 5 96 Out 7 9...

Страница 33: ...ing to all printed instructions It is your responsibility to follow all directions in the instruction manual to identify parts correctly and to use good workmanship and proper tools and instruments in...

Страница 34: ...EGV 40 CW QRP Transceiver Page 34 SCHEMATICS...

Страница 35: ...l stability is important A metal box is highly recommended Take notice that the EGV 40 is NOT PROTECTED against polarity inversions It is a good idea to place a diode ex BY255 or larger in parallel wi...

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