EA3GCY EGV-40 Assembly Manual Download Page 33

EGV-40 CW QRP Transceiver

Page 33

Limited WARRANTY

Please read carefully BEFORE building your kit

All parts and hardware supplied with the kit are under warranty in case of manufacturing defect for the
period of one year after sale. The warranty does not include the transmitter power amplifier transistor.

The original purchaser has the option of examining the kit and manual for 10 days. If, within this period,
the  buyer  decides  not  to  build    the  kit,  he  or  she  may  return  the  entire  unassembled  kit  at  their  own
expense Shipping charges included on the kit price and sale commissions  (by banks or “Paypal”, etc)
won't be returned..
Please, BEFORE making a return, ask for directions by email to: ea3gcy@gmail.

Javier Solans, ea3gcy, warrants this device to function as described in this documentation provided that
it is assembled and used correctly according 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 constructing and adjusting this kit.
REMEMBER: This kit will not work as a commercially manufactured set, however, can often give similar
results. Do not expect great performance, but it is sure that you will have a lot of fun!

If you notice a missing kit part missing, please do first a thorough inventory. Check all bags, envelopes
or boxes carefully. If need be, email me and I will promptly replace any missing part. Even in the case
that you find the exact replacement locally, please let us know so we are aware of the problem and get
ready to help other customers.
I can also supply any part that you have lost or break accidentally.
If  you  find  any  errors  in  this  manual  or  would  like  to  make  a  comment,  please  do  not  hesitate  in
contacting me at:

[email protected]

THANKS for building the EGV-40 CW transceiver kit.
Enjoy QRP!
73 Javier Solans, ea3gcy

Summary of Contents for EGV-40

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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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