Vectronics VEC-1220K Скачать руководство пользователя | Manualshive

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When shipping, pack your kit well and include the minimum payment plus shipping and
handling charges ($25.00 total). No work can be performed without pre-payment. Also,
provide a valid UPS return address and a day time phone number where you may be reached.

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Содержание VEC-1220K

Страница 1: ...ific part is no longer available or if Engineering has determined that an alternative component is more suitable Vectronics reserves the right to make substitutions at any time In most cases these cha...

Страница 2: ...it well and include the minimum payment plus shipping and handling charges 25 00 total No work can be performed without pre payment Also provide a valid UPS return address and a day time phone number...

Страница 3: ...h the push of a switch Best of all there s no need to order crystals to get started each kit already includes one cut for the internationally recognized QRP calling frequency on that band Finally when...

Страница 4: ...they may act very differently in an electronic circuit Same for capacitors a device marked 102 or 001 uF may have very different operating characteristics from one marked 103 or 01uF 2 Installing Par...

Страница 5: ...t with a pair of hemostats or needle nose pliers Heat the pad beneath the lead you intend to extract and pull gently The lead should come out Repeat for the other lead Solder may fill in behind the le...

Страница 6: ...d it especially helpful to arrange resistors in ascending order along a strip of double sided tape Some VEC kits may contain molded chokes which appear at first glance similar to resistors in both sha...

Страница 7: ...nsistors in metal cases have a small tab near the emitter lead to identify correct positioning Semiconductors housed in small plastic cases TO 92 have an easily identified flat side to identify mounti...

Страница 8: ...basis of the information given set it aside until all other items are checked off You may then be able to identify it by process of elimination Finally your kit will go together more smoothly if part...

Страница 9: ...1 2N3904 transistor Q2 1 PN2222 transistor Q3 1 2N3053 transistor Q4 2 1N4007 diode D1 D2 1 1N4148 diode D3 Jacks Switches Qty Part Description Designation 1 3 5mm key jack J1 1 2 1mm coaxial power ja...

Страница 10: ...n 1 14 060 MHz crystal Y1 VEC 1230K 30 Meter QRP CW Transmitter Kit Capacitors Qty Part Description Designation 1 33 pF multilayer C6 1 47 pF multilayer C8 1 100 pF multilayer C16 1 220 pF multilayer...

Страница 11: ...layer C13 C16 2 820 pF multilayer C19 C20 2 1000 pF multilayer C7 C14 Inductors Chokes Qty Part Description Designation 3 10 uH brown black black silver RFC1 RFC2 RFC3 1 12 length of 24 enameled wire...

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Страница 13: ...each lead over to hold it in place Use sharp side cutters to clip off excess lead length before soldering Make sure trimmed leads don t touch other pads and tracks or a short circuit may result Good N...

Страница 14: ...11 disc ceramic capacitors Note that all but one has a value of 01 uF Phase 2 Ceramic and Electrolytic Capacitors Locate ten 10 01 uF disc ceramic capacitors marked 103 1 Install a 01 uF disc ceramic...

Страница 15: ...ding the transmitter circuitry Each should be pre formed prior to installation as shown below An approximate distance between mounting holes is given to help you pre form each one When installed each...

Страница 16: ...t Q4 inserting leads all the way so the metal case rests on the surface of the PC board The metal emitter tab should point toward R7 Solder Locate two 2 1N4007 diodes Note the white band at one end of...

Страница 17: ...Multilayers have superior radio frequency operating characteristics but the lead welds may fail if the leads are placed under stress while being heated during installation or removal For this reason...

Страница 18: ...47 or 470 Install at C8 and solder 3 Find a 68 pF multilayer cap 68 or 680 Install at C16 and solder Find three 3 220 pF multilayer caps marked 221 4 Install a 220 pF multilayer at C7 and solder 5 Ins...

Страница 19: ...ll 330 pF at C20 and solder 7 Find a 470 pF multilayer cap 471 Install at C13 and solder 8 Find the remaining 680 pF multilayer cap 681 Install at C14 and solder Locate three 3 2 2 uH molded chokes re...

Страница 20: ...hree 3 4 7 uH molded chokes yellow violet gold gold or silver 9 Install a 4 7 uH choke at RFC1 10 Install a 4 7 uH choke at RFC2 11 Install a 4 7 uH choke at RFC3 Locate the T37 2 toroid form a donut...

Страница 21: ...10 uH choke at RFC3 and solder Locate the T37 2 toroid form a donut shaped part about 3 8 in diameter and color coded red Also find the 24 enameled coil wire provided with your kit 12 Wind twenty two...

Страница 22: ...of the PC board Twist each solder tab slightly to secure the jack place and solder all three Find the plastic encased variable capacitor This is the transmitter s VXO tuning control C5 Locate the smal...

Страница 23: ...d break When you come back be prepared to give your work a thorough QC quality control check before moving on to the Testing and Alignment section PC Board Inspection Before applying power to your kit...

Страница 24: ...o your RF wattmeter or VSWR bridge 100 ohm 100 ohm PL259 2 Power Meter In addition to a dummy load you ll need a calibrated RF power meter with a low power range to measure the output of your transmit...

Страница 25: ...e by a crowbar diode D1 However activation will blow a trace fuse etched onto the circuit board next to the power connector This must be replaced by a thin wire or a pig tail type fuse before your kit...

Страница 26: ...ver during the initial test However your station receiver should be turned on placed in the CW mode and tuned in to the transmitter s approximate frequency If any of the steps outlined below fail refe...

Страница 27: ...and tune the VXO capacitor The transmit frequency should shift The amount of frequency shift you obtain will depend upon the band of operation On 20 meters a tuning range of 7 kHz or more is possible...

Страница 28: ...EC QRP CW Transmitter s receiver jack without risk of damage Transmitter output is typically around 32 dBm and the energy reaching your receiver through the T R switch is normally 25 dB lower or about...

Страница 29: ...also provided for adding a very low cost choke balun to your installation A balun helps eliminate unwanted feedline radiation on transmit and noise pick up on receive Heavy weight or premium cables a...

Страница 30: ...ter signal with a receiver to see if Q2 is working Weak Signal no measurable output Check for construction errors around Q3 Q4 Also check position of diodes D2 and D3 Vcc should be present on case of...

Страница 31: ...iagram to trace out the exact cause of the problem E B C E B C Collector is on Case Emitter is grounded 2N3053 Top View 2N3906 Q1 2N3904 Q2 PN2222 Q3 Front View Q1 Q2 Q3 Q4 E B C E B C Standby Key Dow...

Страница 32: ...PA Q4 through capacitive divider C13 C14 Q4 is a simple class C amplifier that remains powered at all times but only draws current when RF excitation is present In transmit mode the antenna line is ro...

Страница 33: ......

Страница 34: ...de g Repeat this procedure for the front panel 2 Next install the two L brackets on the chassis using two of the 3 16 screws The longer side of the L bracket must be connected to the chassis using the...

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