The VEC-254 is the finest keyed oscillator on the market. Its professional quality is well suited for demanding classroom use and abuse. The VEC-254's unique design removes any harsh key clicks. Making the VEC-254 a perfect complement to any keyer paddle. This unit enhances classroom instruction of Morse Code by delivering a full watt of power to the internal 3 inch speaker.
Key clicks can be especially annoying in high output units where they tend to bounce around the room. The VEC-254 produces a true pure sinewave so you'll hear the clearest sounding tone you have ever heard from a code practice oscillator. You'll get low distortion CW--typically less than .2% total harmonic
distortion from its BTL (Bridge-Tied-Load) amplifier.
FRONT PANEL:
Power (On/Off)................................Power Switch
Volume............................................Volume Control
Tone ................................................Tone Control
Pwr ..................................................Power Indicator
Key Input.........................................1/4" Phone Jack
REAR PANEL
Power...............................................2.1mm Coaxial Jack
Ext. Speaker ....................................3.5mm Speaker Jack
OPERATION:
The VEC-254 requires a 12V source for power operation. The power jack accepts a 2.1mm coaxial type plug with the outside sleeve as the ground pole and the inside as the positive pole. Apply power to the unit by plugging a power adapter to the jack on the back of the unit labeled "Power". With the switch in the Off position (out), connect a keyer paddle to the "Key Input" of the VEC-254. The Key Input requires a 1/4" mono or stereo plug with a 2-conductor wire from the keyer. The sleeve is connected to ground and the other wire is connected to the tip. Once the power and keyer have been attached, the VEC-254 is ready to use. Push in the power switch to the On position and verify that the indicator labeled "Pwr" is lit.
WARNING: Do Not Place The Output Speaker Of This Unit In Close Proximity To Your Ears. The
Amplification On This Unit Is Very High And Could Cause Damage.
The volume control for the VEC-254 is located on the front of the unit. To increase the output volume, push in the power switch to the On position, key the keyer and turn the knob labeled "Volume" in the clockwise direction. The tone control is also located on the front of the unit. With the volume at a comfortable level and the keyer keyed, adjust the tone by varying the knob labeled "Tone".
To use the VEC-254 with the optional external speaker, plug a speaker, with a 3.5mm plug, into the jack labeled "Ext. Speaker". This jack is located on the back of the unit.
The VEC-254 comes with a trimpot to generate a symmetrical rise time and fall time of the input signal. This feature eliminates the unwanted key clicks that are normally heard from keyers. The setting on this trimpot (R20) is made at the factory and should not be changed.
TECHNICAL ASSISTANCE
If you have any problem with this unit first check the appropriate section of this manual. If the manual does not reference your problem or your problem is not solved by reading the manual you may call VECTRONICS at 601-323-5800.You will be best helped if you have your unit, manual and all information on your station handy so you can answer any questions the technicians may ask.You can also send questions by mail to VECTRONICS, 1007 HWY 25 South,Starkville, MS 39759 or by Fax to 601-323-6551. Send a complete description
of your problem, an explanation of exactly how you are using your unit, and a complete description of your station.
| P/N | | | DESCRIPTION | REFERENCE |
| 100S-2100 | 100Ω | | RESISTOR | R17 |
| 100S-3100 | 1KΩ | RESISTOR | R4,R11,R14 | |
| 100S-3390 | 3.9KΩ | RESISTOR | R7 | |
| 100S-3470 | 4.7KΩ | RESISTOR | R2,R13 | |
| 100S-4100 | 10KΩ | | RESISTOR | R1,R6,R8,R12,R16 |
| 100S-4270 | 27KΩ | | RESISTOR | R5 |
| 100S-4470 | 47KΩ | | RESISTOR | R9,R10 |
| 100S-5150 | 150KΩ | RESISTOR | R3 | |
| 100S-5330 | 330KΩ | RESISTOR | R15 | |
| 130-5100 | 100KΩ | TRIMPOT | R20 | |
| 155-3100-1 | 1KΩ | POT | R22 | |
| 155-4100-1 | 10KΩ | | POT | R21 |
| 200S-1110 | .01 ﾵ | F CAPACITOR | C6 | |
| 200S-1122 | .022 ﾵ | F CAPACITOR | C2,C3 | |
| 200S-1210 | .1 ﾵ F CAPACITOR | C4,C5 | ||
| 203-1470 | 470 ﾵ | F, ELECTROLYTIC CAPACITOR | C7,C8 | |
| 203S-3110 | 1 ﾵ F CAPACITOR ELECT | C1 | ||
| 300S-0914 | 1N4148 SWITCHING DIODE | D1,D2,D3,D4 | ||
| 305-7002-SM | 2N7002 TRANSISTOR | Q1 | ||
| 307-1020 | +8V VOLTAGE REGULAR | U2 | ||
| 311-0040-SM | LM324 OP AMP | U1 | ||
| 311-27052 | TDA7052AN AUDIO AMP | U3 | ||
| 320-1002 | 3mm RED LED | CR1 | ||
| 410-0169 | 3" 8Ω | | SPEAKER | SPK1 |
| 504-0022 | 2P2T PUSH BUTTON SWITCH | SW1 | ||
| 601-0012 | 1/4" PHONE JACK | J3 | ||
| 601-5005 | 3.5mm CLOSED STEREO JACK | J2 | ||
| 601-6021 | 2.1mm COAXIAL, POWER JACK | J1 | ||
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