Vectronics VEC-204 - Manual (Page 2)

VEC-204 Instruction Manual Electronic Keyer
2
7. The Tone control sets the desired sidetone pitch from approximately 200 to
1000 Hz. This control is also accessed through a small hole on the rear of
the unit and may be adjusted using a small flat-headed screwdriver. This
control is turned clockwise to raise the pitch and counter-clockwise to lower
the pitch.
8. The
Key Output circuit supports both positive and negative keyed radios.
The VEC-204 can only key one type of transmitter at a time. This is an
internal jumper selected option. The unit is factory set to direct keying
(most solid state radios). To change to grid-block keying (most radios with
tube finals) the power must be off, then remove the paddle to access the
jumpers inside the case. Locate jumpers JMP1 and JMP2. JMP2 is directly
behind the RCA jack. JMP1 is approximately one inch behind the RCA
jack. Set both jumpers JMP1 and JMP2 to the "G" position. To key a solid
state transmitter, set both jumpers to the "D" position.
Note: Power must be off when changing the jumper settings.
9. The Iambic Type A/B mode is also set inside the unit with a jumper. The
unit is factory set for Type "A" Iambic. If you prefer Type "B" Iambic,
remove the paddle to access the jumper. Locate jumper JMP3 near the
Speed control and set it to the "B" position. For Type "A" Iambic, set the
jumper to the "A" position.
Note: Power must be off when changing the jumper settings.
When a squeeze is released during an element (dot or dash), type "B" adds
the opposite element. Type "A" just finishes the element in progress and
does not produce a following alternate element. For example, in Type "A"
Iambic, a squeeze release during the "dah" in the letter A will produce "dit
dah" (A). In Type "B" Iambic, a squeeze release during the "dah" in the
letter A will produce "dit dah dit" (R).
Connections
1. A nine volt battery (not included) may be installed. Remove the case by
removing the screws on the bottom that secure it to the paddle. A battery
clip, located inside the case, is provided for installing a nine volt battery.
2. A 12 Vdc power supply may also be used to power the VEC-204. A 2.1mm
coaxial plug with a positive center and a negative sleeve should be used to
power this unit. The battery is automatically disconnected when external
power is used.