Ramsey Electronics HR40 Manual de Instruções descarregar pdf (Página 30)

FHT-1 • 30

poor regulation, AC ripple content and RFI susceptibility. If your supply voltage

is in the 11-12 volt range, you can expect a 600 to 800 ma current flow and

about 4 watts of the RF output power. With a solid 13 to 14 volt supply, you

can expect about 1 amp current draw and up to 5 or 6 watts of RF output

power.

IMPORTANT NOTE: If you are experimenting with this transmitter and see a

sudden and massive increase in power output and DC current, you have not

reached the promised land or created a 25 watt transmitter! Sudden surges

like that are a sure sign of amplifier self-oscillation. Kill the DC power supply

immediately, because your Q6 RF power transistor is heading to self-

destruction while probably interfering with every TV set in the neighborhood! A

poorly matched antenna along with higher supply voltages is usually

responsible for this occurring. Any prolonged "parasitic" emissions may also

overheat and destroy other components in the amplifier stages.

INSTALLATION AND PROGRAMMING OF THE MICROCONTROLLER

The following instructions are for programming the Ramsey FHT-1

Fox Hunt Transmitter. If you intend only to use a CW ID then these directions

will be all that are necessary for complete operation. When using the unit in

CW ID modes it is strongly recommended that a battery backup power supply

be added to the microcontroller. This is due to the fact that if for any reason

power is interrupted during or after programming, all the programmed

information will be lost. This voltage should be between 3 - 5V DC and can be

connected to the circuit board as shown in the parts layout diagram. The IC

draws negligible current, so 3 standard “AA” or “AAA” cells connected in series

or a surplus 3.9V lithium will work quite well. Under NO circumstances should

more than 5V DC be applied to the microcontroller.

NOTE: If you have the optional voice ID kit you’ll still need to complete the

testing instructions for CW use, but battery backup is not required.

 1. Install the 16 pin microcontroller IC labeled FHT into the U2 socket.

Notice that the IC is marked with a notch, band or dot denoting pin one of

the device. Be sure to orient this component as shown in the parts layout

diagram. Be careful not to bend any of the pins underneath the body of the

component while inserting. Also,check to make sure that the IC is pushed

snug into the IC socket.

 2. Now connect your keyer paddles or keying device to the three holes at

J3 marked (surprisingly enough) “paddles”. See the diagram for correct

placement.

Before you use the FHT-1 you must first program the CW ID.

Failure to properly identify a transmission is against the FCC rules.

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Ramsey Electronics HR40 Manual de Instruções Página 30