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Tech808
Moderator
Username: Tech808
Post Number: 15832
Registered: 8-2002
| | Posted on Thursday, July 10, 2008 - 6:33 am: | 
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Texas Star General Operating Information
Models:
DX 250, DX 250HDV, DX 350 and DX 350HDV
These transmitters are designed for mobile or base CW operation. Powered by the 12 volt vehicle battery or 12 volt regulated power supply, the maximum power output is less than 5 watts RMS. Frequency of operation is within the 10 meter band, determined by installation of a crystal into the oscillator board. The transmitters contain a transmit/receive relay and an output connector for the receiver to share the antenna and permit break-in operation.
OPERATION:
Red "POWER" Button turns the unit on and off.
White "REC AMP" Button turns the receive amplifier on to provide 6dB of gain for your receiver. This will work independently of the power button -- that is, the white button may be pressed "on" even when the red button is "off." The oscillator may be operated without any output to the antenna. You will be able to hear the signal in your receiver. This may be useful to adjust your electronic keyer or to practice your Morse Code "off the air."
Green Button reduces power as follows:
"DIAL-A-WATT" switches the power output potentiometer into the circuit on models that feature variable power.
"SELECT-A-WATT" switches the output to low power on models without a variable control.
Yellow "DELAY" Button reduces power and adds delay to the transmit/receive relay to accommodate different transmission rates for break-in keying operation. (A Delay Rocker Switch is located on the back of those models that have only three push buttons on the front.)
Meter is an RF Relative Output Indicator and lights during transmission.
A Crystal made for series operation must be installed into the holes labeled "X-1" near the top of the oscillator board. The frequency should fall between 28.0 MHz and 29.7 MHz.
Key Jack for 1/8" miniature phone plug is located on the rear of the unit for connection of the telegraph key.
Power Cables are also located at the rear. The yellow lead connects to the positive side of the power supply, and the black lead connects to the negative side.
Antenna Connector (SO239) for 50 ohm antenna is located on the rear.
Radio Connector (SO239) for 50 ohm output to the receiver is also located on the rear.
SPECIFICATIONS:
Frequency Range
28.0 MHz to 29.7 MHz
Stability
50 parts per million, 0-50 degrees Celsius with typical quartz crystal
Power Output
< 5 watts
Voltage
13.6 volts DC
Amps
< 4
Impedance
50 ohms
Duty Cycle
100% at full output
Harmonics
> 30dB down
Dimensions
3-1/4"(H) x 5-1/4"(W) x 8"(D)
Weight
3-1/2 pounds
Lonnie~Tech808
CEF#0808/HAM#001/CVC#0002
Tech808@copperelectronics.com
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Foxhunter
Junior Member
Username: Foxhunter
Post Number: 39
Registered: 4-2008
| | Posted on Friday, July 11, 2008 - 11:23 pm: |
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Hey Tech808---I just wanted to thank you for posting this information here on the Forum. It's very much appreciated. I know there are probably many more who felt the information you provided is very useful-----Thanks, Foxhunter |
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