Alpha Delta PathMinder Посібник - Сторінка 2
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Друкувати сторінкуPathMINDER
Digital Coax Switch
The PathMINDER is a six position, digitally controlled, coax switch. It provides features
never before found in an RF coax switch. As a normal switch, it can switch up to 6 coax
outputs with the press of a soft-touch front panel button. Internal relays handle up to
1500 watts on HF with very little insertion loss.
The internal microprocessor monitors the system to ensure maximum protection for the
user. It is nearly impossible to "hot switch" the unit. That prevents burn out of contacts
or load changes while transmitting (a serious problem with all mechanical switches). An
alarm LED flashes to alert the operator that they tried to "hot switch" but the
PathMINDER protected them.
The microprocessor also monitors a radio sensing input and will automatically ground
inputs when the radio is turned off. A simple wire interface to any radio output that
provides a DC voltage when on is all that is required. This provides an unparalleled
level of lightning protection when used in combination with a radio's "auto-off" timer. No
more forgetting to ground the antennas when not operating. To provide maximum
protection, the user should connect a good earth ground to the PathMINDER's ground
connection on the back panel.
The PathMINDER is supplied with two cables that can be used for power and/or radio
sense control. On both cables, the red is positive and the black is negative. Each input
is protected against reverse power. The power and control jack is a standard 5.5 x 2.5
mm coaxial jack with the center conductor positive.
The power input can be any DC voltage between 11 and 15 volts. The maximum current
draw is 250 mA.
The radio sense control is intended to be connected to a voltage source on the users
radio. Most radios have a +5 or +12 source provided in an accessory jack on the back.
This source can be connected to the radio sense control to ground all coax input when
the radio is powered off. It is not necessary to use the radio sense feature of the
PathMINDER.
There are three modes associated with the radio sense control. To select the radio
sensor mode, the user will press switch one and two at the same time. This will cycle
through the three radio sensor modes, and then repeat. When the radio sensor mode
changes to off, the alarm LED will light steady on for two seconds. When the radio
sensor mode changes to ground all except position six, the alarm LED will flash slowly
for two seconds. The selection LED for position six will be lit. When the radio sensor
mode changes to ground all, the alarm LED will flash fast for two seconds.