> Chuck,
Yes, the Motorola MTR2000 uses the PP75 Anderson Powerpole connectors. Note,
however, that the MTR2000 uses those connectors in the one-over-the-other
arrangement, rather than side-by-side.
Although the 100 watt MTR2000 is a special case, because it operates on 28
VDC, the lower-powered stations using the DLN6624A AC power supplies do not
require the expensive Argus Technologies battery backup/charger system, if
battery backup is desired. I have devised a much less expensive method to
establish a no-break power source.
The standard AC power supply DLN6624A provides 14.2 VDC and 5.0 VDC to the
station when fed 120 VAC input. If a standard VRSLA battery is floated across
the 14.2 VDC output (at the Anderson Powerpole connector), the station will
continue to operate properly, but at the power level programmed for battery
operation in the RSS and with the periodic warning beep over the air.
The potential problem that begat the Argus Technologies backup system is that
the standard 250 watt AC power supply used on the MTR2000 is limited to 16.5
amperes output. If the station's backup battery was severely discharged, the
charging current plus the station transmit current (about 8 amperes at 40
watts) could cause the station to shut down due to excessive current draw.
The solution to this dilemma is simple, and almost too obvious: use a resistor
to limit the charging current!
My newest 2m repeater uses a simple relay to "program" the
charging/discharging current. When AC power is available, the relay (which
coil is operated from the 120 VAC power line) is pulled in and allows a Dale 2
ohm 50 watt power resistor to connect the station's 14.2 VDC power source to
the battery, keeping it charged. If the station was just recovering from an
extended power outage, the 2 ohm resistor will limit the charging current so
that the power supply can still operate the PA while keeping a charging
current flowing. But, if the AC power fails, the relay drops out and bypasses
the resistor allowing full station current to flow as needed. Remember, the
MTR2000 will automatically shut down if the DC supply voltage falls below 10
volts or so, protecting the battery from deep discharge.
I know this arrangement works perfectly with the DLN6624A 250 watt power
supply; I have not tested it with other power supplies.
73, Eric Lemmon WB6FLY
>
> > Anyone know off the top of their head which of the Anderson Power plugs
> Motorola uses on the stations (MTR2000, etc.)?
> >
> > Looking at the web site, I'm guessing the 75 Amp, but want to verify with
> someone who might have actually researched this.
> > It's going to take a couple of months to get these delivered, and I don't
> want to get it wrong.
> >
> > Thanks
> > Chuck Kimball
> > n0nhj
> >
>
>
> Yahoo! Groups Links
>
>
>
>
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