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jbr79r(at)yahoo.com
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 Posted: Mon Feb 14, 2011 10:09 pm Post subject: 2nd radio |
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I am considering a second radio. I currently have a SL30. I would like to add a second radio, but only have 1 antenna. Can 2 radios share 1 antenna? Are there problems with this approach? Will I have to add a audio panel?
Jim
James Robinson
Glasair lll N79R
Spanish Fork UT U77
From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>
To: aeroelectric-list(at)matronics.com
Sent: Mon, February 14, 2011 9:06:47 AM
Subject: Re: Power for Checking Systems Out on the Ground
| Quote: | | Can I hook the power supply up to the battery + and - terminals and use it as a "battery booster" (or would this toast the battery)? Should I just use the battery and charge it overnight with the BatteryMINDer? Other? |
Most power supplies are NOT intended to work
in conjunction with a battery. The primary
difficulty arises when the battery is connected
to a powered down power supply. Output monitoring
and ov protection in many supplies do not like to
be "back fed" from an external power source.
My favorite technique uses a hefty switchmode
power supply similar to this:
http://tinyurl.com/4aoszlf
Combine this supply with a power diode (to
prevent back feeding) and a relay to emulate
the "field control" input on your ship's
alternator. The relay controls 120 vac going
into the power supply.
You can connect this AC mains powered "alternator"
in place of the ship's alternator. With the
alternator emulator ON, adjust the power supply
for a 14.2 volt bus.
The ship's load meter (if installed) can be
used to monitor loads on the power supply. This
will allow you to run the ship's battery in
parallel to let it pick up any transient loads
that might exceed the ratings of the power supply.
| Quote: | | I intend to bring up one circuit at a time and I want to measure each circuit's actual power consumption and I'll need to be careful not to overload the power supply. |
If it's a switchmode supply, it will have built
in overload protection. Further, the supply I
linked above has a thermostatically controlled
fan built in that turns on when the supply is
being taxed to rated output.
Bob . . . [quote]
[b]
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nuckolls.bob(at)aeroelect
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| Posted: Tue Feb 15, 2011 6:13 am Post subject: 2nd radio |
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At 12:24 AM 2/15/2011, you wrote:
| Quote: | Hi Jim
If it is possible to share an aerial, do you want to? It would be a
single point of failure for both radios... Every time I've has an
issue with my radio, it's been an antenna problem (about 4 times in
12 years). Having an independent radio is more useful to me as a
backup than a convenience, and so would require an independent
aerial. But that's me!
|
Excellent point. Antenna duplexers for transceivers
are not cheap. Two antennas are certainly the least
expensive and most reliable configuration. You don't
need an audio panel but probably an audio isolation
amplifier as described in the 'Connection's audio
chapter.
http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z16M.pdf
Bob . . .
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