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nulrich(at)technq.com
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 Posted: Mon Feb 05, 2007 7:47 am Post subject: Speaking of duplexers |
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Interesting discussion on antenna splitters, etc. I have one of the older
King versions of the ANT-SB mounted in my panel. I haven't inspected the
internals of it, not sure if it's superior to the Icom product. I don't
think it's available any longer.
I looked into splitters/duplexers for transceivers a few months ago and ran
across this:
http://www.comant.com/pdfs/[ci%20601]5-05.pdf
Unfortunately it's many hundreds of dollars. I have a Bendix/King KFM-985
VHF-FM transceiver in my plane (used to communicate with the Coast Guard)
and it has two transceivers. I mounted one VHF-FM antenna on the belly of my
plane, but couldn't justify mounting two, one for each transceiver. It would
be nice to use the full capabilities of the radio. There's a company that
will modify the internals of the radio to use one antenna--doesn't seem too
hard, you can only broadcast on one transceiver at once, so it's just a
matter of protecting the other one--but they want over $1,000 to do it.
Anyone have an easier (read: cheaper) solution? Not a high priority for me,
but every time I look at the radio I feel like I'm wasting half of it <g>.
Nathan
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maurv8(at)bresnan.net
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| Posted: Mon Feb 05, 2007 10:08 am Post subject: Speaking of duplexers |
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Nathan, check out:
Bob Archer's
SA-010 - T/R Switch- Allows reception on two transceivers simultaneously and on transmit the signal goes directly through the switch to a single good antenna.
Mauri
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[quote] ---
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nuckollsr(at)cox.net
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| Posted: Mon Feb 05, 2007 6:23 pm Post subject: Speaking of duplexers |
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At 10:45 AM 2/5/2007 -0500, you wrote:
| Quote: |
Interesting discussion on antenna splitters, etc. I have one of the older
King versions of the ANT-SB mounted in my panel. I haven't inspected the
internals of it, not sure if it's superior to the Icom product. I don't
think it's available any longer.
I looked into splitters/duplexers for transceivers a few months ago and ran
across this:
http://www.comant.com/pdfs/[ci%20601]5-05.pdf
Unfortunately it's many hundreds of dollars. I have a Bendix/King KFM-985
VHF-FM transceiver in my plane (used to communicate with the Coast Guard)
and it has two transceivers. I mounted one VHF-FM antenna on the belly of my
plane, but couldn't justify mounting two, one for each transceiver. It would
be nice to use the full capabilities of the radio. There's a company that
will modify the internals of the radio to use one antenna--doesn't seem too
hard, you can only broadcast on one transceiver at once, so it's just a
matter of protecting the other one--but they want over $1,000 to do it.
Anyone have an easier (read: cheaper) solution? Not a high priority for me,
but every time I look at the radio I feel like I'm wasting half of it <g>.
|
Actually, there IS a way to have two radios share one antenna
where in the non-transmitting mode, the two receivers get antenna
signals through a low gain but highly overload-resistant
pre-amp that offsets the loss of signal when power from the
receive antenna is routed simultaneously to separate receivers.
PTT for each transmitter is routed through the antenna adapter
such that the non-transmitting transceiver is isolated from the
antenna BEFORE the desired transmitter is brought up to talk. At
the same time, input to the non-talking transceiver is grounded
and the audio output muted. This takes a couple of transistors,
a handful of components and some high quality miniature relays.
Now, I've rejected this for having a hand-held share
the antenna because the whole idea for the hand-held is to be
able to communicate even when the ship's electrical system is
down. The adapter I've described needs power to do the hat-dance.
I suppose one could assume that battery bus is always going to
be available with enough power to operated an itty-bitty relay.
Hmmmm . . . maybe this is a product we should consider.
Bob . . .
----------------------------------------
( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
----------------------------------------
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