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haribole
Joined: 21 Feb 2014
Posts: 33
Location: United States
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 Posted: Mon Mar 30, 2015 8:23 am Post subject: Handheld transceiver alternate antenna |
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Found this article in kitplanes archive which describes a $2 antenna diplexer.
http://tinyurl.com/nz6q8qb
On Wed, Feb 25, 2015 at 9:30 PM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
[quote] At 16:34 2015-02-25, you wrote:
| Quote: | | It could be made to work Ken but it is more complicated than necessary. It also needs a 12 volt supply and utilises SMA connectors. I suggest you look for a much simpler mechanical switch type. They are commonly available from ham radio suppliers and usually are fitted with SO-239 connectors. Connection is selected by simply turning a knob or flicking a switch. Better reliability. |
Most COTS antenna switches are designed
to select from two or more antennas to a
single transceiver/receiver . . . there
are no concerns for leaving "the alternate
transceiver" unterminated.
It turns out that ICOM produces a convenient little, optionally
panel-mounted device for exactly what you need, under the name Antenna
Switchbox, P/N IC-ANT-SB, which can be had for $64 from Aircraft Spruce
including the BNC-terminate interconnect cable for your handheld.
Yes, I purchased one about a dozen years ago
and dissected it.
http://tinyurl.com/nn2sysd
http://tinyurl.com/pp6tzgv
. . . yes, it performs as advertised but not
very sanitary with respect to managing a
transmission line. Another concern for me was
a kind flimsy, normally-closed contact on the jack that
was supposed provide center-conductor integrity
through the adapter. Finally, the ICOM product
was pretty over-sized to the task. I fiddled with
a DIY version . . .
http://tinyurl.com/kluld58
. . . that didn't put as bit a 'lump' in the
transmission line's RF profile. It was a lot less
demanding of panel real estate. But it still
offered lackluster robustness due to quality
of the n.c. audio jack being pressed into
service as a coax connector.
I toyed with the idea of offering a crew
accessible antenna switch that would terminate
the OFF transceiver line in a little dummy load.
I think I offered to bring one into being as an
AEC product if I could get a commitment for
purchase of some small quantity of units . . .
I think it was ten.
That didn't rise off the ground either. SSSsoooooo . . .
a completely independent antenna or a DIY 'patch
cable' of some arrangement are the elegant
choices.
Bob . . . | Quote: |
ist" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
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wrmaxwell(at)bigpond.com
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| Posted: Mon Mar 30, 2015 2:48 pm Post subject: Handheld transceiver alternate antenna |
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Strictly speaking, I don't think it qualifies as a diplexer but it should certainly work.
On 31/03/2015 3:22 AM, Hariharan Gopalan wrote:
[quote] Found this article in kitplanes archive which describes a $2 antenna diplexer.
http://tinyurl.com/nz6q8qb
On Wed, Feb 25, 2015 at 9:30 PM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: | At 16:34 2015-02-25, you wrote:
| Quote: | | It could be made to work Ken but it is more complicated than necessary. It also needs a 12 volt supply and utilises SMA connectors. I suggest you look for a much simpler mechanical switch type. They are commonly available from ham radio suppliers and usually are fitted with SO-239 connectors. Connection is selected by simply turning a knob or flicking a switch. Better reliability. |
Most COTS antenna switches are designed
to select from two or more antennas to a
single transceiver/receiver . . . there
are no concerns for leaving "the alternate
transceiver" unterminated.
It turns out that ICOM produces a convenient little, optionally
panel-mounted device for exactly what you need, under the name Antenna
Switchbox, P/N IC-ANT-SB, which can be had for $64 from Aircraft Spruce
including the BNC-terminate interconnect cable for your handheld.
Yes, I purchased one about a dozen years ago
and dissected it.
http://tinyurl.com/nn2sysd
http://tinyurl.com/pp6tzgv
. . . yes, it performs as advertised but not
very sanitary with respect to managing a
transmission line. Another concern for me was
a kind flimsy, normally-closed contact on the jack that
was supposed provide center-conductor integrity
through the adapter. Finally, the ICOM product
was pretty over-sized to the task. I fiddled with
a DIY version . . .
http://tinyurl.com/kluld58
. . . that didn't put as bit a 'lump' in the
transmission line's RF profile. It was a lot less
demanding of panel real estate. But it still
offered lackluster robustness due to quality
of the n.c. audio jack being pressed into
service as a coax connector.
I toyed with the idea of offering a crew
accessible antenna switch that would terminate
the OFF transceiver line in a little dummy load.
I think I offered to bring one into being as an
AEC product if I could get a commitment for
purchase of some small quantity of units . . .
I think it was ten.
That didn't rise off the ground either. SSSsoooooo . . .
a completely independent antenna or a DIY 'patch
cable' of some arrangement are the elegant
choices.
Bob . . .
|
[b]
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