Today's Message Index:
----------------------
1. 12:38 AM - Re: Handheld transceiver alternate antenna (David Josephson)
2. 03:47 AM - Re: Re: Handheld transceiver alternate antenna (John MacCallum)
3. 04:51 AM - Re: Having several issues with my installation (curts63)
4. 06:01 AM - Re: Re: Handheld transceiver alternate antenna (BobsV35B@aol.com)
5. 07:10 AM - Re: Having several issues with my installation (curts63)
6. 09:00 AM - Re: Re: Handheld transceiver alternate antenna (Ken Ryan)
7. 02:02 PM - Re: Re: Handheld transceiver alternate antenna (John MacCallum)
8. 02:10 PM - antenna switch for handheld (Andy Elliott)
9. 02:14 PM - Re: Re: Handheld transceiver alternate antenna (John MacCallum)
10. 02:22 PM - Re: Re: Handheld transceiver alternate antenna (Ken Ryan)
11. 02:27 PM - Shield grounds (Aeroelectric)
12. 02:34 PM - Re: Re: Handheld transceiver alternate antenna (Bill Maxwell)
13. 03:05 PM - Re: Re: Handheld transceiver alternate antenna (rv7a.builder)
14. 06:28 PM - Re: Re: Handheld transceiver alternate antenna (Dj Merrill)
15. 06:32 PM - Re: Re: Handheld transceiver alternate antenna (Robert L. Nuckolls, III)
Message 1
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Subject: | Re: Handheld transceiver alternate antenna |
On Feb 25, 2015, at 12:00 AM, jrevens@comcast.net wrote:
> To clarify a little, I was thinking of installing a BNC tee in the line between
> the panel mounted radio and the antenna. Then I would bring a short "branch"
> from that tee to a panel-mounted male BNC, and possibly close that off with the
> proper terminating cap until it is used. I would have a short section of antenna
> cable with connectors already attached to and stored with the handheld. Would
> this kind of arrangement have shortcomings in the way of signal strength
> or other losses?
Yes, many. It won't work. RF is not like water pipe. Besides damaging whichever
radio was not transmitting, the impedance mismatch would badly compromise receive
and transmit range.
Message 2
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Subject: | Re: Handheld transceiver alternate antenna |
Yes RF is not like water. It's far more fickle and you can't use a
terminating cap because of the power involved during transmit. You would fry
a terminating resistor that was plugged into the free port plus the
impedance would be halved. Hence an SWR of 2:1 before it even gets to the
antenna.
A tee in the feedline is not a good idea. It will work but there are a lot
of things that can go wrong with that setup. Up to and including
accidently transmitting into your HH with the ships radio or visa versa.
It is best to use a Coaxial switch or have a patch panel.
To make a Patch panel you will need one BNC socket (female) and one
Connector (male) mounted on a small bracket and a Jumper Lead with one
Connector and one socket. The Jumper plugs into the Ships Radio via a socket
and a socket on the other end goes to the Antenna via the from the
connector. You disconnect the Ships Radio end of the jumper and plug into
the hand held. The reason for making the jumper male and female is so you
don't accidently plug into the Ships radio with the
Hand Held. Don't laugh it is easy done! I still vote for a coaxial switch
it's a lot easier. They can be bought for not much money from a Ham Radio
supplier.
Cheers
John MacCallum
VH-DUU
RV 10 # 41016
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of David
Josephson
Sent: Wednesday, 25 February 2015 7:38 PM
Subject: AeroElectric-List: Re: Handheld transceiver alternate antenna
--> <dlj04@josephson.com>
On Feb 25, 2015, at 12:00 AM, jrevens@comcast.net wrote:
> To clarify a little, I was thinking of installing a BNC tee in the
> line between the panel mounted radio and the antenna. Then I would bring a
short "branch"
> from that tee to a panel-mounted male BNC, and possibly close that off
> with the proper terminating cap until it is used. I would have a short
> section of antenna cable with connectors already attached to and
> stored with the handheld. Would this kind of arrangement have
> shortcomings in the way of signal strength or other losses?
Yes, many. It won't work. RF is not like water pipe. Besides damaging
whichever radio was not transmitting, the impedance mismatch would badly
compromise receive and transmit range.
Message 3
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Subject: | Re: Having several issues with my installation |
I'm located in eastern PA.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=438703#438703
Message 4
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Subject: | Re: Handheld transceiver alternate antenna |
Good Morning All,
Just to jump in on a message already well answered, I would like to add my
thoughts.
We have a Piper Pacer equipped with just one radio. A Garmin 430W. The
aircraft is flown IFR regularly.
In order to add a bit of reliable back up, we do carry a handheld and have
installed a separate external antenna just for that radio. It is a bit of
extra drag and a bit more weight, but when a back up is actually needed, it
is nice to know that the unit has an antenna all of it's own. Just my idea
of a full backup totally separated from the primary radio system.
Decisions, decisions. All the time decisions! <G>
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
PA-20
Brookeridge Air Park LL22
Downers Grove, IL
Message 5
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Subject: | Re: Having several issues with my installation |
I'm ashamed and embarassed by my doodling, but here is a sketch of what I have.
Remember, I don't know the correct symbols, terms, or designs that engineers
should use. This can be the drawing you hang around the office for others to
mock.
The one drawing shows the basic wiring idea. The battery is grounded to the firewall,
starter, and both ground blocks. The power goes from the battery to the
starter solenoid, also from the battery to the shunt- then splits to the power
panel with built in switches and some type of self resetting fuses to the relay
which provides power to the other bus. You'll have to excuse my not remembering
the exact way the relays are wired, but it does work for battery backup.
The alternator has two wires to the regulator, the regulator is grounded to
the firewall and feeds back to the battery (there is a sense wire that turns
on/off the regulator).
The "main bus" has actual circuit breakers mounted to a copper strip. These power
the avionics , such as radios, transponder, GDL, GPS, ADHRS, and one EFIS.
I believe all shielded wires used are grounded on the backshell and floating on
the other ends. Regular power and ground for individual units are not shielded.
The interconnect for the Garmin items use a canbus or RS232, with twisted
and shielded pairs.
http://centroidproducts.com/3wire.htm
this is where the fuel probes come from. The power, ground and sense connect to
the GEA-24 and use 5v reference.
If you have any other questions, please ask and I'll attempt to answer the best
I can. If someone feels they can help, feel free to ask for my cell number and
we can talk to better understand.
Thanks,
Curt
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=438710#438710
Attachments:
http://forums.matronics.com//files/schematic_2_988.pdf
http://forums.matronics.com//files/schematic_1_130.pdf
Message 6
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Subject: | Re: Handheld transceiver alternate antenna |
Attached is a pdf data sheet for a coaxial switch. Question: would this
switch be a good choice?
On Wed, Feb 25, 2015 at 2:46 AM, John MacCallum <john.maccallum@bigpond.com>
wrote:
> john.maccallum@bigpond.com>
>
> Yes RF is not like water. It's far more fickle and you can't use a
> terminating cap because of the power involved during transmit. You would
> fry
> a terminating resistor that was plugged into the free port plus the
> impedance would be halved. Hence an SWR of 2:1 before it even gets to the
> antenna.
> A tee in the feedline is not a good idea. It will work but there are a lot
> of things that can go wrong with that setup. Up to and including
> accidently transmitting into your HH with the ships radio or visa versa.
>
> It is best to use a Coaxial switch or have a patch panel.
>
> To make a Patch panel you will need one BNC socket (female) and one
> Connector (male) mounted on a small bracket and a Jumper Lead with one
> Connector and one socket. The Jumper plugs into the Ships Radio via a
> socket
> and a socket on the other end goes to the Antenna via the from the
> connector. You disconnect the Ships Radio end of the jumper and plug into
> the hand held. The reason for making the jumper male and female is so you
> don't accidently plug into the Ships radio with the
> Hand Held. Don't laugh it is easy done! I still vote for a coaxial switch
> it's a lot easier. They can be bought for not much money from a Ham Radio
> supplier.
>
>
> Cheers
>
> John MacCallum
> VH-DUU
> RV 10 # 41016
>
>
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of David
> Josephson
> Sent: Wednesday, 25 February 2015 7:38 PM
> To: AeroElectric-List Digest Server
> Subject: AeroElectric-List: Re: Handheld transceiver alternate antenna
>
> --> <dlj04@josephson.com>
>
>
> On Feb 25, 2015, at 12:00 AM, jrevens@comcast.net wrote:
>
> > To clarify a little, I was thinking of installing a BNC tee in the
> > line between the panel mounted radio and the antenna. Then I would bring
> a
> short "branch"
> > from that tee to a panel-mounted male BNC, and possibly close that off
> > with the proper terminating cap until it is used. I would have a short
> > section of antenna cable with connectors already attached to and
> > stored with the handheld. Would this kind of arrangement have
> > shortcomings in the way of signal strength or other losses?
>
> Yes, many. It won't work. RF is not like water pipe. Besides damaging
> whichever radio was not transmitting, the impedance mismatch would badly
> compromise receive and transmit range.
>
>
Message 7
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Subject: | Re: Handheld transceiver alternate antenna |
Probably a little bit of overkill for what you want it for. That
particular one has a relay so that you can remote switch it. You can get
good
quality manual ones for a lot less than what that will cost although of
course not quite as neat and tidy as a remote mounted switch such as
that.
A quick search around I can find some N type connector switches for
around $50. You would need to terminate the Antenna Feedline with and N
connector
for the one in the link below but that=99s actually a better
specification than BNC. If you look around a bit you could probably find
a BNC terminated type.
http://www.hamradio.com/detail.cfm?pid=H0-003421
Cheers
John MacCallum
VH-DUU
RV 10 # 41016
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Ken
Ryan
Sent: Thursday, 26 February 2015 3:58 AM
Subject: Re: AeroElectric-List: Re: Handheld transceiver alternate
antenna
Attached is a pdf data sheet for a coaxial switch. Question: would this
switch be a good choice?
On Wed, Feb 25, 2015 at 2:46 AM, John MacCallum
<john.maccallum@bigpond.com> wrote:
<john.maccallum@bigpond.com>
Yes RF is not like water. It's far more fickle and you can't use a
terminating cap because of the power involved during transmit. You would
fry
a terminating resistor that was plugged into the free port plus the
impedance would be halved. Hence an SWR of 2:1 before it even gets to
the
antenna.
A tee in the feedline is not a good idea. It will work but there are a
lot
of things that can go wrong with that setup. Up to and including
accidently transmitting into your HH with the ships radio or visa versa.
It is best to use a Coaxial switch or have a patch panel.
To make a Patch panel you will need one BNC socket (female) and one
Connector (male) mounted on a small bracket and a Jumper Lead with one
Connector and one socket. The Jumper plugs into the Ships Radio via a
socket
and a socket on the other end goes to the Antenna via the from the
connector. You disconnect the Ships Radio end of the jumper and plug
into
the hand held. The reason for making the jumper male and female is so
you
don't accidently plug into the Ships radio with the
Hand Held. Don't laugh it is easy done! I still vote for a coaxial
switch
it's a lot easier. They can be bought for not much money from a Ham
Radio
supplier.
Cheers
John MacCallum
VH-DUU
RV 10 # 41016
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of David
Josephson
Sent: Wednesday, 25 February 2015 7:38 PM
Subject: AeroElectric-List: Re: Handheld transceiver alternate antenna
--> <dlj04@josephson.com>
On Feb 25, 2015, at 12:00 AM, jrevens@comcast.net wrote:
> To clarify a little, I was thinking of installing a BNC tee in the
> line between the panel mounted radio and the antenna. Then I would
bring a
short "branch"
> from that tee to a panel-mounted male BNC, and possibly close that off
> with the proper terminating cap until it is used. I would have a short
> section of antenna cable with connectors already attached to and
> stored with the handheld. Would this kind of arrangement have
> shortcomings in the way of signal strength or other losses?
Yes, many. It won't work. RF is not like water pipe. Besides damaging
whichever radio was not transmitting, the impedance mismatch would badly
compromise receive and transmit range.
-
Electric-List"
target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
FORUMS -
_blank">http://forums.matronics.com
b Site -
-Matt Dralle, List Admin.
target="_blank">http://www.matronics.com/contribution
Message 8
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Subject: | antenna switch for handheld |
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.
I made one of these myself maybe 10-12 years ago for an old airplane,
but nowadays would just spend the money! Basically, it is a
soldered-closed brass box with two BNC connectors on the back and a
3.5mm audio plug jack with a NC switch on the front. Lots of variety on
Mouser. (My homemade version used a 1/4" plug.) Closed brass box
protects the signal from interference.
The thing is wired so that input BNC from the panel-mount is connected
to the output BNC to the antenna through the NC switch when the jack is
empty. When you connect the handheld, the plug opens the switch in the
jack and disconnects the panel mount, while connecting the handheld to
the antenna. Pretty idiot proof.
FWIW,
Andy Elliott
Message 9
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Subject: | Re: Handheld transceiver alternate antenna |
Yes Bob that was something else I thought about to suggest. If the extra
drag is not an issue a dedicated antenna is a good solution.
Cheers
John MacCallum
VH-DUU
RV 10 # 41016
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
BobsV35B@aol.com
Sent: Thursday, 26 February 2015 1:00 AM
Subject: Re: AeroElectric-List: Re: Handheld transceiver alternate antenna
Good Morning All,
Just to jump in on a message already well answered, I would like to add my
thoughts.
We have a Piper Pacer equipped with just one radio. A Garmin 430W. The
aircraft is flown IFR regularly.
In order to add a bit of reliable back up, we do carry a handheld and have
installed a separate external antenna just for that radio. It is a bit of
extra drag and a bit more weight, but when a back up is actually needed, it
is nice to know that the unit has an antenna all of it's own. Just my idea
of a full backup totally separated from the primary radio system.
Decisions, decisions. All the time decisions! <G>
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
PA-20
Brookeridge Air Park LL22
Downers Grove, IL
Message 10
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Subject: | Re: Handheld transceiver alternate antenna |
Not considering price, are the specs what they should be? And to those
suggesting the switch is the best solution, wouldn't there exist the danger
of the switch being in the wrong position, and then trying to transmit with
the equivalent of "no antenna" attached? I've heard that's not a smart
thing to do.
On Wed, Feb 25, 2015 at 12:59 PM, John MacCallum <john.maccallum@bigpond.co
m
> wrote:
> Probably a little bit of overkill for what you want it for. That
> particular one has a relay so that you can remote switch it. You can get
> good
>
> quality manual ones for a lot less than what that will cost although of
> course not quite as neat and tidy as a remote mounted switch such as that
.
>
>
> A quick search around I can find some N type connector switches for aroun
d
> $50. You would need to terminate the Antenna Feedline with and N connecto
r
>
> for the one in the link below but that=99s actually a better specif
ication
> than BNC. If you look around a bit you could probably find a BNC terminat
ed
> type.
>
>
> http://www.hamradio.com/detail.cfm?pid=H0-003421
>
>
> Cheers
>
>
> John MacCallum
>
> VH-DUU
>
> RV 10 # 41016
>
>
> *From:* owner-aeroelectric-list-server@matronics.com [mailto:
> owner-aeroelectric-list-server@matronics.com] *On Behalf Of *Ken Ryan
> *Sent:* Thursday, 26 February 2015 3:58 AM
> *To:* aeroelectric-list@matronics.com
> *Subject:* Re: AeroElectric-List: Re: Handheld transceiver alternate
> antenna
>
>
> Attached is a pdf data sheet for a coaxial switch. Question: would this
> switch be a good choice?
>
>
> On Wed, Feb 25, 2015 at 2:46 AM, John MacCallum <
> john.maccallum@bigpond.com> wrote:
>
> john.maccallum@bigpond.com>
>
> Yes RF is not like water. It's far more fickle and you can't use a
> terminating cap because of the power involved during transmit. You would
> fry
> a terminating resistor that was plugged into the free port plus the
> impedance would be halved. Hence an SWR of 2:1 before it even gets to the
> antenna.
> A tee in the feedline is not a good idea. It will work but there are a lo
t
> of things that can go wrong with that setup. Up to and including
> accidently transmitting into your HH with the ships radio or visa versa.
>
> It is best to use a Coaxial switch or have a patch panel.
>
> To make a Patch panel you will need one BNC socket (female) and one
> Connector (male) mounted on a small bracket and a Jumper Lead with one
> Connector and one socket. The Jumper plugs into the Ships Radio via a
> socket
> and a socket on the other end goes to the Antenna via the from the
> connector. You disconnect the Ships Radio end of the jumper and plug into
> the hand held. The reason for making the jumper male and female is so you
> don't accidently plug into the Ships radio with the
> Hand Held. Don't laugh it is easy done! I still vote for a coaxial switc
h
> it's a lot easier. They can be bought for not much money from a Ham Radio
> supplier.
>
>
> Cheers
>
> John MacCallum
> VH-DUU
> RV 10 # 41016
>
>
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of David
> Josephson
> Sent: Wednesday, 25 February 2015 7:38 PM
> To: AeroElectric-List Digest Server
> Subject: AeroElectric-List: Re: Handheld transceiver alternate antenna
>
> --> <dlj04@josephson.com>
>
>
> On Feb 25, 2015, at 12:00 AM, jrevens@comcast.net wrote:
>
> > To clarify a little, I was thinking of installing a BNC tee in the
> > line between the panel mounted radio and the antenna. Then I would brin
g
> a
> short "branch"
> > from that tee to a panel-mounted male BNC, and possibly close that off
> > with the proper terminating cap until it is used. I would have a short
> > section of antenna cable with connectors already attached to and
> > stored with the handheld. Would this kind of arrangement have
> > shortcomings in the way of signal strength or other losses?
>
> Yes, many. It won't work. RF is not like water pipe. Besides damaging
> whichever radio was not transmitting, the impedance mismatch would badly
> compromise receive and transmit range.
>
>
> ==========
> -
> Electric-List" target="_blank">
> http://www.matronics.com/Navigator?AeroElectric-List
> ==========
> FORUMS -
> _blank">http://forums.matronics.com
> ==========
> b Site -
> -Matt Dralle, List Admin.
> target="_blank">http://www.matronics.com/contribution
> ==========
>
>
> *
>
===========
www.matronics.com/Navigator?AeroElectric-List>
===========
===========
om/contribution>
===========
>
> *
>
>
Message 11
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I thought I understood how shield grounds worked and how to implement them but
now looking at a Garmin G3X. The garmin manual specifically has some of the shields
terminated on both ends and grounded. some of the shields are only terminated
and grounder on one end and the other is floating. So what is the proper
termination of shields and what is the science behind the proper methods.
John Snapp
( excuse the typos. This email was sent from a mobile device!)
Message 12
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|
Subject: | Re: Handheld transceiver alternate antenna |
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.
Bill
On 26/02/2015 3:58 AM, Ken Ryan wrote:
> Attached is a pdf data sheet for a coaxial switch. Question: would
> this switch be a good choice?
>
> On Wed, Feb 25, 2015 at 2:46 AM, John MacCallum
> <john.maccallum@bigpond.com <mailto:john.maccallum@bigpond.com>> wrote:
>
> <john.maccallum@bigpond.com <mailto:john.maccallum@bigpond.com>>
>
> Yes RF is not like water. It's far more fickle and you can't use a
> terminating cap because of the power involved during transmit. You
> would fry
> a terminating resistor that was plugged into the free port plus the
> impedance would be halved. Hence an SWR of 2:1 before it even gets
> to the
> antenna.
> A tee in the feedline is not a good idea. It will work but there
> are a lot
> of things that can go wrong with that setup. Up to and including
> accidently transmitting into your HH with the ships radio or visa
> versa.
>
> It is best to use a Coaxial switch or have a patch panel.
>
> To make a Patch panel you will need one BNC socket (female) and one
> Connector (male) mounted on a small bracket and a Jumper Lead with one
> Connector and one socket. The Jumper plugs into the Ships Radio
> via a socket
> and a socket on the other end goes to the Antenna via the from the
> connector. You disconnect the Ships Radio end of the jumper and
> plug into
> the hand held. The reason for making the jumper male and female is
> so you
> don't accidently plug into the Ships radio with the
> Hand Held. Don't laugh it is easy done! I still vote for a
> coaxial switch
> it's a lot easier. They can be bought for not much money from a
> Ham Radio
> supplier.
>
>
> Cheers
>
> John MacCallum
> VH-DUU
> RV 10 # 41016
>
>
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> <mailto:owner-aeroelectric-list-server@matronics.com>
> [mailto:owner-aeroelectric-list-server@matronics.com
> <mailto:owner-aeroelectric-list-server@matronics.com>] On Behalf
> Of David
> Josephson
> Sent: Wednesday, 25 February 2015 7:38 PM
> To: AeroElectric-List Digest Server
> Subject: AeroElectric-List: Re: Handheld transceiver alternate antenna
>
> --> <dlj04@josephson.com <mailto:dlj04@josephson.com>>
>
>
> On Feb 25, 2015, at 12:00 AM, jrevens@comcast.net
> <mailto:jrevens@comcast.net> wrote:
>
> > To clarify a little, I was thinking of installing a BNC tee in the
> > line between the panel mounted radio and the antenna. Then I
> would bring a
> short "branch"
> > from that tee to a panel-mounted male BNC, and possibly close
> that off
> > with the proper terminating cap until it is used. I would have a
> short
> > section of antenna cable with connectors already attached to and
> > stored with the handheld. Would this kind of arrangement have
> > shortcomings in the way of signal strength or other losses?
>
> Yes, many. It won't work. RF is not like water pipe. Besides damaging
> whichever radio was not transmitting, the impedance mismatch would
> badly
> compromise receive and transmit range.
>
>
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Subject: | Re: Handheld transceiver alternate antenna |
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Subject: | Re: Handheld transceiver alternate antenna |
I have a Narco VP-16 antenna switch that I will sell for $25 including
shipping in the continental US. It uses BNC connectors, and switches
one antenna between two radios. It is essentially an electrical relay
that switches with 12v. Wiring connector included.
Pic on my website
http://deej.net/forsale/
-Dj
--
Dj Merrill - N1JOV - EAA Chapter 87
Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/
Glastar Flyer N866RH - http://deej.net/glastar/
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Subject: | Re: Handheld transceiver alternate antenna |
At 16:34 2015-02-25, you wrote:
>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 . . .
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