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indigoonlatigo(at)msn.com
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 Posted: Wed Nov 29, 2006 8:36 am Post subject: Stupid question revisted. |
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Okay, here is the trick. Label everything as a stupid question and get lots
of answers and all are done so with overwhelming kindness.
Lets try again.
1)Why are people placing two comm antennas.
2)And when two antennas are placed, doesn't the nontransmitting one
interfere with the transmitting one. Something like putting two tuning
forks side by side and hiting one and the other starts humming too.
Kindness only
John G.
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recapen(at)earthlink.net
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| Posted: Wed Nov 29, 2006 9:17 am Post subject: Stupid question revisted. |
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John,
For my installation and the research that I have done (check the matronics aeroelectric list archives), I'm using two antennas with two radios - placed x-number of inches apart (I don't remember the magic number) because of the issue that you have mentioned. I'm actually placing one under the belly behind the main spar and the second one is foil tape in the windshield - thinking ground vs air communications.
There are switches that allow for one antenna and two radios - to isolate the nontransmitting one's receiver circuits - but if you have an antenna failure - the second radio is useless.
It depends on what you want...I have one of the switches that I mentioned in my avionics box - I think I got it from Bob Archer. I may use it eventually - for specific missions.
Not saying right or wrong, just how I'm doing it and the basis for my decision
Hope this helps,
Ralph
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bob.kaufmann(at)cox.net
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| Posted: Wed Nov 29, 2006 6:02 pm Post subject: Stupid question revisted. |
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The reason that you use two antennas is that the switch if you use one
antenna and two radios is $700+ and the second antenna is 85 if you go with
a Bob Archer for the backup antenna.
Bob K
Wing HID installation. Two to three hours my hind end. LOL
Do not archive
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wv4i(at)bellsouth.net
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| Posted: Thu Nov 30, 2006 4:02 am Post subject: Stupid question revisted. |
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1.) Because they can....
2.) Yes, if placed too close together or wrong distance apart, and if
resonant at same freq. This may apply regardless of whether
selected/deselected by A/B antenna switch. Short answer is follow mfr's
recommendations, or call their tech line.
Somewhat analogous to placing passive RF conductive material in tactical
aircraft exterior coatings that is resonant to incoming radar signals,
i.e. not connected to anything but still reacts, is reactive...
For antenna A/B switch, simply need to get one with correct connector
types (better) or adapters, and that has low loss at working frequencies.
Like George Bush 41, hoping for a kinder, gentler America someday....
Link McGarity
#40622
tailcone
also ham radio afflicted
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jesse(at)itecusa.org
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| Posted: Thu Nov 30, 2006 6:43 am Post subject: Stupid question revisted. |
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In my research, having the antennas 30-36 inches apart will avoid these
problems. Two antennas to be able to use both radios at the same time,
often monitoring one while transmitting on the other, or listening to an
ATIS or AWOS on one while maintaining com with ATC on the other. I have
heard of the switch that allows the use of one antenna, but as others have
said, I would not spend $700, or even the same amount as an extra antenna to
avoid putting the extra antenna. Plus, it looks cool having two of them
side by side on the belly.
Do not archive.
Jesse Saint
I-TEC, Inc.
jesse(at)itecusa.org
www.itecusa.org
W: 352-465-4545
C: 352-427-0285
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flysrv10(at)gmail.com
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| Posted: Thu Nov 30, 2006 6:55 am Post subject: Stupid question revisted. |
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I believe a rule-of-thumb for antenna placement might be a distance equal or greater than the length of the antenna from other transmitting sources.
do not archive
Rob Kermanj
On Nov 30, 2006, at 9:42 AM, Jesse Saint wrote:
[quote]--> RV10-List message posted by: "Jesse Saint" <jesse(at)itecusa.org (jesse(at)itecusa.org)>
In my research, having the antennas 30-36 inches apart will avoid these
problems. Two antennas to be able to use both radios at the same time,
often monitoring one while transmitting on the other, or listening to an
ATIS or AWOS on one while maintaining com with ATC on the other. I have
heard of the switch that allows the use of one antenna, but as others have
said, I would not spend $700, or even the same amount as an extra antenna to
avoid putting the extra antenna. Plus, it looks cool having two of them
side by side on the belly.
Do not archive.
Jesse Saint
I-TEC, Inc.
jesse(at)itecusa.org (jesse(at)itecusa.org)
www.itecusa.org
W: 352-465-4545
C: 352-427-0285
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indigoonlatigo(at)msn.com
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| Posted: Thu Nov 30, 2006 8:56 am Post subject: Stupid question revisted. |
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Good point. How about one antenna and one installed radio and a back up
handheld. Less things sticking out of the airframe the better.
Thank you for the qoute on the switch.
John
[quote]From: "bob.kaufmann" <bob.kaufmann(at)cox.net>
Reply-To: rv10-list(at)matronics.com
To: <rv10-list(at)matronics.com>
Subject: RE: Stupid question revisted.
Date: Wed, 29 Nov 2006 18:02:07 -0800
The reason that you use two antennas is that the switch if you use one
antenna and two radios is $700+ and the second antenna is 85 if you go with
a Bob Archer for the backup antenna.
Bob K
Wing HID installation. Two to three hours my hind end. LOL
Do not archive
--
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