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bertrv6(at)gmail.com
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 Posted: Tue Jan 01, 2008 10:21 am Post subject: Radio antenas? |
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Hello:
HAPPY NEW YEAR TO ALL....'''''
MY first posting in 08.....
I am planning to buy a second radio for my rv6a..., question now is
do I have to have another antena? I hope I do not have to do that..
What is the next way to do this, so I can use both radios with one antena..??
Thanks
Bert rv6a
do not archive
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n223rv(at)wolflakeairport
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| Posted: Tue Jan 01, 2008 11:01 am Post subject: Radio antenas? |
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You can buy a splitter that allows 1 antenna to split to 2 radios. Aircraft Spruce sells them.
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Tue Jan 01, 2008 11:27 am Post subject: Radio antenas? |
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That will work for reception, but the minute you key one of the
transmitters you will destroy the other receiver. You have to have a
means to physically disconnect the unused receiver from the antenna the
transmitter is using. Audio panels are the most common way to do it, but
not the only answer.
Michael Kraus wrote:
[quote]
You can buy a splitter that allows 1 antenna to split to 2 radios. Aircraft Spruce sells them.
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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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khorton01(at)rogers.com
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| Posted: Tue Jan 01, 2008 11:35 am Post subject: Radio antenas? |
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Aircraft Spruce does sell splitters that allow two Nav receivers to be
connected to one antenna. But I don't think they sell a similar
solution for Com radios. The two radios with one antenna problem is a
lot more complex with transmitters, as you need a solution that
decouples the two radios when one of them transmits. Otherwise the
power transmitted by one radio would follow the coax into the receiver
of the other radio - the power level at the receiver would be much,
much greater than it was designed for, and it would likely be destroyed.
The simplest, cheapest solution will be to have two antennae. If you
are worried about drag, consider a foil antenna on the inside of the
canopy for Com 2. That is a very light, cheap, zero drag and
supposedly effective solution.
Kevin Horton
On 1-Jan-08, at 13:59 , Michael Kraus wrote:
[quote]
>
You can buy a splitter that allows 1 antenna to split to 2 radios.
Aircraft Spruce sells them.
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ceengland(at)bellsouth.ne
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| Posted: Tue Jan 01, 2008 2:09 pm Post subject: Radio antenas? |
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Bert Murillo wrote:
| Quote: |
Hello:
HAPPY NEW YEAR TO ALL....'''''
MY first posting in 08.....
I am planning to buy a second radio for my rv6a..., question now is
do I have to have another antena? I hope I do not have to do that..
What is the next way to do this, so I can use both radios with one antena..??
Thanks
Bert rv6a
do not archive
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Hi Bert,
You can do it with what amounts to a 'smart' antenna relay, but it's
cheaper & more reliable to just add a 2nd antenna.
Sorry...
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Mark Sletten
Joined: 10 Jan 2006
Posts: 43
Location: St. Jacob, IL (Near St. Louis, MO)
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gmcjetpilot
Joined: 04 Nov 2006
Posts: 170
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| Posted: Wed Jan 02, 2008 10:47 am Post subject: Radio antenas? |
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| Quote: | From: "Bert Murillo" <bertrv6(at)gmail.com>
Subject: Radio antenas?
I am planning to buy a second radio for my rv6a..., question now is
do I have to have another antenna? I hope I do not have to do that..
What is the next way to do this, so I can use both radios with one
>antenna..?? Thanks, Bert rv6a
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The replies you got are good and agree, but let me point out a few things.
1st, your best bet (in my opinion) is just get another bent whip an put on the belly or the back of the planes fuselage (external). It will cost you about 1/3 mph at 200mph, no big deal.
2nd, they do make a two transmitter into one antenna device but its very very expensive and I don't think Spruce A/C sells them. The one poster was thinking of NAV antenna splitters, receivers. However having two transceiver on one antenna is a recipe for blowing up a radio. Yes you could manually install a switch but that's just silly, why have two radios at all. Granted you can only transmit at one time.
3rd, the suggestion of installing a hidden antenna is cool, wing tip, windscreen or cowl but they SUCK. Yea they "WORK" but work means some really reduced performance. There is NO substitute for a 1/4 wave antenna on a GOOD ground plan with vertical polarization. There is no debate. The wing tip antennas do not work well. If my radio can't transmit and receive at least 100-150 miles at altitude than its not a good installation.
Last, mount the second antenna and be done with it. You can handle a lousy 0.33 mph loss in speed for a bent whip.
PS: (Note: you need about three feet between antennas ideally, give or take, but also don't forget to connect the radio interconnect for two radios. When you transmit the interconnect turns the other radio's receiver off when you transmit. Most or all radios have this wire, usually a single wire interconnect when you install two radios. Call the radio manufacture if in doubt. Even with two antennas separated by distance, transmitting can bleed over even with the radio off freq.)
All the best Happy New Years George
[quote][b]
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