Today's Message Index:
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1. 02:37 AM - Re: Comm Antennas ()
2. 05:24 AM - Re: Flightcom 403 Aux inputs (Pete Howell)
3. 06:12 AM - Re: Comm Antennas (Speedy11@aol.com)
Message 1
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| Subject: | Re: Comm Antennas |
--> AeroElectric-List message posted by: <gmcjetpilot@yahoo.com>
Carlos:
To answer you question, yes that would be fine, but.....
Do you plan on using them at the same time. On near same freq
you could have an issue. Most dual panel mount radio setups
have an interconnect between dual COMs. It protects the
radio when the other one is transmitting.
Do you really need two radios? The handheld can just use
the attached portable antenna for say getting ATIS. If you
need to use it as the main radio in a pinch, like the ICOM dies,
I have a suggestion below.
Instead of two external antenna put just one bent whip antenna
on the belly forward of the main spare off to the pilot side. You
will have short coax run. ALSO if you need to, you can reach
down disconnect the coax from the antenna mounted in the floor
under the pilots leg and attach the coax to the handheld in an
emergency. The coax is out of the way just forward of the spar,
but it is still accessible. You could put a coax break anywhere.
They make commercial antenna switches to attach a portable
to the same antenna.
99% or the RV's put the antenna on the belly fwd of the spar.
Also most RV's use just one external COM antenna. Each
antenna is about 1/3 to 1/2 mph lost off of top speed. Also with
the long coax runs you will add extra weight. The area under
the belly is fine. You may worry about the gear leg blocking
the signal but this has prove to be a non issue.
The tail cone is fine but ugly in my opinion.
I assume you will have the audio out from the handheld going
into one of the ICOM aux inputs.
Cheers George
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From: "Carlos Trigo" <trigo@mail.telepac.pt>
I'm building an RV-9A and planning to install 2 comm antennas,
one for the panel radio (ICOM A-200) and the other for an handheld
backup radio. If I put both on the tail cone, one on the upper side
and the other on the bottom side of the fuselage, thus on the same
vertical plan and some 3 ft apart, are there any location associated
problems?
Carlos
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Message 2
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| Subject: | Re: Flightcom 403 Aux inputs |
--> AeroElectric-List message posted by: "Pete Howell" <pete.howell@gecko-group.com>
After some experientation (and good advice from some EE buddies -
thanks Vern) here is what worked pretty well. Each of the inputs
have a 1000 Ohm resistor and a 10uF cap in series with the input.
The exception to this is the EIS tone that just has a 150 Ohm and the
10uF cap. I tried without success to get the warning tone piped into
pin 21 of the FC403 to make it unmuted. In the end, I was happy with
this as it allows me to silence the music and warnings with one flip
of the isolate switch. The EIS also has a warning light to alert
me of engine issues. This setup provides minimal Background noise
and the radios, trafficscope, and EIS each have sufficient volume.
Pete
Message 3
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| Subject: | Re: Comm Antennas |
--> AeroElectric-List message posted by: Speedy11@aol.com
Regarding Carlos' question below, it seems to me that his antennae could be
mounted close together IF only one antenna were used at a time. Correct?
Stan Sutterfield
I'm building an RV-9A and planning to install 2 comm antennas, one for the
panel radio (ICOM A-200) and the other for an handheld backup radio.
If I put both on the tail cone, one on the upper side and the other on the
bottom side of the fuselage, thus on the same vertical plan and some 3 ft
apart, are there any location associated problems?
Carlos
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