Today's Message Index:
----------------------
1. 10:47 AM - Antenna Question (Yet Another) (dgaldrich)
2. 12:40 PM - Re: Re: Removable comm antenna (Holger Selover-Stephan)
3. 06:26 PM - Re: Re: iCom batteries, was Rejuvenating Ni-MH battery (Holger Selover-Stephan)
4. 07:13 PM - Indicator Help (Owen Baker)
5. 07:45 PM - Re: Indicator Help (Richard Girard)
6. 08:45 PM - Re: Indicator Help (Bill Bradburry)
Message 1
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Subject: | Antenna Question (Yet Another) |
I am building a Pietenpol (wood fuselage) and will be installing 3 antennae. 1
VHF com, 1 ELT (121.5/406), and one transponder. The turtle deck is current
uncovered so I can install them anywhere I want. The issue is ground planes and
the question is can I use the same ground plane for the ELT and the comm with
one facing up and the other facing down with the feeds less than say 6 inches
apart. at the point where I'd like to put the two vhf antennae, the fuselage
is about 12 inches wide but the ground plane could be maybe 3 feet long and
I could get a wider ground plane by turning it 90 degrees and extending it down
the side of the fuselage.
So here are the questions:
1. Can I do the back-to-back almost collocated trick with the two VHF antennae.
If so, should they be mirror image (both angled back) or "concentric" (one
angled back and one angled front). Would using both a ferrous ( window screen?)
and non-ferrous (aluminum or copper) ground plane (sort of like a Faraday cage)
provide enough isolation bearing in mind that the ELT would be used as transmit
only when disaster strikes.
1a. Do I really care about the ELT antenna's capability on 121.5? If I go down,
it's the 406 frequency that will get SAR to me. My thinking is that the ELT
antenna's proximity to the VHF comm antenna shouldn't compromise the 406 signal.
1b. If 1a is true, then the only issue is the comm antenna radiation pattern.
Locating the antennae 1/4 wavelength apart might even help, sort of like reflectors
and directors in yagis.
2. How sensitive is the ground plane to width? Can I get away with 12 inches
by 36? Is there a benefit in extending the ground plane down the side say 6 inches
to get a 24 inch wide ground plane?
Lots of questions but it's not like the supposed question on an MIT physics exam.
"Given Maxwell's equations, derive the universe. Give two examples."
Thanks in advance
Dave
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=391278#391278
Message 2
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Subject: | Re: Removable comm antenna |
Just a quick note that I took the removable comm antenna out for a few
flights and got a "loud and clear". Thanks for all your advice, gents!
Holger
Message 3
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Subject: | Re: iCom batteries, was Rejuvenating Ni-MH battery |
On 12/29/12 8:05 PM, Glen Matejcek wrote:
>
> There is an iCom battery pack available for replaceable, non-rechargeable batteries.
As cheap as dry cells are compared to the rechargeables, and as little
as I actually use the handheld, that is the way to go for me. Should my usage
go up to the point where rechargeables make sense, I can just drop the discrete
rechargeables into the same pack-
>
> Glen Matejcek
Good tip. I use this battery pack with Eneloop rechargeable. The ICOM is
my main radio.
Holger
Message 4
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12/31/2012
Hello Bob Nuckolls and Fellow Listers, Here is the situation:
I have a spring bias pitch trim system in my KIS TR-1 experimental
amateur built airplane. I am using a Ray Allen T3-12A servo with their
RP 3 LED type indicator installed in my instrument panel. The 1.2 inch
travel of the T3-12A servo is just not enough movement to give me the
trim travel needed at both ends, nose up and nose down. See here:
http://www.rayallencompany.com/index.html
My intended solution is to purchase and install an electrical linear
actuator with a position indicator such as this:
http://www.aeicomp.com/Detail.asp?Product_ID=302.390_6102TP&Product=P
otentiometer+Feedback+2%22+Linear+Actuator+%28Speed+1%2F2%22+per+Sec%29+w
%2F10K+Ohm+Pot++%22IP65+Rated%22
My questions:
Indicator Question 1: Could I possibly use the already installed Ray
Allen LED indicator with the 10K OHM POT that this linear actuator is
equipped with? See here:
http://www.aeicomp.com/image2/AE-6102TP.pdf
and here:
http://www.rayallencompany.com/RACmedia/instructionsRP3.pdf
Indicator Question 2: If so how would I connect the three LED indicator
wires (orange, green (signal return), blue) to the three wires
(white-ground, yellow-V input, blue-RS input) of the actuator?
Indicator Question 3: Assuming that I cannot use the Ray Allen LED
indicator with this linear actuator where can I obtain an indicator that
will work with this actuator? (AEI declines to help me with this
question.)
Speed Control Question: The linear actuator is much faster than the Ray
Allen actuator and I expect that I will have to slow down the linear
actuator. What is the best way to accomplish this?
Many thanks for your help.
OC
'O C' Baker says "The best investment you can make is the effort to
gather and understand information."
Message 5
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Subject: | Re: Indicator Help |
Owen, You can save $30 by getting it here.
https://www.surpluscenter.com/item.asp?item=5-1577-2&catname=electric
Rick Girard
On Mon, Dec 31, 2012 at 9:12 PM, Owen Baker <bakerocb@cox.net> wrote:
> 12/31/2012
>
> Hello Bob Nuckolls and Fellow Listers, Here is the situation:
>
> I have a spring bias pitch trim system in my KIS TR-1 experimental amateur
> built airplane. I am using a Ray Allen T3-12A servo with their RP 3 LED
> type indicator installed in my instrument panel. The 1.2 inch travel of the
> T3-12A servo is just not enough movement to give me the trim travel needed
> at both ends, nose up and nose down. See here:
>
> http://www.rayallencompany.com/index.html
>
> My intended solution is to purchase and install an electrical linear
> actuator with a position indicator such as this:
>
>
> http://www.aeicomp.com/Detail.asp?Product_ID=302.390_6102TP&Product=Potentiometer+Feedback+2%22+Linear+Actuator+%28Speed+1%2F2%22+per+Sec%29+w%2F10K+Ohm+Pot++%22IP65+Rated%22
>
> My questions:
>
> Indicator Question 1: Could I possibly use the already installed Ray Allen
> LED indicator with the 10K OHM POT that this linear actuator is equipped
> with? See here:
>
> http://www.aeicomp.com/image2/AE-6102TP.pdf
>
> and here:
>
> http://www.rayallencompany.com/RACmedia/instructionsRP3.pdf
>
> Indicator Question 2: If so how would I connect the three LED indicator
> wires (orange, green (signal return), blue) to the three wires
> (white-ground, yellow-V input, blue-RS input) of the actuator?
>
> Indicator Question 3: Assuming that I cannot use the Ray Allen LED
> indicator with this linear actuator where can I obtain an indicator that
> will work with this actuator? (AEI declines to help me with this question.)
>
> Speed Control Question: The linear actuator is much faster than the Ray
> Allen actuator and I expect that I will have to slow down the linear
> actuator. What is the best way to accomplish this?
>
> Many thanks for your help.
>
> OC
>
> 'O C' Baker says "The best investment you can make is the effort to gather
> and understand information."
>
> *
>
> *
>
>
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
Message 6
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OC,
That linear actuator seems like overkill. Have you tried increasing the
chord of the trim tab? You can increase the length of the control horn and
or increase the chord of the tab and you should be able to use the servo you
have.
RAC has a trim tab travel computer that shows the movement you will get with
the different servos. Attached.
Bill B
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Owen
Baker
Sent: Monday, December 31, 2012 10:12 PM
Subject: AeroElectric-List: Indicator Help
12/31/2012
Hello Bob Nuckolls and Fellow Listers, Here is the situation:
I have a spring bias pitch trim system in my KIS TR-1 experimental amateur
built airplane. I am using a Ray Allen T3-12A servo with their RP 3 LED type
indicator installed in my instrument panel. The 1.2 inch travel of the
T3-12A servo is just not enough movement to give me the trim travel needed
at both ends, nose up and nose down. See here:
http://www.rayallencompany.com/index.html
My intended solution is to purchase and install an electrical linear
actuator with a position indicator such as this:
http://www.aeicomp.com/Detail.asp?Product_ID=302.390_6102TP
<http://www.aeicomp.com/Detail.asp?Product_ID=302.390_6102TP&Product=Potenti
ometer+Feedback+2%22+Linear+Actuator+%28Speed+1%2F2%22+per+Sec%29+w%2F10K+Oh
m+Pot++%22IP65+Rated%22>
&Product=Potentiometer+Feedback+2%22+Linear+Actuator+%28Speed+1%2F2%22+per+S
ec%29+w%2F10K+Ohm+Pot++%22IP65+Rated%22
My questions:
Indicator Question 1: Could I possibly use the already installed Ray Allen
LED indicator with the 10K OHM POT that this linear actuator is equipped
with? See here:
http://www.aeicomp.com/image2/AE-6102TP.pdf
and here:
http://www.rayallencompany.com/RACmedia/instructionsRP3.pdf
Indicator Question 2: If so how would I connect the three LED indicator
wires (orange, green (signal return), blue) to the three wires
(white-ground, yellow-V input, blue-RS input) of the actuator?
Indicator Question 3: Assuming that I cannot use the Ray Allen LED indicator
with this linear actuator where can I obtain an indicator that will work
with this actuator? (AEI declines to help me with this question.)
Speed Control Question: The linear actuator is much faster than the Ray
Allen actuator and I expect that I will have to slow down the linear
actuator. What is the best way to accomplish this?
Many thanks for your help.
OC
'O C' Baker says "The best investment you can make is the effort to gather
and understand information."
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