Today's Message Index:
----------------------
1. 10:21 AM - Transponder Antenna issue... (Andrew Meyer)
2. 10:43 AM - Re: Transponder Antenna issue... (Charlie England)
3. 10:51 AM - Re: Transponder Antenna issue... (Robert L. Nuckolls, III)
4. 10:56 AM - Re: Transponder Antenna issue... (Kent or Jackie Ashton)
5. 02:58 PM - Transponder Antenna issue... (Andrew Meyer)
6. 07:47 PM - Re: Transponder Antenna issue... (ashleysc@broadstripe.net)
Message 1
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| Subject: | Transponder Antenna issue... |
I've got a regular old ball and post transponder antenna on the belly of my
Long EZ... Someone's foot caught it and snapped it off, but I have the
part. Tried soldering it together and got it structurally sound, but it
doesn't work any more...
What's the best material to use for a replacement post?
What's the best antenna to put in a Long EZ and where? Are the tips too far
for a GTX330 to push a good signal to? What about in the nose just in front
of the battery? Too much shielding from the battery? Do I have to worry
about putting the antenna too close to pink juicy matter - is this a real
risk?
Thanks!
Message 2
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| Subject: | Re: Transponder Antenna issue... |
On 11/22/2017 12:19 PM, Andrew Meyer wrote:
> I've got a regular old ball and post transponder antenna on the belly
> of my Long EZ... Someone's foot caught it and snapped it off, but I
> have the part. Tried soldering it together and got it structurally
> sound, but it doesn't work any more...
>
> What's the best material to use for a replacement post?
>
> What's the best antenna to put in a Long EZ and where? Are the tips
> too far for a GTX330 to push a good signal to? What about in the nose
> just in front of the battery? Too much shielding from the battery? Do
> I have to worry about putting the antenna too close to pink juicy
> matter - is this a real risk?
>
> Thanks!
Aviation dept at ebay:
https://www.ebay.com/itm/TED-104-17-Aircraft-ADS-B-UAT-978-MHz-Post-Antenna/141824351182?epid=724999345&hash=item210563dbce:m:mPotFwG_HJqxr1lH285Bmgw&vxp=mtr
A 'spike' like that does need a ground plane, which you probably already
have in the EZ, if that's what was broken off (and the builder installed
it correctly). As to moving it, what are the odds of that happening again?
---
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Message 3
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| Subject: | Re: Transponder Antenna issue... |
At 12:19 PM 11/22/2017, you wrote:
>I've got a regular old ball and post transponder
>antenna on the belly of my Long EZ... Someone's
>foot caught it and snapped it off, but I have
>the part. Tried soldering it together and got it
>structurally sound, but it doesn't work any more...=C2
>
>What's the best material to use for a replacement post?
how about a new antenna . . . they're not expensive.
TED104-12 is a VERY common part available new
off of ebay
http://tinyurl.com/yd9v9g6j
>What's the best antenna to put in a Long EZ and
>where? Are the tips too far for a GTX330 to push
>a good signal to? What about in the nose just in
>front of the battery? Too much shielding from the battery?
Any place on the belly is fine. You need a ground-plane
consisting of a 5-3/4" diameter disk of aluminum.
> Do I have to worry about putting the antenna
> too close to pink juicy matter - is this a real risk?
No.
Bob . . .
Message 4
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| Subject: | Re: Transponder Antenna issue... |
> On Nov 22, 2017, at 1:19 PM, Andrew Meyer <meyerkc135@gmail.com> wrote:
>
> I've got a regular old ball and post transponder antenna on the belly of my Long
EZ... Someone's foot caught it and snapped it off, but I have the part. Tried
soldering it together and got it structurally sound, but it doesn't work any
more...
>
> What's the best material to use for a replacement post?
These $25 antennas on ebay are a pretty good deal, although you can make one out
of a brass bolt if you are really a hard-core builder. :-)
https://www.ebay.com/itm/TED-104-12-Aircraft-Transponder-DME-ADS-B-Post-Antenna/140958325304?epid=712364020&hash=item20d1c55a38:m:mPotFwG_HJqxr1lH285Bmgw&vxp=mtr
>
> What's the best antenna to put in a Long EZ and where? Are the tips too far for
a GTX330 to push a good signal to? What about in the nose just in front of
the battery? Too much shielding from the battery? Do I have to worry about putting
the antenna too close to pink juicy matter - is this a real risk?
I put them under the seat, sticking out the bottom of the fuselage. The RF is
too short to do any harm. If you put it in the nose on a pusher it will often
be blocked by the bags of water in the front seats or the engine and the radar
will lose contact climbing out from the station.
-Kent
Message 5
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| Subject: | Transponder Antenna issue... |
The other option that I'm considering is a Sim Jim antenna far up in the
nose to the left - as far past the battery as I can get it or in the right
wing root - about 4 feet to the right of the pink bag of fluid that
manipulates the controls... I do want it out of the wind because any drag
at 170 knots with only 50 or 60 HP pushing at altitude makes a BIG
difference.
https://m0ukd.com/calculators/slim-jim-and-j-pole-calculator/
Set the velocity factor at about .94 with 14 gauge solid (house) wire and
tune at 1060MHz (half way in between 1030 and 1090.) I use one of these for
my Stratux ADS-B and get 200+ mile returns from aircraft... Any thoughts on
how to do this better?
Message 6
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| Subject: | Re: Transponder Antenna issue... |
Hi Andrew;
B & C Specialty Products offers a transponder antenna (their Pt. # ANT-1) for $21.00.
I would be hard pressed to make one for that price.
Cheers! Stu.
----- Original Message -----
From: "Andrew Meyer" <meyerkc135@gmail.com>
Sent: Wednesday, November 22, 2017 10:19:44 AM
Subject: AeroElectric-List: Transponder Antenna issue...
I've got a regular old ball and post transponder antenna on the belly of my Long
EZ... Someone's foot caught it and snapped it off, but I have the part. Tried
soldering it together and got it structurally sound, but it doesn't work any
more...
What's the best material to use for a replacement post?
What's the best antenna to put in a Long EZ and where? Are the tips too far for
a GTX330 to push a good signal to? What about in the nose just in front of the
battery? Too much shielding from the battery? Do I have to worry about putting
the antenna too close to pink juicy matter - is this a real risk?
Thanks!
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