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naumuk(at)alltel.net
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 Posted: Tue Sep 30, 2008 3:59 pm Post subject: Altitude encoder |
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All-
Do I need an altitude encoder with a mode C transponder, or is that an option?
Bill Naumuk
Townville, Pa.
HDS 601MG/Corvair 95%
[quote][b]
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tshankland(at)sbcglobal.n
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| Posted: Tue Sep 30, 2008 4:35 pm Post subject: Altitude encoder |
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Bill,
If you want your mode C transponder to provide altitude information you will need some type of alttitude encoder.
Tim Shankland
601HD N706TS
Bill Naumuk wrote:
[quote] All-
Do I need an altitude encoder with a mode C transponder, or is that an option?
Bill Naumuk
Townville, Pa.
HDS 601MG/Corvair 95%
[b]
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craig(at)craigandjean.com
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| Posted: Tue Sep 30, 2008 4:36 pm Post subject: Altitude encoder |
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Yes you need an encoded but your Dynon D100 can do the job. If your transponder works with serial encoders then all you need are some wires. If it only accept parallel the you need to buy a little box from Dynon – still cheaper than an encoded.
http://www.dynonavionics.com/downloads/Install_Guides/EFIS-D100%20Installation%20Guide.pdf, page 18, “Altitude Encoder Wiring”
Which transponder do you have?
-- Craig
From: owner-zenith-list-server(at)matronics.com [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of Bill Naumuk
Sent: Tuesday, September 30, 2008 5:58 PM
To: zenith list
Subject: Altitude encoder
All-
Do I need an altitude encoder with a mode C transponder, or is that an option?
Bill Naumuk
Townville, Pa.
HDS 601MG/Corvair 95%
| Quote: | | http://www.matronics.com/Navigator?Zenith-List |
0123456789
[quote][b]
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psm(at)att.net
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| Posted: Tue Sep 30, 2008 4:36 pm Post subject: Altitude encoder |
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Hi Bill,
The transponder only transmits the altitude information. Altitude information must be provided by an external device of some sort.
The old fashioned way to get the altitude is with a blind encoder device. This is not a sensitive altimeter,so there is a dance you must do with ATC. Each time you talk to a controller for the first time you must tell him your altitude. That lets him calibrate his eyeball to adjust your blind encoder report on his radar screen to your sensitive altimeter report.
For most of us these days, the Dynon or other EFIS device will supply altitude information to the transponder. In this case the altitude reported is correct. Still, you must do the dance with ATC. After all, they don't know you have modern equipment on your plane.
Good luck,
Paul
XL getting close
At 04:58 PM 9/30/2008, you wrote:
[quote]All-
Do I need an altitude encoder with a mode C transponder, or is that an option?
Bill Naumuk
Townville, Pa.
HDS 601MG/Corvair 95%
[b]
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ideaz1(at)sbcglobal.net
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| Posted: Tue Sep 30, 2008 4:37 pm Post subject: Altitude encoder |
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Yes, if you want to operate in class B & C? airspace. You can get one from A.S. for about $150.
Dirk
[quote] ---
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Tue Sep 30, 2008 4:46 pm Post subject: Altitude encoder |
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The mode A function should work fine without the encoder, you just won't have the mode C altitude reporting function available.
On Sep 30, 2008, at 7:58 PM, Bill Naumuk wrote:
| Quote: | All-
Do I need an altitude encoder with a mode C transponder, or is that an option?
Bill Naumuk
Townville, Pa.
HDS 601MG/Corvair 95%
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--
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
do not archive.
[quote][b]
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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive. |
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naumuk(at)alltel.net
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| Posted: Tue Sep 30, 2008 4:48 pm Post subject: Altitude encoder |
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Craig-
I'm looking at, but haven't bought a Bendix TR661A w/encoder, but no tray. The price is reasonable enough, and I figure I could build a tray. Since Dave Clay turned me on to Used Avionics.com, there are a multitude of choices.
Decisions, decisions!
Bill
[quote] ---
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ideaz1(at)sbcglobal.net
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| Posted: Tue Sep 30, 2008 5:03 pm Post subject: Altitude encoder |
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If you give ATC your GPS altitude chances are it will be wrong. They will invariably give you the baro pressure to set your altimiter and your blind encoder if correct will match with this setting. I found out the hard (embarassing) way by setting my altimeter to my GPS and found out it was off by over 500 feet. ATC doesn't care about your actual altitude, they just want everyone on the same page (their page).
Dirk
[quote] ---
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craig(at)craigandjean.com
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| Posted: Tue Sep 30, 2008 5:44 pm Post subject: Altitude encoder |
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At least for my Garmin 327 transponder the tray is fairly fancy. The tray contains mating connectors for the power/data and the antenna connectors. The alignment is good enough that the transponder slides in and the connectors mate. This would be important in a packed panel where you didn’t have access to the rear of the panel. But I doubt your panel is that elaborate and you may be building access panels to the rear of the panel into your glare shield as many builders have. Hopefully you are getting a discount due to the missing tray.
I can’t find any manuals for the Bendix TR661A but I bet it is old enough that it only offers parallel output. Chief Aircraft lists the Dynon converter box (Dynon p/n 362-000) at $80 so factor that into your calculations. But if the one you are looking at includes an encoder then you could just plumb the included encoder into your static system and have one more box behind you panel. On the other hand if the price of the encoder is hidden in the price of the used transponder it may be cheaper to by a transponder without the encoder and just spend the $80 on the Dynon converter box.
In older transponders the transmitters are tube-based. With a used transponder you don’t know how much life is left in the tube and replacements are expensive. The newer ones are solid-state. You get what you pay for (or at least you don’t get what you don’t pay for). The cheapest new solid-state transponder I could find is Narco single-display AT165/VS. Spruce quotes it at $1335.
-- Craig
From: owner-zenith-list-server(at)matronics.com [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of Bill Naumuk
Sent: Tuesday, September 30, 2008 6:48 PM
To: zenith-list(at)matronics.com
Subject: Re: Altitude encoder
Craig-
I'm looking at, but haven't bought a Bendix TR661A w/encoder, but no tray. The price is reasonable enough, and I figure I could build a tray. Since Dave Clay turned me on to Used Avionics.com, there are a multitude of choices.
Decisions, decisions!
Bill
| Quote: |
----- Original Message -----
From: Craig Payne (craig(at)craigandjean.com)
To: zenith-list(at)matronics.com (zenith-list(at)matronics.com)
Sent: Tuesday, September 30, 2008 8:34 PM
Subject: RE: Zenith-List: Altitude encoder
Yes you need an encoded but your Dynon D100 can do the job. If your transponder works with serial encoders then all you need are some wires. If it only accept parallel the you need to buy a little box from Dynon – still cheaper than an encoded.
http://www.dynonavionics.com/downloads/Install_Guides/EFIS-D100%20Installation%20Guide.pdf, page 18, “Altitude Encoder Wiring”
Which transponder do you have?
-- Craig
From: owner-zenith-list-server(at)matronics.com [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of Bill Naumuk
Sent: Tuesday, September 30, 2008 5:58 PM
To: zenith list
Subject: Altitude encoder
All-
Do I need an altitude encoder with a mode C transponder, or is that an option?
Bill Naumuk
Townville, Pa.
HDS 601MG/Corvair 95%
| Quote: | | http://www.matronics.com/Navigator?Zenith-Listhttp://forums.matronics.comhttp://www.matronics.com/contribution href="http://www.matronics.com/Navigator?Zenith-List">http://www.matronhref="http://forums.matronics.com">http://forums.matronics.comhref="http://www.matronics.com/contribution">http://www.matronics.com/c |
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[quote][b]
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craig(at)craigandjean.com
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| Posted: Tue Sep 30, 2008 7:10 pm Post subject: Altitude encoder |
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One other point – if you don’t get the tray you may not get the multi-contact data connector that mates to the back of the transponder. It may be a hassle tracking down the right connector.
-- Craig
From: owner-zenith-list-server(at)matronics.com [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of Bill Naumuk
Sent: Tuesday, September 30, 2008 6:48 PM
To: zenith-list(at)matronics.com
Subject: Re: Altitude encoder
Craig-
I'm looking at, but haven't bought a Bendix TR661A w/encoder, but no tray. The price is reasonable enough, and I figure I could build a tray. Since Dave Clay turned me on to Used Avionics.com, there are a multitude of choices.
Decisions, decisions!
Bill
| Quote: |
----- Original Message -----
From: Craig Payne (craig(at)craigandjean.com)
To: zenith-list(at)matronics.com (zenith-list(at)matronics.com)
Sent: Tuesday, September 30, 2008 8:34 PM
Subject: RE: Zenith-List: Altitude encoder
Yes you need an encoded but your Dynon D100 can do the job. If your transponder works with serial encoders then all you need are some wires. If it only accept parallel the you need to buy a little box from Dynon – still cheaper than an encoded.
http://www.dynonavionics.com/downloads/Install_Guides/EFIS-D100%20Installation%20Guide.pdf, page 18, “Altitude Encoder Wiring”
Which transponder do you have?
-- Craig
From: owner-zenith-list-server(at)matronics.com [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of Bill Naumuk
Sent: Tuesday, September 30, 2008 5:58 PM
To: zenith list
Subject: Altitude encoder
All-
Do I need an altitude encoder with a mode C transponder, or is that an option?
Bill Naumuk
Townville, Pa.
HDS 601MG/Corvair 95%
| Quote: | | http://www.matronics.com/Navigator?Zenith-Listhttp://forums.matronics.comhttp://www.matronics.com/contribution href="http://www.matronics.com/Navigator?Zenith-List">http://www.matronhref="http://forums.matronics.com">http://forums.matronics.comhref="http://www.matronics.com/contribution">http://www.matronics.com/c |
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