Too many antennas!
I went with the Class 1 TXP for use at altitude and in case of the
need to ADS-B equip, but there is no GPS connected at the moment. The
TT22 operates purely as a Mode S transponder unless interrogated as Mode
C, in which case it responds as Mode C.
One GPS source possibility is the Trig TN70. But I'd want to replace
one GPS antenna with the Trig and divide the signal, as there's no room
for another antenna with proper separation. The present system uses two
GPS antennas to drive 4 receivers using a MECA 3-way divider for one
antenna, in use for two years now.
Just spoke with a tech at Trig in Scotland. As it's a newish product
he is passing the questions about dividers on to someone more familiar
with the TN70 and its certification. Also sent a question to Aircraft
Spruce, so they will put the response on their website. Gave Trig and
Spruce the MECA 802-6-1.700V divider as an example. Added that the
aircraft is an N-registered Experimental glider.
For those unfamiliar with divider use: The Trig GPS antenna would
connect to the divider. A short TNC-TNC cable would connect one divider
output to the TN70. The second output would use a short TNC to SMA, SMC
or MCX cable depending on which GPS receiver was connected.
Since there is nothing in the TN70 spec about antenna voltage,
possibly the second GPS unit on the TNC divider will require a DC
blocker to prevent over-voltage at the antenna. My other divider uses a
12v active GPS antenna so that isn't necessary. Any or all of those GPS
receivers can power the antenna.
You may be able to find things locally, but below are my sources.
Jim
TN70
https://www.trig-avionics.com/library/TN70-001385-00-AA.pdf
2-way TNC divider
http://www.e-meca.com/power-divider-combiners/tnc-female/802-6-1-700v
3-way SMA divider
http://www.e-meca.com/power-divider-combiners/3-way-sma-female/803-2-1-500v
SMA DC blocker
http://www.mouser.com/ds/2/94/CBLK-300-3-48169.pdf
12v GPS antenna
http://www.mouser.com/ds/2/238/ANT-GPS-SH-xxx_Data_Sheet-15590.pdf
------ Original Message ------
From: "Mark Newton" <[email protected]>
To: "Jim Staniforth" <[email protected]>; "Discussion of issues
relating to Soaring in Australia." <[email protected]>
Sent: 2/22/2017 10:55:02 PM
Subject: Re: [Aus-soaring] To PowerFlarm or not?
On Feb 23, 2017, at 10:37 AM, Jim Staniforth <[email protected]>
wrote:
Seems to me that Trig transponders are the easiest to install and
keep certified. I've installed two TT21s and the current TT22, also a
couple of Becker 4401s. Removed a Garmin and a couple of Terra(ble)s.
What are you using as a position source to get ADS-B out of the Trigs?
- mark
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