The Trig TN72 is another option for GPS source, especially for
Experimentals. A TN72 and TA70 antenna together will be 1/3 of the cost
of a TN70 when it is available.
Technically, the TT21 Class 2 is only "legal Mode-S" here to 15,000'.
You may have seen a video on Taylors gliding page of a thermal to
17,999' in my glider. Believe there is nothing in the Mode-S string that
indicates Class 1 or 2, but the difference in price is only US $250.
With SLA batteries I tried to keep current draw down and the TT21 is
less power hungry than other transponders. With LiFePO4s, battery
capacity is not an issue.
Jim
Trig stuff at Craggy Aero:
http://craggyaero.com/trig.htm
------ Original Message ------
From: "Mark Newton" <[email protected]>
To: "Jim Staniforth" <[email protected]>
Cc: "Discussion of issues relating to Soaring in Australia."
<[email protected]>
Sent: 2/23/2017 12:38:12 PM
Subject: Re: [Aus-soaring] To PowerFlarm or not?
On 24 Feb 2017, at 5:16 AM, Jim Staniforth <[email protected]>
wrote:
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.
Y’ok, mode-S without ADS-B then. Meets expectations.
One GPS source possibility is the Trig TN70.
TN70 looks interesting. $3k for a GPS feels offensive, though :)
Added that the aircraft is an N-registered Experimental glider.
… aaaaand that explains why you went for the TT22 instead of the TT21,
I take it? The US mandate requires a class 1 transponder.
AFAICT the only difference between class 1 and class 2 is transmit
signal strength, and Australia’s regs specify no preference for one or
the other, so I saved $500 and got a TT21 instead :-)
- mark
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