On 27 Feb 2017, at 9:06 PM, Peter (PCS3) <[email protected]> wrote: > > I purchased a TT21 and it did not include an altitude encoder for Mode S: had > to purchase and install it afterwards. :-( > Was not advised by the salesperson of the TT21. :-( >
Huh? It’s built-in to the TC20 display module that bolts into the instrument panel, which comes in the box with the transponder: https://www.trig-avionics.com/products/tt21/ <https://www.trig-avionics.com/products/tt21/> TT21 gets mounted on a sliding tray behind a bulkhead or under the panel somewhere, cabled to the TC20 in your panel, which also takes an input from your static system. Are you sure it was a TT21 you bought? I don’t think you can buy them without the encoder. (although you can configure them to use an external encoder if you have one, hilariously enough) - mark
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