27 May
2012
27 May
'12
4:39 p.m.
They are nearly identical, but the 7900 supports cross tone (different CTCSS settings on send and receive.) Dunno if Chirp knows the difference.
The manual page for split tone operation on the 7800 and 7900 look identical to me. CHIRP doesn't currently support setting those modes, although it would be trivial to add.
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Dan Smith
www.danplanet.com
KK7DS