General Frequency range ...................................................136 to 174MHz : TM-241A (M2,M3), TM-241 E(E2) 144 to 148MHz : TM-241A <K,K2,P,P2,X,M) 144 to 146MHz : TM-241 E (E,E9,EM) Mode...................................................................... F3E (FM) Antenna impedance............................................. 50C2 Power requirements............................................ 13.8V DC ± 15% (11.7 to 15.8V) Ground ................................................................... Negative Frequency stability............................................... Less than ±10ppm Current drain.........................................................Transmit mode : Less than 11A Receive mode with no signal: Less than 0.6A Operating temperature........................................-20°C to +60°C (-4°F to +140°F) Dimensions (W x H x D)...................................... 140 x 40 x 160 mm (5-1/2" x 1-37/64" x 6-19/64") Projection included.......................................... 140 x 40 x 172 mm (5-1/2" x 1-37/64" x 6-25/32") Weight.................................................................... 1.2kg (2.65lbs)