I hooked my SBitx up to my current limited 12 V supply and at 5 watts output (confirmed on an external meter), the unit is drawing close to 6 amps. That¡¯s 72 watts input for 5 out. Is this normal? On receive, it¡¯s around 600 mA or about 7 watts, that¡¯s still 65 watts extra for 5 watts out.
Mark Erbaugh