bg8ht
:XPA125通过主机传过来的波段电压来识别波段并进行切换。我不知道KX3是怎么搞的。
我翻了一下KX3的用户手册，找到了ACC2端口对功放的控制描述，要实现收发切换不是难事，下面描述的ACC2端口。
Keyline Out and GPIO (ACC2)
The 2.5-mm stereo ACC2 jack provides a keyline output (ring contact) and a general-purpose 3-volt logic signal (tip contact).
The keyline output goes low during transmit, and can be used for transmit/receive switching of linear amplifiers and transverters. For keyline voltage and current limits, see Specifications.The general-purpose signal, GPIO, can be set up for various equipment control functions. For example, it can send band-change information to Elecraft
XV-series transverters. See the ACC2 IO menu entry for a full list of uses for this signal, as well as hardware interface requirements.
波段切换则是通过固件传送代码来实现的。
