Hi, This is my second K2 build
Just got to Alignment and Test Part III and can't get RF out. Receiver tests OK Supply is 13.8V 8V regulator gives 7.59V 5V regulator gives 4.99V AGC threshold is 3.6V (highest voltage I can get) - same as first K2 built. No measurable power out - display says 0.1 W in Tune mode Indicated current: 220mA - RX 520mA - TX Indicated Voltage: 13.4V - RX 13.2V - TX 4.97V on VPWR at pin 2 of U8 with key down RF detector components and soldering checked OK Basic Voltage Checks: D6 anode goes to 240mV on TX D7 anode goes to 7.49V on TX I am having difficulty with the Mixer, Buffer, Band Pass Filter, T-R Switch and subsequent tests. I have built the RF probe and it works OK. All of the measurements for the tests above show a trace of voltage on switching to TX which then disappears. Problem in the T-R Switch or am I missing something obvious? Any help appreciated. David EI9EUB ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
