Hi Chris - I built a linear PA for 136 kHz (I wanted it linear so as to run PSK31). It uses four bipolar output transistors (two MJ15003 and two MJ15004) in complement ary parallel/push-pull class AB
Hi Chris - I built a linear PA for 136 kHz (I wanted it linear so as to run PSK31). It uses four bipolar output transistors (two MJ15003 and two MJ15004) in complement ary parallel/push-pull class AB
Chris Had a look around Wikipedia , re phase , -3 db , margins , that sort of thing ..as for removing bits ... would not be the first person to run into allsorts of problems getting a (137k ) amp to
Hello friends! I use AF amp Hafler on 137kHz and it works without problems. W1WD inspired me, so I bought Hafler P3000 via e-bay in USA. But it is true, that I have never trayed to use other typ than
Hi All, Just started constructing TX for 136kHz, noticed Maplin do a Velleman audio PA kit that is rated at 200W (100W RMS into 4R). OK there's no mains transformer or heat sink, but reckon it's good
