tag:blogger.com,1999:blog-2285391576429582736.post599781444169905713..comments2024-03-22T05:25:30.571-07:00Comments on Ron's Radio Corner : BFG591, ATV amplifier for 1.2 GHzPA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-2285391576429582736.post-39072786244233368692021-12-27T13:29:52.185-08:002021-12-27T13:29:52.185-08:00Hi Ron!
Thank you for great blog!
I'm trying...Hi Ron!<br /><br />Thank you for great blog!<br /><br />I'm trying to understand and design RF circuits, and found this for a study.<br /><br />I'm designing and learning to calculate similar for lower frequency and I'm wondering about maximum values of transistor.<br /><br />For BFG591 maximum collector-emitter voltage is 15V; Is it possible voltage at collector exceeds this on your circuit due voltage swing over L4?<br /><br />(I'm trying to find out should I drive transistor from lower source voltage like 7.5v to prevent it get damaged)<br /><br />Best regards olvinjanoisinAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-2285391576429582736.post-56928258495255993482014-03-19T23:41:35.656-07:002014-03-19T23:41:35.656-07:00Hi Anders, thank you for your nice reply. In fact ...Hi Anders, thank you for your nice reply. In fact there are two pi-filters (C-L-C). One on input and one on the output side. You are correct; Main purpose is the match of impedance. 73 RonPA2RFhttps://www.blogger.com/profile/14639959863827712083noreply@blogger.comtag:blogger.com,1999:blog-2285391576429582736.post-65042899547106227162014-03-19T05:28:03.246-07:002014-03-19T05:28:03.246-07:00Ron,
Thank you for posting the nice schematic of ...Ron,<br /><br />Thank you for posting the nice schematic of the 200 mW amp. I am just starting out in building RF-circuits, and I have a question in that regard. I understand most of the circuit design except the placement of the 5p trimmer caps in front- and at the end of the microstrips L1 and L2. What is their purpose? djusting the specific impedance of the microstrips? Inpu/utput impedance matching maybe?<br /><br />Thanks in advance!<br /><br />Best regards<br /><br />Anders Grinrød, NorwayAnonymoushttps://www.blogger.com/profile/06529221002627297867noreply@blogger.com