[Central-Electronics] CE-20A Power level

[Tom Elmore]

 Ron, This is interesting as I see about 11 to 12 watts out on 160 with my 20-A using a stock 458 VFO.. I will have to compare it with 80 meters and see what the power output is then. By the way I find now that 160 is open again here in Alaska I can easily work from Anchorage out to Nome.


Tom / KA1NVZ

-----Original Message-----
From: Jim Candela [mailto:jcandela at prodigy.net]
Sent: Monday, March 26, 2012 03:21 PM
To: 'Ron.K3PID', central-electronics at mailman.qth.net
Subject: Re: [Central-Electronics] CE-20A Power level

Ron, What you are seeing is typical on 80m/20M. It gets a little harder on 160 where the VFO doubles, and even harder again on 40M where the VFO triples. If the AC mains line voltage in your home was about 115 vac, then I'd expect no more that 15 watts. With 125 VAC we get more power, and a lot more heat inside the cabinet. We even push the limits of the 450 V electrolytics in the power supply during that turn on surge, and the filaments creep upward towards 7 Volts. The power is self limiting in the 20A once we have the onset of grid 1 current to the 6AG7's. The high impedance bias supply shifts more negative when the drive is high, and that limits the power. Also when you drive it hard to grid current the 9 Mhz crystal pulls a bit (maybe 50 hz). So don't spot frequency at full drive. :-)JimWD5JKO________________________________ From: Ron.K3PID To: central-electronics at mailman.qth.net Sent: Monday, March 26, 2012 5:46 PMSubject: [Central-Electronics] CE-20A Power level With careful tuning & peaking the BC-458/CE-20A show a smidgeon under 20 watts out CW key down. Does that sound about right?Ron H. K3PID______________________________________________________________Central-Electronics mailing listHome: http://mailman.qth.net/mailman/listinfo/central-electronicsHelp: http://mailman.qth.net/mmfaq.htmPost: mailto:Central-Electronics at mailman.qth.netThis list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.html______________________________________________________________Central-Electronics mailing listHome: http://mailman.qth.net/mailman/listinfo/central-electronicsHelp: http://mailman.qth.net/mmfaq.htmPost: mailto:Central-Electronics at mailman.qth.netThis list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.html