I've got a fairly wide-spaced 500 pF air variable for the tuning cap so no more should be needed there.
For the loading side, I've gathered some "transmitting" caps of 1000 pF each, 5kV to 8 kV rating, to go in parallel with either a 1000 pF vacuum variable (with motor drive!) or another one of the 500 pF air variables. Steve WD8DAS sbjohns...@aol.com http://www.wd8das.net/ --------------------------------------------------------- Radio is your best entertainment value. --------------------------------------------------------- -----Original Message----- From: Edward Swynar <gswy...@durham.net> To: Discussion of AM Radio in the Amateur Service <amradio@mailman.qth.net>; glowb...@piobaire.mines.uidaho.edu; sbjohns...@aol.com Cc: amradio@mailman.qth.net Sent: Fri, 1 May 2009 12:23 pm Subject: Re: [AMRadio] Filament choke Hi Steve, What kinda fixed padder capacitors are you placing in parallel with that plate tuning capacitor, as well as the plate loading cap, in the final pi-tank...? I'm sure you're already well aware of it, but you've gotta be REAL PICKY in these applications, as I discovered here the hard way...! Hi Hi. ~73~ Eddy VE3CUI - VE3XZ ************************************* ----- Original Message ----- From: <sbjohns...@aol.com> To: <glowb...@piobaire.mines.uidaho.edu> Cc: <amradio@mailman.qth.net> Sent: Thursday, April 30, 2009 9:36 AM Subject: Re: [AMRadio] Filament choke > > Here's my schematic so far for the 160m amp: > > http://www.wd8das.net/160m-GI7B.JPG > > This one won't be a as pretty as some... I'm going to build it on a > steel chassis that has been used by others for at least four other > projects and is literally swiss-cheesed with useful holes. (more holes > than steel maybe) > > The front panel is 1/8" aluminum sheet also somewhat holey, but > smoothed and now painted nicely with textured gray. The cabinet looks > like it came from a later-vintage Meissner Signal Shifter with liftable > lid and plenty of ventilation holes. > > Steve WD8DAS > > sbjohns...@aol.com > http://www.wd8das.net/ > --------------------------------------------------------- > Radio is your best entertainment value. > --------------------------------------------------------- > > > > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: AMRadio@mailman.qth.net > To unsubscribe, send an email to amradio-requ...@mailman.qth.net with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
