The issue is the dielectric on low frequency, a doorknob capacitor can stand 3 amps on 3.5MHz. but only 1 amp or less on 1.8 MHz. Because of the high loss on 1.8 MHz the capacitor get hot, than if it
Hi Bill This site is in German but google chrome translate it nicely. It is the most complete iformation with pictute I found about the HP PS. http://translate.googleusercontent.com/translate_c?depth
Hi guys Sometimes I was able to find a better price on toroid's here http://www.cwsbytemark.com/index.php?main_page=index&cPath=215 Cheers JC N4IS Chris, Buy Fair-rite toroids from mouser.co.uk (post
I think my 813 worked 20years with 3500V 800W out on a single tube, ground grid amplifier. The graphite plate got orange to yellow in few seconds any time ptt was on and back to graphite color few se
Hi Peter PI network loss is related with the Q of the inductor, you need material #2 or #6 ( better stability with temperature), #61 #77 are good for BALUN or chokes and not good for inductors with h
Mark You can use CERA-MITE NPO, the max I was able to find was 170 PF, Its available at DIGIKEY, or parallel 62pf CERA-MITE - 564CC0GAA302EL620J - Capacitor, ceramic. 62pF 3,000V. $US 1.00 https://ww
Rob You are right the current at 1.8 MHz is the issue. Check the current rate for doorknob capacitor, like HT50 page 11, blue line. http://www.highenergycorp.com/High%20Energy%20Corp.%20Ceramic%20Cap
That is a catch 22. The NEC for residence is not the same for a Radio Station, and R56 - Standards and Guidelines for Communication Sites. However we have a residence and a Radio Station on the same
Whats a catch 22? You need to connect the Amp chassis to the AC neutral (wire connected to the ground at the AC entrance), and you need to connect the Amp chassis to the ground of the station, at sam