F3WT <[EMAIL PROTECTED]> made an utterence to the drakelist gang ---------------------------------------------------------------------- Thanks a lot , gentelmen , for your replies - very much appreciated .
As all my antennas ( wire - based) aren't fed barefoot but with various high -Q couplers (silvered coils, symetrical into Lecher feeder always tuning to SWR=1), this should add to the plate PI output network filtering by cleaning out any further the spectral overtones generated by the C-class operation. Shouldn' t it? ( Can in most instances tune the couplers while in reception by noise peaking only , suggesting Q is probably rather high- at least in low bands.) >From what you suggested, a seperate biais generation will probably be necessary . Now, using a ramp-up from AB2 to C class op biais when key is down and reverse when up again all in a few millisec or so should reduce clicks , right? I read abt the many warnings as you, Garey , signaled to ensure that if biais is not present, plate voltage has not to be either!! hi! This could be ensured with a relais safety circuit arrangement. Any comment and reference of past realisations or mods on this as well? thank you, 73. Pierre. F3WT le 13/02/05 17:20, Ron Wagner � [EMAIL PROTECTED] a �crit�: > The bias voltage is used in other places on the rig besides just the > finals. That said, have a look at the "drake mods" article written by > VE3EFJ http://www.dproducts.be/drake_museum/Drakemods.htm select the PDF > version and look for bias. The 5 or so hit will be the CW discussion. > > He discusses backing down the bias provided that you are only running CW. > Keep in mind that the 6JB6s are a small linear amp, and adjusting then out > of linear will effect you CW note. Might get the FCC looking your way, or > at least a few fellow ham unhappy with your key clicks. > > 73, > Ron > > On Sun, 13 Feb 2005, F3WT wrote: > >> I run only CW and would like to bias for class C operation those finals as >> I did once for my home - made CW Xmter which has a couple of 807's. > Vy 73 de Pierre. F3WT - ---------------------------------------------------------------------- On Behalf of F3WT <[EMAIL PROTECTED]> Submissions: [email protected] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ----------------------------------------------------------------------
