I guess the "more is better statement" is strictly a personal preference. What I should have said is "If you want the audio waveform to not be modified by the output circuitry then more is better". Having to little capacitance will modify the audio wave form and can shift the phase of lower frequencies for instance if a 200 cps note and a 400 cps mote or together and appear as natural harmonic causing certain peaks of a non sinusoidal wave to go positive then the shifting of the phase relationship between these two frequencies may cause a repositioning of the peaks and there by cause the loss of the peaks. This can sound better. I guess for some, better sound is not always the natural sound. It can even shift it so that the peaks go negative. This is also done with certain settings of tonal control circuitry.
73,John, WA5BXO -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brett Gazdzinski Sent: Tuesday, November 25, 2003 6:57 AM To: [email protected] Subject: RE: [AMRadio] Re: Modulation transformer ID and repair I went out an bought a 50 henery choke from Peter Dahl. It cost $200.00 I think, but is very nice. It works fine at 2000 volts and 400 ma on the 813 rig. I noticed that playing with the cap value changed the sound of the transmitter quite a bit, more is not always better. I cant say removing the current from the cvm5 seemed to help the sound of the rig much. Maybe the cvm5 is not so bad to start with... Brett N2DTS > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Geoff/W5OMR > Sent: Tuesday, November 25, 2003 7:38 AM > To: [email protected] > Subject: Re: [AMRadio] Re: Modulation transformer ID and repair > > > > > > > Yow! > > > > 3000VDC @ 300mA = 10,000 ohms. (This is where the transmitter lives > > according to the notes I have on it) > > > perhaps thats what it's capable of, but you're not going to > run it there are ya? > > Come up with a more realistic power level, and go from there. > For that > matter, 60 Hy will probably do you nicely, as long as the > iron can handle > series current through them. > > > 10,000 ohms = 80H @ 200 Hz > > I ran 2000V at 250mA for the longest time, with only 40Hy of > choke, and > never had a problem. the highest rating of current thrugh > one of the chokes > was 275mA (whiich is why I stayed down around 250mA - besides, 500w > DC input is ~around~ 350~375w of carrier out... but, man the > positive peaks > I had then... (http://www.qsl.net/wa5bxo/asyam/aam3.html) > > > And I suppose I had better avoid swinging chokes here too. > > > > Anyone have a suitable reactor for sale? I have a couple of > 10's, but > > obviously this would not be near enough. > > > > I guess the main point in putting reactors in series would > be to place > > the highest voltage-rated one at the modulated voltage point. > > Voltage? No... Current? THAT's what carries the mail! > > 73 = Best Regards, > -Geoff/W5OMR > > > _______________________________________________ > AMRadio mailing list > [email protected] > http://mailman.qth.net/mailman/listinfo/amradio _______________________________________________ AMRadio mailing list [email protected] http://mailman.qth.net/mailman/listinfo/amradio
