If you are trying to align it using a tone and looking for a flat response on the scope and you have any hum in the circuit you will never get it aligned. Hum can come from poor filter caps in the power supply or audio leads picking it up.
The best way that I have found to align phasing rigs is to talk into the mike while listening to the opposite side band and tune things for minimum (best side band suppression). A nice long ooooooh works good. You will need to switch side bands and do the same on the other as they interact. You can tune it for really great suppression on one side band while the other one won't be so great. Find the point where the suppression is nearly equal on each side band while listening to the opposite side. Sometimes the Rf phasing coil will have little effect when tuning it. It depends on how tightly it is coupled to the next stage. 73 Gary K4FMX > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:amradio- > [EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] > Sent: Tuesday, November 27, 2007 11:59 AM > To: [email protected] > Subject: [AMRadio] Halli HT37 Phasing Mod problem > > Hello, > I have been trying to get this like new HT37 on the air for awhile. > The audio phasing modulator has been near impossible to properly ballance > espeially using the manual instructions. > So far have replaced a leaky low pf brown drop silver mica > that corrected some of the problem but still am not able to get a properly > phased output from the modulator. > The audio seems ok up up to the rf stage where it won't align. The > carrier osc is on freq ok but the carrier phasing adjustments do not work > out. > Where would be a good location to apply a ballanced audio signal to > bypass most of the original circuit?. > Has anyone come up with an alignment procedure using modern test gear? > > Thanks, > Bill, > KB3DKS/1 > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
