Hi Greg and thanks for your suggestions with respect to my ht20. I have not been able to check the modulator(807?) yet as I have it in a rack mount and all the rf shields are in place and you know what a bear it is to remove all those screws but I will try to get it done this week and will let you know what I find.
But thanks again and hope you are not snowed in. We in Maine have gotten nothing out of those storms. ----- Original Message ----- From: "Greg Mijal" <[email protected]> To: <[email protected]>; "Discussion of AM Radio in the Amateur Service" <[email protected]> Sent: Friday, February 12, 2010 10:44 PM Subject: Re: [AMRadio] ht20 > Could you check the modulator voltages and get back to us? > Tnx > Greg > WA7LYO > Kinsston NC > ----- Original Message ----- > From: "Larry Szendrei" <[email protected]> > To: "Discussion of AM Radio in the Amateur Service" > <[email protected]> > Sent: Friday, February 12, 2010 11:45 AM > Subject: Re: [AMRadio] ht20 > > >> Jack Schrader wrote: >>> I hope you remember me, Jack with the ht20. >>> >>> Got the ht20 hooked up and have god output in cw but not am. I hooked up >>> a >>> 100w 210v test light to the antenna output on the ht20 but when I speak >>> into >>> the mic on am the light gets dimmer not brighter. Any idea about that? >>> >>> Tnx Jack >>> >>> >> Possibilities: >> >> 1) audio out-of-phase >> 2) insufficient drive to grid of final >> 3) final not properly loaded >> 4) insufficient capacitance in filter of HV supply to final/modulators >> 5) improper impedance match in mod tranny >> >> If after checking the obvious and it still occurs, just put it on the >> air. I have one rig that does this but still sounds quite acceptable. >> You can look deeper into it later, but have some fun with it in the mean >> time... >> >> Does the modulation envelope look OK on the scope? >> >> 73, >> -Larry/NE1S >> ______________________________________________________________ >> Our Main Website: http://www.amfone.net >> AMRadio mailing list >> Searchable Archives: http://www.mail-archive.com/[email protected]/ >> List Rules (must read!): http://w5ami.net/amradiofaq.html >> List Home: http://mailman.qth.net/mailman/listinfo/amradio >> Post: [email protected] >> To unsubscribe, send an email to [email protected] 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/[email protected]/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: [email protected] > To unsubscribe, send an email to [email protected] 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 > -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.435 / Virus Database: 271.1.1/2685 - Release Date: 02/13/10 08:43:00 ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: [email protected] To unsubscribe, send an email to [email protected] 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
