73s to all, for those of us who have AM like an not cured germ in their blood.Dedicated to all of them.A 3 stages AM rig.The shielded 6J5 is the oscillator tube.It's working in a Hartley type V.F.O with a coil @ 4mHs and enough variable capacitance to make the tube oscillating in various H.F bands i believe.Good air cooled mounted the entire V.F.O on a copper board in order to avert temperatures due to tube's heating which changes the components values of this v.f.o. An 6CA7/EL34 is the buffer/driver stage.At least that driver tube it's grid driving a pair of "twins".2X811s @ 1200v on plates. The 2 output tubes will be plate modulated by a pair of sweep tubes 2XEL504s @ 100Watts output pwr. Enjoy it! Chris SV1DAF. Mni tnx to Jim for the link and space left in his web space. ----- Original Message ----- From: "Jim candela" <[EMAIL PROTECTED]> To: "CHRIS PAPAIOANNOU" <[EMAIL PROTECTED]> Sent: Monday, January 10, 2005 3:54 AM Subject: RE: [AMRadio] 813 tx
> > Chris, > > Your pictures are on the web at the following link: > > http://pages.prodigy.net/jcandela/SV1DAF/ > > > Regards, > Jim > > -----Original Message----- > From: CHRIS PAPAIOANNOU [mailto:[EMAIL PROTECTED] > Sent: Sunday, January 09, 2005 9:32 AM > To: Jim candela > Subject: Re: [AMRadio] 813 tx > > > o.k Jim, > i'm gonna take a couple of pics wright now and then get back to you.. > Chris. > ----- Original Message ----- > From: "Jim candela" <[EMAIL PROTECTED]> > To: "CHRIS PAPAIOANNOU" <[EMAIL PROTECTED]> > Sent: Sunday, January 09, 2005 5:19 PM > Subject: RE: [AMRadio] 813 tx > > > > > > I am not sure. You can however send them to me, and I'll post them on my > > internet space, and return to you the http:// link, so you can write about > > your newest creation. > > > > -----Original Message----- > > From: CHRIS PAPAIOANNOU [mailto:[EMAIL PROTECTED] > > Sent: Sunday, January 09, 2005 9:00 AM > > To: Jim candela > > Subject: Re: [AMRadio] 813 tx > > > > > > Jim, > > is that possible to send them to [EMAIL PROTECTED] > > Will be accepted or rejected? > > Chris SV1DAF. > > ----- Original Message ----- > > From: "Jim candela" <[EMAIL PROTECTED]> > > To: "CHRIS PAPAIOANNOU" <[EMAIL PROTECTED]> > > Sent: Sunday, January 09, 2005 3:25 PM > > Subject: RE: [AMRadio] 813 tx > > > > > > > > > > Chris, > > > > > > I would like to see those pictures, schematic, etc. Can you upload > > > those to the net somewhere, and then share the link with the group? > > > Keep up the good work! > > > > > > Regards, > > > Jim > > > > > > -----Original Message----- > > > From: CHRIS PAPAIOANNOU [mailto:[EMAIL PROTECTED] > > > Sent: Sunday, January 09, 2005 12:44 AM > > > To: [EMAIL PROTECTED] > > > Subject: Re: [AMRadio] 813 tx > > > > > > > > > Happy 2005 Jim to u & urs there! > > > i recently finished my homemade 3 stages AM rig.6J5-EL34/6CA7-2X811s > plate > > > modulated by a pair of EL504s sweep tubes. > > > would you like to send you some pics,subject of discussion on the list > > also? > > > 73, > > > Chris SV1DAF. > > > ----- Original Message ----- > > > From: "Jim candela" <[EMAIL PROTECTED]> > > > To: "Discussion of AM Radio" <[email protected]> > > > Sent: Sunday, October 31, 2004 11:21 PM > > > Subject: RE: [AMRadio] 813 tx > > > > > > > > > > > > > > > > > > Chris, > > > > > > > > I cannot operate my ham rig late at night because of today's > > speakers > > > on > > > > computers, and surround sound movie rooms. The advent of THX, Dolby > > > digital > > > > 5.1, has brought a new problem to hams. All those satellite speakers > > with > > > > built in amplifiers are a nuisance to us all. I had a neighbor with a > > > $2000 > > > > set of speakers. These would fire up and talk whenever I was on the > air. > > > So > > > > late at night ham activity kept my neighbor awake. He even tried > > > > disconnecting the speakers, and wrapped the wire around the case. My > > voice > > > > still came out. It was like on the three stooges where the medical > > > intercom > > > > would call out, "calling Dr.'s Larry, Mo, and Curly".. > > > > > > > > That AM rig in the dorm was 30 years ago. I do recall getting RF burns > > off > > > > the window frame! No good ground at the third level of the building, > > > except > > > > for maybe the radiator pipes, widow frame, and cold water pipe. I > think > > I > > > > just tied the radiator pipe to the rig as a ground to go with the > window > > > > frame. > > > > > > > > I too use vinyl LP's and a old Marantz turntable. I use a reworked > > > Sherwood > > > > tube amplifier with a combined FM tuner. That is another story. Here > is > > a > > > > piece of that: > > > > > > > > http://pages.prodigy.net/jcandela/Sherwood_S8000/HV_REG/regulator.htm > > > > > > > > Regards, > > > > Jim > > > > > > > > > > > > > > > > -----Original Message----- > > > > From: [EMAIL PROTECTED] > > > > [mailto:[EMAIL PROTECTED] Behalf Of CHRIS PAPAIOANNOU > > > > Sent: Sunday, October 31, 2004 12:40 PM > > > > To: Discussion of AM Radio > > > > Subject: Re: [AMRadio] 813 tx > > > > > > > > > > > > Jim, > > > > I don't think that this bulb dummy load radiated RF far away...but > > > > sufficiently far away to provoke the neighbors around to start coming > > > by...a > > > > test once proved me that with a dummy load my modulation has been > heard > > > no > > > > more than about 195 feet.Didn't check out if this distance was more > than > > > 195 > > > > feet because an other fellow ham who was in his house heard me and > this > > > test > > > > ended at this point,because this was the object.But since i believe > that > > > > antennas with regular electrical length depending of the frequency are > > > > exactly the opposite of a dummy load i guess that this distance > > couldn't > > > > be a little bit more than these 195 feet. > > > > Regarding that Lear T30 seems that the aluminium window frame was a > very > > > > poor counterpoise..did you use at that time any form of rf ground? > > > > I've experienced in the past TVi problems with tube AM rigs due to > poor > > rf > > > > grounds..you can immagine my ma's face when was coming to tell me that > > was > > > > listening to a strange voice in the tv,something like cat's mew.Then > > > learned > > > > that this was me. > > > > Fortunatelly i never had problems with the neighbors.Generally these > > > > transmissions were midnight transmissions when the most of them were > on > > > bed. > > > > FM?My 1st homebrew rig was a 6BQ5 rig.Self oscillated (COLPITS > type).I > > > was > > > > using an FM receiver when trying to tune it.Had homebrewd a > 6AK5(5654W) > > > self > > > > oscillated also.With dipoles on the roof made from aluminium pipe.I > > > remember > > > > that had connected 2 transfrmrs with primaries 220V and secondaries > > > 6,3V/2A > > > > secondary to secondary in order to feed the rigs.In this way had no > > > > confluences beetween rf and feeding and no hum. > > > > Vinyl?I don't need to remember it Jim cause even now i still use my > old > > > > records..The others here are using digi media.I don't.My amp and tuner > > are > > > > tube type also.By the others i mean the members of my family. > > > > I really enjoyed your memories and experiences Jim, > > > > Regards, > > > > Chris,SV1DAF. > > > > ----- Original Message ----- > > > > From: "Jim candela" <[EMAIL PROTECTED]> > > > > To: "Discussion of AM Radio" <[email protected]> > > > > Sent: Sunday, October 31, 2004 3:17 PM > > > > Subject: RE: [AMRadio] 813 tx > > > > > > > > > > > > > > > > > > > > > > > Chris, You mentioned broadcasting music to entertain an audience. If > > the > > > > > truth be known, some of us on this reflector may have at one time or > > > > another > > > > > done this. I can only speak for myself however. :) > > > > > > > > > > I once had a kilowatt AM rig where with 1000 watts DC input I got > 850 > > > > watts > > > > > carrier output (about 1983). On a particular Saturday night I > > installed > > > a > > > > > 600 watt movie projector bulb as a "dummy" load at the top of my 40 > > foot > > > > > tower. The rig loaded really nicely into that bulb. Wanting to see > how > > > it > > > > > looked with modulation I needed a modulation source to modulate the > > rig > > > > > while I was outside looking at the light. So my first CD player was > > put > > > to > > > > > use playing some Beatles music. It was amazing how bright that bulb > > was, > > > > and > > > > > how much neighborhood illumination resulted. I had to quit when the > > > > > neighbors started coming by... I wonder how far that thing radiated > > > RF.... > > > > > > > > > > About 10 years earlier when I was a freshman in college, I set up a > 80 > > > > meter > > > > > ham station in my dorm room. For an antenna I used a 10' whip out > the > > > > window > > > > > with a loading coil, and the aluminum window frame was my > > counterpoise. > > > I > > > > > did work a few hams on AM using my Lear T30 transmitter (4 - 6L6's + > > > 6SN7, > > > > > and 6SJ7). I was received more by the dorm inhabitants on their TV > > sets > > > > and > > > > > stereo amplifiers however. They shut me down. About this time I was > > > > > experimenting with transistors. With a simple transistor gain tester > I > > > > > noticed that the readings would vary when moving the leads of the > > > > transistor > > > > > tester. I had several computer boards, and some of these early > silicon > > > > > transistors made excellent VHF oscillators. I conjured up a two > > > transistor > > > > > 100 Mhz transmitter (MO and PA), and amplitude modulated the > > oscillator. > > > > The > > > > > amplifier was class C, so most of the AM was gone, and FM was the > > > dominate > > > > > modulation. Listening to this on a quality FM receiver startled me > > when > > > I > > > > > discovered that the quality was excellent. I guess that we had maybe > > 100 > > > > mw > > > > > RF output, and with a dipole on the roof of a 3 story building, this > > > thing > > > > > really got out good. This was the beginning of WRFP, Radio Free > > > > Puterbaugh. > > > > > Every Friday and Saturday night we had a dorm sponsored radio > station > > > with > > > > > full campus coverage. Requests would come into the front desk, and > > with > > > > > dozens of students making their LP's available (remember vinyl?), we > > had > > > a > > > > > full fledged radio station with pre-recorded commercials. So what > > > started > > > > > out as a ham with a TVI and RFI problem turned into a full fledged > > radio > > > > > station. The same folk that were mad at me were now actively working > > on > > > > the > > > > > broadcasting! We did this for several months before the novelty wore > > > off. > > > > > > > > > > Regards, > > > > > Jim > > > > > > > > > > -----Original Message----- > > > > > From: [EMAIL PROTECTED] > > > > > [mailto:[EMAIL PROTECTED] Behalf Of CHRIS > PAPAIOANNOU > > > > > Sent: Thursday, October 28, 2004 12:36 PM > > > > > To: Discussion of AM Radio > > > > > Cc: [EMAIL PROTECTED] > > > > > Subject: Re: [AMRadio] 813 tx > > > > > > > > > > > > > > > Legendary tube!About 20-25 yrs ago saw a rack mount homebrew 813 rig > > in > > > a > > > > > fellow's house..p.s and tx in different pi aluminium chassis one > above > > > the > > > > > other...6L6 the oscillator tube,an 807 like buffer and 2 of those > 813 > > > > > "babes"in parallel like p.a > > > > > The p.a tubes were fed with 1200V on plate,was using an 100 W > > > > > modulator-amp,and had a long wire about 300 feet long... > > > > > I still remember it after all this time gone.. > > > > > Btw saw a ham from AZ today morning while was searching in the > intrnet > > > who > > > > > has used the tube self-oscillated.A well homebrew rig..and a > surprise > > > for > > > > me > > > > > who have never seen this tube working in this way be4. > > > > > 73,Chris,SV1DAF. > > > > > ----- Original Message ----- > > > > > From: "George Pritchard" <[EMAIL PROTECTED]> > > > > > To: "'Discussion of AM Radio'" <[email protected]> > > > > > Sent: Thursday, October 28, 2004 5:45 PM > > > > > Subject: RE: [AMRadio] 813 tx > > > > > > > > > > > > > > > > I had one of those rigs as a kid BEFORE I WAS A HAM. I used it on > CB > > > > > > modulated with 811A's. Then I found out about Amateur Radio. A > > > backwards > > > > > > experience. Years later I parted it out, unknowing it was so well > > > > > > documented. I actually traced that thing out and drew the > schematic > > at > > > > 16 > > > > > > years old. The rig sat at the high school in a corner for years... > > The > > > > > > instructor gave it to me to male room at the end of June. I spent > my > > > > > summer > > > > > > vacation that year on the CB band with that thing. Some of that > rig > > is > > > > > here > > > > > > and there in the shack, sort of a ghost. When I saw it in the 1956 > > > > > handbook > > > > > > I bought at a fest... I almost had tears. It WAS the one I had. > > > > > > George > > > > > > AB2KC > > > > > > > > > > > > -----Original Message----- > > > > > > From: [EMAIL PROTECTED] > > > > > > [mailto:[EMAIL PROTECTED] On Behalf Of CHRIS > > > PAPAIOANNOU > > > > > > Sent: Tuesday, October 26, 2004 5:02 AM > > > > > > To: Discussion of AM Radio > > > > > > Cc: peter A Markavage > > > > > > Subject: Re: [AMRadio] 813 tx > > > > > > > > > > > > > > > > > > tnx Pete.. > > > > > > Chris,SV1DAF. > > > > > > ----- Original Message ----- > > > > > > From: "peter A Markavage" <[EMAIL PROTECTED]> > > > > > > To: <[email protected]> > > > > > > Sent: Tuesday, October 26, 2004 9:02 AM > > > > > > Subject: Re: [AMRadio] 813 tx > > > > > > > > > > > > > > > > > > > Here's some: > > > > > > > http://www.amwindow.org/tech/htm/813/813.htm > > > > > > > > > > > > > > http://www.remote.arrl.org/tis/info/pdf/5401011.pdf > > > > > > > > > > > > > > http://www.remote.arrl.org/tis/info/pdf/5610033.pdf > > > > > > > > > > > > > > http://www.remote.arrl.org/tis/info/pdf/57hb192.pdf > > > > > > > > > > > > > > Doing a "Google" search on "813 transmitter" turned up 49 hits. > > > > > > > > > > > > > > Pete, wa2cwa > > > > > > > > > > > > > > > > > > > > > On Tue, 26 Oct 2004 06:44:32 +0300 "CHRIS PAPAIOANNOU" > > > > > > > <[EMAIL PROTECTED]> writes: > > > > > > > > 73 to all group's members around, > > > > > > > > i'm new in this list.My name is Chris,my call is SV1DAF and > i'm > > > > > > > > located in Athens,Greece. > > > > > > > > I'm not new in AM..20-25 years ago there was too much AM > > activity > > > > > > > > here,with homemade tube rigs,in the MW band.Was illegal but > > there > > > > > > > > was.Then most of the "amateurs"became hams with legal activity > > in > > > > > > > > the ham bands.The rest of them left the radiowaves. > > > > > > > > Not long ago i started homebrewing again after long time.My > > > homebrew > > > > > > > > rigs now are: > > > > > > > > 1)6V6/807 crystal controlled where the 1st tube is the > > oscillator > > > > > > > > tube and the 2nd one the pa one. > > > > > > > > 2)6J5/EL34 > > > > > > > > I prefer plate modulation and the reasons are known and > > clear,and > > > > > > > > i'm using an amp with 2 EL504s like output tubes.These are > sweep > > > > > > > > tubes. > > > > > > > > I'm now searching for a tx drawing with an 813 tube like pa > > > tube.Any > > > > > > > > replies will be too much appreciated. > > > > > > > > Tnx for the attention paid to my introduction, > > > > > > > > 73,Chris,SV1DAF. > > > > > > > > > > > > > > ________________________________________________________________ > > > > > > > Speed up your surfing with Juno SpeedBand. > > > > > > > Now includes pop-up blocker! > > > > > > > Only $14.95/ month - visit http://www.juno.com/surf to sign up > > > today! > > > > > > > ______________________________________________________________ > > > > > > > AMRadio mailing list > > > > > > > Home: http://mailman.qth.net/mailman/listinfo/amradio > > > > > > > Help: http://mailman.qth.net/mmfaq.html > > > > > > > Post: mailto:[email protected] > > > > > > > > > > > > > ______________________________________________________________ > > > > > > AMRadio mailing list > > > > > > Home: http://mailman.qth.net/mailman/listinfo/amradio > > > > > > Help: http://mailman.qth.net/mmfaq.html > > > > > > Post: mailto:[email protected] > > > > > > > > > > > > ______________________________________________________________ > > > > > > AMRadio mailing list > > > > > > Home: http://mailman.qth.net/mailman/listinfo/amradio > > > > > > Help: http://mailman.qth.net/mmfaq.html > > > > > > Post: mailto:[email protected] > > > > > > > > > > > > > > > > ______________________________________________________________ > > > > > AMRadio mailing list > > > > > Home: http://mailman.qth.net/mailman/listinfo/amradio > > > > > Help: http://mailman.qth.net/mmfaq.html > > > > > Post: mailto:[email protected] > > > > > --- > > > > > Incoming mail is certified Virus Free. > > > > > Checked by AVG anti-virus system (http://www.grisoft.com). > > > > > Version: 6.0.784 / Virus Database: 530 - Release Date: 10/27/2004 > > > > > > > > > > --- > > > > > Outgoing mail is certified Virus Free. > > > > > Checked by AVG anti-virus system (http://www.grisoft.com). > > > > > Version: 6.0.786 / Virus Database: 532 - Release Date: 10/29/2004 > > > > > > > > > > ______________________________________________________________ > > > > > AMRadio mailing list > > > > > Home: http://mailman.qth.net/mailman/listinfo/amradio > > > > > Help: http://mailman.qth.net/mmfaq.html > > > > > Post: mailto:[email protected] > > > > > > > > > > > > > ______________________________________________________________ > > > > AMRadio mailing list > > > > Home: http://mailman.qth.net/mailman/listinfo/amradio > > > > Help: http://mailman.qth.net/mmfaq.html > > > > Post: mailto:[email protected] > > > > --- > > > > Incoming mail is certified Virus Free. > > > > Checked by AVG anti-virus system (http://www.grisoft.com). > > > > Version: 6.0.786 / Virus Database: 532 - Release Date: 10/29/2004 > > > > > > > > --- > > > > Outgoing mail is certified Virus Free. > > > > Checked by AVG anti-virus system (http://www.grisoft.com). > > > > Version: 6.0.786 / Virus Database: 532 - Release Date: 10/29/2004 > > > > > > > > ______________________________________________________________ > > > > AMRadio mailing list > > > > Home: http://mailman.qth.net/mailman/listinfo/amradio > > > > Help: http://mailman.qth.net/mmfaq.html > > > > Post: mailto:[email protected] > > > > > > > > > > -- > > > No virus found in this incoming message. > > > Checked by AVG Anti-Virus. > > > Version: 7.0.300 / Virus Database: 265.6.9 - Release Date: 1/6/2005 > > > > > > -- > > > No virus found in this outgoing message. > > > Checked by AVG Anti-Virus. > > > Version: 7.0.300 / Virus Database: 265.6.9 - Release Date: 1/6/2005 > > > > > > > > > > -- > > No virus found in this incoming message. > > Checked by AVG Anti-Virus. > > Version: 7.0.300 / Virus Database: 265.6.9 - Release Date: 1/6/2005 > > > > -- > > No virus found in this outgoing message. > > Checked by AVG Anti-Virus. > > Version: 7.0.300 / Virus Database: 265.6.9 - Release Date: 1/6/2005 > > > > > > -- > No virus found in this incoming message. > Checked by AVG Anti-Virus. > Version: 7.0.300 / Virus Database: 265.6.9 - Release Date: 1/6/2005 > > -- > No virus found in this outgoing message. > Checked by AVG Anti-Virus. > Version: 7.0.300 / Virus Database: 265.6.9 - Release Date: 1/6/2005 > >
