Re: [AMRadio] Re: Your comments about AM
Mike Mertel, K7IR, developed what I believe is one the most innovative new antenna ideas in years if not in decades. The U.S. Patenet office apparently agrees and awarded him a patent for it. Mike is an Electrical Engineer but I don't believe he worked in the antenna field before starting SteppIR. That was born from his interest in ham radio. www.steppir.com Clever application of long understood and applied techniques. Original and innovative but hardly a state of the art advance. Dennis D. W7QHO Glendale, CA Advancing the state of the art rarely involves quantum leaps. If that were the case, then the last major innovation in the field of electronics was the invention of the transistor or maybe the magnetic disk drive. Everything since then (integrated circuits, microprocessors, memory, etc) is just an incremental improvement to an existing technology. Before the transistor it was probably the vaccum tube. For radio, the invention of telephony, RTTY and television were the last quantum leaps. SSB certainly would not qualify as advancing the state of the art based on the criteria you seem to be applying. Advancing the state of the art is any original and innovative idea that improves the art. 'The current state of the art in electronics and radio is based on thousands and thousands of small and innovative but incremental improvements to the art. Clay W7CE __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
Re: [AMRadio] Re: Your comments about AM
Mike Mertel, K7IR, developed what I believe is one the most innovative new antenna ideas in years if not in decades. The U.S. Patenet office apparently agrees and awarded him a patent for it. Mike is an Electrical Engineer but I don't believe he worked in the antenna field before starting SteppIR. That was born from his interest in ham radio. www.steppir.com 73, Clay W7CE - Original Message - From: Brian Carling [EMAIL PROTECTED] To: Discussion of AM Radio amradio@mailman.qth.net Sent: Sunday, January 15, 2006 5:22 PM Subject: RE: [AMRadio] Re: Your comments about AM Maybe I missed something... OK name something recent that was an innovation that radio amateur came up with that advanced the radio art. On 13 Jan 2006 at 16:32, Grant Youngman wrote: NO ONE in amateur radio advances the technological art these days. They haven't done so for many years. Maybe you're just not paying attention? Grant/NQ5T __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
Re: [AMRadio] Test?
At least one. Clay W7CE Lacey, WA - Original Message - From: Bob Macklin [EMAIL PROTECTED] To: Discussion of AM Radio amradio@mailman.qth.net Sent: Wednesday, July 06, 2005 11:29 AM Subject: Re: [AMRadio] Test? Seems it has been quiet here. Are there any PNW AMers on this list? Bob Macklin K5MYJ/7 Seattle, Wa. REAL RADIOS GLOW IN THE DARK - Original Message - From: Geoff [EMAIL PROTECTED] To: Discussion of AM Radio amradio@mailman.qth.net Sent: Wednesday, July 06, 2005 10:54 AM Subject: Re: [AMRadio] Test? Bob Macklin wrote: Bob Macklin K5MYJ/7 Seattle, Wa. REAL RADIOS GLOW IN THE DARK They bite, too. 73 = Best Regards, -Geoff/W5OMR __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net
Re: [AMRadio] 20V-3 Lamps
Just go to Google and type in 10S6/10-250. You'll get links to several online suppliers of this bulb. Clay W7CE - Original Message - From: Bob Maser [EMAIL PROTECTED] To: Discussion of AM Radio amradio@mailman.qth.net Sent: Friday, January 14, 2005 10:07 PM Subject: Re: [AMRadio] 20V-3 Lamps They are about 1-1/2 tall and have a screw-in base, kinda like the old Xmas tree lights but these run on 230vac. According to my 20V-3 manual, they have a GE part number 10S6/10-250, C-7A filament, S-6 bulb. Bob in Tampa, FL W6TR - Original Message - From: CHRIS PAPAIOANNOU [EMAIL PROTECTED] To: Discussion of AM Radio amradio@mailman.qth.net Sent: Friday, January 14, 2005 11:20 PM Subject: Re: [AMRadio] 20V-3 Lamps what kind of lamps are these 20v-3.I remember some lamps forgotten in my junkbox that i have no need of them. Chris SV1DAF. - Original Message - From: Bob Maser [EMAIL PROTECTED] To: AMRadio amradio@mailman.qth.net Sent: Saturday, January 15, 2005 6:30 AM Subject: [AMRadio] 20V-3 Lamps I am looking for a source of supply for the 230vac lamps used in the filament and plate indicators. Only one of mine functions, need at least one. Bob __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net
Re: [AMRadio] 20V3 bulbs
I checked Home Depot this evening and they carry the 120VAC S6 bulbs, but not the 230/250 version. I picked up a couple anyway. They work in my 300G and, as it turns out, my 20V-2 was modified for 120V bulbs with the addition of a dropping resistor. Eventually, I'll remove the dropping resistors and put 250V bulbs back in it. Clay - Original Message - From: Bob Maser [EMAIL PROTECTED] To: [EMAIL PROTECTED]; Discussion of AM Radio amradio@mailman.qth.net Sent: Saturday, January 15, 2005 9:39 AM Subject: Re: [AMRadio] 20V3 bulbs I just got back from HD and Lowes and neither store carried a 230vac bulb. I guess I'll wait until Monday and go visit a electrical supply store. Thanks anyway. Bob W6TR - Original Message - From: P Cour [EMAIL PROTECTED] To: amradio@mailman.qth.net Sent: Saturday, January 15, 2005 11:07 AM Subject: [AMRadio] 20V3 bulbs Correction Bob, yours is the 20V3. Our friend Mike W8BAC recently put one of them on the air, on both 75 and 160 meters. Pretty modern looking rig, I must say, and goes well with any living room decor. I got a better image of that bulb blister pack. Print it out and take it with you. Abco was making that 240V version I mentioned too. http://www.netohio.com/wa3vjb/bub.jpg --- [EMAIL PROTECTED] wrote: Send AMRadio mailing list submissions to amradio@mailman.qth.net To subscribe or unsubscribe via the World Wide Web, visit http://mailman.qth.net/mailman/listinfo/amradio or, via email, send a message with subject or body 'help' to [EMAIL PROTECTED] You can reach the person managing the list at [EMAIL PROTECTED] When replying, please edit your Subject line so it is more specific than Re: Contents of AMRadio digest... Today's Topics: 1. Re: 20V-3 Lamps (CHRIS PAPAIOANNOU) -- Message: 1 Date: Sat, 15 Jan 2005 08:44:15 +0200 From: CHRIS PAPAIOANNOU [EMAIL PROTECTED] Subject: Re: [AMRadio] 20V-3 Lamps To: Discussion of AM Radio amradio@mailman.qth.net Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=Windows-1252 Bob i'd like it too!let's wait for any good openings or the triumphal return of the solar emissions. Chris SV1DAF. - Original Message - From: Bob Maser [EMAIL PROTECTED] To: Discussion of AM Radio amradio@mailman.qth.net Sent: Saturday, January 15, 2005 9:01 AM Subject: Re: [AMRadio] 20V-3 Lamps Thanks Chris. Maybe I can work you on 75 on AM some evening. Bob - Original Message - From: CHRIS PAPAIOANNOU [EMAIL PROTECTED] To: Discussion of AM Radio amradio@mailman.qth.net Sent: Saturday, January 15, 2005 1:05 AM Subject: Re: [AMRadio] 20V-3 Lamps found some [EMAIL PROTECTED] not 230ac.It's not what you're looking for but anyway i see hr you allready found an end. Chris SV1DAF. - Original Message - From: Bob Maser [EMAIL PROTECTED] To: Clay Curtiss W7CE [EMAIL PROTECTED]; Discussion of AM Radio amradio@mailman.qth.net Sent: Saturday, January 15, 2005 8:41 AM Subject: Re: [AMRadio] 20V-3 Lamps I tried that and you are right! I am going to check out a nearby electrical supply house tomorrow. If no luck, I'll try some of the places shown by the Google search. Thanks forthe tip. Bob 6TR - Original Message - From: Clay Curtiss W7CE [EMAIL PROTECTED] To: Discussion of AM Radio amradio@mailman.qth.net Sent: Saturday, January 15, 2005 12:21 AM Subject: Re: [AMRadio] 20V-3 Lamps Just go to Google and type in 10S6/10-250. You'll get links to several online suppliers of this bulb. Clay W7CE - Original Message - From: Bob Maser [EMAIL PROTECTED] To: Discussion of AM Radio amradio@mailman.qth.net Sent: Friday, January 14, 2005 10:07 PM Subject: Re: [AMRadio] 20V-3 Lamps They are about 1-1/2 tall and have a screw-in base, kinda like the old Xmas tree lights but these run on 230vac. According to my 20V-3 manual, they have a GE part number 10S6/10-250, C-7A filament, S-6 bulb. Bob in Tampa, FL W6TR - Original Message - From: CHRIS PAPAIOANNOU [EMAIL PROTECTED] To: Discussion of AM Radio amradio@mailman.qth.net Sent: Friday, January 14, 2005 11:20 PM Subject: Re: [AMRadio] 20V-3 Lamps what kind of lamps are these 20v-3.I remember some lamps forgotten in my junkbox that i have no need of them. Chris SV1DAF. - Original Message - From: Bob Maser [EMAIL PROTECTED] To: AMRadio amradio@mailman.qth.net Sent: Saturday, January 15, 2005 6:30 AM Subject: [AMRadio] 20V-3 Lamps I am looking for a source of supply
Re: [AMRadio] Antique Transmitting Station Event Jan. 8th
Even under the best of conditions (which we don't have right now), those of us on the West Coast probably won't be able to hear the W3R Collins 300-G on 160M. I recently acquired a 300-G and will have it on the air for the Heavy Metal Rally from my QTH in Lacey, WA, just south of Seattle. I will be on either 1945 or 1925KC starting around 7:00-7:30PM PST this evening, depending on conditions. I plan on taking a late afternoon nap and will stay up as long as there are people to talk with. I hope to meet a lot of you there. 73, Clay W7CE - Original Message - From: P Cour [EMAIL PROTECTED] To: amradio@mailman.qth.net Sent: Monday, January 03, 2005 7:46 AM Subject: [AMRadio] Antique Transmitting Station Event Jan. 8th Subject: Antique Transmitting Station Event Jan. 8th Date: Mon, 3 Jan 2005 10:30:54 -0500 From: Courson, Paul Antique Transmitting Station Event Jan. 8th Please join us the evening of Saturday, Jan. 8 for a marathon, on-the-air showcase operating event from the Radio History Society's Radio-Television Museum near Washington, D.C., where we will be demonstrating our restored 1940s AM Broadcast transmitter and an antique companion receiver seen at: High resolution: http://www.netohio.com/wa3vjb/DSC00933.JPG Low resolution: http://www.qrz.com/W3R/ Our station's transmitter is a somewhat rare, art deco model highly sought by hobbyist radio collectors who retune them for the shortwave ham bands. Plans call for a record-setting gathering of this model among stations in North America, as heard in this discussion transmitted by one such transmitter as monitored in Chicago. The signals come a private home in Annapolis operating a 1947 example of the particular transmitter, a Collins 300-G rescued from an old Washington, D.C. movie house that was used as a radio station. http://www.netohio.com/wa3vjb/Five-300G.MP3 The warm and inviting sound of nostalgic AM is a powerful lure for people who've become ho-hum about plastic home entertainment centers and want to enjoy the storytelling nature of vintage radio. Frequencies of operation for shortwave reception or for licensed hobbyist stations to transmit: 1885 Kc (just above Standard Broadcast) 3880 Kc 7290 Kc Handsome certificates will be sent to confirm reception reports and/or two-way contacts. The Heavy Metal Rally gets its name from the weight and power of these old hollow state vacuum tube transmitters, many of which are being released into private hands by radio stations that have gone solid state. Participation is open to all, but to win top honors in this event, such a radio must weigh at least 250 pounds and make at least 250 watts of power. More about the collection of these magnificent old transmitters can be seen at: http://www.rwonline.com/reference-room/special-report/rwf-chromeJune20.shtml http://amfone.net/ECSound/WB2SYQ.htm - The following announcement on the Associated Press wire service coverage calendars will generate coverage among local broadcast outlets. FOR AP DAYBOOK Saturday, Jan. 8 4-9 p.m., BOWIE -- Open house and on-air demonstration of W3R, antique vacuum-tube AM broadcast station participating in a marathon Heavy Metal Rally nationwide among vintage radio hobbyists. Radio-Television Museum, 2608 Mitchellville Rd. Contact: Brian Belanger (301) 390-1020. __ Do you Yahoo!? Meet the all-new My Yahoo! - Try it today! http://my.yahoo.com __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net
Re: [AMRadio] Home brew AM Cathode modualtion
I appreciate all of the suggestions. I'm not locked into a particular tube configuration yet, but I have to admit there is something appealing about running the 450TH. It's probably my mental image of two of them lit up behind a glass window in the front panel :) Clay W7CE - Original Message - From: John Coleman, ARS WA5BXO [EMAIL PROTECTED] To: 'Discussion of AM Radio' amradio@mailman.qth.net Sent: Sunday, October 03, 2004 12:37 PM Subject: RE: [AMRadio] Home brew AM Cathode modualtion The Rice neutralization circuit works better with a higher Q grid tank and, if possible, some input swamping or grid load resistor. The biggest trouble with the circuit is that the loading of the grid tank is not constant over the full RF cycle as a result the Q and balance is shifted somewhat over the period of the RF cycle. Starting with a higher Q or C value is one way of minimizing this effect. The circuit does work because I used it as well and also with a 304TLs, back in the days of experimenting with the ultra modulation or balanced high level modulation circuits. I eventually went to standard Push Pull. John, WA5BXO -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Donald Chester Sent: Sunday, October 03, 2004 12:45 PM To: amradio@mailman.qth.net Subject: RE: [AMRadio] Home brew AM Cathode modualtion The 450th is a big triode, so I don't think you can run it single ended pie net output, you would need to do 2 250th tubes in push pull or something, but the 450th would do the cathode modulator quite well. You could use a single-ended pi-network type output circuit, with a balanced grid tank coil. That is knows as Rice neutralisation. You don't get as perfect null as you can with a balanced plate tank cincuit or a pushpull arrangement, but it works well enough that it became the standard design of tube type broadcast transmitters starting in the late 50's. I used that circuit with the first high power rf final I ever built, using a 304-TL in the final, because I didn't have a large split stator tuning capacitor on hand. Don K4KYV __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net
