Re: [AMRadio] New 40M AM Net
Just one 6L6GB., It will be a converted Globe HiBander! On 10 Oct 2004 at 21:32, Geoff/W5OMR wrote: Let me think about it Geoff. that is a good suggestion. I will see if the FL guys think they can handle that. It MIGHT make it hard for some of us on the shorter skip with FL and GA to hear each other, but if we started around 11:00 AM Eastern and ran for an hour or so that would give you guys a chance to join us, and if we find that 12 noon still works for everyone we could move to that time instead. THANKS AGAIN for your interest! I will likely be running a 6146A modulated by a 6L6 here! A pair of 6L6's? ;-) Then you'd have a Ranger, or several other little rigs. 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
Re: [AMRadio] Re: AMRadio Digest, Vol 8, Issue 33
*ahem* Where are you located Brad? On 10 Oct 2004 at 18:45, [EMAIL PROTECTED] wrote: I am planning to, looking to get involved in AM any way I can Have a Johnson 500 and 390a for over 25 years thanks Brad Reno Nevada is interested Brad KB7FQR THANKS
Re: [AMRadio] BW 5100B
It's normal for power to deflect downward on AM during modulation. You have to have a peak reading wattmeter to see the peaks. Sounds like you have good modulation. Cory/AD5QP Tom Elmore [EMAIL PROTECTED] wrote: I am in the process of restoring a BW 5100B transmitter and am using a Coaxial Dynamics wattmeter to measure power. I normally use this meter for CW SSB and noticed that when monitoring an AM carrier the meter deflects downward with modulation. Is this a characteristic of this meter or maybe an issue with the transmitter itself. Thank You Thomas Elmore KA1NVZ Anchorage, Alaska __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net - Do you Yahoo!? vote.yahoo.com - Register online to vote today! From [EMAIL PROTECTED] Mon Oct 11 10:33:44 2004 Return-Path: [EMAIL PROTECTED] Delivered-To: amradio@mailman.qth.net Received: from web81001.mail.yahoo.com (web81001.mail.yahoo.com [206.190.37.146]) by mailman.qth.net (Postfix) with SMTP id D4505859D1A for amradio@mailman.qth.net; Mon, 11 Oct 2004 10:33:41 -0400 (EDT) Message-ID: [EMAIL PROTECTED] Received: from [12.14.128.194] by web81001.mail.yahoo.com via HTTP; Mon, 11 Oct 2004 07:24:39 PDT Date: Mon, 11 Oct 2004 07:24:39 -0700 (PDT) From: Jim Candela [EMAIL PROTECTED] Subject: Re: [AMRadio] BW 5100B To: Discussion of AM Radio amradio@mailman.qth.net In-Reply-To: [EMAIL PROTECTED] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-BeenThere: amradio@mailman.qth.net X-Mailman-Version: 2.1.4 Precedence: list Reply-To: Discussion of AM Radio amradio@mailman.qth.net List-Id: Discussion of AM Radio amradio.mailman.qth.net List-Unsubscribe: http://mailman.qth.net/mailman/listinfo/amradio, mailto:[EMAIL PROTECTED] List-Archive: http://mailman.qth.net/mailman/private/amradio List-Post: mailto:amradio@mailman.qth.net List-Help: mailto:[EMAIL PROTECTED] List-Subscribe: http://mailman.qth.net/mailman/listinfo/amradio, mailto:[EMAIL PROTECTED] X-List-Received-Date: Mon, 11 Oct 2004 14:33:44 - Cory, I once had a peak responding watt-meter, and you are correct they are necessary to see the peaks. With my ultra-modulated Viking I it read 100 watts carrier, and 400 watts PEP at 100% tone modulation. It also read 800 watts at 200% + modulation. If I switched to average mode it read 150 watts at 100% tone modulation. I currently use a Bird wattmeter without the peak option. It too shows a 50% rise in power at 100% tone modulation so long as my transmitter has no carrier shift. A RF amp meter if in line with the RF output should show a 22.5% rise at 100% tone modulation. Regards, Jim --- Cory Hine [EMAIL PROTECTED] wrote: It's normal for power to deflect downward on AM during modulation. You have to have a peak reading wattmeter to see the peaks. Sounds like you have good modulation. Cory/AD5QP Tom Elmore [EMAIL PROTECTED] wrote: I am in the process of restoring a BW 5100B transmitter and am using a Coaxial Dynamics wattmeter to measure power. I normally use this meter for CW SSB and noticed that when monitoring an AM carrier the meter deflects downward with modulation. Is this a characteristic of this meter or maybe an issue with the transmitter itself. Thank You Thomas Elmore KA1NVZ Anchorage, Alaska __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net - Do you Yahoo!? vote.yahoo.com - Register online to vote today! __ 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] Mod xmfr
Hey guys: Thanks for all this education on the plate modulator for my 2 x 813's. Seems to me that: 1. current carrying capability of the wire is first; 2. turns ratio ( creating impedance ) comes next; Just how difficult would it be to make one? Our predecessors did. E/I core or over/under on one core? I understand Hypersil cores are easy to get. Might have a challenge counting high numbers...hi hi 73 Steve WA2TAK
Re: [AMRadio] Mod xmfr
Steve, There was a series in ER (Electric Radio), by W3BYM, Tom Marcellino. He built an AM 2-813s modulating 2-813s. It is a beautiful looking and sounding rig. Very much in the class of T-368s or BC-610s. Perhaps even better! If interested, I'll hunt through the collection and get the specific editions for you. Bob - N0DGN [EMAIL PROTECTED] wrote: Hey guys: Thanks for all this education on the plate modulator for my 2 x 813's. Seems to me that: 1. current carrying capability of the wire is first; 2. turns ratio ( creating impedance ) comes next; Just how difficult would it be to make one? Our predecessors did. E/I core or over/under on one core? I understand Hypersil cores are easy to get. Might have a challenge counting high numbers...hi hi 73 Steve WA2TAK Bob Bethman - N0DGN +---+--+ | N0DGN AMRadio Manassas, VA|REAL Tube Radio and AM| +---+--+ | Manassas Radio - Home of Homemade Kielbasa Pirogi| +---+--+ | Bob Bethman\\\|/// The absence of a danger | | rbethman(at)comcast.net \\ ~ ~ // signal does *NOT* mean | | (/ @ @ /) that everything is OK | +-oOOo-(_)-oOOo+ | http://home.comcast.net/~rbethman| | 1 BC-610I w/BC-614I,1 T-213/GRC-26 w/BC614I 1 '51 Collins R-390A | | 1 '67 EAC R-390A, Heathkit DX-60, Apache, Mohawk, SX-101, HT-32A | +--+ | Amateur Astronomer - Celestron Nexstar 8 | | 12 f5 Dob coming soon! Being built | | Meade ETX-60 (Got it back!) | | 38 Deg 46.8' N - 77 Deg 28.5' W| +--+ | Opinions expressed are that of my own and do not necessarily | | coincide with or represent those of ANYONE else | +--+ ALL E-mail received and sent scanned by AVG Norton Anti-Virus
Re: [AMRadio] Re: AMRadio Digest, Vol 8, Issue 33
I, too, am interested in AM nets. I have such low power and inefficient antenna I hesitate to mix it up with the big guns. 73, Ed Richards K6UUZ On Sun, 10 Oct 2004 21:56:19 -0500 Geoff/W5OMR [EMAIL PROTECTED] writes: *ahem* Where are you located Brad? On 10 Oct 2004 at 18:45, [EMAIL PROTECTED] wrote: I am planning to, looking to get involved in AM any way I can Have a Johnson 500 and 390a for over 25 years thanks Brad Reno Nevada is interested Brad KB7FQR THANKS __ 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] BW 5100B
The BW 5100 transmitter I recently acquired does not have the original modulation transformer but a replacement made by Stancor. When I modulate the transmitter with a 400 Hz tone about 50 % into a dummy load I see a significant decrease in power at least 25 watts. I measured this with both my Bird and Coaxial Dynamics wattmeter. I don't see a return to normal power until I remove the modulation. I'm wondering if the primary and secondary on the modulation transformer are possibly backward. The original owner included some documentation for the mod transformer that shows it's possible to use either the primary or secondary winding connected to the plates of the modulator tubes in my case 6146's for different types of transmitters and impedances. -Tom - Original Message - From: Donald Chester [EMAIL PROTECTED] To: amradio@mailman.qth.net Sent: Monday, October 11, 2004 9:32 AM Subject: Re: [AMRadio] BW 5100B It's normal for power to deflect downward on AM during modulation. You have to have a peak reading wattmeter to see the peaks. Sounds like you have good modulation. With an average-reading wattmeter, theoretically the power should shift upwards 50% with 100% modulation with a sinewave tone. An rf ammeter in line should kick upwards about 22%. A field strength meter should show no change, since it reads average voltage output. With voice modulation, the upward shift in power will be much less, since the duty cycle of a voice signal is much less than that of a pure sine wave. The rf ammeter will show little, if any deflection with voice modulation. Whistle into the mic or play some music, and the meters will show more positive deflection. If the carrier level (field strength) meter, rf ammeter or wattmeter show any downward deflection during modulation (voice, tone or music), something is wrong. The transmitter is showing poor modulation linearity. There may be a slight downward shift in carrier strength due to less than perfect voltage regulation of the power supply, especially with plate modulation. This should be no more than 5 percent. The power and rf line current should still kick upwards. 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
Re: [AMRadio] Re: AMRadio Digest, Vol 8, Issue 33
In a message dated 10/11/04 11:01:40 AM, [EMAIL PROTECTED] writes: I, too, am interested in AM nets. I have such low power and inefficient antenna I hesitate to mix it up with the big guns. 73, Ed Richards K6UUZ Ed, Let me suggest the following given your location in SOCAL: AMI net, Wed evenings 9:00PM PDT, 3870 kHZ 40M Arizona Net, Sat. Sun. 10:00AM, 7293 kHz (informal) West Coast Military Collectors Net, Sat., 9:00 PM, 3983 +/- QRM (Focus on military surplus equipment but all are welcome.) Also, look for AM activity on weekends, 3855 around 6:00AM, and in the evenings 3870 - 3885. Dennis D. W7QHO Glendale, CA AMI Director, SW Region
Re: [AMRadio] Re: AMRadio Digest, Vol 8, Issue 33
The Collins Radio Association's advisory board would like its members to participate and support in an AM Net on 40 meters and W3CRA would be willing to serve as an alternate net control. Thank you. Dave, W3ST Publisher of the Collins Journal Secretary to the Collins Radio Association www.collinsra.com Nets: 3805 Khz, Monday/Wednesdays 8 PM EDST 14250 Khz Saturday, 12 Noon EDST - Original Message - From: [EMAIL PROTECTED] To: [EMAIL PROTECTED]; amradio@mailman.qth.net Sent: Monday, October 11, 2004 3:53 PM Subject: Re: [AMRadio] Re: AMRadio Digest, Vol 8, Issue 33 In a message dated 10/11/04 11:01:40 AM, [EMAIL PROTECTED] writes: I, too, am interested in AM nets. I have such low power and inefficient antenna I hesitate to mix it up with the big guns. 73, Ed Richards K6UUZ Ed, Let me suggest the following given your location in SOCAL: AMI net, Wed evenings 9:00PM PDT, 3870 kHZ 40M Arizona Net, Sat. Sun. 10:00AM, 7293 kHz (informal) West Coast Military Collectors Net, Sat., 9:00 PM, 3983 +/- QRM (Focus on military surplus equipment but all are welcome.) Also, look for AM activity on weekends, 3855 around 6:00AM, and in the evenings 3870 - 3885. Dennis D. W7QHO Glendale, CA AMI Director, SW Region __ 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] BW 5100B
It's normal for power to deflect downward on AM during modulation. You have to have a peak reading wattmeter to see the peaks. Sounds like you have good modulation. Cory/AD5QP I can't agree with that, Cory... See Jim (WD5JKO) Candela's post on why. 73 = Best Regards, -Geoff/W5OMR
Re: [AMRadio] Mod xmfr
I have info I got somewhere off the web about K1JJ's pair of 813's modulated by a pair of 813's. Joe W4AAB - Original Message - From: Rbethman [EMAIL PROTECTED] To: Discussion of AM Radio amradio@mailman.qth.net Sent: Monday, October 11, 2004 12:07 PM Subject: Re: [AMRadio] Mod xmfr Steve, There was a series in ER (Electric Radio), by W3BYM, Tom Marcellino. He built an AM 2-813s modulating 2-813s. It is a beautiful looking and sounding rig. Very much in the class of T-368s or BC-610s. Perhaps even better! If interested, I'll hunt through the collection and get the specific editions for you. Bob - N0DGN [EMAIL PROTECTED] wrote: Hey guys: Thanks for all this education on the plate modulator for my 2 x 813's. Seems to me that: 1. current carrying capability of the wire is first; 2. turns ratio ( creating impedance ) comes next; Just how difficult would it be to make one? Our predecessors did. E/I core or over/under on one core? I understand Hypersil cores are easy to get. Might have a challenge counting high numbers...hi hi 73 Steve WA2TAK Bob Bethman - N0DGN +---+--+ | N0DGN AMRadio Manassas, VA|REAL Tube Radio and AM| +---+--+ | Manassas Radio - Home of Homemade Kielbasa Pirogi| +---+--+ | Bob Bethman\\\|/// The absence of a danger | | rbethman(at)comcast.net \\ ~ ~ // signal does *NOT* mean | | (/ @ @ /) that everything is OK | +-oOOo-(_)-oOOo+ | http://home.comcast.net/~rbethman| | 1 BC-610I w/BC-614I,1 T-213/GRC-26 w/BC614I 1 '51 Collins R-390A | | 1 '67 EAC R-390A, Heathkit DX-60, Apache, Mohawk, SX-101, HT-32A | +--+ | Amateur Astronomer - Celestron Nexstar 8 | | 12 f5 Dob coming soon! Being built | | Meade ETX-60 (Got it back!) | | 38 Deg 46.8' N - 77 Deg 28.5' W| +--+ | Opinions expressed are that of my own and do not necessarily | | coincide with or represent those of ANYONE else | +--+ ALL E-mail received and sent scanned by AVG Norton Anti-Virus __ 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] Mod xmfr
That's it!!! Joe W4AAB - Original Message - From: Jim Wilhite [EMAIL PROTECTED] To: Discussion of AM Radio amradio@mailman.qth.net Sent: Monday, October 11, 2004 7:53 PM Subject: Re: [AMRadio] Mod xmfr Check here: http://www.amwindow.org/tech/htm/813/813.htm - Original Message - From: Crawfish [EMAIL PROTECTED] To: [EMAIL PROTECTED]; Discussion of AM Radio amradio@mailman.qth.net Sent: Monday, October 11, 2004 7:38 PM Subject: Re: [AMRadio] Mod xmfr I have info I got somewhere off the web about K1JJ's pair of 813's modulated by a pair of 813's. Joe W4AAB - Original Message - From: Rbethman [EMAIL PROTECTED] To: Discussion of AM Radio amradio@mailman.qth.net Sent: Monday, October 11, 2004 12:07 PM Subject: Re: [AMRadio] Mod xmfr Steve, There was a series in ER (Electric Radio), by W3BYM, Tom Marcellino. He built an AM 2-813s modulating 2-813s. It is a beautiful looking and sounding rig. Very much in the class of T-368s or BC-610s. Perhaps even better! If interested, I'll hunt through the collection and get the specific editions for you. Bob - N0DGN [EMAIL PROTECTED] wrote: Hey guys: Thanks for all this education on the plate modulator for my 2 x 813's. Seems to me that: 1. current carrying capability of the wire is first; 2. turns ratio ( creating impedance ) comes next; Just how difficult would it be to make one? Our predecessors did. E/I core or over/under on one core? I understand Hypersil cores are easy to get. Might have a challenge counting high numbers...hi hi 73 Steve WA2TAK Bob Bethman - N0DGN +---+--+ | N0DGN AMRadio Manassas, VA|REAL Tube Radio and AM | +---+--+ | Manassas Radio - Home of Homemade Kielbasa Pirogi | +---+--+ | Bob Bethman\\\|/// The absence of a danger | | rbethman(at)comcast.net \\ ~ ~ // signal does *NOT* mean | | (/ @ @ /) that everything is OK | +-oOOo-(_)-oOOo+ | http://home.comcast.net/~rbethman | | 1 BC-610I w/BC-614I,1 T-213/GRC-26 w/BC614I 1 '51 Collins R-390A | | 1 '67 EAC R-390A, Heathkit DX-60, Apache, Mohawk, SX-101, HT-32A | +--+ | Amateur Astronomer - Celestron Nexstar 8 | | 12 f5 Dob coming soon! Being built | | Meade ETX-60 (Got it back!) | | 38 Deg 46.8' N - 77 Deg 28.5' W | +--+ | Opinions expressed are that of my own and do not necessarily | | coincide with or represent those of ANYONE else | +--+ ALL E-mail received and sent scanned by AVG Norton Anti-Virus __ 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
