[AMRadio] RE: MODULATION POWER REQUIRED
Most of us stay somewhere within the ballpark of the so-called legal limit, and worrying about an occasional voice peak that might jump a little over, every now and again for a milliseconds or two during the course of an entire old-buzzard transmission, is MUCH ADO ABOUT NOTHING. Is everyone that picky and consientious in regard to exceeding the posted speed limit when we drive, something that can actually put our own or someone else's life in danger? We need to be more concerned about overmodulation, flat-topping and other improper conditions that generate spurious distortion products and do actual harm on the bands by causing unnecessary splatter and interference beyond the limits of our normal channel width. (Not the same thing as the higher frequency audio components that occur naturally in our voice signals.) Don k4kyv __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] RE: MODULATION POWER REQUIRED
I understand the modern RICEBOXES had speech processing the clips peaks and filters the audio. I had a tube speech processor back in the 60's. It was a classic clipper/filter. It worked very well. For a lower power transmitter like the smaller Heath DX units you can increase the voice level clipping and filtering there by generating a higher modulation index without over modulating. And if properly set you won't exceed the legal limits. I am going to build another one for my current DX-60. Bob Macklin K5MYJ Seattle, Wa, Real Radios Glow in the Dark - Original Message - From: D. Chester [EMAIL PROTECTED] To: amradio@mailman.qth.net Sent: Friday, February 15, 2008 1:46 AM Subject: [AMRadio] RE: MODULATION POWER REQUIRED Most of us stay somewhere within the ballpark of the so-called legal limit, and worrying about an occasional voice peak that might jump a little over, every now and again for a milliseconds or two during the course of an entire old-buzzard transmission, is MUCH ADO ABOUT NOTHING. Is everyone that picky and consientious in regard to exceeding the posted speed limit when we drive, something that can actually put our own or someone else's life in danger? We need to be more concerned about overmodulation, flat-topping and other improper conditions that generate spurious distortion products and do actual harm on the bands by causing unnecessary splatter and interference beyond the limits of our normal channel width. (Not the same thing as the higher frequency audio components that occur naturally in our voice signals.) Don k4kyv __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net 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 Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Cap Substitution
What is the full AC secondary voltage of the tranny, 6 or 12V? He may have been attempting a doubler or tripler circuit and you got it with parts missing or miswired. If one diode was across the relay coil it is to prevent back EMF. A 24V relay will usually pull in around 16-18V. Carl KM1H - Original Message - From: Bob Macklin [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Thursday, February 14, 2008 11:05 PM Subject: Re: [AMRadio] Cap Substitution With a single 1N4007 and a capacitor you will have a filtered 1/2wave rectifier. It should charge to .9 time the 24V. That should be OK. You could use 4 1N4007s in a bridge and not use the capacitor. Bob Macklin K5MYJ Seattle, Wa, Real Radios Glow in the Dark - Original Message - From: JT Croteau [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Thursday, February 14, 2008 7:55 PM Subject: Re: [AMRadio] Cap Substitution Nope Bob, this guy definitely only had three 1N2069's in parallel - two cathodes to one anode connected directly to a 6.3V tranny. I'm not looking to put it back the way he had it, I'm putting it back the way the schematic shows it with a 1N4007 instead of the 1N91 shown (already have in my junk box) and a filter cap. I'm just trying to understand how he was getting the 24V relay to work with a 6.3V tranny. - JT On Thu, Feb 14, 2008 at 10:49 PM, Bob Macklin [EMAIL PROTECTED] wrote: Connecting diodes in parallel does not really effect the current like connecting batteries in parallel. The diode with he lowest forward drop will handle most of the current. But if you really had diodes connected with anode to cathode you don't have a rectifier. That configuration is used in voltage limiter circuits. Got to Radio Shack and get some 1N4000 series diodes and use them for rectifiers. You only need one for a 1/2wave rectifier. Or 4 connected in a bridge for a full wave rectifier. Are you sure the ones you have are not connected in a bridge circuit. There would be 4 diodes. And 2 of them would have the cathodes connected together. The other 2 would have the anodes connected together. Bob Macklin K5MYJ Seattle, Wa, Real Radios Glow in the Dark - Original Message - From: JT Croteau [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Thursday, February 14, 2008 7:38 PM Subject: Re: [AMRadio] Cap Substitution As a follow up to all this talk.. The person who did this mod, was rectifying the power to this 24V relay with three 1N2069's in parallel with 2 cathodes facing one direction and the other cathode facing the opposite direction. These were wired to a dedicated 6.3V tranny he also added. Any idea why he would have done this rather than using the 24V tap on the filament transformer specially there for a 24V relay? I measure roughly 26V on this tap so I would assume the tranny is fine. -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net 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 Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net 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 Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must
Re: [AMRadio] Cap Substitution
Carl: 6.3VAC with three 1N2069's across the relay, 2 facing the opposite direction from the other with 150 uF of capacitance. - JT On Fri, Feb 15, 2008 at 9:14 AM, jeremy-ca [EMAIL PROTECTED] wrote: What is the full AC secondary voltage of the tranny, 6 or 12V? He may have been attempting a doubler or tripler circuit and you got it with parts missing or miswired. If one diode was across the relay coil it is to prevent back EMF. A 24V relay will usually pull in around 16-18V. Carl KM1H - Original Message - From: Bob Macklin [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Thursday, February 14, 2008 11:05 PM Subject: Re: [AMRadio] Cap Substitution With a single 1N4007 and a capacitor you will have a filtered 1/2wave rectifier. It should charge to .9 time the 24V. That should be OK. You could use 4 1N4007s in a bridge and not use the capacitor. Bob Macklin K5MYJ Seattle, Wa, Real Radios Glow in the Dark - Original Message - From: JT Croteau [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Thursday, February 14, 2008 7:55 PM Subject: Re: [AMRadio] Cap Substitution Nope Bob, this guy definitely only had three 1N2069's in parallel - two cathodes to one anode connected directly to a 6.3V tranny. I'm not looking to put it back the way he had it, I'm putting it back the way the schematic shows it with a 1N4007 instead of the 1N91 shown (already have in my junk box) and a filter cap. I'm just trying to understand how he was getting the 24V relay to work with a 6.3V tranny. - JT On Thu, Feb 14, 2008 at 10:49 PM, Bob Macklin [EMAIL PROTECTED] wrote: Connecting diodes in parallel does not really effect the current like connecting batteries in parallel. The diode with he lowest forward drop will handle most of the current. But if you really had diodes connected with anode to cathode you don't have a rectifier. That configuration is used in voltage limiter circuits. Got to Radio Shack and get some 1N4000 series diodes and use them for rectifiers. You only need one for a 1/2wave rectifier. Or 4 connected in a bridge for a full wave rectifier. Are you sure the ones you have are not connected in a bridge circuit. There would be 4 diodes. And 2 of them would have the cathodes connected together. The other 2 would have the anodes connected together. Bob Macklin K5MYJ Seattle, Wa, Real Radios Glow in the Dark - Original Message - From: JT Croteau [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Thursday, February 14, 2008 7:38 PM Subject: Re: [AMRadio] Cap Substitution As a follow up to all this talk.. The person who did this mod, was rectifying the power to this 24V relay with three 1N2069's in parallel with 2 cathodes facing one direction and the other cathode facing the opposite direction. These were wired to a dedicated 6.3V tranny he also added. Any idea why he would have done this rather than using the 24V tap on the filament transformer specially there for a 24V relay? I measure roughly 26V on this tap so I would assume the tranny is fine. -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net 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 Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives:
Re: [AMRadio] Replacement Tubes
Bob Macklin wrote: How many people have left the skin on their fingers on a HOT 6L6? Is it the Ranger I (1614's) or Ranger II (7027's) that have B+ on a pin, that when 6L6's are substituted, the B+ appears on the outside metal plate of the tube? Ask me how I know... BZT But, that wasn't nothing compared to the 'thrill' I got one night, while talking to John/WA5BXO on 75m one night when I got across roughly 1kVDC. Mostly went through my right thumb... but I held the 'securely grounded' D-104 in the left hand... NOT fun! Nowadays, I don't let -me-, let alone anyone else, get behind my rig while it's on the air. -- Driving your AM Rig without a scope, is like driving your car at night, without headlights. (K4KYV) -- 73 = Best Regards, -Geoff/W5OMR __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Replacement Tubes
How many people have left the skin on their fingers on a HOT 6L6? Bob Macklin K5MYJ Seattle, Wa, Real Radios Glow in the Dark - Original Message - From: jeremy-ca [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Friday, February 15, 2008 6:20 AM Subject: Re: [AMRadio] Replacement Tubes Your rig is spec'ed for 6L6's period. What follows after that designator in US tubes is strictly the the bulb size and shape. You take your chances with any import tubes. The 5881 is a direct swap also. Carl KM1H - Original Message - From: JT Croteau [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Friday, February 15, 2008 12:34 AM Subject: Re: [AMRadio] Replacement Tubes Would Sovetek 6L6WXT+ priced at $24 for a matched pair be a good replacement for 6L6GB's? They are supposed to be modeled after the RCA 6L6GC blackplate, the Sovtek 6L6WXT+ features larger plate dimensions and improved grid structure for increased power handling capabilities. The 6L6WXT+ also features mica spacers with metal springs to eliminate tube rattle and microphonics. My rig is spec'd for 6L6GB's. Thanks -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net 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 Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net 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 Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Replacement Tubes
Your rig is spec'ed for 6L6's period. What follows after that designator in US tubes is strictly the the bulb size and shape. You take your chances with any import tubes. The 5881 is a direct swap also. Carl KM1H - Original Message - From: JT Croteau [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Friday, February 15, 2008 12:34 AM Subject: Re: [AMRadio] Replacement Tubes Would Sovetek 6L6WXT+ priced at $24 for a matched pair be a good replacement for 6L6GB's? They are supposed to be modeled after the RCA 6L6GC blackplate, the Sovtek 6L6WXT+ features larger plate dimensions and improved grid structure for increased power handling capabilities. The 6L6WXT+ also features mica spacers with metal springs to eliminate tube rattle and microphonics. My rig is spec'd for 6L6GB's. Thanks -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net 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 Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Replacement Tubes
Some 6L6 specs I found: Plate Voltage 275V max., 19W dissipation 6L6GC Plate Voltage 500V max. 30W dissipation -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Cap Substitution
Start from scratch and build a tripler using the 1N4007's you mentioned and 150-220MF caps. Put a diode across the coil after its finished. Also use a 10-20K bleeder on the PS output, 2-3W is sufficient. Carl KM1H - Original Message - From: JT Croteau [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Friday, February 15, 2008 9:51 AM Subject: Re: [AMRadio] Cap Substitution Carl: 6.3VAC with three 1N2069's across the relay, 2 facing the opposite direction from the other with 150 uF of capacitance. - JT On Fri, Feb 15, 2008 at 9:14 AM, jeremy-ca [EMAIL PROTECTED] wrote: What is the full AC secondary voltage of the tranny, 6 or 12V? He may have been attempting a doubler or tripler circuit and you got it with parts missing or miswired. If one diode was across the relay coil it is to prevent back EMF. A 24V relay will usually pull in around 16-18V. Carl KM1H - Original Message - From: Bob Macklin [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Thursday, February 14, 2008 11:05 PM Subject: Re: [AMRadio] Cap Substitution With a single 1N4007 and a capacitor you will have a filtered 1/2wave rectifier. It should charge to .9 time the 24V. That should be OK. You could use 4 1N4007s in a bridge and not use the capacitor. Bob Macklin K5MYJ Seattle, Wa, Real Radios Glow in the Dark - Original Message - From: JT Croteau [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Thursday, February 14, 2008 7:55 PM Subject: Re: [AMRadio] Cap Substitution Nope Bob, this guy definitely only had three 1N2069's in parallel - two cathodes to one anode connected directly to a 6.3V tranny. I'm not looking to put it back the way he had it, I'm putting it back the way the schematic shows it with a 1N4007 instead of the 1N91 shown (already have in my junk box) and a filter cap. I'm just trying to understand how he was getting the 24V relay to work with a 6.3V tranny. - JT On Thu, Feb 14, 2008 at 10:49 PM, Bob Macklin [EMAIL PROTECTED] wrote: Connecting diodes in parallel does not really effect the current like connecting batteries in parallel. The diode with he lowest forward drop will handle most of the current. But if you really had diodes connected with anode to cathode you don't have a rectifier. That configuration is used in voltage limiter circuits. Got to Radio Shack and get some 1N4000 series diodes and use them for rectifiers. You only need one for a 1/2wave rectifier. Or 4 connected in a bridge for a full wave rectifier. Are you sure the ones you have are not connected in a bridge circuit. There would be 4 diodes. And 2 of them would have the cathodes connected together. The other 2 would have the anodes connected together. Bob Macklin K5MYJ Seattle, Wa, Real Radios Glow in the Dark - Original Message - From: JT Croteau [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Thursday, February 14, 2008 7:38 PM Subject: Re: [AMRadio] Cap Substitution As a follow up to all this talk.. The person who did this mod, was rectifying the power to this 24V relay with three 1N2069's in parallel with 2 cathodes facing one direction and the other cathode facing the opposite direction. These were wired to a dedicated 6.3V tranny he also added. Any idea why he would have done this rather than using the 24V tap on the filament transformer specially there for a 24V relay? I measure roughly 26V on this tap so I would assume the tranny is fine. -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net 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 Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an
[AMRadio] Re: MODULATION POWER REQUIRED
Don, It seems that we have defined PEP power pretty well: Well, PEP is defined as the AVERAGE power over at least one RF cycle at the most powerful point of the envelope. Now, since we do not speak with sine waves, the average power point of the envelope is going to be less than 0.636 (sine wave average) of the peak value. With many voices the average might be 0.2 to 0.5 of the peak. Doesn't this mean we can increase the peak power until the PEP as we have defined it hits 1500 watts? It seems that many of us confuse peak power with Peak Envelope Power. The definitions are different. If I have this correct, then unprocessed voice peaks can be increased until the PEP legal limit is achieved, and the carrier level might be a lot more than 375 watts. Maybe the KW1, or Johnson Desk KW at Hi-Tap are still legal? Regards, Jim __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Cap Substitution
I was about to make a similar suggestion. But if the transformer has a 24V secondary jut use a FW diode bridge. Bob Macklin K5MYJ Seattle, Wa, Real Radios Glow in the Dark - Original Message - From: jeremy-ca [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Friday, February 15, 2008 7:03 AM Subject: Re: [AMRadio] Cap Substitution Start from scratch and build a tripler using the 1N4007's you mentioned and 150-220MF caps. Put a diode across the coil after its finished. Also use a 10-20K bleeder on the PS output, 2-3W is sufficient. Carl KM1H - Original Message - From: JT Croteau [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Friday, February 15, 2008 9:51 AM Subject: Re: [AMRadio] Cap Substitution Carl: 6.3VAC with three 1N2069's across the relay, 2 facing the opposite direction from the other with 150 uF of capacitance. - JT On Fri, Feb 15, 2008 at 9:14 AM, jeremy-ca [EMAIL PROTECTED] wrote: What is the full AC secondary voltage of the tranny, 6 or 12V? He may have been attempting a doubler or tripler circuit and you got it with parts missing or miswired. If one diode was across the relay coil it is to prevent back EMF. A 24V relay will usually pull in around 16-18V. Carl KM1H - Original Message - From: Bob Macklin [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Thursday, February 14, 2008 11:05 PM Subject: Re: [AMRadio] Cap Substitution With a single 1N4007 and a capacitor you will have a filtered 1/2wave rectifier. It should charge to .9 time the 24V. That should be OK. You could use 4 1N4007s in a bridge and not use the capacitor. Bob Macklin K5MYJ Seattle, Wa, Real Radios Glow in the Dark - Original Message - From: JT Croteau [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Thursday, February 14, 2008 7:55 PM Subject: Re: [AMRadio] Cap Substitution Nope Bob, this guy definitely only had three 1N2069's in parallel - two cathodes to one anode connected directly to a 6.3V tranny. I'm not looking to put it back the way he had it, I'm putting it back the way the schematic shows it with a 1N4007 instead of the 1N91 shown (already have in my junk box) and a filter cap. I'm just trying to understand how he was getting the 24V relay to work with a 6.3V tranny. - JT On Thu, Feb 14, 2008 at 10:49 PM, Bob Macklin [EMAIL PROTECTED] wrote: Connecting diodes in parallel does not really effect the current like connecting batteries in parallel. The diode with he lowest forward drop will handle most of the current. But if you really had diodes connected with anode to cathode you don't have a rectifier. That configuration is used in voltage limiter circuits. Got to Radio Shack and get some 1N4000 series diodes and use them for rectifiers. You only need one for a 1/2wave rectifier. Or 4 connected in a bridge for a full wave rectifier. Are you sure the ones you have are not connected in a bridge circuit. There would be 4 diodes. And 2 of them would have the cathodes connected together. The other 2 would have the anodes connected together. Bob Macklin K5MYJ Seattle, Wa, Real Radios Glow in the Dark - Original Message - From: JT Croteau [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Thursday, February 14, 2008 7:38 PM Subject: Re: [AMRadio] Cap Substitution As a follow up to all this talk.. The person who did this mod, was rectifying the power to this 24V relay with three 1N2069's in parallel with 2 cathodes facing one direction and the other cathode facing the opposite direction. These were wired to a dedicated 6.3V tranny he also added. Any idea why he would have done this rather than using the 24V tap on the filament transformer specially there for a 24V relay? I measure roughly 26V on this tap so I would assume the tranny is fine. -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help:
Re: [AMRadio] Replacement Tubes
On Fri, Feb 15, 2008 at 10:09 AM, jeremy-ca [EMAIL PROTECTED] wrote: JT, just put the manual in the drawer and pay attention to what we are trying to get thru to you. Karl, but according to Slab Bacon: GBs and GCs carry a little higher dissapation and power handling ratings and are designet to have a little more oomph at higher operating voltages. And also more designed for audio than RF service. The HV supply powering the plates on my 6L6's runs at 275W. The regular 6L6's have a max. rating of 275W, shouldn't I be using a tube with a slightly higher rating such as a GB or G6. I am trying to listen so please be patient with me, I am being told different things by different people. -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Replacement Tubes
Tell me the difference then.. What the manual says only represents the version that was in production at the time. 6L6's are not like 6146's where some versions are not interchangable in RF circuits at least. Carl KM1H - Original Message - From: JT Croteau [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Friday, February 15, 2008 9:54 AM Subject: Re: [AMRadio] Replacement Tubes On Fri, Feb 15, 2008 at 9:20 AM, jeremy-ca [EMAIL PROTECTED] wrote: Your rig is spec'ed for 6L6's period. Manual states otherwise, manual specs and schematic says 6L6GB's. -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net 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 Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Replacement Tubes
JT, just put the manual in the drawer and pay attention to what we are trying to get thru to you. IN YOUR APPLICATION they will all work as long as they physically fit. PERIOD, end of subject. Carl KM1H - Original Message - From: JT Croteau [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Friday, February 15, 2008 9:55 AM Subject: Re: [AMRadio] Replacement Tubes On Fri, Feb 15, 2008 at 9:20 AM, jeremy-ca [EMAIL PROTECTED] wrote: Your rig is spec'ed for 6L6's period. Manual states otherwise, manual specs and schematic says 6L6GB's. According to the specs, voltages are different between 6L6, 6L6GB, and 6L6GC with the GC's having the higher voltages. -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net 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 Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Replacement Tubes
On Fri, Feb 15, 2008 at 9:20 AM, jeremy-ca [EMAIL PROTECTED] wrote: Your rig is spec'ed for 6L6's period. Manual states otherwise, manual specs and schematic says 6L6GB's. -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Speech Processing Re: [AMRadio] RE: MODULATION POWER REQUIRED
Bob Let me know what u decide on. I'm running qrp AM and need every ounce to be intelligence. I can't waste power to be hifi. Was your ckt similar to the Eico modulator clipper? I assume you will strictly use tooobes? :-) bob...w2ami x wn2ami 1962 - Original Message - From: Bob Macklin [EMAIL PROTECTED] Subject: Re: [AMRadio] RE: MODULATION POWER REQUIRED I understand the modern RICEBOXES had speech processing the clips peaks and filters the audio. I had a tube speech processor back in the 60's. It was a classic clipper/filter. It worked very well. For a lower power transmitter like the smaller Heath DX units you can increase the voice level clipping and filtering there by generating a higher modulation index without over modulating. And if properly set you won't exceed the legal limits. I am going to build another one for my current DX-60. Bob Macklin K5MYJ __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] RE: MODULATION POWER REQUIRED
AMEN!!! Rev. Don W4BWS - Original Message - From: D. Chester [EMAIL PROTECTED] To: amradio@mailman.qth.net Sent: Friday, February 15, 2008 3:46 AM Subject: [AMRadio] RE: MODULATION POWER REQUIRED Most of us stay somewhere within the ballpark of the so-called legal limit, and worrying about an occasional voice peak that might jump a little over, every now and again for a milliseconds or two during the course of an entire old-buzzard transmission, is MUCH ADO ABOUT NOTHING. Is everyone that picky and consientious in regard to exceeding the posted speed limit when we drive, something that can actually put our own or someone else's life in danger? We need to be more concerned about overmodulation, flat-topping and other improper conditions that generate spurious distortion products and do actual harm on the bands by causing unnecessary splatter and interference beyond the limits of our normal channel width. (Not the same thing as the higher frequency audio components that occur naturally in our voice signals.) Don k4kyv __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Replacement Tubes
On Fri, Feb 15, 2008 at 9:20 AM, jeremy-ca [EMAIL PROTECTED] wrote: Your rig is spec'ed for 6L6's period. Manual states otherwise, manual specs and schematic says 6L6GB's. According to the specs, voltages are different between 6L6, 6L6GB, and 6L6GC with the GC's having the higher voltages. -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
[AMRadio] BROADCAST XMTR F?S
Hi guys and gals ...Listing this for Mason K5YHX. He is letting his RCA BT1R go along with the Audio Chain. This xmtr is 100% converted and on the air..I have a picture of it . I also have some audio clips. He will include his Audio Chain if you want it or sell it sepretly. Now the kicker is that it is a pick up only in the Dallas Area or you make all arrangements to ship it... Price is $1500.00 complete or $1300 for the RCA and $250 for the audio chain. The Audio Chain is a Peavy mixer with a Marshall condenser mic and a Marti compressor limiter. Again I am list it for Mason. He can be reached at 214-350-1947 which is his cell phone or cantact me for any pix or audio clip or go to my web site under Ham Shacks and the pix and clip are there. That is www.w1pe.com Thanks all... Very Best 73's Bob W1PE The Voice of Mesquite www.w1pe.com Money is only temporary, but radios are forever - Jim Little aka the old dog/K5BAI __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: Speech Processing Re: [AMRadio] RE: MODULATION POWER REQUIRED
I have not looked at the EICO modulator clipper. But I would expect it to be the type of speech processor shown in the ARRL handbooks from the 50's and 60's. I work with both tubes and solid state. Today this is the kind of thing that would be done with DSP. Why? Remote control! Look through some of the older ARRL Handbooks. These are easy to do in either tube or transistor circuits. In tube circuits it was common to use inductor/capacitor low pass filters. In transistor designs it was common to use active filters. Bob Macklin K5MYJ Seattle, Wa, Real Radios Glow in the Dark - Original Message - From: RJ Mattson [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Friday, February 15, 2008 7:25 AM Subject: Speech Processing Re: [AMRadio] RE: MODULATION POWER REQUIRED Bob Let me know what u decide on. I'm running qrp AM and need every ounce to be intelligence. I can't waste power to be hifi. Was your ckt similar to the Eico modulator clipper? I assume you will strictly use tooobes? :-) bob...w2ami x wn2ami 1962 - Original Message - From: Bob Macklin [EMAIL PROTECTED] Subject: Re: [AMRadio] RE: MODULATION POWER REQUIRED I understand the modern RICEBOXES had speech processing the clips peaks and filters the audio. I had a tube speech processor back in the 60's. It was a classic clipper/filter. It worked very well. For a lower power transmitter like the smaller Heath DX units you can increase the voice level clipping and filtering there by generating a higher modulation index without over modulating. And if properly set you won't exceed the legal limits. I am going to build another one for my current DX-60. Bob Macklin K5MYJ __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net 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 Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Replacement Tubes
JT, for the last time there is no difference in your application. And there is no such thing as a 6L6 with a 275V maximum rating. All except for the GC are rated at 350-375V depending upon which TUBE manual you read. Forget the audiophool crap on the Internet. The GC has higher ratings and will interchange WITH ANY other 6L6 PER THE RCA TUBE MANUAL. This is my LAST post on the subject. Carl KM1H - Original Message - From: JT Croteau [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Friday, February 15, 2008 10:17 AM Subject: Re: [AMRadio] Replacement Tubes On Fri, Feb 15, 2008 at 10:09 AM, jeremy-ca [EMAIL PROTECTED] wrote: JT, just put the manual in the drawer and pay attention to what we are trying to get thru to you. Karl, but according to Slab Bacon: GBs and GCs carry a little higher dissapation and power handling ratings and are designet to have a little more oomph at higher operating voltages. And also more designed for audio than RF service. The HV supply powering the plates on my 6L6's runs at 275W. The regular 6L6's have a max. rating of 275W, shouldn't I be using a tube with a slightly higher rating such as a GB or G6. I am trying to listen so please be patient with me, I am being told different things by different people. -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net 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 Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
[AMRadio] FW: [BOATANCHORS-TEMPE] BROADCAST XMTR F?S
CELL PHONE CORRECTION IS 214-293-4050.. PLEASE DO NOT CALL THE OTHER ## Subject: [BOATANCHORS-TEMPE] BROADCAST XMTR F?S Hi guys and gals ...Listing this for Mason K5YHX. He is letting his RCA BT1R go along with the Audio Chain. This xmtr is 100% converted and on the air..I have a picture of it . I also have some audio clips. He will include his Audio Chain if you want it or sell it sepretly. Now the kicker is that it is a pick up only in the Dallas Area or you make all arrangements to ship it... Price is $1500.00 complete or $1300 for the RCA and $250 for the audio chain. The Audio Chain is a Peavy mixer with a Marshall condenser mic and a Marti compressor limiter. Again I am list it for Mason. He can be reached at 214-293-4050 which is his cell phone or cantact me for any pix or audio clip or go to my web site under Ham Shacks and the pix and clip are there. That is www.w1pe.com Thanks all... Very Best 73's Bob W1PE The Voice of Mesquite www.w1pe.com Money is only temporary, but radios are forever - Jim Little aka the old dog/K5BAI --- This list is a public service of the City of Tempe, Arizona --- Subscription control - http://www.tempe.gov/lists/control.aspx?list=BOATANCHORS To post - [EMAIL PROTECTED] Archives - http://listserv.tempe.gov/archives/BOATANCHORS.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Cap Substitution
- Original Message - Subject: Re: [AMRadio] Cap Substitution Date: Thu, February 14, 2008 23:05 From: Bob Macklin [EMAIL PROTECTED] With a single 1N4007 and a capacitor you will have a filtered 1/2wave rectifier. It should charge to .9 time the 24V. That should be OK. You could use 4 1N4007s in a bridge and not use the capacitor. Nope Bob, this guy definitely only had three 1N2069's in parallel - two cathodes to one anode connected directly to a 6.3V tranny. I'm not looking to put it back the way he had it, I'm putting it back the way the schematic shows it with a 1N4007 instead of the 1N91 shown (already have in my junk box) and a filter cap. I'm just trying to understand how he was getting the 24V relay to work with a 6.3V tranny. - JT My guess is his intent was to make a voltage multiplier (doubler, tripler...) circuit, and either miswired it, or something is getting lost in the translation) -Larry/NE1S __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
[AMRadio] Re: [Boatanchors] FW: ham radio bad
Sorry I cut off the links! We hams are outlaws! . . neighbors showup at your door. http://www.youtube.com/watch?v=UKd5hupXJVofeature=related http://www.youtube.com/watch?v=D_LrOAbtZjIfeature=related - Original Message - From: Bob Macklin [EMAIL PROTECTED] To: Halicrafters [EMAIL PROTECTED]; Boatanchors list [EMAIL PROTECTED]; AM Radio amradio@mailman.qth.net; [EMAIL PROTECTED] Sent: Friday, February 15, 2008 9:40 AM Subject: [Boatanchors] FW: ham radio bad I remember those days. I had a TVI detector in my livingroom. HONEY! YOU HAVE THE TV AGAIN!. We had a CBer that gave us a lot of trouble. One night we pit a straight pin through his coax and cut it off flush. That kept him off the air for a while! Bob Macklin K5MYJ Seattle, Wa, Real Radios Glow in the Dark Here's a couple hilarious film clips. Looks like those real estate covenants had their start decades ago. ___ __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
[AMRadio] Re: GB FW: ham radio bad
We had a CBer that gave us a lot of trouble. One night we pit a straight pin through his coax and cut it off flush. That kept him off the air for a while! Yeah, the old Pin thru the Coax bit was a whole LOT of fun back in the day... but nowhere near as successful as the Cheap Walkie Talkie bit. You found out what the victim's favorite CB channel was, and got hold of a junker walkie talkie (100 milliwatt) crystaled for it. You'd then glue down the transmit button. Next... cut the leads to the speaker; in cheap, 1960s vintage HTs, the speaker doubled as a mike. Next... you'd cut the positive battery wire, and put a CdS photocell in series with it. Finally, you took off the whip antenna, and replaced it with a similar length of hookup wire. Once your radio was suitably modified, you'd sneak up to his house late at night and plant the rig nearby, preferably within 100 feet of his antenna. Toss it in the bushes with the new wire antenna spread out, and the photocell able to see the sky. When the sun came up, the CdS photocell's resistance would drop, raising the battery voltage to the radio and causing it to start transmitting an overpowering dead carrier on the dude's favorite channel. At the same time, the resistance of the conducting cell would also limit current flow to the radio, making the batteries last longer! It usually took a week or more for the batteries to wear out, and even longer than that for the smarter ones to go out and actually FIND the jammer! Mr. T., W9LBB __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
[AMRadio] FW: ham radio bad
I remember those days. I had a TVI detector in my livingroom. HONEY! YOU HAVE THE TV AGAIN!. We had a CBer that gave us a lot of trouble. One night we pit a straight pin through his coax and cut it off flush. That kept him off the air for a while! Bob Macklin K5MYJ Seattle, Wa, Real Radios Glow in the Dark Here's a couple hilarious film clips. Looks like those real estate covenants had their start decades ago. __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
[AMRadio] Re: FS BA Stuff And Great BA Books (Bounced message)
Don, I'm interested in this one if you haven't sold it yet: Radiotron Designers Handbook Fourth Edition (the BIG one). Some fading and shelf wear on cover and spine but basically very good or excellent condition. This is probably the one absolute must-have book for hollow-state aficionados. $69 I tried sending private e-mail to your address as soon as it appeared in the Digest, but it bounced as follows, so I am hoping you still have the book and will get this message via the Reflector. I have no clue why it didn't go through. Here is the error message: This Message was undeliverable due to the following reason: Your message was not delivered because the Domain Name System (DNS) for the destination computer is not configured correctly. The following is a list of reasons why this error message could have been generated. If you do not understand the explanations listed here, please contact your system administrator for help. - The host does not have any mail exchanger (MX) or address (A) records in the DNS. - The host has valid MX records, but none of the mail exchangers listed have valid A records. - There was a transient error with the DNS that caused one of the above to appear to be true. You may want to try sending your message again to see if the problem was only temporary. DNS for host yahoo.com is mis-configured. The following recipients did not receive this message: [EMAIL PROTECTED] Please reply to [EMAIL PROTECTED] if you feel this message to be in error. Don, k4kyv __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
RE: [AMRadio] Re: FS BA Stuff And Great BA Books (Bounced message)
Hmmm... I've sent a private email twice, but no response as yet. Wondering if that DNS problem is affecting my email too? So, I will publicly waste bandwidth and post my requests publicly here. Don, here's hoping you get this OK. -Original Message- From: Ed Sieb [mailto:[EMAIL PROTECTED] Sent: February 15, 2008 12:43 AM To: [EMAIL PROTECTED] Subject: RE: [AMRadio] FS BA Stuff And Great BA Books Don, If still available, I'd like to purchase the following books: Marcus and levy, Profitable Radio Troubleshooting, 1956, hardback with wall chart, Last chapter on starting a business. Otherwise a practical technical gold mine. $22 Marcus and Levy, Practical Radio Servicing, 2nd ed., 1963, hardback with dust jacket and 2 wall charts. Slightly dirty but excellent. Killer text. $24 H. J. Hicks, Principles and Practice of Radio Servicing, 1939, McGraw Hill hardback in superb condition, 300+ pages. Before Marcus and Levy, there was Hicks, with a dryer writing style, but more concrete examples. Marvelous text. $29 Eimac Tube Catalog, 1952. this is the one with a 4-page, 8.5x11 loose leaf flyer for each tube, with characteristics charts and detailed specs for each tube. I believe this catalog is complete. It has the color summary charts, several copies of the Eimac Pulse Tube Analysis Newsletter, plus flyers for all the Eimac tubes you know and love. Very good or excellent. $34 vy 73, Ed, VA3ES __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Replacement Tubes
JT Croteau wrote: On Fri, Feb 15, 2008 at 9:20 AM, jeremy-ca [EMAIL PROTECTED] wrote: Your rig is spec'ed for 6L6's period. Manual states otherwise, manual specs and schematic says 6L6GB's. According to the specs, voltages are different between 6L6, 6L6GB, and 6L6GC with the GC's having the higher voltages. It's always been my understanding that a 6L6Gx meant it was a 6L6 in a glass tube. But, since I wasn't sure, I went looking, and did a little investigation. You can check out the differences for yourself at http://www.mif.pg.gda.pl/homepages/frank/sheets65.html Then again, as someone else said, it seems much hoopla over the differences in 6L6's and 6V6's, and yet Zero comments on a Huff-n-Puff very stable VFO project. I'm not caring enough to make this an issue. I did like my zero responses about my VFO project when we can go days comparing the 6V6 to the 6L6. Maybe I'm subscribing to the wrong reflector! ;-() -- Driving your AM Rig without a scope, is like driving your car at night, without headlights. (K4KYV) -- 73 = Best Regards, -Geoff/W5OMR __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
[AMRadio] Re: What is PEP?
Don, It seems that we have defined PEP power pretty well: Well, PEP is defined as the AVERAGE power over at least one RF cycle at the most powerful point of the envelope. Now, since we do not speak with sine waves, the average power point of the envelope is going to be less than 0.636 (sine wave average) of the peak value. With many voices the average might be 0.2 to 0.5 of the peak. Doesn't this mean we can increase the peak power until the PEP as we have defined it hits 1500 watts? It seems that many of us confuse peak power with Peak Envelope Power. The definitions are different. If I have this correct, then unprocessed voice peaks can be increased until the PEP legal limit is achieved, and the carrier level might be a lot more than 375 watts. Maybe the KW1, or Johnson Desk KW at Hi-Tap are still legal? Now, this makes me REALLY feel for all the Hammy Hambone types out there. It has ME confused! BTW, another term for average power is mean power. There is no such thing as rms power. MEAN power is calculated, using Ohm's law, by multiplying RMS voltage by RMS current, as they work into a resistive load. Rms voltage and current are the effective values of an alternating current and voltage, meaning the equivalent measurement of DC that would produce the same effect. With a sine waveform, the rms value is .707 times the peak value. But the mean power into a load is also dependent on power factor, that is, whether the voltage and current are perfectly in phase, as they would be into a resistor. In a.c.circuits with a reactive component, voltage and current may not be exactly in phase, so that a direct calculation using measured values of voltage and current may give a figure that is greater than the actual power. That's why transformers are rated in volt-amperes, not watts. We don't talk in p.e.p. but we don't talk in sine waves, either. The loudness and interference-causing capability of a signal over the air is a function of mean, or average power radiated from the antenna, regardless of where occasional voice peaks may reach. The average amplitude of a typical human voice waveform is about 7 to 10 dB below the amplitude of the voice peaks. In other words, unless we use clipping or severe peak limiting, when our voice modulates a transmitter 100% on peaks, the average percentage of modulation is more like 30%. If you ever visit a properly running broadcast studio that still uses analogue, electro-mechanical VU meters, you will notice the readings stay well over to the left side of the scale most of the time to avoid hitting the red zone on peaks. Don k4kyv __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Re: What is PEP?
In the OLD DAYS the rule was 1KW INPUT POWER. But that rule did not work when SSB became the predominant phone mode. I think I recall a period where the power limit was defined in terms of DC INPUT POWER or PEAK ENVELOPE POWER. In those day the FCC did have a competent FIELD division. And they did have direction finder trucks. The ones I remember from about 1950 were BREAD VANS. They did go out and check on hams that were causing problems. Those were the early days of TV. Bob Macklin K5MYJ Seattle, Wa, Real Radios Glow in the Dark - Original Message - From: D. Chester [EMAIL PROTECTED] To: amradio@mailman.qth.net Sent: Friday, February 15, 2008 12:30 PM Subject: [AMRadio] Re: What is PEP? Don, It seems that we have defined PEP power pretty well: Well, PEP is defined as the AVERAGE power over at least one RF cycle at the most powerful point of the envelope. Now, since we do not speak with sine waves, the average power point of the envelope is going to be less than 0.636 (sine wave average) of the peak value. With many voices the average might be 0.2 to 0.5 of the peak. Doesn't this mean we can increase the peak power until the PEP as we have defined it hits 1500 watts? It seems that many of us confuse peak power with Peak Envelope Power. The definitions are different. If I have this correct, then unprocessed voice peaks can be increased until the PEP legal limit is achieved, and the carrier level might be a lot more than 375 watts. Maybe the KW1, or Johnson Desk KW at Hi-Tap are still legal? Now, this makes me REALLY feel for all the Hammy Hambone types out there. It has ME confused! BTW, another term for average power is mean power. There is no such thing as rms power. MEAN power is calculated, using Ohm's law, by multiplying RMS voltage by RMS current, as they work into a resistive load. Rms voltage and current are the effective values of an alternating current and voltage, meaning the equivalent measurement of DC that would produce the same effect. With a sine waveform, the rms value is .707 times the peak value. But the mean power into a load is also dependent on power factor, that is, whether the voltage and current are perfectly in phase, as they would be into a resistor. In a.c.circuits with a reactive component, voltage and current may not be exactly in phase, so that a direct calculation using measured values of voltage and current may give a figure that is greater than the actual power. That's why transformers are rated in volt-amperes, not watts. We don't talk in p.e.p. but we don't talk in sine waves, either. The loudness and interference-causing capability of a signal over the air is a function of mean, or average power radiated from the antenna, regardless of where occasional voice peaks may reach. The average amplitude of a typical human voice waveform is about 7 to 10 dB below the amplitude of the voice peaks. In other words, unless we use clipping or severe peak limiting, when our voice modulates a transmitter 100% on peaks, the average percentage of modulation is more like 30%. If you ever visit a properly running broadcast studio that still uses analogue, electro-mechanical VU meters, you will notice the readings stay well over to the left side of the scale most of the time to avoid hitting the red zone on peaks. Don k4kyv __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net 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 Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Re: GB FW: ham radio bad
Here's some good GLOWBUG stuff: http://www.youtube.com/watch?v=vBGIdf0VjQ4feature=related Bob Macklin K5MYJ Seattle, Wa, Real Radios Glow in the Dark - Original Message - From: Robert Nickels [EMAIL PROTECTED] To: Ben Dover [EMAIL PROTECTED]; Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Cc: [EMAIL PROTECTED] Sent: Friday, February 15, 2008 11:30 AM Subject: Re: [AMRadio] Re: GB FW: ham radio bad Ben Dover wrote: You found out what the victim's favorite CB channel was, and got hold of a junker walkie talkie (100 milliwatt) crystaled for it. You'd then glue down the transmit button. Aw, that's WAY too much work, Tom! Just clip the speaker leads and let that broadband rushbox detector do the work of jamming ALL channels at the same time. For best results, toss on roof and let it slide in the gutter near the antenna, attach 9ft of nearly invisible wire to make sure it was nice and strong. The nice thing is, those cheapie walkie-talkies came in pairs, and yep, the bozo fell for the same treatment twice! 73, Bob W9RAN The Glowbugs E-mail List Website is: *** *** http://www.mines.uidaho.edu/~glowbugs/ ** *** Send subscribe and unsubscribe requests to this address: ** [EMAIL PROTECTED] ** __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
RE: [AMRadio] Re: MODULATION POWER REQUIRED
The average VOLTAGE of a sine wave is meaningless. You don't use it to calculate average power. We are looking for the RMS value. The RF signal is always composed of sine waves no matter if there is modulation or no modulation. It also doesn't matter what the wave shape of the modulating signal is either, tones, voice or whatever, the RF coming out of the transmitter is still going to be sine waves. If it were not there would be serious harmonics generated. When we are talking about PEP and the average power over one or more cycles we are talking about the RF cycles of the transmitter. Each part of the audio envelope, even the narrowest peaks, are going to be composed of (contain) many RF cycles in each of those peaks. Being that all of those RF cycles are pure sine waves the rules of .707 times the peak voltage to find RMS voltage will always apply. The amplitude of those RF cycles will vary with the modulation envelope level. To measure PEP we pick a point that is the highest part of the modulation envelope (peak) and there will be many many pure RF sine waves contained there. We want to find the average power in those sine waves at that particular time. If you have a fast enough scope you can see exactly what is happening. Look at a transmitter modulated with a tone and you will see the familiar modulation envelope. Spread that way out by increasing the sweep speed and turn up the brightness and you will see all the RF cycles under the modulation envelope. Those are all pure sine waves and will always be. A 3.8 MHz signal with 1000 cycle modulation on it will show a 1000 cycle modulation envelope and contained in that envelope there will be 3800 RF cycles. You can break that down further and say that half of that audio envelope will be positive and half negative. So then the positive half will have 1900 RF cycles. We could break that down further and find how many cycles are near the peak if we wish. But the point is they are all RF cycles and good sine waves on which power is measured. If you are modulating the transmitter with speech the RF power still comes out in perfect sine waves regardless of the modulating waveform. If you were trying to measure audio power at the audio frequencies in this manner then it would not be pure sine waves with speech. 73 Gary K4FMX -Original Message- From: [EMAIL PROTECTED] [mailto:amradio- [EMAIL PROTECTED] On Behalf Of Jim Candela Sent: Friday, February 15, 2008 9:54 AM To: amradio@mailman.qth.net Subject: [AMRadio] Re: MODULATION POWER REQUIRED Don, It seems that we have defined PEP power pretty well: Well, PEP is defined as the AVERAGE power over at least one RF cycle at the most powerful point of the envelope. Now, since we do not speak with sine waves, the average power point of the envelope is going to be less than 0.636 (sine wave average) of the peak value. With many voices the average might be 0.2 to 0.5 of the peak. Doesn't this mean we can increase the peak power until the PEP as we have defined it hits 1500 watts? It seems that many of us confuse peak power with Peak Envelope Power. The definitions are different. If I have this correct, then unprocessed voice peaks can be increased until the PEP legal limit is achieved, and the carrier level might be a lot more than 375 watts. Maybe the KW1, or Johnson Desk KW at Hi-Tap are still legal? Regards, Jim __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Re: GB FW: ham radio bad
Ben Dover wrote: You found out what the victim's favorite CB channel was, and got hold of a junker walkie talkie (100 milliwatt) crystaled for it. You'd then glue down the transmit button. Aw, that's WAY too much work, Tom! Just clip the speaker leads and let that broadband rushbox detector do the work of jamming ALL channels at the same time. For best results, toss on roof and let it slide in the gutter near the antenna, attach 9ft of nearly invisible wire to make sure it was nice and strong. The nice thing is, those cheapie walkie-talkies came in pairs, and yep, the bozo fell for the same treatment twice! 73, Bob W9RAN __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Vintage Eico Model 730 Modulator
On Feb 15, 2008 7:15 PM, Bob Macklin [EMAIL PROTECTED] wrote: Here is something that always seems to be in demand: 360022942202 I was actually contemplating one of these a few weeks ago to run with a homebrew CW rig but not now that I have my Elmac rig. -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Vintage Eico Model 730 Modulator
I have an original copy of the Eico 730 Modulator manual if anyone needs it. Please contact off-list!! Joe W4AAB - Original Message - From: JT Croteau [EMAIL PROTECTED] To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Friday, February 15, 2008 6:18 PM Subject: Re: [AMRadio] Vintage Eico Model 730 Modulator On Feb 15, 2008 7:15 PM, Bob Macklin [EMAIL PROTECTED] wrote: Here is something that always seems to be in demand: 360022942202 I was actually contemplating one of these a few weeks ago to run with a homebrew CW rig but not now that I have my Elmac rig. -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net 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 Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
[AMRadio] FS Tube and Audio Literature, SCR-274N Manual, Handbooks
For Sale: Very Excellent BA, Audio and Tube Literature. Postage extra. Collins Signal magazine, Winter, 1954. Introducing the 75A4. $20 GE Essential Tube Characteristics, 1967, mildew marks may clean off. $6 Sams Audio Amplifiers AA-1, 1948 (1951 printing), missing front cover, tape at spine, but otherwise excellent. $59 Sams Audio Amplifiers AA-2, 1950, missing front cover, tape at spine, but otherwise excellent. $59 Sams Audio Amplifiers AA-4, 1953 (1955 printing), missing front cover, tape at spine, but otherwise excellent. $59 Sams Audio Amplifiers AA-5, 1954 (1956 printing), missing front cover, tape at spine, but otherwise excellent. $59 Sams Audio Amplifiers AA-9, 1957, missing front cover, tape at spine, but otherwise excellent. $59 Radio Set SCR-274-N Handbook of Instructions, original Signal Corps manual with many fold-out diagrams, Order No. 1470-NY-41, manual dated 5-42. Covers beat-up and taped at spine. $89 KT66 Tube original 2-color, 8.5x11 inch flyer, with separate BW data sheet, both published by British Industries Corp. $10/both Tung-Sol 5881 Color flyer 8.5 x 11, 2-sides. $5 El-Tronics Geiger-Muller Counter Tubes General technical Data, 4 pages. $5 Sylvania Glow Modulator Tubes, color flyer. $4 Set of Raytheon Special Purpose Tube Literature: Hearing-aid tubes, Magnetrons, Klystrons and TV Picture Tubes. Like new. Color. $17 Heintz and Kaufman, A Quick Reference To HK Electronic Tubes, 12 pages, cover splitting at fold, undated, maybe 1946? 1940? $16 Federal Telephone and Radio Corporation, Handbook of Tube Operation (3rd ed.), 8.5 x 11, 70 pages, chapters like: Secondary Emission In Transmitting Tubes, Tube Protection Problems, Filament Heating Transients, Proper Care of Metal To Glass Seals, etc. Also included is a set of FTR Nomographs for Double-Tuned Band Pass Circuits. Excellent condition. Undated, maybe 1949-50. $44 Trade Wanted: Trade Hammarlund SP-600-JX original manual with schematic fold-outs in excellent or near-mint condition for a Hammarlund SP-400-SX original manual in good shape. Stancor Transformers in The Williamson High Fidelity Amplifier, Stancor flyer dated 7-51, 11x17 folded to 8.5x11 with schematics and chassis layouts. $9 ARRL Handbook, 23rd ed., 1946, library hard bound in good shape. $14 Radio Handbook, 8th ed., 1941, Editors and Engineers, good. $16 Radio Handbook, 7th ed., 1940, Editors and Engineers, good but cover covering has a wrinkle in it. $16 Radio Handbook, 11th ed., 1947, Editors and Engineers, cover and overall excellent, but pages are faded at edges--otherwise this would be almost like new. $22 Thanks for looking. 73, Don Merz, N3RHT __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
[AMRadio] Sources for surplus Dummy Loads
I'm going to need a new dummy load and wondering if anyone knows of any surplus houses with a good selection. I seem to recall seeing a site a few years ago with more dummies than you could ever sort through but the name escapes me. I'm looking for something in the 500W to 1KW range for DC - 30 MHz. without breaking the bank. Is the Cantenna still the most economical way to go? Thanks -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
[AMRadio] Re: Sources for surplus Dummy Loads
Hmm, found some nice Bird Thermalines on eBay.. have to watch some of these as some have real low starting bids without reserves. -- JT Croteau, N1ESE - Manchester, NH (FN42gx) Contest Manager, TARA Skirmish __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
[AMRadio] Dummy loads
Hello JT, I purchased a Circa 1950 600watt load off epay a couple months ago for only $45. Called Bird and the fellow spent about half an hour helping me ID the thing and sent me a manual. I was impressed. My Antenna tuner has 1KW watt meters in it so didn't need the meter. Mike Harrison KE0ZU __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ 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:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
