[Drakelist] FS: R-4B and a T-4XB
The R-4B and T-4XB are sold. Thanks for the interest. 73, Terry - W8NJR ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] FS: R-4B and a T-4XB
I am downsizing and selling some of my drake collection. I have the following FS: R-4B receiver. working and recently re-aligned. Cabinet has been repainted and looks good. Price... $225.00 plus shipping T-4XB transmitter. working and puts out 120 watts on 80m. Cabinet has been repainted. Price. $125.00 plus shipping I will sell both units together for ... $325.00 plus shipping. Because of it's age the Rx and Tx are being sold as is. If interested, please contact _w8njr@arrl.net_ (mailto:w8...@arrl.net) . More gear to follow. 73, Terry - W8NJR ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] FS: R-4B and a T-4XB
Has the transmitter been modified to present a normal AM carrier or original? From: w8...@aol.com [mailto:w8...@aol.com] Sent: Thursday, January 05, 2012 05:12 AM To: drakelist@zerobeat.net drakelist@zerobeat.net Subject: [Drakelist] FS: R-4B and a T-4XB I am downsizing and selling some of my drake collection. I have the following FS: R-4B receiver. working and recently re-aligned. Cabinet has been repainted and looks good. Price... $225.00 plus shipping T-4XB transmitter. working and puts out 120 watts on 80m. Cabinet has been repainted. Price. $125.00 plus shipping I will sell both units together for ... $325.00 plus shipping. Because of it's age the Rx and Tx are being sold as is. If interested, please contact w8...@arrl.netmailto:w8...@arrl.net . More gear to follow. 73, Terry - W8NJR ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] FS: R-4B and a T-4XB
John, Normal AM carrier can only be had with a true, plate modulated rig. The Drakes don't have enough iron or a heavy enough modulator to do much more than controlled carrier. I've seen mods, but. I sure wouldn't do it to my Drakes. 73, Don, WB5HAK___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] FS: R-4B and a T-4XB
- Original Message - From: Don Cunningham d...@martineer.net To: John Hudson john.hud...@calema.ca.gov; w8...@aol.com; drakelist@zerobeat.net Sent: Thursday, January 05, 2012 10:24 AM Subject: Re: [Drakelist] FS: R-4B and a T-4XB John, Normal AM carrier can only be had with a true, plate modulated rig. The Drakes don't have enough iron or a heavy enough modulator to do much more than controlled carrier. I've seen mods, but. I sure wouldn't do it to my Drakes. 73, Don, WB5HAK There is another reason for using controlled carrier; the resultant signal can be amplified by a linear amplifier designed for SSB wtihout exceeding its limits. This is true for both the linear in the rig and any external linear that may be used. I disagree only that true AM can be had with other than plate modulated transmitters; there have been many low-level modulated AM transmitters using linear amplifiers. However, a linear will have quite low average efficiency when used for AM. The estimate for old broadcast transmitters using linear amplifiers was an all day efficiency of around 33%. A reasonable plate modulated transmitter has at least twice this. Modern AM transmitters can exceed the old limit for efficiency by various methods, mostly by running the RF stage as nearly a pulse amplifier. Controlled carrier AM works fine for communication use but can be difficult to listen to on a receiver with a fast release AVC. Also, measuring modulation percentage is not as straight forward as for a conventional transmitter. If one wants real AM its better to get or build a dedicated transmitter but Drake makes it possible to communicate with those who may not have SSB receivers (who would that be?). -- Richard Knoppow Los Angeles WB6KBL dickb...@ix.netcom.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] FS: R-4B and a T-4XB
As to AM plate modulated TX... What transmitters are preferred?? And how much power is reasonable to use on AM...that is effective for communications. I see some of the TX's (DX-60, Ranger etc) are only 50-70 watts out. 73, Lee -Original Message- From: Richard Knoppow 1oldle...@ix.netcom.com To: Don Cunningham d...@martineer.net; John Hudson john.hud...@calema.ca.gov; W8NJR w8...@aol.com; drakelist drakelist@zerobeat.net Sent: Thu, Jan 5, 2012 2:08 pm Subject: Re: [Drakelist] FS: R-4B and a T-4XB - Original Message - From: Don Cunningham d...@martineer.net To: John Hudson john.hud...@calema.ca.gov; w8...@aol.com; drakelist@zerobeat.net Sent: Thursday, January 05, 2012 10:24 AM Subject: Re: [Drakelist] FS: R-4B and a T-4XB John, Normal AM carrier can only be had with a true, plate modulated rig. The Drakes don't have enough iron or a heavy enough modulator to do much more than controlled carrier. I've seen mods, but. I sure wouldn't do it to my Drakes. 73, Don, WB5HAK There is another reason for using controlled carrier; the resultant signal can be amplified by a linear amplifier designed for SSB wtihout exceeding its limits. This is true for both the linear in the rig and any external linear that may be used. I disagree only that true AM can be had with other than plate modulated transmitters; there have been many low-level modulated AM transmitters using linear amplifiers. However, a linear will have quite low average efficiency when used for AM. The estimate for old broadcast transmitters using linear amplifiers was an all day efficiency of around 33%. A reasonable plate modulated transmitter has at least twice this. Modern AM transmitters can exceed the old limit for efficiency by various methods, mostly by running the RF stage as nearly a pulse amplifier. Controlled carrier AM works fine for communication use but can be difficult to listen to on a receiver with a fast release AVC. Also, measuring modulation percentage is not as straight forward as for a conventional transmitter. If one wants real AM its better to get or build a dedicated transmitter but Drake makes it possible to communicate with those who may not have SSB receivers (who would that be?). -- Richard Knoppow Los Angeles WB6KBL dickb...@ix.netcom.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] FS: R-4B and a T-4XB
Oh, good grief. I'm outa here. You all have a nice year and CU some other time. Opinions are worth about what you pay for them. Later, Don, WB5HAK ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] FS: R-4B and a T-4XB
That's why I own a Viking II, but I've seen guys modify the Drakes.. From: Don Cunningham [mailto:d...@martineer.net] Sent: Thursday, January 05, 2012 10:24 AM To: John Hudson; w8...@aol.com w8...@aol.com; drakelist@zerobeat.net drakelist@zerobeat.net Subject: Re: [Drakelist] FS: R-4B and a T-4XB John, Normal AM carrier can only be had with a true, plate modulated rig. The Drakes don't have enough iron or a heavy enough modulator to do much more than controlled carrier. I've seen mods, but. I sure wouldn't do it to my Drakes. 73, Don, WB5HAK ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] FS: R-4B and a T-4XB
Lee - First thing to remember is that AM 'PEP' is four times the carrier power. So a Viking II at 100 W AM output has a peak power equivalent to a 400W SSB signal. Likewise, the Ranger, etc. are equivalent to a 200W SSB transmitter. The Ranger is a particularly nice transmitter, capable of full 100% modulation, which many of the other rigs cannot match. The Rangers were kinda like the Drakes, i.e., when you heard one on the air, you could tell by the signal quality that it was a Ranger / Drake. The Viking II and Heath DX-100/B are probably the 'standards' in their class. The Collins 32V series are great transmitters, but expensive and hard to work on, (assuming you're strong enough to move them to the bench!) The Viking II and DX-100/B both use a pair of 6146s in the PA, the 32V-2/3 uses a 4D32 in the PA. The AM in the DX-40, DX-60, and other Screen modulated transmitters is a step down from Plate Modulation. The max modulation capability is around 60-70% as I recall, resulting in a steady carrier with weak audio. With a decent signal strength, the listener hears silence with low audio level. The T-4X is Carrier Controlled AM, which is similar to Screen modulation, with the exception that the carrier is reduced when there is no modulation, reducing the dissipation of the PA stage. The variation in carrier level can be irritating on a receiver with no slow AVC capability as the receiver noise comes up between words, etc. There have been a couple of mods published that convert the T-4X to more of a Screen modulation technique, but the resultant increase in AVERAGE power is tough on PA(s) and Linear amps. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com kc9...@aol.com wrote: As to AM plate modulated TX... What transmitters are preferred?? And how much power is reasonable to use on AM...that is effective for communications. I see some of the TX's (DX-60, Ranger etc) are only 50-70 watts out. 73, Lee ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] FS: R-4B and a T-4XB
FWIW, I've been having lot of fun with a Globe Scout 40A (Heising plate modulation) at about 20W out on 40M. Use the T-4X (controlled carrier) also, believe it puts out about 25W and has worked fine for me. Would love to own a Ranger but they've become too expensive lately. Routinely have QSOs during the day on 40M over 100-300 miles. Some of the folks drive linears with their 25W, but I don't own one. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] FS: R-4B and a T-4XB Is this the topic?
Hey guys/gals, how about changing the subject line to fit the topic? Kris KM2KM ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] FS: R-4B and a T-4XB
I had a Ranger and it was nice. Sold it last fall, though, as I hadn't used it in quite some time. It and my SX-101 were taking up too much precious space, so I sold them and used part of the money towards some of my current Drake stuff. The Rangers sound great on AM and mine was hi-fi'ed by WA1HZK to a lot of the Timtron mods plus a few special ones that Keith had been working on. The problem is that it turned it into a Johnny One-Note in that you could only use it on AM (CW had been removed to make room for PTT circuits and the like). I wanted some old rigs that could be used on - and do a respectable job on - CW. I've thought about doing the K1JJ mod to the AM modulator and will probably do it first in Keith's T-4X, once I have it up on my bench again. I believe that mod is the one Garey was referring to in that it turns the transmitter more into a normal screen-modulated configuration. We'll see. Now that the thread has been hijacked, I wonder if the B-Line has sold ;-) I'd be interested but am holding out for some C's. That is a good price - especially for anyone looking for a T-4XB! 73, Steve Wedge, W1ES/4 Live free or die: Death is not the worst of evils. John Stark. All my computers have my signature with various pearls of wisdom appended thereto. -- From: Curt rhule...@comcast.net Sent: Thursday, January 05, 2012 4:06 PM To: drakelist@zerobeat.net; kc9...@aol.com Subject: Re: [Drakelist] FS: R-4B and a T-4XB FWIW, I've been having lot of fun with a Globe Scout 40A (Heising plate modulation) at about 20W out on 40M. Use the T-4X (controlled carrier) also, believe it puts out about 25W and has worked fine for me. Would love to own a Ranger but they've become too expensive lately. Routinely have QSOs during the day on 40M over 100-300 miles. Some of the folks drive linears with their 25W, but I don't own one. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
