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1. Re: [Amps] eb-104 bias question (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Sun, 16 Jan 2011 17:31:10 -0700; Dan, The EB-104 uses an MC1723 voltage regulator. D5 is a 28 volt zener for the input of the regulator assuming you are obtaining the bias voltage from the 50 volt supply. I assume you have removed D; /archives//html/Amps/2011-01/msg00165.html (8,379 bytes)
2. Re: [Amps] RF in the Audio (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Sat, 24 Sep 2011 23:13:29 -0600; From Wikipedia: In telecommunications <http://en.wikipedia.org/wiki/Telecommunication> and professional audio <http://en.wikipedia.org/wiki/Professional_audio>, a *balanced line* or *balanced signal; /archives//html/Amps/2011-09/msg00182.html (9,501 bytes)
3. Re: [Amps] RF in the Audio (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Sat, 24 Sep 2011 23:24:00 -0600; On second thought, if all the impedances are equal, the currents are equal but I doubt that can really occur in the real world. Tom W0IVJ _______________________________________________ Amps mailing; /archives//html/Amps/2011-09/msg00183.html (9,916 bytes)
4. Re: [Amps] Mismatch loss (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Wed, 02 May 2012 13:42:26 -0600; No! 40+J30 and 40-J30 are the north and south points on the 2:1 SWR circle of the Smith chart where 100+J0 and 25+J0 are the east and west points. 73 T0m W0IVJ _______________________________________; /archives//html/Amps/2012-05/msg00079.html (10,465 bytes)
5. Re: [Amps] every db lost re Tubes vs. Solid State (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Wed, 02 May 2012 13:58:00 -0600; Larry is correct. Mismatch loss does not necessarily involve a feed line. Mismatch loss is the loss in dB of the power delivered to a load that is not conjugately matched to the source compared to th; /archives//html/Amps/2012-05/msg00085.html (12,893 bytes)
6. Re: [Amps] Tubes vs. Solid State (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Wed, 02 May 2012 21:19:18 -0600; I have been following this thread with great interest. I have built two SS linear amplifiers, one at a kilowatt and one at 600 watts. Neither of these amplifiers are my designs. Both were designed by; /archives//html/Amps/2012-05/msg00098.html (31,260 bytes)
7. Re: [Amps] Antenna tuner loss (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Fri, 04 May 2012 07:37:29 -0600; Kevin Schmidt, W9CF, has a nice Java app where you can study the losses in a T-network tuner at http://fermi.la.asu.edu/w9cf/tuner/tuner.html Tom W0VJ _______________________________________________; /archives//html/Amps/2012-05/msg00164.html (10,150 bytes)
8. Re: [Amps] Tubes vs. Solid State (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Fri, 04 May 2012 17:43:57 -0600; Bob, I am experimenting with the 300 W Freescale part. Using the brass tube output transformer with a single turn on the primary and 2 turns on the secondary without a harmonic filter I measured the; /archives//html/Amps/2012-05/msg00190.html (13,723 bytes)
9. Re: [Amps] LDMOS Solid State Amplifiers (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Sat, 05 May 2012 09:30:45 -0600; Bob, Vdd was fed in at the U point on the brass tube, single turn, point. If I switch back to that transformer, I'll try the bifilar choke feed and report. I did some IMD measurements this morning. I; /archives//html/Amps/2012-05/msg00204.html (17,235 bytes)
10. Re: [Amps] LDMOS Solid State Amplifiers (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Sat, 05 May 2012 18:53:58 -0600; Roger is correct. The two exciters, which were about 70 kHz apart in frequency, were combined with a 6-dB combiner and the input IMD was monitored with a through sampler as it went into the amp. The; /archives//html/Amps/2012-05/msg00212.html (22,844 bytes)
11. Re: [Amps] LDMOS Solid State Amplifiers (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Sun, 06 May 2012 10:42:25 -0600; Bob, I am using the Freescale 300 W part. The part number is MRFE6VP6300H. I will probably not build this into an amplifier. I have two home brew solid state amplifiers, one at a kilowatt and one at; /archives//html/Amps/2012-05/msg00220.html (11,295 bytes)
12. Re: [Amps] LDMOS Solid State Amplifiers (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Sun, 06 May 2012 13:05:04 -0600; Joe, I wonder if two of the VRF-2933 in parallel would have too much capacitance. Tom _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com; /archives//html/Amps/2012-05/msg00223.html (11,477 bytes)
13. Re: [Amps] LDMOS Solid State Amplifiers (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Sun, 06 May 2012 19:00:56 -0600; Hi Gary, B = 20Log(1+10^(-A/20)) Let's say you measured the input IMD3 at -44 dB and the output IMD3 at -32 dB. The difference is 12 dB and that is A. Divide A by 20 which equals 0.6. Negate that and; /archives//html/Amps/2012-05/msg00225.html (27,778 bytes)
14. Re: [Amps] 300 W single band mobile amp needed (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Mon, 08 Oct 2012 14:28:19 -0600; I ran 100 watts from a bicycle. I ran one of the RF exposure applications to check the exposure. I think I was about 2 feet from the antenna and it was safe on 20 meters. The motorcycle will probably; /archives//html/Amps/2012-10/msg00066.html (11,819 bytes)
15. Re: [Amps] 500 uh plate choke (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Tue, 22 Jan 2013 15:35:59 -0700; Rob, The network is called a PI network because the shunt capacitors and series inductor resemble the Greek letter PI. Tom W0IVJ I am not saying it won't work in a modern RF power amp but all of the; /archives//html/Amps/2013-01/msg00132.html (10,101 bytes)
16. Re: [Amps] Expert 1k amp (score: 1): Author: tlthompson <tlthompson@qwest.net>; Date: Thu, 07 Mar 2013 10:12:09 -0700; Yes they are. Carl KM1H Steve, I did an unscientific check with my SPE 1K. Ripple on the RF envelope at the 1KW level is no worse than with my Alpha 77Dx and 87A at 1500W. It's just noticeable on the; /archives//html/Amps/2013-03/msg00079.html (11,461 bytes)
17. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Fri, 03 May 2013 21:11:41 -0600; As long as the transceiver manufacturers give us transceivers with poor IMD, it does little good to get the IMD on the amplifier good, unless you home brew your own transceiver. Tom W0IVJ On 5/3/2013; /archives//html/Amps/2013-05/msg00056.html (11,178 bytes)
18. Re: [Amps] Monitoring temperature (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Sun, 09 Jun 2013 14:19:29 -0600; Hi Bill, I used the LM35A on my solid state kilowatt and solid state 600 watt amplifiers. With the proper filtering it works fine. Here is a circuit from my web site. http://tomthompson.com/radio/600; /archives//html/Amps/2013-06/msg00205.html (8,452 bytes)
19. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Tue, 08 Oct 2013 14:09:42 -0600; The SI570 chip is an interesting alternative for a DDS. I have measured the phase noise at -139 dBc/Hz at 10 kHz away from the carrier. It does require a microprocessor to load the registers but it i; /archives//html/Amps/2013-10/msg00135.html (13,474 bytes)
20. Re: [Amps] Need small chain and sprockets for tuner project (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Fri, 31 Jan 2014 18:05:52 -0700; Try this: http://www.mcmaster.com/# Sent from my Verizon Wireless 4G LTE Smartphone _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/m; /archives//html/Amps/2014-01/msg00354.html (8,343 bytes)

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