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1. [Amps] Transceiver Output Impedance (score: 1): Author: "Robert Carroll" <w2wg@comcast.net>; Date: Sat, 8 Mar 2008 19:10:26 -0500; I have been told that modern solid state HF transceivers have been designed to deliver rated power into a stated load resistance-almost always around 50 ohms-but that their effective internal impedan; /archives//html/Amps/2008-03/msg00082.html (6,910 bytes)
2. Re: [Amps] Transceiver Output Impedance (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Sun, 9 Mar 2008 03:18:01 +0100; For maximum power transfer the output impedance and the load must be the same. Above and below that value power drops. The internal low impedance of a solid state amp is converted to 50 Ohms by a wid; /archives//html/Amps/2008-03/msg00084.html (8,036 bytes)
3. Re: [Amps] Transceiver Output Impedance (score: 1): Author: "Saandy Eban" <alexeban@gmail.com>; Date: Sun, 9 Mar 2008 11:01:03 +0200; .....this is definitely not so! The load impedance of the final transistors is defined by Ohm's law so that for a defined high power the load they expect to see can be a few ohms only. Here is where; /archives//html/Amps/2008-03/msg00088.html (9,191 bytes)
4. Re: [Amps] Transceiver Output Impedance (score: 1): Author: "Roger (K8RI)" <sub1@rogerhalstead.com>; Date: Sun, 09 Mar 2008 05:23:09 -0400; As the Pi or Pi-L network transforms the high plate impedance of a tube amp down to the 50 ohms. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com; /archives//html/Amps/2008-03/msg00089.html (9,996 bytes)
5. Re: [Amps] Transceiver Output Impedance (score: 1): Author: peter.chadwick@Zarlink.Com; Date: Sun, 9 Mar 2008 10:46:44 +0000; This is an interesting question, and there are two schools of thought. One says that you get maximum power when you have a conjugate match, and the other says you get maximum power when feeding an op; /archives//html/Amps/2008-03/msg00090.html (9,775 bytes)
6. Re: [Amps] Transceiver Output Impedance (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Sun, 09 Mar 2008 08:18:48 -0500; One of these days I will try the following experiment. I will MAKE a rf signal generator and add resistance in series with it to a load of 50ohms and stop adding resistance when the load voltage is h; /archives//html/Amps/2008-03/msg00091.html (8,445 bytes)
7. Re: [Amps] Transceiver Output Impedance (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Sun, 9 Mar 2008 11:18:28 -0400; I remember reading a letter from Kenwood about 20 years ago that stated that their SS PA stages were designed to operate into 25-75 Ohm loads since 50 Ohm cable was not a world wide standard. Ive bee; /archives//html/Amps/2008-03/msg00092.html (10,382 bytes)
8. Re: [Amps] Transceiver Output Impedance (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Sun, 09 Mar 2008 15:52:57 +0000; Hi Bob, Yes, indeed the internal impedance can be quite far removed from 50 Ohm. The heavier the negative feedback is in the amplifier, the lower its output impedance becomes. In many solid state amp; /archives//html/Amps/2008-03/msg00093.html (11,558 bytes)
9. Re: [Amps] Transceiver Output Impedance (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Sun, 09 Mar 2008 15:53:27 +0000; Hi Bob, Yes, indeed the internal impedance can be quite far removed from 50 Ohm. The heavier the negative feedback is in the amplifier, the lower its output impedance becomes. In many solid state amp; /archives//html/Amps/2008-03/msg00094.html (11,951 bytes)
10. Re: [Amps] Transceiver Output Impedance (score: 1): Author: "Carl Clawson" <carlclawson@verizon.net>; Date: Sun, 09 Mar 2008 10:06:39 -0700; This should be measurable. In class A you could just bias up the amplifier and measure it, no? Other classes are more problematic because they are non-linear and you'd need to have them producing pow; /archives//html/Amps/2008-03/msg00096.html (10,953 bytes)
11. Re: [Amps] Transceiver Output Impedance (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 09 Mar 2008 12:56:02 -0800; NO! This is a major misunderstanding of the maximum power transfer theorem, which says that if a generator has a fixed value of resistance (that is, we can change ONLY the load resistance) AND IS LI; /archives//html/Amps/2008-03/msg00100.html (9,598 bytes)
12. Re: [Amps] Transceiver Output Impedance (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Sun, 9 Mar 2008 23:23:27 +0100; The amplifier is happiest when the load is equal to the typically designed Zout: 50 ohms resistive. That practical loads might be different is another story and designers have to take care of that by; /archives//html/Amps/2008-03/msg00104.html (9,349 bytes)
13. Re: [Amps] Transceiver Output Impedance (score: 1): Author: "Roger (K8RI)" <sub1@rogerhalstead.com>; Date: Sun, 09 Mar 2008 19:15:21 -0400; Many years ago in a different life I was in the amateur radio business when it was quite profitable. I used to loan out an HF transceiver or two to local groups for special operations, FD, or demonst; /archives//html/Amps/2008-03/msg00106.html (12,095 bytes)

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