|
100W HF power amplifier
Hi all;
I plan to build an HF power amplifier, output about 80-100W, not critical. It might look like as those used in popular Yaesu, Kenwood or Icom end PA stages, i.e. first stage as driver and the second as final amp., both in push-pull, transformer-separated. It should run directly with 13.8V supply. Of course, everything based on popular transistors as MRFxxx, 2SCxxxx, 2SDxxxx, IRFxxx MOS or russian (would be the best, since there are no problems with buying ones in my country). I've spend several evenings searching in googles, but I've failed to find anything suitable for me. Either I'm such a demanding person, or missed something while looking up in endless vastness of the internet. If anyone knew a well-designed project, or built one whenever in past, it would be welcome. TIA -- Pawe³ Stobiñski SQ9NRY Republic of Poland |
On Sat, 11 Oct 2003 20:58:22 +0200, "Pawe³ Stobiñski"
wrote: Hi all; I plan to build an HF power amplifier, output about 80-100W, not critical. It might look like as those used in popular Yaesu, Kenwood or Icom end PA stages, i.e. first stage as driver and the second as final amp., both in push-pull, transformer-separated. It should run directly with 13.8V supply. Of course, everything based on popular transistors as MRFxxx, 2SCxxxx, 2SDxxxx, IRFxxx MOS or russian (would be the best, since there are no problems with buying ones in my country). I've spend several evenings searching in googles, but I've failed to find anything suitable for me. Either I'm such a demanding person, or missed something while looking up in endless vastness of the internet. If anyone knew a well-designed project, or built one whenever in past, it would be welcome. Why not just copy a suitable proprietory schematic? What's the problem with that? -- "Windows [n.], A thirty-two bit extension and GUI shell to a sixteen bit patch to an eight bit operating system originally coded for a four bit microprocessor and produced by a two bit company." |
On Sat, 11 Oct 2003 20:58:22 +0200, "Pawe³ Stobiñski"
wrote: Hi all; I plan to build an HF power amplifier, output about 80-100W, not critical. It might look like as those used in popular Yaesu, Kenwood or Icom end PA stages, i.e. first stage as driver and the second as final amp., both in push-pull, transformer-separated. It should run directly with 13.8V supply. Of course, everything based on popular transistors as MRFxxx, 2SCxxxx, 2SDxxxx, IRFxxx MOS or russian (would be the best, since there are no problems with buying ones in my country). I've spend several evenings searching in googles, but I've failed to find anything suitable for me. Either I'm such a demanding person, or missed something while looking up in endless vastness of the internet. If anyone knew a well-designed project, or built one whenever in past, it would be welcome. Why not just copy a suitable proprietory schematic? What's the problem with that? -- "Windows [n.], A thirty-two bit extension and GUI shell to a sixteen bit patch to an eight bit operating system originally coded for a four bit microprocessor and produced by a two bit company." |
On Sat, 11 Oct 2003 20:58:22 +0200, "Pawe³ Stobiñski"
wrote: Hi all; I plan to build an HF power amplifier, output about 80-100W, not critical. It might look like as those used in popular Yaesu, Kenwood or Icom end PA stages, i.e. first stage as driver and the second as final amp. snipped Have you looked at Motorola's website?. There are a good number of Application Notes there with amps from 10w to Kw's for HF to uWave described in detail. There is also a company in US that stocks the 'hard to find' bits, and Kits, for them. Sadly I can't find the URL at the moment. |
On Sat, 11 Oct 2003 20:58:22 +0200, "Pawe³ Stobiñski"
wrote: Hi all; I plan to build an HF power amplifier, output about 80-100W, not critical. It might look like as those used in popular Yaesu, Kenwood or Icom end PA stages, i.e. first stage as driver and the second as final amp. snipped Have you looked at Motorola's website?. There are a good number of Application Notes there with amps from 10w to Kw's for HF to uWave described in detail. There is also a company in US that stocks the 'hard to find' bits, and Kits, for them. Sadly I can't find the URL at the moment. |
Could be RF Parts?
http://www.rfparts.com/mototran.html - Bruce Raymond/ND8I "Mike W" wrote in message ... On Sat, 11 Oct 2003 20:58:22 +0200, "Pawe³ Stobiñski" wrote: Hi all; I plan to build an HF power amplifier, output about 80-100W, not critical. It might look like as those used in popular Yaesu, Kenwood or Icom end PA stages, i.e. first stage as driver and the second as final amp. snipped Have you looked at Motorola's website?. There are a good number of Application Notes there with amps from 10w to Kw's for HF to uWave described in detail. There is also a company in US that stocks the 'hard to find' bits, and Kits, for them. Sadly I can't find the URL at the moment. |
Could be RF Parts?
http://www.rfparts.com/mototran.html - Bruce Raymond/ND8I "Mike W" wrote in message ... On Sat, 11 Oct 2003 20:58:22 +0200, "Pawe³ Stobiñski" wrote: Hi all; I plan to build an HF power amplifier, output about 80-100W, not critical. It might look like as those used in popular Yaesu, Kenwood or Icom end PA stages, i.e. first stage as driver and the second as final amp. snipped Have you looked at Motorola's website?. There are a good number of Application Notes there with amps from 10w to Kw's for HF to uWave described in detail. There is also a company in US that stocks the 'hard to find' bits, and Kits, for them. Sadly I can't find the URL at the moment. |
Paul Burridge wrote:
Why not just copy a suitable proprietory schematic? What's the problem with that? Yes, that's a good idea, however it is not always possible to decipher values of the elements, number of turns, type of magnetic material and so on. You cannot determine board layout, either. I believe it is relevant to the circuit not to start oscillating. -- Pawel Stobinski SQ9NRY Republic |
Paul Burridge wrote:
Why not just copy a suitable proprietory schematic? What's the problem with that? Yes, that's a good idea, however it is not always possible to decipher values of the elements, number of turns, type of magnetic material and so on. You cannot determine board layout, either. I believe it is relevant to the circuit not to start oscillating. -- Pawel Stobinski SQ9NRY Republic |
Mike W wrote:
Have you looked at Motorola's website?. There are a good number of Application Notes there with amps from 10w to Kw's for HF to uWave described in detail. There is also a company in US that stocks the 'hard to find' bits, and Kits, for them. Sadly I can't find the URL at the moment. Thanks! -- Pawe³ Stobiñski SQ9NRY Republic of Poland |
Mike W wrote:
Have you looked at Motorola's website?. There are a good number of Application Notes there with amps from 10w to Kw's for HF to uWave described in detail. There is also a company in US that stocks the 'hard to find' bits, and Kits, for them. Sadly I can't find the URL at the moment. Thanks! -- Pawe³ Stobiñski SQ9NRY Republic of Poland |
On Sun, 12 Oct 2003 01:22:41 GMT, "Bruce Raymond"
wrote: Could be RF Parts? http://www.rfparts.com/mototran.html No, The site I referred to sells Kits of all the hard to get parts for the Motorola RF amps, at a very good price too. Far less than Mainline used to sell the same thing. I've had a search on the web tonight and can't find the damn place. |
On Sun, 12 Oct 2003 01:22:41 GMT, "Bruce Raymond"
wrote: Could be RF Parts? http://www.rfparts.com/mototran.html No, The site I referred to sells Kits of all the hard to get parts for the Motorola RF amps, at a very good price too. Far less than Mainline used to sell the same thing. I've had a search on the web tonight and can't find the damn place. |
Mike W wrote:
On Sun, 12 Oct 2003 01:22:41 GMT, "Bruce Raymond" wrote: Could be RF Parts? http://www.rfparts.com/mototran.html No, The site I referred to sells Kits of all the hard to get parts for the Motorola RF amps, at a very good price too. Far less than Mainline used to sell the same thing. I've had a search on the web tonight and can't find the damn place. http://www.communication-concepts.com/default.htm 73, PJ |
Mike W wrote:
On Sun, 12 Oct 2003 01:22:41 GMT, "Bruce Raymond" wrote: Could be RF Parts? http://www.rfparts.com/mototran.html No, The site I referred to sells Kits of all the hard to get parts for the Motorola RF amps, at a very good price too. Far less than Mainline used to sell the same thing. I've had a search on the web tonight and can't find the damn place. http://www.communication-concepts.com/default.htm 73, PJ |
In article , Paul Jaeger
writes: Mike W wrote: On Sun, 12 Oct 2003 01:22:41 GMT, "Bruce Raymond" wrote: Could be RF Parts? http://www.rfparts.com/mototran.html No, The site I referred to sells Kits of all the hard to get parts for the Motorola RF amps, at a very good price too. Far less than Mainline used to sell the same thing. I've had a search on the web tonight and can't find the damn place. http://www.communication-concepts.com/default.htm Communications Concepts continues to advertise in printed media. They still have advertisements in RF Design, an electronics trade publication. Haven't looked at Communications Concepts web site lately but a couple years ago their reproduced Motorola application notes, most authored by Motorola's Helge Granberg, were of less than best quality in PDF. Still readable, though. Len Anderson retired (from regular hours) electronic engineer person |
In article , Paul Jaeger
writes: Mike W wrote: On Sun, 12 Oct 2003 01:22:41 GMT, "Bruce Raymond" wrote: Could be RF Parts? http://www.rfparts.com/mototran.html No, The site I referred to sells Kits of all the hard to get parts for the Motorola RF amps, at a very good price too. Far less than Mainline used to sell the same thing. I've had a search on the web tonight and can't find the damn place. http://www.communication-concepts.com/default.htm Communications Concepts continues to advertise in printed media. They still have advertisements in RF Design, an electronics trade publication. Haven't looked at Communications Concepts web site lately but a couple years ago their reproduced Motorola application notes, most authored by Motorola's Helge Granberg, were of less than best quality in PDF. Still readable, though. Len Anderson retired (from regular hours) electronic engineer person |
On Mon, 13 Oct 2003 09:27:10 -0700, Paul Jaeger
wrote: Mike W wrote: On Sun, 12 Oct 2003 01:22:41 GMT, "Bruce Raymond" wrote: Could be RF Parts? http://www.rfparts.com/mototran.html No, The site I referred to sells Kits of all the hard to get parts for the Motorola RF amps, at a very good price too. Far less than Mainline used to sell the same thing. I've had a search on the web tonight and can't find the damn place. http://www.communication-concepts.com/default.htm 73, PJ Thanks PJ, I spent about 3 hours searching last night without success. I wish we had a resource like that in UK. Your help appreciated and the URL bookmarked and backed-up atb Mike W, G8NXD |
On Mon, 13 Oct 2003 09:27:10 -0700, Paul Jaeger
wrote: Mike W wrote: On Sun, 12 Oct 2003 01:22:41 GMT, "Bruce Raymond" wrote: Could be RF Parts? http://www.rfparts.com/mototran.html No, The site I referred to sells Kits of all the hard to get parts for the Motorola RF amps, at a very good price too. Far less than Mainline used to sell the same thing. I've had a search on the web tonight and can't find the damn place. http://www.communication-concepts.com/default.htm 73, PJ Thanks PJ, I spent about 3 hours searching last night without success. I wish we had a resource like that in UK. Your help appreciated and the URL bookmarked and backed-up atb Mike W, G8NXD |
"Pawe³ Stobiñski" wrote in message
... Mike W wrote: Have you looked at Motorola's website?. There are a good number of Application Notes there with amps from 10w to Kw's for HF to uWave described in detail. There is also a company in US that stocks the 'hard to find' bits, and Kits, for them. Sadly I can't find the URL at the moment. Thanks! -- Pawe³ Stobiñski SQ9NRY Republic of Poland You should start with the books and Motorola Applicaiton notes by Helge Genberg (sk). Some libraries may have it, or you can order from RF Parts. http://www.rfparts.com/tranbook.html RADIO FREQUENCY TRANSISTORS, Principles and Practical Applications Co-authored with Norman Dye should be your bible for this project. 2nd edition • 290 pages • 1.25 lbs Part #: RFT • Price: $44.95 Adobe Acrobat copies of the Motorola Application Notes http://www.communication-concepts.co...tion_notes.htm w9gb |
"Pawe³ Stobiñski" wrote in message
... Mike W wrote: Have you looked at Motorola's website?. There are a good number of Application Notes there with amps from 10w to Kw's for HF to uWave described in detail. There is also a company in US that stocks the 'hard to find' bits, and Kits, for them. Sadly I can't find the URL at the moment. Thanks! -- Pawe³ Stobiñski SQ9NRY Republic of Poland You should start with the books and Motorola Applicaiton notes by Helge Genberg (sk). Some libraries may have it, or you can order from RF Parts. http://www.rfparts.com/tranbook.html RADIO FREQUENCY TRANSISTORS, Principles and Practical Applications Co-authored with Norman Dye should be your bible for this project. 2nd edition • 290 pages • 1.25 lbs Part #: RFT • Price: $44.95 Adobe Acrobat copies of the Motorola Application Notes http://www.communication-concepts.co...tion_notes.htm w9gb |
| All times are GMT +1. The time now is 10:33 PM. |
Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
RadioBanter.com