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Total 13 documents matching your query.

1. Re: LF: MF PA (score: 1): Author: "C. Groeger" <[email protected]>; Date: Tue, 11 Sep 2012 20:26:21 +0200; Hi Stefan, Ok, I recognized the problem with the foto and had to resend my mail without:-) Meanwhile my tx is back on the air. I think the methode with the bulb is ok for mf as it works also well on; /rsgb_lf_group-archives/html/rsgb_lf_group/2012-09/msg00017.html (11,543 bytes)
2. Re: LF: MF PA (score: 1): Author: "mal hamilton" <[email protected]>; Date: Tue, 11 Sep 2012 19:42:52 +0100; Take a look at the cct that the Decca 5501 uses and copy this for robust and failsafe resualts. A series PA tank cct resonated at the frequency of interest is desireable. This is what I am currently; /rsgb_lf_group-archives/html/rsgb_lf_group/2012-09/msg00024.html (12,025 bytes)
3. Re: LF: MF PA (score: 1): Author: Stefan Schäfer <[email protected]>; Date: Tue, 11 Sep 2012 23:18:21 +0200; Hi Christian, OK, that sounds not to bad. However 10W may be a bit high without a load. I would guess there may be a non-optimal gate voltage or a small overlap time in which both FETs are conducting; /rsgb_lf_group-archives/html/rsgb_lf_group/2012-09/msg00093.html (11,124 bytes)
4. Re: LF: MF PA (score: 1): Author: Stefan Schäfer <[email protected]>; Date: Mon, 10 Sep 2012 14:07:56 +0200; Hello Christian, Am 10.09.2012 10:05, schrieb C. Groeger: Hi Stefan! I don't know the problem yet. Maybe these small fets went to hot. My pa design is very simple, 2 x irf 540 parallel in class D, tr; /rsgb_lf_group-archives/html/rsgb_lf_group/2012-09/msg00461.html (10,901 bytes)
5. LF: MF PA (score: 1): Author: Stefan Schäfer <[email protected]>; Date: Mon, 10 Sep 2012 00:44:34 +0200; Hi Christian, Ah, that explains the long and deep QSB ;-) At least these FETs are quiet cheap. What is your PA design and operating voltage? Do you know what the problem has been? Overvoltage or over; /rsgb_lf_group-archives/html/rsgb_lf_group/2012-09/msg00502.html (12,209 bytes)
6. LF: MF PA (score: 1): Author: "C. Groeger" <[email protected]>; Date: Tue, 11 Sep 2012 11:51:35 +0200; Christian Groeger Hi Stefan, Thanks for these infos! This is always helpful because I'm not a really good technican. Everything I built was a mixtiure of my ideas and stuff from the net... Output pow; /rsgb_lf_group-archives/html/rsgb_lf_group/2012-09/msg00589.html (10,878 bytes)
7. Re: LF: MF PA (score: 1): Author: "C. Groeger" <[email protected]>; Date: Mon, 10 Sep 2012 10:05:26 +0200; Hi Stefan! I don't know the problem yet. Maybe these small fets went to hot. My pa design is very simple, 2 x irf 540 parallel in class D, transformer to 50 ohm, Pi filter and variometer. Operating v; /rsgb_lf_group-archives/html/rsgb_lf_group/2012-09/msg00616.html (10,862 bytes)
8. Re: LF: MF PA (score: 1): Author: Stefan Schäfer <[email protected]>; Date: Tue, 11 Sep 2012 14:00:21 +0200; Hi Christian, Hi Stefan, Thanks for these infos! This is always helpful because I'm not a really good technican. Everything I built was a mixtiure of my ideas and stuff from the net... Output power i; /rsgb_lf_group-archives/html/rsgb_lf_group/2012-09/msg00698.html (11,449 bytes)
9. LF: MF PA (score: 1): Author: Stefan Schäfer <[email protected]>; Date: Sun, 29 Dec 2013 18:59:40 +0100; Hi Wolf, What type of FETs are you using? The standard IRFPs? Many of them have internal Z diodes, so no addional RC network or Z idode is needed. The losses are there anyway, of course. In some olde; /rsgb_lf_group-archives/html/rsgb_lf_group/2013-12/msg00136.html (15,158 bytes)
10. RE: LF: MF PA (score: 1): Author: Bob Raide <[email protected]>; Date: Sun, 29 Dec 2013 13:24:39 -0500; Stefan; Is this amp shown capable of handling 300 + volts like your 137 amp that I believe is similar in design? Bob > Date: Sun, 29 Dec 2013 18:59:40 +0100 > From: [email protected]; /rsgb_lf_group-archives/html/rsgb_lf_group/2013-12/msg00362.html (15,319 bytes)
11. RE: LF: MF PA (score: 1): Author: Bob Raide <[email protected]>; Date: Sun, 29 Dec 2013 14:55:01 -0500; Stefan; Now that's an amp! 73-Bob > Date: Sun, 29 Dec 2013 19:39:45 +0100 > From: [email protected] > To: [email protected] > Subject: Re: LF: MF PA > > Hi Stefan, > > Hi Wolf, > > > > Wha; /rsgb_lf_group-archives/html/rsgb_lf_group/2013-12/msg00363.html (14,153 bytes)
12. Re: LF: MF PA (score: 1): Author: wolf_dl4yhf <[email protected]>; Date: Sun, 29 Dec 2013 19:39:45 +0100; Hi Stefan, Hi Wolf, What type of FETs are you using? The standard IRFPs? Many of them have internal Z diodes, so no addional RC network or Z idode is needed. The losses are there anyway, of course. I; /rsgb_lf_group-archives/html/rsgb_lf_group/2013-12/msg00594.html (13,834 bytes)
13. Re: LF: MF PA (score: 1): Author: Stefan Schäfer <[email protected]>; Date: Sun, 29 Dec 2013 19:31:56 +0100; Am 29.12.2013 19:24, schrieb Bob Raide: Stefan; Is this amp shown capable of handling 300 + volts like your 137 amp that I believe is similar in design? Bob Hi Bob, Yes it is. 73, Stefan have The poi; /rsgb_lf_group-archives/html/rsgb_lf_group/2013-12/msg00595.html (14,425 bytes)

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