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Total 4 documents matching your query.

1. Re: [O_P_E_R_A_] Re: LF: VO1NA OP32 137.777 kHz (score: 1): Author: [email protected]; Date: Mon, 12 Nov 2012 06:49:53 -0330 (NST); GM Gary and Group, Thank-you for the report. The TX was the original 100 watt unit (Jul '05 QST) somewhat modified. After frying many FETS over the past decade, a 4427 driver and IRFP260 hexfet was t; /rsgb_lf_group-archives/html/rsgb_lf_group/2012-11/msg00174.html (9,441 bytes)
2. Re: [O_P_E_R_A_] Re: LF: VO1NA OP32 137.777 kHz (score: 1): Author: Stefan Schäfer <[email protected]>; Date: Mon, 12 Nov 2012 16:02:17 +0100; Hello Joe (VO1NA), If you're doing modifications on your PA FETs, try the IXDD614CI MOSFET driver. I can assure you that gate drive problems are gone then! I use a single IXDD614CI to drive 4x IRFP26; /rsgb_lf_group-archives/html/rsgb_lf_group/2012-11/msg00449.html (10,857 bytes)
3. Re: [O_P_E_R_A_] Re: LF: VO1NA OP32 137.777 kHz (score: 1): Author: [email protected]; Date: Mon, 12 Nov 2012 12:38:32 -0330 (NST); Hi Stefan, Thank-you for the tip. The totem pole worked well for me (thanks to Alan G3NYK) but the waveform was a bit mushy and I suspect it may have contributed to the demise of many FETS as a resul; /rsgb_lf_group-archives/html/rsgb_lf_group/2012-11/msg00649.html (11,378 bytes)
4. Re: [O_P_E_R_A_] Re: LF: VO1NA OP32 137.777 kHz (score: 1): Author: "Gary - G4WGT" <[email protected]>; Date: Mon, 12 Nov 2012 09:35:21 +0100; Hi Joe & All, Results from my overnight monitoring on 137.777kHz. 06:04 136 VO1NA de G4WGT Op32 3517 km -39 dB in Chorley, IO83qo 03:52 136 VO1NA de G4WGT Op32 3517 km -33 dB in Chorley, IO83qo 03:19; /rsgb_lf_group-archives/html/rsgb_lf_group/2012-11/msg00651.html (18,100 bytes)

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