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Re: [O_P_E_R_A_] Re: LF: VO1NA OP32 137.777 kHz

To: LF Group <[email protected]>
Subject: Re: [O_P_E_R_A_] Re: LF: VO1NA OP32 137.777 kHz
From: [email protected]
Date: Mon, 12 Nov 2012 06:49:53 -0330 (NST)
In-reply-to: <3816C61C35B545F7A7A7E8A1BD2A7CAF@GaryAsus>
References: <[email protected]> <3816C61C35B545F7A7A7E8A1BD2A7CAF@GaryAsus>
Reply-to: [email protected]
Sender: [email protected]

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 tried. It seems this FET had too much gate capacitance for the totem pole driver, hence the 4427. The gate waveform looks a lot better and the heatsink was cool this morning, presumably
because the RDS was lower than that for the IRF640.

The Decca is on standby after a  heart-breaking experience.  More on that
later...

Thanks to you Gary and the others who operate the grabber services.

73
Joe VO1NA


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