Re: LF: DK7FC, DF6NM nr Moscow

[Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>]

Mal,

I can forget about my SMPS now. Secondary rectifier diodes were 
shortcutted and as a result the primary switching FET got damaged. There 
is a shortcut to the gate now so i assume the FET driver is damaged too. 
To much effort now to repair that since special PFC ICs are used which 
are not easy available. I'll take a new one and prepare that for 13.8 V 
again.
Apart from that i will use the acual supply now which is a SMPS too, 
adjustable from 0...320 VDC.
Will be on air soon again..

73, Stefan/DK7FC

Am 13.09.2011 11:52, schrieb mal hamilton:
> Stefan
> I use a Linear PSU which I find convenient because on the Primary side I use
> a variac and I can control my voltage output from 0 to 65 Voltss
> I know some SMPSU'S allow voltage variations but most do not.
> The advantage of the smpsu is Size compared to a Linear psu.
> I suppose there are better ways if the mains PSU,  is incorporated with the
> amplifier design. Portable stations many variations
> de g3kev
>
> ----- Original Message -----
> From: "Stefan Schäfer"<Stefan.Schaefer@iup.uni-heidelberg.de>
> To:<rsgb_lf_group@blacksheep.org>
> Sent: Monday, September 12, 2011 6:55 PM
> Subject: Re: LF: DK7FC, DF6NM nr Moscow
>
>
>
> Am 12.09.2011 19:42, schrieb Stefan Schäfer:
>    
> > PS: Will try again TXing to the far west later at 18:30 UTC.
> >
> >      
> The SMPS has a fault again :-/ I am to close to the power limit and a
> SMPS as a load of a SMPS always keeps the supplying SMPS on its current
> limiting, which fails after some time...
>
> 73, Stefan
>
>
>