Re: LF: On air again in LF WSPR-15

[Chris Wilson <dead.fets@gmail.com>]

Hello DK7FC,

Is  the  H bridge amp a published design Stefan, and if not, would you
consider posting it please? :)

Wednesday, November 21, 2018, 1:00:23 PM, you wrote:

>    
>  Hi Luis, 
>  
>  thanks for the nice readably summary report. 
>  Oh yes it was an impressing night and good resultsfor us. I saw
> you were decoded at SM2DJK which is a good distance, and R7NT was
> seen at 2E0ILY. There are more challenges like the path from EB8ARZ
> to SM2DJK, that would be about 4000 km and still inside the continent.
>  I also thought about LU8YD but also about PY2PLL.
>  EB8ARZ has the perfect RX location, so if LU8YD would transmit on
> LF, like in the past, it could work in WSPR-15 just before the sunrise in EA8.
>  
>  About the MOSFET discussion, i'm using IRFP460A types in H bridge
> configurations from SLF to MF, i.e. the full spectrum :-) Bridge
> voltage is 320 V DC, the rectified mains voltage.
>  With the currently pair (4 pcs) of FETs i'm TXing since hundreds
> of hours on LF without problems. They are of course in TO-247 design
> and cost just 2.2 EUR, so a BANG/year wouldn't really hurt.
>  
>  73, Stefan


-- 
Best regards,
 Chris                            mailto:dead.fets@gmail.com