Message-ID: <4D64F0FC.9070807@iup.uni-heidelberg.de>
Date: Wed, 23 Feb 2011 12:35:24 +0100
From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= <schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: Title: Power MOSFET Knock Efficiency Up A Notch
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Hi Alan,

In a few weeks i am /p in EI for 7...10 days! I'm thinking about beeing=20
QRV on LF with a "travel-equipment". This might be a 100m kite antenna=20
and a LF TRX and a 12V PA running at up to 30W out. There would be no=20
alternative to a 12 V design! Using such a 12V, 7Ah battery would allow=20
some hours of TX activity! :-)

73, Stefan/DK7FC

Am 22.02.2011 20:52, schrieb Alan Melia:
> Why stick to 12v ?? Best efficiency will always be at higher supply volt=
ages
> ....also more tractable output impedances.
> Alan G3NYK
> ----- Original Message -----
> From: "Stefan Sch=E4fer"<schaefer@iup.uni-heidelberg.de>
> To:<rsgb_lf_group@blacksheep.org>
> Sent: Tuesday, February 22, 2011 6:24 PM
> Subject: Re: LF: Title: Power MOSFET Knock Efficiency Up A Notch
>
>
>   =20
>> These FETs can be used as a very low-loss electronic switch in 12V
>> circuits but are not suitable for a easy PA design (running at 12VDC).
>> Maybe they are difficult to get. An alternative which is easy to get an=
d
>> is most suitable for a high power class E PA at 12 VDC is the IRF1404
>> <http://www.datasheetcatalog.org/datasheet/irf/irf1404.pdf>
>>
>>
>> 73, Stefan/DK7FC
>>
>> Am 22.02.2011 18:48, schrieb kd4wov@earthlink.net:
>>     =20
>>> Could these help in getting the efficiencies higher in LF amps?
>>>
>>> Granted, these are low power devices. Looks like they are on the right
>>>       =20
> track.
>   =20
>>>
>>>
>>>
>>>       =20
> http://electronicdesign.com/article/power/Power-MOSFET-Knock-Efficiency-=
Up-A-Notch-.aspx?cid=3Ded_productsnewsletter&NL=3D1&YM_RID=3Dkd4wov@earthl=
ink.net
>   =20
>>> Sent via BlackBerry by AT&T
>>>
>>>       =20
>>     =20
>   =20