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Message-ID: <005301cbd350$25fdb720$4001a8c0@lark>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <788033577-1298396905-cardhu_decombobulator_blackberry.rim.net-1949347720-@bda644.bisx.prod.on.blackberry> <4D63FF65.2030204@iup.uni-heidelberg.de> <008101cbd2ca$dafdbd40$4001a8c0@lark> <4D64F0FC.9070807@iup.uni-heidelberg.de>
Date: Wed, 23 Feb 2011 11:52:27 -0000
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Subject: Re: LF: Title: Power MOSFET Knock Efficiency Up A Notch
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Hi Stefan, Ah I wasn't thinking of /p operation....you need a mule to=
 carry
more batteries :-))
Alan
G3NYK

----- Original Message -----=20
From: "Stefan Sch=E4fer" <schaefer@iup.uni-heidelberg.de>
To: <rsgb_lf_group@blacksheep.org>
Sent: Wednesday, February 23, 2011 11:35 AM
Subject: Re: LF: Title: Power MOSFET Knock Efficiency Up A Notch


Hi Alan,

In a few weeks i am /p in EI for 7...10 days! I'm thinking about beein=
g
QRV on LF with a "travel-equipment". This might be a 100m kite antenna
and a LF TRX and a 12V PA running at up to 30W out. There would be no
alternative to a 12 V design! Using such a 12V, 7Ah battery would allo=
w
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
voltages
> ....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
>
>
>
>> 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 12VD=
C).
>> Maybe they are difficult to get. An alternative which is easy to ge=
t and
>> is most suitable for a high power class E PA at 12 VDC is the IRF14=
04
>> <http://www.datasheetcatalog.org/datasheet/irf/irf1404.pdf>
>>
>>
>> 73, Stefan/DK7FC
>>
>> Am 22.02.2011 18:48, schrieb kd4wov@earthlink.net:
>>
>>> Could these help in getting the efficiencies higher in LF amps?
>>>
>>> Granted, these are low power devices. Looks like they are on the=
 right
>>>
> track.
>
>>>
>>>
>>>
>>>
>
http://electronicdesign.com/article/power/Power-MOSFET-Knock-Efficienc=
y-Up-A-Notch-.aspx?cid=3Ded_productsnewsletter&NL=3D1&YM_RID=3Dkd4wov@=
earthlink.net
>
>>> Sent via BlackBerry by AT&T
>>>
>>>
>>
>