Hi Stefan, Ah I wasn't thinking of /p operation....you need a mule to carry
more batteries :-))
Alan
G3NYK

----- Original Message ----- 
From: "Stefan Schäfer" <[email protected]>
To: <[email protected]>
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 beeing
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 allow
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 Schäfer"<[email protected]>
> To:<[email protected]>
> 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 12VDC).
>> Maybe they are difficult to get. An alternative which is easy to get and
>> 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 [email protected]:
>>
>>> 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-Efficiency-Up-A-Notch-.aspx?cid=ed_productsnewsletter&NL=1&[email protected]
>
>>> Sent via BlackBerry by AT&T
>>>
>>>
>>
>