Hello Stefan,LF
The tx is still on,freq.8.970.025Khz, power 100 Wat,but there is no radio
amateur around,so the step to your grabber,(396km) is to big,
henny pa3cpm
73's
----- Original Message -----
From: "Stefan Schäfer" <[email protected]>
To: <[email protected]>
Sent: Wednesday, February 23, 2011 12:35 PM
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]
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