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Author Topic: IRF510/530 as 6m Power amp  (Read 3985 times)
PP2KR
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Posts: 1




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« on: September 10, 2001, 10:02:14 AM »

hi all.
I would like know if somebody have a circuit/info for a 50mhz rf Power Amplifier using IRF510/530.

Tnx to help.
Kleibe
PP2KR
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K5OOR
Member

Posts: 11


WWW

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« Reply #1 on: April 16, 2005, 09:12:34 PM »

The IRF510 dies above 30Mhz. It is good for HF however.
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PE1NWC
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Posts: 1




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« Reply #2 on: February 02, 2006, 06:26:09 AM »

Sorry to disappoint you,Virgil !!
Was looking for the same as Kleibe : a 6 meter amp using the IRF510.
Up till now,I've only found a 250 W design ( http://home24.inet.tele.dk/oz1pif/50MHz_IRF510.htm).
Looks great,but I was planning a 10-25W amp behind a transverter.
Anyone got an idea or schematic?

Thanx in advance,

   Vic

PE1NWC
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KB1GMX
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Posts: 1799




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« Reply #3 on: February 21, 2019, 12:57:52 PM »

I have two designs that work well beyond 30mhz.
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KB1GMX
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Posts: 1799




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« Reply #4 on: February 21, 2019, 01:09:49 PM »

Happened to trip on this in an archive. Hence the last positing.

PZ1PIF has a high power amp  for 6M.  He uses 8 IRF510 in a 4x4 push pull.

More recent QRPlabs sells a integrated amp (26db gain driver and output)
using BS170s and IRF510 for 10W at 13V and gain flat to 30mhz and
useful to well beyond 50mhz.

There are a lot of people that believe the device is incapable of gain at VHF
and its not only capable it is one of the reasons the sloppier designs blow
up as they takes off at VHF and burn up.  Mostly because they don't treat
it as such.

The gain is that but designs that treat the gate as high impedance will fail.
Also the output of the device only delivers power at low impedance.
Combine that with the long leads and loose layout its a power oscillator.

Allison



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G4ZOW
Member

Posts: 118




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« Reply #5 on: February 23, 2019, 02:31:31 AM »

Kleibe,

I found this from a Dutch amateur: http://members.ziggo.nl/pa1apw/homebrew/pa/400.html

Use Google translate.

Scroll all the way down to find some links.

David  G4ZOW
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VK4FFAB
Member

Posts: 480




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« Reply #6 on: February 28, 2019, 03:36:08 PM »

I have two designs that work well beyond 30mhz.

Care to share them Allison?
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KB1GMX
Member

Posts: 1799




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« Reply #7 on: March 01, 2019, 09:33:14 AM »

No, the board lay out is propitiatory.

Many of the schematics out there are correct but the mechanical
builds with long leads and sloppy layout are the fail.  IF you look
you will find them as they look more like they were designed for
VHF...  

Look at OZ1PIF, (K5oor/Wa2eby) HFpacker, QRPlabs 10W linear amp
as examples.  They all pay attention to layout.


Allison
« Last Edit: March 01, 2019, 09:35:49 AM by KB1GMX » Logged
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