Larry, the Microsemi VRF2933 has a 170 Volt VDD breakdown voltage and 648
Watt power dissipation, and when operated with a 48 V rail there's plenty of
safety headroom for potentially damaging high voltage excursions. I've never
had a failure of these rugged and virtually bullet-proof devices.
Leigh
VK5KLT
-----Original Message-----
From: Larry [mailto:larry@w7iuv.com]
Sent: Wednesday, 11 September 2013 11:38 PM
To: Leigh Turner
Subject: Re: [Amps] Future of RF AMPS
Leigh,
Thanks for that info.
There are some used ones on ebay right now but used transistors scare me.
I was hoping for a lead on some of the later generation devices which
are spec'd to survive 60:1 SWR or so.
73, Larry - W7IUV
On 10-Sep-13 8:13 PM, Leigh Turner wrote:
>
> Larry, the RF power MOSFETS to which I refer here are the VRF2933 devices
> from Microsemi. Sometimes one can find surplus and NOS ST Micro SD2933
> FETS on eBay at low prices.
>
> 4 of these rugged 300 Watt rated devices in parallel/push-pull will yield
> a saturated output power of well over 1200 Watts. Six will comfortably
> yield over the US legal limit.
>
> 73
>
> Leigh
> VK5KLT
>
> -----Original Message-----
> From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Larry
> Sent: Wednesday, 11 September 2013 10:48 AM
> To: amps@contesting.com
> Subject: Re: [Amps] Future of RF AMPS
>
> On 10-Sep-13 5:51 PM, Leigh Turner wrote: using a readily available
> multiplicity (6 devices in parallel/push-pull) of cheap 50V RF MOSFETS
> sourced from the surplus market.
>
>
> Leigh,
>
> Exactly which cheap MOSFETS from what surplus market are you speaking of?
>
> Larry - W7IUV
>
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>
>
>
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