If it will do 1200W average power CW it should do the same in pulsed mode.
The question is, why list both unless some application requires that particular
pulse specification. It could be that the product was targeted for that
application.
And others (CW).
73
Bill wa4lav
________________________________________
From: amps-bounces@contesting.com [amps-bounces@contesting.com] On Behalf Of
Roger (sub1) [sub1@rogerhalstead.com]
Sent: Sunday, August 21, 2011 10:26 AM
To: Peter Frenning [OZ1PIF]
Cc: amps@contesting.com
Subject: Re: [Amps] MRFE6VP Datasheet
On 8/21/2011 5:18 AM, Peter Frenning [OZ1PIF] wrote:
> Den 21-08-2011 10:54, Roger (sub1) skrev:
>> On 8/21/2011 3:56 AM, David Shapiro wrote:
>>> Someone requested the datasheet.
>>>
>>>
>> This causes me to reflect on that 1200 watt output rating a bit. They
>> emphasize that the 1200 watts is "pulsed" at 100 uSec width and 20% duty
>> cycle. Then they also list 1200 W out CW. I don't see how they can get
>> both.
>>
>> On the positive side they do operate with a case temp as high as 150C.
>> BUT they also say they higher the case temp the shorter meantime between
>> failures. It also appears to be operating class C.
>>
>> I've not taken the time to really look at the curves, but it appears at
>> a glance that to operate one in a linear fashion would only result in a
>> few hundred watts out per device. So, using them as most devices are
>> presently used in amateur service (4 in PP parallel) would give about a
>> KW out at a cost of about $1,000 in devices, not counting other components.
>>
>> Devices are improving and great strides have been made, but those I've
>> talked with who have reached the testing stages found their main
>> roadblocks were cooling. The small heat transfer area of the device
>> makes it difficult to get a decent transfer and keep the delta T down to
>> a point where the device does not self destruct.
>>
>> 73
>>
>> Roger (K8RI)
>>
> Some data points to ponder can be found here:
> http://www.frenning.dk/OZ1PIF_HOMEPAGE/LDMOS_SSPA.html describing my
> newly "almost completed" 144MHz amp using this device (singly). I run
> it fairly conservatively at ~900W out with good reports and so so
> measuments.
>
Very nice looking piece of work.
73
Roger (K8RI)
> --
> Vy 73 de OZ1PIF/5Q2M, Peter
>
> *****************************************
> ** Genius is one per cent inspiration, **
> ** and ninety-nine per cent **
> ** perspiration. **
> ** -- Thomas A. Edison **
> *****************************************
> email: peter(no-spamfiller)@frenning.dk
> http://www.frenning.dk/oz1pif.htm
> Ph. +45 4619 3239
> Snailmail:
> Peter Frenning
> Ternevej 23
> DK-4130 Viby Sj.
> Denmark
> *****************************************
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|