[VHFcontesting] [Mw] How do you know if an MRF-247 is real?

[John D'Ausilio]

I ran across a manufacturer, ASI, which is evidently manufacturing
many obsolete Motorola parts. They quoted me $50/ea with 10 pc
minimum. Anyone ever heard of these guys or seen their parts around?

http://www.advancedsemiconductor.com/pdf/mrf247.pdf

de w1rt/john

On Sun, Apr 17, 2011 at 1:31 PM, Mike & Becca Krzystyniak
<k9mk at flash.net> wrote:
>   Last ship date of MRF-247's was November 2003.   Date codes after that
> are most likely counterfeit.
>
>   The MRF-247 was one off the highest running RFR power parts Moto-Semi
> (now Freescale) made.  Another option is the Motorola in house number,
> which was 4884411L04. They were screened to a slightly higher standard than
> the generic MRF-247 and can often be found at a better price.  On the street
> they are simply marked as M1104 or M11L04.
>
>   Regarding soft failures in amps (where one part is known dead instead of
> the pair or a quad set, if the power is less than half rated, odds are the
> alternate part(s) is damaged too.  Another factor is how long one might have
> tried to use the amp with the damaged part or parts.  Good luck with it...
>
> 73 Mike K9MK
>
>
>
>
> -----Original Message-----
> From: vhfcontesting-bounces at contesting.com
> [mailto:vhfcontesting-bounces at contesting.com] On Behalf Of Mike Benonis
> Sent: Thursday, April 14, 2011 11:51 PM
> To: VHF Contesting Reflector
> Subject: Re: [VHFcontesting] [Mw] How do you know if an MRF-247 is real?
>
> This is a good question that I had as well.  I just bought a 180W 2m
> amplifier that I know will need a new MRF247, and I'm wondering whether to
> buy one or two on eBay, or get the new 2SC series replacement part as a pair
> from RFParts.com...
>
> Mike
>
>
> On 14 Apr 2011, at 21:01 , John T Rose wrote:
>
>> It isn't just counterfeit parts to watch out for.  At times a large
>> quantity of the parts that failed to meet specification gets out to the
>> market.  Some thing I am suffering through at work.  An older design with
>> an IC that was last made 6 years ago.   Some of the rework people cringe
>> when I head in their direction!
>> On Thu, 14 Apr 2011 15:22:14 -0500 "Mike & Becca Krzystyniak"
>> <k9mk at flash.net> writes:
>>> I looked at the item on eBay and they pass the common sense test but
>>> I have
>>> heard rumors of counterfit parts coming from China where performance
>>> was off
>>> from the branded part.
>>>
>>> The MRF-247's were built in Malaysia from 1999 through 2003 and the
>>> last
>>> ship date was around week 47 of 2003.
>>>
>>> So if these are legitimate MRF247's they were made in the one of the
>>> last
>>> production runs.
>>>
>>> 73's  Mike K9MK
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: microwave-bounces at lists.valinet.com
>>> [mailto:microwave-bounces at lists.valinet.com] On Behalf Of John
>>> D'Ausilio
>>> Sent: Thursday, April 14, 2011 2:45 PM
>>> To: Microwave; (Radio) VHF Contesting
>>> Subject: [Mw] How do you know if an MRF-247 is real?
>>>
>>> for instance, item 180557984917 on ebay .. too good to be true?
>>> I've
>>> got a Mirage and a TE, both with bad transistors, that I'd love to
>>> get
>>> working again .. I wouldn't touch the "UK" variety, but how does
>>> one
>>> tell if a Motorola-marked part is real or not?
>>>
>>> de w1rt/john
>>> _______________________________________________
>>> Microwave mailing list
>>> microwave at lists.valinet.com
>>> http://lists.valinet.com/cgi-bin/mailman/listinfo/microwave
>>>
>>> _______________________________________________
>>> Microwave mailing list
>>> microwave at lists.valinet.com
>>> http://lists.valinet.com/cgi-bin/mailman/listinfo/microwave
>>>
>>
>>
>> ____________________________________________________________
>> Get Free Email with Video Mail & Video Chat!
>> http://www.juno.com/freeemail?refcd=JUTAGOUT1FREM0210
>> _______________________________________________
>> VHFcontesting mailing list
>> VHFcontesting at contesting.com
>> http://lists.contesting.com/mailman/listinfo/vhfcontesting
>
> Best regards,
>
> Mike Benonis
> mike at benonis.net
> KI4RIX
>
> _______________________________________________
> VHFcontesting mailing list
> VHFcontesting at contesting.com
> http://lists.contesting.com/mailman/listinfo/vhfcontesting
>
> _______________________________________________
> VHFcontesting mailing list
> VHFcontesting at contesting.com
> http://lists.contesting.com/mailman/listinfo/vhfcontesting
>