[Amps] LDMOS availability

Gary K9GS garyk9gs at wi.rr.com
Tue Jun 6 19:19:15 EDT 2017 

So did you keep the transmitter Merv??  :)


On 6/6/2017 5:42 PM, Merv Schweigert via Amps wrote:
> Cant quote you the device numbers,  but have seen KW plus MOSFETS 
> around since the
> middle to late 1990s.    When I purchased this AM station property 
> there was a Harris
> 50KW chugging along,  it used 50 MOSFET modules,  50 for RF and 50 for 
> modulation.
> plug in boards and would auto adjust if a module went down,  it kept 
> running fine at
> lower power.
> Commercial use has existed for some time.  perhaps price and class of 
> service was not
> conducive to amateur use,  but they have been around.
> By the way the Harris 50KW ran 85 to 90 percent efficient,  thats 
> power line in to power out.
>
> 73 Merv K9FD/KH6
>
>> OK, name some 1400W solid state devices and they're first date of 
>> manufacture. Seems to me they didn't exist until a few years ago.
>>
>> You don't like solid state....we get it.
>> People didn't like cars and tractors much when they drove horses out 
>> to pasture either.
>>
>> On 6/5/2017 9:54 PM, w8hw at comcast.net wrote:
>>> Larry,
>>>
>>> You made and proved my point for me. The transistor you mention is 
>>> NOT an 1400 watt class (as I specified in the email) in fact your 
>>> transistor is not even close, it is closer to 140 watt out (if 
>>> memory serves) That makes your statement off by a factor of 10. You 
>>> asked me to be careful, I was very carful to specify 1400 watt class 
>>> in my email.
>>>
>>> Thank you , Bruce, W8HW
>>> ====================
>>>
>>> -----Original Message----- From: Larry Benko
>>> Sent: Monday, June 05, 2017 20:40
>>> To: amps at contesting.com
>>> Subject: Re: [Amps] LDMOS availability
>>>
>>> Bruce,
>>>
>>> The MRF-150 came out in 1983/84 and Helge Granberg produced the 
>>> Motorola
>>> app not EB-104 using the XRF-150 in the same year.  It is still readily
>>> available.  Be careful with your FACTS!
>>>
>>> Larry, W0QE
>>>
>>>
>>> On 6/5/2017 5:12 PM, w8hw at comcast.net wrote:
>>>> Actually you do NOT have your crystal ball to predict the future so 
>>>> your statement is NOT based in fact, only an opinion. I prefer to 
>>>> go with facts, so hear we go.
>>>>
>>>> FACT... Because we can not see into the future, we only have 
>>>> history to look at.
>>>>
>>>> FACT... History has shown us that RF power devices have NOT 
>>>> survived 15 years of manufacture very well... IN FACT... I 
>>>> challenge you to show me the facts. Show me a solid state RF 
>>>> transistor in that power class (RF 1400 watts out) that has been in 
>>>> production for 15 years and is still in production today. I am open 
>>>> minded and would love to see your report.
>>>>
>>>> FACT... I noticed that you did not mention if they agree to the 
>>>> $100k Guarantee. Why is that important, see below.
>>>>
>>>> FACT... If they are sure that they will keep production going until 
>>>> the year 2032 (15 years), then that guarantee should BE NO PROBLEM 
>>>> for them. Talk is cheep
>>>>
>>>> FACT... If you feel that is an unfair request, then that tells us 
>>>> that (Deep down) you do not believe them either. Please do not tell 
>>>> me that you DO have a crystal ball.
>>>>
>>>> FACT... Many high power tubes (8877 and 3-500) do have a rich 40+ 
>>>> year history with no end in sight.
>>>>
>>>> FACT... I have purchased the BLF188 because I CAN afford both the 
>>>> cost and the risk. However people who can not afford the cost and 
>>>> risk may wish to take this into consideration.
>>>>
>>>> FACT... I have been in the RF repair industry since 1971 and have 
>>>> seen and faced this issue happen over and over again. How long have 
>>>> you been in it???
>>>>
>>>> 73, Bruce, W8HW
>>>> ============================
>>>>
>>>> -----Original Message----- From: Per Molund
>>>> Sent: Monday, June 05, 2017 14:55
>>>> To: w8hw at comcast.net ; amps at contesting.com ; Tom Thompson
>>>> Subject: Re: [Amps] LDMOS availability
>>>>
>>>> Actually they have put it in writing, on the data sheet (although
>>>> prelimenary at the moment) they state 'Included in NXP product
>>>> longevity program with assured supply for a minimum of 15 years after
>>>> launch' which I see as a quite firm commitment. Or do You have an
>>>> example that NXP has not fullfilled their 'longevity program'
>>>> commitment for some components?
>>>>
>>>> 73 de LA9XKA - Per
>>>>
>>>>
>>>> At 19:08 05.06.2017, w8hw at comcast.net wrote:
>>>>> Talk is cheep. Ask them if they will put that in writing? Also ask 
>>>>> if they will put a penalty clause stating they will give you a 
>>>>> $100k payment should they fail the 15 year test. After all if it 
>>>>> was true, they should have no problems with that. On the other 
>>>>> hand if they baulk , that tells you that they are just talk with 
>>>>> no truth. Additionally, Please be honest... If you are reluctant 
>>>>> to ask them for that guarantee, that shows that you KNOW they are 
>>>>> just talk. Someone or Anyone let me know if anyone gets that 
>>>>> guarantee.
>>>>>
>>>>> Remember company plans do change with new management or when they 
>>>>> get a bad P&L. This is especially true if they are listed on any 
>>>>> exchange such as NASDAQ. Like the dip in early 2016 (NXPI at $65) 
>>>>> and now back on a good clime this year ($109.00) now. companies 
>>>>> tend to make strong claims on the peek and pull claims back claims 
>>>>> on the stock dip. Often they have no choice. The device market 
>>>>> history is the only good indicator. Solid State RF power devices 
>>>>> still have a very poor history. Translation... the market speaks 
>>>>> with authority, companies just talk.
>>>>>
>>>>> I have a solid state amp (dual BLF188) homebrew amp, and have two 
>>>>> (2) tube amps one of which is AL-1500 with 8877 tube. I love them 
>>>>> all, but understand the risk of SS replacement as I have been in 
>>>>> broadcasting or the RF repair business since 1971 and a Ham since 
>>>>> 1962. I have lived through everything that I have said above.
>>>>>
>>>>> 73, Bruce, W8HW
>>>>> ============================
>>>>
>>>>> -----Original Message----- From: Tom Thompson
>>>>> Sent: Monday, June 05, 2017 11:18
>>>>> To: amps at contesting.com
>>>>> Subject: [Amps] LDMOS availability
>>>>>
>>>>> I recently took part in a webinar on the new, 1800 watt, 65 volt, 
>>>>> LDMOS
>>>>> transistors made by NXP.  It is the MRFX1K80, and NXP plans to 
>>>>> produce
>>>>> it for at least 15 years.
>>>>>
>>>>> Tom   W0IVJ
>>>>> _______________________________________________
>>>>> Amps mailing list
>>>>> Amps at contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>> _______________________________________________
>>>>> Amps mailing list
>>>>> Amps at contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>>
>>>>>
>>>>>
>>>>> ---
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>>>>> http://www.avg.com
>>>>
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>>>
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>>
>
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-- 
73,

Gary K9GS

Greater Milwaukee DX Association: http://www.gmdxa.org
Society of Midwest Contesters: http://www.w9smc.com
CW Ops #1032   http://www.cwops.org

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