[Amps] LDMOS availability

Tue Jun 6 18:42:42 EDT 2017

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
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>>>>
>>>>
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>>>
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>>
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