[Amps] LDMOS availability

Merv Schweigert k9fd at flex.com
Tue Jun 6 20:12:35 EDT 2017 

The solid state MW50 was moved to GA to a station there,  I kept the old 
tube
MW50,  it used 4cx35000 tubes,  and parted it out.   Junked the HV 
tranny as it
was starting to leak oil and was PCB infected.  Still have the 600amp 3 
phase service.
Cut down the 300 ft towers,  they were rusting,  kept the radial systems 
and coax
feeds etc.  station was 830KHZ KAIM 50KW.   Gone now about 9 or 10 years.
Run QRP with Alpha 99 and AL-1500.

Merv


> 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
>>>>>>
>>>>>>
>>>>>>
>>>>>> ---
>>>>>> This email has been checked for viruses by AVG.
>>>>>> http://www.avg.com
>>>>>
>>>>> _______________________________________________
>>>>> 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
>>>> _______________________________________________
>>>> 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
>

More information about the Amps mailing list