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Could the be the basis for the KPA-1500?

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Gary K9GS

Could the be the basis for the KPA-1500?

There has been an ongoing discussion on the AMPS reflector regarding the
Freescale LDMOS devices currently on the market. A pair of these in an
HF amp with a 48V SMPS would be an excellent start.....(hint,
hint...KPA-1500). I wish I was retired and had some time on my hands :)

Check this out:

http://www.w6pql.com/1_kw_2m_ldmos_amplifier.htm

Also see:

Some YouTube videos...
http://www.youtube.com/watch?v=02v58cnb41o&feature=relmfu
http://www.youtube.com/watch?v=-EACUpIhpac

F1JRD also has an article in Dubus
http://www.qsl.net/f1jrd/MRFE6VP61K25H.html
http://www.w6pql.com/1_kw_2m_ldmos_amplifier.htm

--

73,

Gary K9GS

Check out K9NS on the web: http://www.k9ns.com
Greater Milwaukee DX Association: http://www.gmdxa.org
Society of Midwest Contesters: http://www.w9smc.com

************************************************
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Jack Chomley

Re: Could the be the basis for the KPA-1500?

We do NOT need any more big amplifiers, they are the reason the sunspot
cycles have been worn out :-)

73, Jack VK4JRC

On Sun, Jul 24, 2011 at 1:28 PM, Gary K9GS <[hidden email]> wrote:

> There has been an ongoing discussion on the AMPS reflector regarding the
> Freescale LDMOS devices currently on the market. A pair of these in an
> HF amp with a 48V SMPS would be an excellent start.....(hint,
> hint...KPA-1500). I wish I was retired and had some time on my hands :)
>
> Check this out:
>
> http://www.w6pql.com/1_kw_2m_ldmos_amplifier.htm
>
> Also see:
>
> Some YouTube videos...
> http://www.youtube.com/watch?v=02v58cnb41o&feature=relmfu
> http://www.youtube.com/watch?v=-EACUpIhpac
>
> F1JRD also has an article in Dubus
> http://www.qsl.net/f1jrd/MRFE6VP61K25H.html
> http://www.w6pql.com/1_kw_2m_ldmos_amplifier.htm
>
>
> --
>
>
> 73,
>
> Gary K9GS
>
> Check out K9NS on the web: http://www.k9ns.com
> Greater Milwaukee DX Association: http://www.gmdxa.org
> Society of Midwest Contesters: http://www.w9smc.com
>
>
>

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Olli Tuppurainen

Re: Could the be the basis for the KPA-1500?

Here is one alternative for HF + 6m

http://www.nikkemedia.fi/juma-pa1000/

Olli
OH6CT

> -----Alkuperäinen viesti-----
> Lähettäjä: [hidden email] [mailto:elecraft-
> [hidden email]] Puolesta Jack Chomley
> Lähetetty: 24. heinäkuuta 2011 6:44
> Vastaanottaja: [hidden email]
> Kopio: [hidden email]
> Aihe: Re: [Elecraft] Could the be the basis for the KPA-1500?
>
> We do NOT need any more big amplifiers, they are the reason the sunspot
> cycles have been worn out :-)
>
> 73, Jack VK4JRC
>
> On Sun, Jul 24, 2011 at 1:28 PM, Gary K9GS <[hidden email]> wrote:
>
> > There has been an ongoing discussion on the AMPS reflector regarding
> > the Freescale LDMOS devices currently on the market. A pair of these
> > in an HF amp with a 48V SMPS would be an excellent start.....(hint,
> > hint...KPA-1500). I wish I was retired and had some time on my hands

> >
> > Check this out:
> >
> > http://www.w6pql.com/1_kw_2m_ldmos_amplifier.htm
> >
> > Also see:
> >
> > Some YouTube videos...
> > http://www.youtube.com/watch?v=02v58cnb41o&feature=relmfu
> > http://www.youtube.com/watch?v=-EACUpIhpac
> >
> > F1JRD also has an article in Dubus
> > http://www.qsl.net/f1jrd/MRFE6VP61K25H.html
> > http://www.w6pql.com/1_kw_2m_ldmos_amplifier.htm
> >
> >
> > --
> >
> >
> > 73,
> >
> > Gary K9GS
> >
> > Check out K9NS on the web: http://www.k9ns.com Greater Milwaukee DX
> > Association: http://www.gmdxa.org Society of Midwest Contesters:
> > http://www.w9smc.com
> >
> >
> >
> __________________________________________________________
> ____
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

Gary K9GS

Re: Could the be the basis for the KPA-1500?

Hello Olli,

It's a start but really needs two devices.

Any idea what the cost is?

On 7/24/2011 8:07 AM, Olli Tuppurainen wrote:

> Here is one alternative for HF + 6m
>
> http://www.nikkemedia.fi/juma-pa1000/
>
>
> Olli
> OH6CT
>
>> -----Alkuperäinen viesti-----
>> Lähettäjä: [hidden email] [mailto:elecraft-
>> [hidden email]] Puolesta Jack Chomley
>> Lähetetty: 24. heinäkuuta 2011 6:44
>> Vastaanottaja: [hidden email]
>> Kopio: [hidden email]
>> Aihe: Re: [Elecraft] Could the be the basis for the KPA-1500?
>>
>> We do NOT need any more big amplifiers, they are the reason the sunspot
>> cycles have been worn out :-)
>>
>> 73, Jack VK4JRC
>>
>> On Sun, Jul 24, 2011 at 1:28 PM, Gary K9GS<[hidden email]> wrote:
>>
>>> There has been an ongoing discussion on the AMPS reflector regarding
>>> the Freescale LDMOS devices currently on the market. A pair of these
>>> in an HF amp with a 48V SMPS would be an excellent start.....(hint,
>>> hint...KPA-1500). I wish I was retired and had some time on my hands
> :)
>>> Check this out:
>>>
>>> http://www.w6pql.com/1_kw_2m_ldmos_amplifier.htm
>>>
>>> Also see:
>>>
>>> Some YouTube videos...
>>> http://www.youtube.com/watch?v=02v58cnb41o&feature=relmfu
>>> http://www.youtube.com/watch?v=-EACUpIhpac
>>>
>>> F1JRD also has an article in Dubus
>>> http://www.qsl.net/f1jrd/MRFE6VP61K25H.html
>>> http://www.w6pql.com/1_kw_2m_ldmos_amplifier.htm
>>>
>>>
>>> --
>>>
>>>
>>> 73,
>>>
>>> Gary K9GS
>>>
>>> Check out K9NS on the web: http://www.k9ns.com Greater Milwaukee DX
>>> Association: http://www.gmdxa.org Society of Midwest Contesters:
>>> http://www.w9smc.com
>>>
>>>
>>>
>> __________________________________________________________
>> ____
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

--

73,

Gary K9GS

Check out K9NS on the web: http://www.k9ns.com
Greater Milwaukee DX Association: http://www.gmdxa.org
Society of Midwest Contesters: http://www.w9smc.com

************************************************

______________________________________________________________
Elecraft mailing list
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Olli Tuppurainen

Re: Could the be the basis for the KPA-1500?

I have not seen any cost indications yet

Olli
OH6CT

> -----Alkuperäinen viesti-----
> Lähettäjä: [hidden email] [mailto:elecraft-
> [hidden email]] Puolesta Gary K9GS
> Lähetetty: 24. heinäkuuta 2011 17:48
> Vastaanottaja: [hidden email]
> Aihe: Re: [Elecraft] Could the be the basis for the KPA-1500?
>
> Hello Olli,
>
> It's a start but really needs two devices.
>
> Any idea what the cost is?
>
>
>
> On 7/24/2011 8:07 AM, Olli Tuppurainen wrote:
> > Here is one alternative for HF + 6m
> >
> > http://www.nikkemedia.fi/juma-pa1000/
> >
> >
> > Olli
> > OH6CT
> >
> >> -----Alkuperäinen viesti-----
> >> Lähettäjä: [hidden email] [mailto:elecraft-
> >> [hidden email]] Puolesta Jack Chomley
> >> Lähetetty: 24. heinäkuuta 2011 6:44
> >> Vastaanottaja: [hidden email]
> >> Kopio: [hidden email]
> >> Aihe: Re: [Elecraft] Could the be the basis for the KPA-1500?
> >>
> >> We do NOT need any more big amplifiers, they are the reason the
> >> sunspot cycles have been worn out :-)
> >>
> >> 73, Jack VK4JRC
> >>
> >> On Sun, Jul 24, 2011 at 1:28 PM, Gary K9GS<[hidden email]> wrote:
> >>
> >>> There has been an ongoing discussion on the AMPS reflector regarding
> >>> the Freescale LDMOS devices currently on the market. A pair of
> >>> these in an HF amp with a 48V SMPS would be an excellent

start.....(hint,
> >>> hint...KPA-1500). I wish I was retired and had some time on my
hands

> > :)
> >>> Check this out:
> >>>
> >>> http://www.w6pql.com/1_kw_2m_ldmos_amplifier.htm
> >>>
> >>> Also see:
> >>>
> >>> Some YouTube videos...
> >>> http://www.youtube.com/watch?v=02v58cnb41o&feature=relmfu
> >>> http://www.youtube.com/watch?v=-EACUpIhpac
> >>>
> >>> F1JRD also has an article in Dubus
> >>> http://www.qsl.net/f1jrd/MRFE6VP61K25H.html
> >>> http://www.w6pql.com/1_kw_2m_ldmos_amplifier.htm
> >>>
> >>>
> >>> --
> >>>
> >>>
> >>> 73,
> >>>
> >>> Gary K9GS
> >>>
> >>> Check out K9NS on the web: http://www.k9ns.com Greater Milwaukee
> DX
> >>> Association: http://www.gmdxa.org Society of Midwest Contesters:
> >>> http://www.w9smc.com
> >>>
> >>>
> >>>
> >>
> __________________________________________________________
> >> ____
> >> Elecraft mailing list
> >> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> >> Help: http://mailman.qth.net/mmfaq.htm
> >> Post: mailto:[hidden email]
> >>
> >> This list hosted by: http://www.qsl.net Please help support this
> >> email list: http://www.qsl.net/donate.html
> >
> __________________________________________________________
> ____
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net Please help support this email
> > list: http://www.qsl.net/donate.html
> >
>
> --
>
>
> 73,
>
> Gary K9GS
>
> Check out K9NS on the web: http://www.k9ns.com Greater Milwaukee DX
> Association: http://www.gmdxa.org Society of Midwest Contesters:
> http://www.w9smc.com
>
> ************************************************
>
> __________________________________________________________
> ____
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

Gary K9GS

Re: Could the be the basis for the KPA-1500?

One thing that someone pointed off off list.....

By having the amplifier and power supply on one board, if the power
supply fails catastrophically, you have a lot of very expensive RF
components attached to a burned up PCB. Separate PCBs would be a good idea.

On 7/24/2011 10:10 AM, Olli Tuppurainen wrote:

> I have not seen any cost indications yet
>
> Olli
> OH6CT
>
>> -----Alkuperäinen viesti-----
>> Lähettäjä: [hidden email] [mailto:elecraft-
>> [hidden email]] Puolesta Gary K9GS
>> Lähetetty: 24. heinäkuuta 2011 17:48
>> Vastaanottaja: [hidden email]
>> Aihe: Re: [Elecraft] Could the be the basis for the KPA-1500?
>>
>> Hello Olli,
>>
>> It's a start but really needs two devices.
>>
>> Any idea what the cost is?
>>
>>
>>
>> On 7/24/2011 8:07 AM, Olli Tuppurainen wrote:
>>> Here is one alternative for HF + 6m
>>>
>>> http://www.nikkemedia.fi/juma-pa1000/
>>>
>>>
>>> Olli
>>> OH6CT
>>>
>>>> -----Alkuperäinen viesti-----
>>>> Lähettäjä: [hidden email] [mailto:elecraft-
>>>> [hidden email]] Puolesta Jack Chomley
>>>> Lähetetty: 24. heinäkuuta 2011 6:44
>>>> Vastaanottaja: [hidden email]
>>>> Kopio: [hidden email]
>>>> Aihe: Re: [Elecraft] Could the be the basis for the KPA-1500?
>>>>
>>>> We do NOT need any more big amplifiers, they are the reason the
>>>> sunspot cycles have been worn out :-)
>>>>
>>>> 73, Jack VK4JRC
>>>>
>>>> On Sun, Jul 24, 2011 at 1:28 PM, Gary K9GS<[hidden email]> wrote:
>>>>
>>>>> There has been an ongoing discussion on the AMPS reflector regarding
>>>>> the Freescale LDMOS devices currently on the market. A pair of
>>>>> these in an HF amp with a 48V SMPS would be an excellent
> start.....(hint,
>>>>> hint...KPA-1500). I wish I was retired and had some time on my
> hands
>>> :)
>>>>> Check this out:
>>>>>
>>>>> http://www.w6pql.com/1_kw_2m_ldmos_amplifier.htm
>>>>>
>>>>> Also see:
>>>>>
>>>>> Some YouTube videos...
>>>>> http://www.youtube.com/watch?v=02v58cnb41o&feature=relmfu
>>>>> http://www.youtube.com/watch?v=-EACUpIhpac
>>>>>
>>>>> F1JRD also has an article in Dubus
>>>>> http://www.qsl.net/f1jrd/MRFE6VP61K25H.html
>>>>> http://www.w6pql.com/1_kw_2m_ldmos_amplifier.htm
>>>>>
>>>>>
>>>>> --
>>>>>
>>>>>
>>>>> 73,
>>>>>
>>>>> Gary K9GS
>>>>>
>>>>> Check out K9NS on the web: http://www.k9ns.com Greater Milwaukee
>> DX
>>>>> Association: http://www.gmdxa.org Society of Midwest Contesters:
>>>>> http://www.w9smc.com
>>>>>
>>>>>
>>>>>
>> __________________________________________________________
>>>> ____
>>>> Elecraft mailing list
>>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>> Post: mailto:[hidden email]
>>>>
>>>> This list hosted by: http://www.qsl.net Please help support this
>>>> email list: http://www.qsl.net/donate.html
>> __________________________________________________________
>> ____
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[hidden email]
>>>
>>> This list hosted by: http://www.qsl.net Please help support this email
>>> list: http://www.qsl.net/donate.html
>>>
>> --
>>
>>
>> 73,
>>
>> Gary K9GS
>>
>> Check out K9NS on the web: http://www.k9ns.com Greater Milwaukee DX
>> Association: http://www.gmdxa.org Society of Midwest Contesters:
>> http://www.w9smc.com
>>
>> ************************************************
>>
>> __________________________________________________________
>> ____
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

w2bvh

Re: Could the be the basis for the KPA-1500?

On 7/24/2011 11:24 AM, Gary K9GS wrote:
> One thing that someone pointed off off list.....
>
> By having the amplifier and power supply on one board, if the power
> supply fails catastrophically, you have a lot of very expensive RF
> components attached to a burned up PCB. Separate PCBs would be a good idea.
>
If it was broken into 3 modules: rf deck, control (overtemp, swr,
sequencing, fan control etc) and power supply then they could both a
HF/6M amp and a 2 Meter amp which share many modules. You get a bigger
market with commonality of parts and without much extra design work.

--Lenny W2BVH

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AC7AC

Re: Could the be the basis for the KPA-1500?

In reply to this post by Gary K9GS

CONTENTS DELETED

The author has deleted this message.

Ken G Kopp

OT: Dangers of RF

Beware of passing the rods of ceramic wall
feed-throughs through holes drilled through
walls that have foil-backed insulation. (;-)

73!

Ken Kopp - K0PP
[hidden email]
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Edward R Cole

Could the be the basis for the KPA-1500?

In reply to this post by Gary K9GS

Ron,

Excellent advice. Many years ago I built a 832A high-level tripler
for 432 to drive with my 2m transmitter. The output was not that
high probably only a couple watts at 432. I was adjusting the plate
tuning and got zapped with RF which punched a tiny hole thru one of
my fingers. At first I thought it was HV but the metal I was
handling was grounded. It hurt for three weeks. Felt like a hot
number-22 wire had punched thru.

73, Ed
------------------------------

Message: 23
Date: Sun, 24 Jul 2011 14:53:16 -0700
From: "Ron D'Eau Claire" <[hidden email]>
Subject: Re: [Elecraft] Could the be the basis for the KPA-1500?
To: <[hidden email]>
Message-ID: <005201cc4a4c$18c8bb40$4a5a31c0$@biz>
Content-Type: text/plain; charset="us-ascii"

Nice demos and a reminder of just how dangerous QRO RF can be - to people
and to property.

In my commercial work I learned to be as careful around RF as I am around
any high voltage - especially after accidentally drawing a small arc from an
RF source. Messing with 50 or 100 watt Ham rigs from which we often "drew an
arc" with a pencil from a high-impedance point made me careless. My QRO burn
only made a small black patch on my skin, but it felt exactly like a nail
had been shoved through my flesh - and it felt like the nail was still there
for days! RF burns are deep burns that injure a lot of tissue and nerves.

If I had been doing that YouTube demo, I'd certainly have worn the welding
mask and more than that T-shirt in case some hot metal bounced around.

Until now, a solid state amp could do limited damage because it would fail
in milliseconds. The demos show these solid state amps are as robust as
vacuum tube amps, and so they are just as dangerous.

And we all should remember that one doesn't have to draw an arc or get a
surface burn to do deep tissue damage from an RF field. That's why there are
firm guidelines for RF field exposure.

RF can set fires too. G3BDQ tells the story of the Ham whose end-fed wire
ran through a hole drilled in his wooden window frame. Every time he held
the key down a curl of smoke would come out of the hole.

Ron AC7AC

73, Ed - KL7UW, WD2XSH/45
======================================
BP40IQ 500 KHz - 10-GHz www.kl7uw.com
EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-?
DUBUS Magazine USA Rep [hidden email]
======================================

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