[Amps] NXP 65V LDMOS 1K80H-1800W

[Jim Thomson]

Date: Sat, 23 Dec 2017 06:50:38 -1000
From: M Gerber <wh7w.us at gmail.com>
To: amps at contesting.com
Subject: [Amps] NXP 65V LDMOS 1K80H-1800W

<I am sure there are those of you anxiously awaiting your KPA1500 or
<Flex/4O3A Power Genius XL. It appears the RF Kit B26-RF2K5 from Germany is
gaining popularity and even Palstar has a new SSPA offering, the LA-1K.

These 65V LDMOS transistors have been out for a little while and can
already be had from stock at Mouser for $277/ea.

https://www.nxp.com/products/rf/rf-power-transistors/rf-broadcast-and-ism/1-600-mhz-broadcast-and-ism/1800-w-cw-over-1.8-400-mhz-65-v-wideband-rf-power-ldmos-transistor:MRFX1K80H

https://www.mouser.com/ProductDetail/NXP/MRFX1K80HR5/?qs=BZBei1rCqCBcq3ESZPU7bw%3d%3d

I suspect only a matter of time before someone has an offering using 1 or 2
of these devices.

I have used a HP ESP120 50V 57.5A retired server power supply to power my
W6PQL SSPA. Biggest issue I see for home builder is getting a 65V ~50A
power supply. A new TDK-Lambda adjustable 80V 65A power supply would be
perfect but set you back a small fortune.

73/Happy Holidays

Mark WH7W

##  I see on the flex website, that if anybody orders their shiny new  Power genius b4 the end of this month, that Flex will also include, at no extra charge, the mating outboard tuner !  Cant remember if it is 
auto or not, has memories or not.   I still dont  know what the new flex power genius is actually rated at.  They say 1.5 kw  ICAS.    What the heck does that imply ?    That does not sound like 1.5 kw  rtty 
or FM to me.  On their U tube video, just running 1.5 kw on CW,  you can hear the myriad of fans screaming in the background.     The price, including outboard tuner is $6999.00   IMO, that is a lot of $$ 
for a 1.5 kw  ICAS SS amp.  

## One possible fix for the new  65 vdc LDMOS  devices is to wire a   50 vdc switching supply in series with a 13.8 vdc  switching supply, or a 13.8 vdc  analog supply, or  crank up the vdc on the  13.8 vdc supply,
to 15 vdc, if you wanted the 65 vdc .   63.8 vdc is probably good enough.   

## I suspect its only a matter of time b4  a  75-100 vdc LDMOS becomes the norm. 

Jim  VE7RF