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I had the same problem with some power mosfets sold on eBay. I installed one in a 220 MHz transverter and it immediately blew a fuse. Turned out that the devices I received didn’t even have the correct pinout although they had the correct part number. Beware …….

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From: [email protected] [mailto:[email protected]] On Behalf Of Richard Andrew Knack via Groups.Io
Sent: Tuesday, March 21, 2017 4:40 AM
To: [email protected]
Subject: Re: [BITX20] uBITX Questions

Here's a link to an article on how to avoid fake RD16HHF1's...

VK4ADC's web - Beware fake semiconductors

By Super User

azaxcssfsfs

Rich

KC8MWG

On Monday, March 20, 2017 11:29 PM, Mvs Sarma <mvssarma@...> wrote:

members trying for RD16 on ebay are mostly landing at fakes. I had a lot of 10 (supposedly re printed stuff using IRF5** series.

?
After a long search i could find only one seller who sold genuine stuff on ebay. But he charges more.

?On the item description you clearly find that item is generic, or unbranded , or NEW.

?they are all fake

On Tue, Mar 21, 2017 at 5:00 AM, Trent Trent <vk7hrs@...> wrote:

Irf530 would be better HF power and cheaper than the rd16 but a rf16vhf would b nice

On 21 Mar 2017 4:27 AM, "Jerry Gaffke via Groups.Io" <jgaffke=[email protected]> wrote:

Easy enough to twist the gate and drain leads on the RD16HHF1 such that they fit into a board drilled out for the IRF510.? Maybe put a bit of heat shrink on them to ensure they don't touch where they cross over.? Allison reports the IRF510 works as well as the RD16* parts at HF through 50mhz, ?primary reasons to move to the RD16HHF1 is heat: ?avoids need for mica insulators at the heatsink, and gives better heat transfer from die to package tab.? Otherwise the IRF510 is an excellent choice for a minimum cost rig.? Good luck with hacking the uBitx PA to work smoothly from 160 through 2 meters, I'm fine with a good solid simple easy cheap 80/40/20 SSB/CW rig.

Jerry, KE7ER

On Mon, Mar 20, 2017 at 08:24 am, Lawrence Galea wrote:

I suggest that when you do the pcb design for the μBITX make pads for the PA so that people can either use the IRF510 or whatever you are going to finally use and an RD16HHF1 or RD16HVF1.
This would allow people to use the much sturdier RD if they want to and use only 12v for the supply and more so if they are going to use it up to 30MHz or even higher, perhaps on 50MHz and 70MHz with the RD higher efficiency.
The RD16HHF1 works well in the Ukranian transverter at 70MHz.
So perhaps you will remember these points and why not, 144MHz perhaps?

Regards
Sarma
?

#26550

while buying on ebay

?one need to check item description.

?if you find? unbranded, new, or some such? under? "manufacturer"? be sure that it is fake. Generally IRF510 wont be fake , while we get lots of fake under RD16HHF1 type. i had attached a sample look out , in case of RD16 and on page 2 you can find the device?? brand correctly indicated and is good.

?RD16HHF1 device would be costly. i had frequently bought from a seller and they were fine.

all the best

sarma

vu3zmv

bad component and good component examples picked from ebay for RD15hvf1.pdf

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