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WB2CBA QDX Mosfet PA Mod

 

Is this modification applicable to the QMX?

73 - Pierre - FK8IH
 

Probably won't fit due to space problems.
If you have a good idea for using it in a small space, you can try it.
--
Gyula HA3HZ
 

I don't think there is enough physical space in the QMX for Barb's mod.?
--
73, Dan? NM3A
There are moments when everything turns out right .... Don't let them alarm you; they pass.?

-Jules Renard
 

In my QMX I went with 4 x TN0110 instead of BS170. Works very well.
--
73 Bojan S53DZ
jim conrad
 

The TN0110 spec sheet (Pd, Vds, Ciss, Rds, Tr, Vth...) sure looks attractive.? Do you have any measurements (like output power on different bands, etc)?? Anyone else have experience, good or bad, with this device???

I can't believe I missed this device while searching for a more rugged Class D final.
--
JimC (KQ7B)
 

Hi,
These are my measurements.
Actually the RF output power stays quite the same but with those MOSFET's parameters I can safely operate at higher supply voltage with no danger to make a mess.?
--
73 Bojan S53DZ
 

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I have been running these in my high band unit. Just be aware that the pinout is reversed relative to the BS170 so they have to mount with the flat side up.

Tony
AD0VC

From: [email protected] <[email protected]> on behalf of jim conrad <conr2286@...>
Sent: Saturday, December 9, 2023 9:37 AM
To: [email protected] <[email protected]>
Subject: Re: [QRPLabs] WB2CBA QDX Mosfet PA Mod
?
The TN0110 spec sheet (Pd, Vds, Ciss, Rds, Tr, Vth...) sure looks attractive.? Do you have any measurements (like output power on different bands, etc)?? Anyone else have experience, good or bad, with this device???

I can't believe I missed this device while searching for a more rugged Class D final.
--
JimC (KQ7B)

jim conrad
 

Bojan,

Thanks!? I think you found the finals for my little project (something like Han's QDX but constructed as a hat for a Raspberry PI operating from a 12..13.8v supply with wsjtx/etc on the RPi) as well as something more rugged for a QMX.??
--
JimC (KQ7B)
 

Jim,
the credit is not mine, I have just been involved in some other threads of this group and made it work. Search for TN0110 in upper right corner.
--
73 Bojan S53DZ
 

Hi Bojan,

I’m happy to hear the TN0110 FETs are working great! I was the one who found this device with a lot of google searches and vendor checks many moons ago. I’ve been following comments regarding this device and haven’t seen any negative comments so far which makes me happy that I could contribute something here.

Back when I first found this device, the fabs had stopped producing the 100V version and the only one available was the 60V device, likely due to Covid’s detrimental effects on the fabs. It made little sense to replace the BS170s with another 60V device but now that the TN0110 is widely available, it’s a great “upgrade” which closely matches the specs of the BS170 but with that extra 40V of safety margin.

Tony - AC9QY

On Sun, Dec 10, 2023 at 2:30?AM Bojan Naglic <bojan.naglic@...> wrote:
Jim,
the credit is not mine, I have just been involved in some other threads of this group and made it work. Search for TN0110 in upper right corner.
--
73 Bojan S53DZ

 

So having speculatively bought some what tells me if they are rated 60V or 100V ??
 

Bruce, the 60v bin select is labelled TN0106...JZ


On Mon, Dec 18, 2023, 5:48?AM Bruce Akhurst <bruce@...> wrote:
So having speculatively bought some what tells me if they are rated 60V or 100V ??

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