¿ªÔÆÌåÓý

  1. BITX20
  2. Messages
Single Messages Topics Expanded Polls

Re: Ideas for "bulletproofing" the uBitx

 

¿ªÔÆÌåÓý

Don¡¯t understand the point.? Why would you want to operate excellent RF transistors designed specifically for the 12-14V mobile world at a higher voltage?? They make all of their power in that range.

?

You are correct¡­ that most people won¡¯t get much out of replacing IRF devices with the RDs¡­? until they blow out a set or two of them.? Then it will start to matter, because the RD devices survive much better under bad circumstances like infinite SWR.? Again, real RF transistors designed for load mismatch tolerance ?(read the app note, load tolerance spec).? Bullet-proof.

?

You are also correct that most people won¡¯t spend the time to replace the IRF devices for the RD devices even after they kill a few sets.? They will just keep killing IRF510¡¯s.

?

From: [email protected] <[email protected]> On Behalf Of Jerry Gaffke via groups.io
Sent: Thursday, December 31, 2020 4:43 PM
To: [email protected]
Subject: Re: [BITX20] Ideas for "bulletproofing" the uBitx

?

I mostly jumped in here because I think it important for the many owners of a uBitx
to know that swapping out the IRF510's for RD*'s is by no means necessary.
The stock rig is perfectly fine, and won't go up in smoke with high SWR when operating at 12v.

Have those who have made the change (without a bunch of other mods),
noticed much difference in performance?
I'll go out on a limb here and guess "nope".

Since the RD*'s can't operate much beyond 12v, I doubt a uBitx with RD*'s
is actually all that much more robust.

Jerry, KE7ER


Virus-free.

--

¡­_. _._
Join [email protected] to automatically receive all group messages.