Re: Buyer beware! RD16HHF1
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Well this is not entirely true.? You will get about the same performance out of the RD16HHF1 as that of the IRF510 by just replacement. Where the RD16HHF1 comes alive is when you also do other mods. ? There have been plenty of posts in this forum about the advantages using 1:4 transformers and others to perk up the RD16HHF1 sets. ? I think the real advantage of using the RD16HHF1 is 1) its much lower Gate capacitance that the IRF510 making it easier to match and flatten the power with frequency, and 2) it was designed for use at 12 volts, whereas the IRF510 comes alive in the 28+ volt range. ? There is a plethora of designs available to learn from.? See here? for starters: ? G6ALU ?? TF3LJ SoftRock? Open HPSDR? G6LBQ? G0IMX? VK5FE? MiniKits? Radio Kits? NT7S? ? This one on 6 meters¡ ? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: Like us on Facebook! ? Moderator ¨C North American QRO Group at Groups.IO. ? email:? bill@... ? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Jerry Gaffke via Groups.Io
Sent: Sunday, May 13, 2018 11:30 AM
To: [email protected]
Subject: Re: [BITX20] Buyer beware! RD16HHF1 ? Also, keep in mind that if you plan to move from the IRF510 to the RD16HHF1,?
the uBitx final should have some adjustments to the transformer ratios and such.
The RD16HHF1 is not quite a drop in replacement.
Jerry
On Sun, May 13, 2018 at 09:17 am, Jerry Gaffke wrote: Allison has quite a few posts here.
None have discouraged experimentation with the IRF510's.
Quite the contrary.
She did however suggest you get your RF parts from reliable vendors,
be they IRF510's or RD16HHF1's.
Jerry . . . ?
On Sun, May 13, 2018 at 08:54 am, Russ Hines wrote:
Gents and ladies, I don't post much as I'm a busy broadcast engineer.? But I try to read often.
Allison's post contains wisdom.
Education tends to be expensive.? If your goal is IRF R&D, then knock yourselves out.? You will go through a lot of parts, and likely as not, spend a lot more time and money in acquiring the knowledge and experience.? In the end, you'll know what a part can or cannot do.? If that's YOUR goal, great.
For myself, my time is worth something to me.? I think it's false economy of both my time and money to blow up a few dozen $0.50 parts, chasing issues created by the selection of an inferior part from an unreliable source, when one appropriately selected and sourced $4.75 part will accomplish MY goal - to use a piece of equipment that I built.? The former is not worth the hassle.
If you need a cliche, here's two:? I'd like to "not reinvent the wheel," but would much rather "stand on the shoulders of giants."
Two cents duly submitted.
73,
Russ Hines
WB8ZCC
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