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Hi? Of course "decrease" means a smaller resistance.... The original R63 is 47ohms. I cannot find 11ohms but 10 or 12 ohms in my supply.... / Tilman

Dunno about that. I always design my LP filters at 50:50 ohms in and out... and my PA transformers are 50 ohms at the output. I don't know why you would want to make the LP filter a transform

I have the .model for the RD series transistors if you care to run that too. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch –

BTW the BLF series was designed for this very thing. Peak RF Voltage breakdown is also an issue. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big

Well thats a loaded question. Reflected power just means that the transistor must dissipate the power. So at infinity SWR, the transistor(s) must be capable of dissipating all of it. A 50 watt

As others, I am facing problems regarding tx on my #ubitx First test I did without case showed no power on meter. I did not give importance to this then as I thought it was just an old uncalibrated

Dear All, Inviting you all to have a look on uBitx Case Home brewed. http://vu3psz.blogspot.in/2018/02/ubitx-home-brewed-enclosure.html

Nope. Close enough. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa Grand Piton

https://www.radio-kits.co.uk/radio-related/20W_PA/20W_HF_PA_Construction_V2-1.pdf

Yep, correct. I'm still here :) View this link?( https://youtu.be/pP1kXFidNTw ) for the receiver in action so far. I've been messing around with RD16HHF1 and it looks promising. Due to lack of time

Hmmm, I'm not assuming anything about drain loads, only that the load on the output of the transformer should be 50 ohms. The LPF's on the uBitx and WA2EBY are symetrical, 50 ohms in and out, no

Very good, Jerry. However, note that the output is NOT 50 ohms until AFTER the LPF. The input to the LPF is somewhat lower. And the WA2EBY has a voltage advantage over the 12V input to the drains,

He might be referring to the MRFE6VP61K25H/HS. Probably seen here: http://www.eham.net/ehamforum/smf/index.php?topic=75793.0 Vince. -- Michigan VHF Corp. http://www.nobucks.net/

Impressive. But what's an SER? When I google "transistor SER" all I get is a bunch of Spanish language pages.

I've now uploaded an LTSpice simulation schematic file that allows easy comparison of the uBitx and WA2EBY finals, also a pdf version for those who have not installed LTSpice: ?

Bill:? Sometime ago I read about a transistor that can handle a 65:1 SER. Do you know anything about the device? Sent from my Verizon, Samsung Galaxy smartphone

Ha! Re-designing the transformers is most of the tricky work. Yes; you will have to do that. It might require some experimentation. Try to use FT-61 hog-nose material. I think it will be more or less

Excellent, thats what I am hoping to get to. So the bias will need re-adjusting... Easy....? What about the input and output transformers? I assume this will need modification due to the differnet

See attached? diagram I use for connecting the Colour TFT and atmega to the UBITX Joe VE1BWV

Two RD16HHF1 parts replacing the 510’s will do that. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton,