Re: uBITX drive level..
#ubitx
Mr Kang has published his fix for low drive on his excellent blog:
http://smallwonderqrp.blogspot.se/2017/11/?m=1
73 de SM5NNO
By
Anders Landgren
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#41251
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Re: uBITX AGC - Adafruit TPA2016, A Success!
#ubitx
Which 2 boards?? I know the one is the TAP2016.? What's the other?
73, Michael
KM4OLT
By
Michael Monteith
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#41250
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Re: RD16HHF1 in the uBITX
#ubitx
Curious.
Farhan recommends 100ma of bias through each uBitx FET, same as the Bitx40:
? ?http://www.hfsignals.com/index.php/ubitx-tuneup/
WA2EBY recommends 10ma in part2 of his writeup.
It does make
By
Jerry Gaffke
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#41249
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Re: Case
Me too
Pat AA4PG
http://www.cahabatechnology.com
________________________________
Sent: Monday, February 5, 2018 7:24:03 AM
To: [email protected]
Subject: Re: [BITX20] Case
I agree:
[Inline
By
pat griffin
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#41248
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Re: uBITX AGC - Adafruit TPA2016, A Success!
#ubitx
Nick
Did u post some code or did I miss your posting
73
Art -N2AJO
By
Art N2AJO
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#41247
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Re: Anyone (US Only for now) need a uBITX Raduino repaired?
#ubitx
Hopefully, I won't need your service, Jim, but it's great to hear that you're willing to provide it!
--
73 de W5NNH
By
John Kemker <kemkerj3@...>
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#41246
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Re: uBITX AGC - Adafruit TPA2016, A Success!
#ubitx
It¡¯s a pretty complex device?Data Sheet ( https://cdn-shop.adafruit.com/datasheets/TPA2016D2.pdf )
i guess somebody could come up with device configuration for menu settings:
AGC fast, slow,
By
bobolink
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#41245
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Re: Case
I agree:
Jack, W8TEE
To: [email protected]
Sent: Monday, February 5, 2018 5:58 AM
Subject: Re: [BITX20] Case
I always enjoy seeing how others have built their BitX's and thought I'd point out
By
Jack Purdum <jjpurdum@...>
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#41244
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Re: Second batch of uBITX shipping?
#ubitx
You couldn't make it up - My ubitx took just 24 hours to get from India to Germany with DHL and has now sat for 3 days (so far) at the customs in Leipzig and they are refusing to release it without a
By
dj0hf
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#41243
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Re: Case
I always enjoy seeing how others have built their BitX's and thought I'd point out some ideas I used with mine that others might find useful. For example:
1. Almost everyone places their tuning
By
Vic WA4THR
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#41242
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Re: uBITX drive level..
#ubitx
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
By
Tilman, SM0JZT
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#41241
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Re: LTSpice simulation of uBitx Power Amp
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
By
K9HZ
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#41240
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Re: LTSpice simulation of uBitx Power Amp
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 ¨C
By
K9HZ
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#41239
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Re: RD16HHF1 in the uBITX
#ubitx
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
By
K9HZ
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#41238
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Re: RD16HHF1 in the uBITX
#ubitx
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
By
K9HZ
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#41237
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Troubleshooting the
#ubitx
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
By
C¨¦sar EA3IAV <Cesarleon@...>
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#41236
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Re: Case
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
By
Sajeesh Pilakkat <sajeeshpilakkat@...>
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#41235
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Re: RD16HHF1 in the uBITX
#ubitx
Nope. Close enough.
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
By
K9HZ
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#41234
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Re: RD16HHF1 in the uBITX
#ubitx
https://www.radio-kits.co.uk/radio-related/20W_PA/20W_HF_PA_Construction_V2-1.pdf
By
Lawrence Galea
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#41233
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Re: RD16HHF1 in the uBITX
#ubitx
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
By
Alex - PA1FOX
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#41232
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