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1.4v is the base bias for the transistor. It is developed through resistors R61 and R62. If you have 12v at the TX point then the voltage at the base of the transistor will be (R61/(R61+R62+R66) times

I had a look at the links and there doesn't seem to be any CAD files there. I guess I'll have to break out the caliper and measure the stock board.

Thanks everyone for the help! Jerry, yes, I've been busy behind the scenes doing a lot of things with the control system. I now have the entire app running on an STM32F103 "Blue Pill" board, which is

Thanks Doug, your notes are very helpful. 73, Dennis W7DRW

These might not apply to Rogier's issue, but since I have already typed this up, it may be still helpful to him or someone else. I had 2 issues when trying to connect to the supplied Nano on the

The check would be you must be putting st least 2A into (24W to the finals, ~50% efficiency) the finals to be in the 10-12W region. I don't ever believe scope readings as accurate. For power out I use

I found that there was too much attenuation in the ezdigi board so I use just the isolation transmformers and bipassed the rest. Mounted the board into the ubitx case and hardwired the ubitx side to a

http://microcontrollershop.com/product_info.php?products_id=5541 How about that one?

A little background I was given a bitx 40 for a gift from my brother. I'm a tinckerer? by nature so this makes sense. However, electronics are kind of new to me. Since this will be my first HF rig I

Allison, Thanks for your comments on small transmitting loops.? Seems to require a lot of work to get one working well. They are quiet on receive for sure but lots of Monkey Business to change

Correction, 10x does not work, 1x does. 10x would read double if that 9meg resistor inside the probe was more like 4meg. And that could easily be measured with an ohmmeter from probe tip to bnc center

Very weird, your math looks right to me. Could be a bad scope probe, have you tried more than one probe? Could be a bunch of bad scope probes. You have 4 measurements saying around 5 Watts and one

Sounds like a good setup. I’ll be doing something similar.

Yup, I have no idea why they come mounted sticking out the side. If you wish, once flipped you can keep that LM7805 cool by soldering the tab to the Raduino ground plane, though somebody once pointed

I cant see any attachment. Just google and you will see what they look like. Check your polarity of connection.

Thanks to?Ufi Auttorri for creating this guide. It was certainly a lot of work to do this.

I solved my stability problem for the Hendricks Bitx20A ?kit by applying the?Martiens mod. ? ? Now I need to resolve a low power output problem. ? I had been just calculating the power output

I am (unfortunately) counting in from the right, so my pin numbering? is reversed from that shown at? ?http://www.hfsignals.com/index.php/ubitx-wire-up/

Yup, this one has been hard to follow. Let's keep this thread going, seems a fine title for it. Doing a search for "Rogier", I find these: /g/BITX20/message/47715

I've been working FT8 for a few days on my shiny new uBITX tied to a homebrew G5RV set up as an inverted v.? Just finished a 20m QSO with Tasmania.... thats over 9000 miles on just less than 9w!