I need some help trouble shooting bitx 20 ver 3b mixer stage. The VFO p-p is 125mv (In fact I had to add a capacitor to the frequency counter for it to work)) Q7 dc voltage is per the manual , when I

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Newbie to uBitx and at 74 years young new to arduino also. I have a V5 ubitx. Having trouble calibrating frequency & BFO. I can adjust the frequency listening to another receiver and I can adjust the

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Thanks to all of you for your input...Regards Jes M0JSW

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THIS is what I planned to do bu the provided diode is only rated at one amp. I wanted then to put a 5A diode in series with the positive line but didn't have one on hand. I also agree that the .7V is

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2.5 should work, but I am running 3A for just a little margin. Woody

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If you put a 3-5 amp rectifier in series with the positive lead you will not blow fuses or damage any parts due to reverse polarity. The .7 volt drop will not be noticeable to you or on the receiving

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Hi, A fuse may or may not prevent damage to the gear that is downstream - your rig. It is likely to limit damage but something has typically already failed to blow the fuse. Progressive damage will st

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Jes The reason to have a fuse is to limit damage from an over current condition. I sense the fuse does not have to be too close to the nominal operating current, and possibly there can be some oversho

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Apologies if this has been asked a hundred times already, but what is the ideal rating for the reverse polarity fuse on a ubitx. I think I read somewhere that 2.5 amps is probably the ideal rating, bu

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The standard 8-way looms are colored per resistor code, 0 - 7. These correspond to pins 1 - 8 then 9 - 16. Smaller connectors similarly color 0 onward for numbers 1 up. I don't have a ubitx so I can't

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Sorry, disregard. ubitx doesn't use the wiring looms. my bad ... :(

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Yes, the pin numbering for the 16 pin Raduino connector is swapped end-for-end on the Raduino schematic vs how it is shown on both versions of the uBitx schematic. That's unfortunate. In both versions

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The schematic diagram for the "B? ubitx" board (base board for Arduino Nano, Si Labs oscillator, LCD...) has an error at the P3 connector, "OSCILLATORS." The pin numbers are in reverse order and thus

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The standard firmware only provides basic LSB functionality. Improved Raduino firmware for BitX40 supporting LSB, USB, CWL, CWU, and other useful functionality is available at https://github.com/amunt

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https://github.com/afarhan/ubitx

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this link is about the UBITS board connected tp Raduino from HF SIGNALS I BLEW UP THE ARDUINO BOARD AND REPLACED IT ON THE RADUINO NOW I NEED THE SOFTWARE TO MAKE THE RADIO COME ALIVE AGAIN. Anyone kn

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Anyone have link to latest software load to go into new replaced Arduino ? Artns7e@gmail.com

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What is the link to the assembly instructions you are using? Leonard

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Most of us in the forum have the rigs from hfsignals.com Do you have one of these from Sunil? https://app.box.com/s/6g5rj15kgpft1mqxkg7h/file/16782106213 Most of us have no idea what transmit current

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Yes the new BITX 3B. I did find a resistor with the wrong value. Replaced the 47 with the correct value 470 on the exciter board. Now the current is the same on the transmit and receive. 12 millamps.

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