Hi Bjorn! You should no go any lower than 12V for power. Al less than 12V the PA final (IRF510) will not work well. At that voltage you can expect peaks of 1.5A when transmitting and an average 0,18A

Hi Noel! You can sure try. Depending on the DC/DC converter you have it might work. In my case the model I had on hand (for which I've posted the link in my previous post) generates a lot of switching

I managed to connect the DC/DC converter and do a test in receive mode. The noise increases significantly when the converter is powered. It might be possible to reduce it by adding extra bypass caps a

Forgot to mention, the converter does not allow the voltage from input to pass to output when disabled, so a double DPDT switch will be required to do QRP/QRO from a single 12V battery

Hi Robert! I don't think you will get much more noise as the DC/DC converter is only supplying power to the Power amplifier. I did not use it myself as I am not finished with the other tweaks I want t

I tried this thing: Boost-Buck-DC-DC-adjustable Connect the 12V from the power input to the module input, adjust the pot for 20V to 24V at the output and connect your PA power connector to the output

Disconnect the red wire coming to your Volume pot and connect it to AUDIO IN. Connect a wire from AUDIO OUT to your Volume pot where the red wire was before.

Yes, I have the same problem and it was present even before of the last night maintenence. I created a folder but I cannot upload any file there. I was planning to upload some documentation for compon

Ricardo, To calculate the frequency of a Clapp oscillator you should use the information found here: Clapp Oscillator Now, BitX is using a VFO that oscillates between, roughly 4.5 MHz to 5 MHz. The C0

Probably wrong SI5351 library installed

Hi Ken! Did you use 10 mfd or 10 ufd?

I found the drawing of the jacks we received. From the versions ours is the one with 5 contacts (XXXXX..4BH3) http://www.switchcraft.com/Drawings/35rapc__h3_cd.pdf

Did you received a schematic with your kit? Can you post it? Is it the same schematic as the version with Raduino only using the coil? I will need the information to calculate new values for capacitor

Hi Art! What type of jack do you have on your headset? 3 contacts or 4 contacts? Can you get a diagram of your headset connections to the jack? Once I know what you have I might be able to help

Hi Jack! I compiled the sketch and uploaded. I do not see any functional or behavioural difference, except of what you stated, a smaller amount of Flash and RAM in use. Thank you for your great contri

Arduino Nano with ATmega 328

Hi Sarma! The load current is way lower, about 0.15A (what the current draw on the +5V line is). That results in a power dissipation of 1.25 to max 1.35W. TO-220 package has a thermal resistance Jonct

I sort of fixed the problem. First I found my offset (-150Hz). That means for a signal of 7.125MHz I had to adjust at 7.12515MHz for zero beat. Then load the sketch into Arduino IDE and look for the B

I don't have a problem compiling or uploading any sketch (you just go in Library Manager and change the version of the library you want to use). My problem is that, regardless of the message on the sc

During the first setup I have calibrated the frequency readout. The behavior was as described. Connect A2 to GND - message on screen "Calibrate". Keep holding A2 to GND rotate the tuning pot for zero