Describe your voltmeter. Is it a simple D'arvonsal movement or is it active? Active devices often have their own issues.

#ubitxv6 #ubitx

Yes, indeed. Makes for a very stable operation. More discussion (and some ideas) can be found here: http://www.nd6t.com/bitx/tuning 73, Don

A potent argument for displaying file name and version information on a "splash" screen. 73, Don

Perhaps you are referring to the EZall.ino V1.0.6 by ND6T? In that case those circuits are all described at: http://www.nd6t.com/bitx The S-meter works best if you install the AGC circuit. 73, Don

#arduino #bitx40help #radiuno #smeter

Yes! The unbalanced first mixer works! But don't forget to move the VFO off frequency by an offset difference (like 700 Hz). That could be accomplished by another voltage to the tuning varactor diode,

Dave, Not anything good. For one, it drifts like nobody's business. For another, about the only way to make it transmit CW is to put a tone into the transmit audio instead of the microphone. That resu

Dave, This works for me: http://www.nd6t.com/bitx/CW . You might check out the other mods on the site, also. I mostly work CW and this makes a pretty good rig for that. I also recommend a good audio f

Hah! I forgot to include the relay. Also I meant to say "source and gate" but wrote "source and drain"! So yes, I guess I shoulda stayed at Holiday In Express last night!

#ubitx-help #v6 #v5 #v4 #audiocircuit

Andy, Perhaps you're thinking of the MOSFET as being like a vacuum tube (Fleming valve) and requiring a bias voltage at the drain (corresponding to a tube plate). It does not. Consider the device to b

#ubitx-help #v6 #v5 #v4 #audiocircuit

Absolutely Mike! With the inherent stability of the uBITX it tunes nicely to the exact frequency, zero beat, and no problem in receiving AM. Actually, it is somewhat better since the selective fade is

Rob, You can also do what I did; Use the Nano D1 and write your own firmware. I prefer to use my own keyer, etc. and that makes it possible. I can then use my own tuning method and other stuff like th

Please let us know how this board works out. My biggest concern would be that it probably would need to be constantly queried. For example; If you wanted to put the tuning knob on it, then it would ne

#ubitx

Hello Adrien, That is not an AGC circuit, but is just a limiter circuit. No "clack" elimination but it does limit how strong it appears in your ears. It is hearing protection. I have installed that in

Here is what I use: A dynamic mic element feeding a 3-component common-base amplifier. Fits right inside the microphone case. Matches the 600 ohm element to the pre-amp and great frequency response. D

John, In the vicinity of 10 millivolts for a readable signal at moderate volume. Consider it comparable to "line" levels for your stereo amplifier. 73, Don

Sergio: Here are two : http://www.nd6t.com/bitx/documentation/encoder 73, Don

#arduino #bitx40help #bitx40 #nano

Since the path from tuner to ground becomes more significant at higher frequencies I have found that tuning the ground with a variable series LC circuit helps incredibly. Otherwise it is frequent that

Looking at the picture it appears that you have not attached the switch. Without a discharge path from the common (S meter, AGC voltage) to ground then C6 will remain charged and the attenuating trans

I converted a power supply so that it now has a panel voltmeter and installed a voltage control on the front panel. Now when I need to adjust RF output a bit lower I can drop it quickly by lowering th

Replace 1 resistor. 470 ohms is a good choice. Saves a bit of current, makes the display last longer, less heat. Here's the link to how and where: http://www.nd6t.com/bitx/Backlight dimming I do this