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New Toy
Jerry, I don't believe that the 4410a is a peak-reading instrument. If not, then sending anything other than a continuous carrier will give you a lower reading. Switch to straight-key mode and try it.
Jerry, I don't believe that the 4410a is a peak-reading instrument. If not, then sending anything other than a continuous carrier will give you a lower reading. Switch to straight-key mode and try it.
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Don, ND6T
· #88445
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static/hash noise from AGC board
#ubitxv6
#ubitx
Describe your voltmeter. Is it a simple D'arvonsal movement or is it active? Active devices often have their own issues.
Describe your voltmeter. Is it a simple D'arvonsal movement or is it active? Active devices often have their own issues.
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Don, ND6T
· #85301
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Bitx 40 raduino pot or encoder?
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
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
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Don, ND6T
· #76190
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Download from Arduino
A potent argument for displaying file name and version information on a "splash" screen. 73, Don
A potent argument for displaying file name and version information on a "splash" screen. 73, Don
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Don, ND6T
· #76189
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sketch dds-vfo by eZall for bitx40
#arduino
#bitx40help
#radiuno
#smeter
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
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
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Don, ND6T
· #76165
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bitx40 v3 cw mods
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,
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,
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Don, ND6T
· #75218
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bitx40 v3 cw mods
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, 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
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Don, ND6T
· #75217
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bitx40 v3 cw mods
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
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
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Don, ND6T
· #75212
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Help with Audio Chain - M1 and M2 Are Ground?
#ubitx-help
#v6
#v5
#v4
#audiocircuit
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!
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!
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Don, ND6T
· #75168
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Help with Audio Chain - M1 and M2 Are Ground?
#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
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
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Don, ND6T
· #75164
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uBitX as a Shortwave Receiver?
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
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
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Don, ND6T
· #73418
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uBITX CW - digital input?
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
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
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Don, ND6T
· #72586
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i2c encoders in matrix with I/O
#ubitx
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
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
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Don, ND6T
· #71504
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ND6T sort of mini AGC ?
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
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
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Don, ND6T
· #71501
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Audio pre-amplifier for microphone?
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
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
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Don, ND6T
· #71356
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Voltage at volume control of bitx40??
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
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
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Don, ND6T
· #70492
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sketch for Bitx40 with the encoder
#arduino
#bitx40help
#bitx40
#nano
Sergio: Here are two : http://www.nd6t.com/bitx/documentation/encoder 73, Don
Sergio: Here are two : http://www.nd6t.com/bitx/documentation/encoder 73, Don
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Don, ND6T
· #70437
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V5 uBitx CW issues
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
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
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Don, ND6T
· #70375
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kit-projects.com AGC Question - Missing C3?
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
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
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Don, ND6T
· #70159
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Output change.
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
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
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Don, ND6T
· #69614
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