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I kinda assumed the OP's comment in the .asc faint 1KHz signal on faint 384KHz station.
implied they were aiming for a 384kHz carrier. Which is odd in itself, as it's not broadcast and not ham, are they into NDBs?
Agreed, a .sweep to tune it would be in order. At the moment it's fed from a very...
Taking a look at your .asc you have a 1kHz signal linearly added to a 384.259 Hz carrier. You better have a really long antenna for that puppy ;)
If you are thinking of AM, then you should use a controlled voltage for the carrier, multiplying it by the value of the modulating signal, and taking...
Thanks, this now compiles. I have not played with .tran in LTspice although i have done it in other spice versions. It is news to me that you can do a transient sim of a 4046 PLL at all, so I will have learned something new and useful if that is the case ;)
However there is still an error I...
Your sim doesn't run in my version of LTS., missing 4013B and LM339. Anyway - from the PNG schematic at a guess it works thusly:
AIUI, You generate 0.25 cycle width pulses from both positive and negative crossings of the IF in elements X1 and X2, sum the o.c. outputs pulled up by R4 to get a...
How does it handle the situation of several transmitters all at slightly different SC frequencies? AM sort of handles that as long as the heterodynes don't get into the AF band, though you get fading. But your PLL can only sync to one. Trying to demod a DSB sig with an unsynchronised carrier...
In that case simulating fig 48 in the datasheet with V1 AC [some reasonable value to stay within the power rails at your chosen gain level] and running .ac dec 10k 10M should be a good test, and give somewhere for the input bias currents to go. Or use V1 AC [some value as above/2] stacked on top...
Why not inquire of the data sheet which tells you a -3dB BW of 120kHz @ G=100 and various other gain values on page 4? There's something peculiarly bizarre about using a computer to run a simulation of a model of this device, though I suppose biasing it up, setting gain and running .ac dec 10k...
I am a hardware on the bench type of guy :) You can have an ideal mixer by multiplying one input voltage with another, but simple analogue simulation often looks for the DC working point and does a linear simulation around that which isn't going to get you anywhere as far as producing signals...
Getting your radio further from the audio stage is good. The reason for taking the audio cable out is that somewhere in your system you have wires to the LM 386 acting as an antenna leading RF into the chip. You are trying to chase where this is coming into the chip. Obviously if you take the...
The audio mixer feedback is a very different beast from the RF mixer - the audio feedback is simply the delays and shifts in the audio paths, combined with limiting in the channels, then feeding it to another audio mixer and getting general positive feedback. Sounds dire to me, but each to their...
Are you planning on using this sort of mixer feedback loop with this type of mixer or have I totally got hold of the wrong end of the stick? They're not one and the same thing. I suppose you could simulate feeding the output of an analogue multiplier back into its inputs, but your output signal...
Absolutely, I meant U1, my bad. I didn't know the input to the 431 was high impedance as Mike said, although it's obvious in hindsight looking at the resistor values above and below U1, so Mike's location is a better place for the cap, though it'd work okay where I meant it to be.
I did mine...
What happens if you take the audio cable off the ribbon input and transmit? Does the interference get better? If not, what happens if you short the input to the LM386 (without the input cable)? How about putting about 100pf across gnd and the audio in pins of the LM386, first without the input...
I haven't used that specific circuit, but something like it, somewhat overengineered with a PIC because I hadn't come across that one which is better. Size the FET big enough and it's not a practical probelm, yes, in theory if you are just above the threshold and a pump kicks in on the load side...
I think you would have to be careful of what would happen in a fault condition. Say one cell shorted, you would probably always have a high charging current and gassing of the remaining five cells. The fully charged voltage of a lead-acid battery is also temperature dependent - my solar PV...
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