Re: Dropping Internet connection, -source of problem, BSNL, servers, Modem, or Inver
@THETRADER
so whats the final call/verdict of the cause and exact solution?
(Tried PM'ing but probably you have disabled PM's)
Hi, Sorry, I thought you were going in for a online pure sinewave inverter, and was not following this thread anymore. I have not disabled (PM) anything, just checked again and could not locate where such disable /enable is present.
Anyway, coming back, I have considered 'Mains coming back, higher voltage, etc.,' and then only suggested 13.5V AC custom made. 15V AC transformers are available right off the shelf, and that is the reason I was hesitant to suggest that.
About lower current rating of the transformer, if your device (modem) needs more current than the rating, the voltage drop would be higher upto a certain point, and constant overloading will make your transformer give up the ghost! Never use a transformer of current rating lower than what is required.
These Multimeters are calibrated to show the voltage correctly within the specifications (of the multimeter) if the input voltage waveform is sinusoidal. For the DC supply for the modem, it is the peak values that matter. The quasi sine ones normally on no load (your modem is 'no load at all') have higher peaks which would satisfy the DC requirement. At higher loads the middle peaks flatten out and the pulse widths get wider........ This will go on like this. However, all the factors you have given still fit into the logic including higher voltage(!) not working, etc., as this gets explained in waveforms.
BTW, take those stuff in the net pages with a pinch of salt, unless it is from a tech co. The reason I am saying is that one of your references, was talking about reducing current from an SMPS 12V output to the modem with a resistor of 5 to 10 Ohms!
Get a transformer of atleast 1.2A or higher rating, custom made. You could give your old adapter and ask for a secondary voltage of 1V higher in the new transformer.
Follow the general rules - Keep your signal cables away from power cables, keep the inverter, UPS away from the modem. Keep all connections firm - the RJ45 and RJ11 especially. Replace those cables if you find the gold plating on the connector terminal is not shiny.
Wish you all the best!