We are powering a circuit with a 12 Volt battery. We have a RF remote controlled Relay to turn the system on. When the system turns on the current draw is 15 Amps and then settles to 6.5 amps. The voltage drop is about 2 volts +- on start up too.(measured using a multimeter). Our problem is the RF circuit is bothered by this voltage drop and starts to act funny and not do what it is supposed to do when pressing the remote buttons. If I power the RF unit with an additional battery everything works fine. My thought is if I can put a cap on the power supply side of the RF unit it will act to smooth out the voltage issue. Can someone please let me know if I am thinking correctly and how I would figure out the correct value Capacitor. This is a small setup so I need to be able to put the cap in tight quarters. I look forward to any suggestions. Thank you in advance.
Either try a big capacitor across the RF receiver being fed through a big resistor which will more or less isolate it from the sudden transients when the circuit is triggered, or (the more sophisticated, but more reliable solution), use a boost converter to feed the RF section so that the battery voltage is irrelevant, the boost converter will always supply a voltage above the battery voltage (and it'll be a fixed, regulated voltage too) so that the RF section gets a steady supply voltage under all conditions.