TESTING of the Transmitter & receiver R/C link

DeBug Circuit Operation: The circuit is a missing pulse detector with latch and L.E.D. driver circuit. The addition of this circuit to the BATgraph ESV will provide constant monitoring of the pulse train from the transmitter thru the receiver to the servo's. If anything is wrong in either the transmitter or receiver this pulse train will normally suffer interruption. This module is a watchdog for missing pulses and monitors the continuity of the pulse train. If it sees a momentary interruption, the missing pulse detector fires the latch and the L.E.D. on the BATgraph switches from a DOT Mode ( one LED ON) to a BAR Mode (all LED's ON) (see pics below) and LATCHES into that mode. The mode will UNLATCH by cycling the power on the receiver with the transmitter powered. .

RANGE TESTING: Range testing is probably one of the most important tests you can make of an R/C craft to insure its' safe return, it is also often overlooked! Range testing is done before flying and with the transmitter antenna down. The idea is to see how far away you can get and still control servo's, with the antenna down, and record or otherwise mark that distance for future tests. Using the missing pulse detector of the DeBug BATgraph gives you an even better idea of range tests since it latches upon the first missing pulses encountered at the servo's.INTERFERRENCE ON YOUR CHANNEL (including another R/C transmitter):This test uses the high gain of the R/C receiver (with the transmitter OFF) to "Sniff" the channel to see if there is any interferrence that will cause servo instibility. This is not a specturm analysis, but it is better than a spectrum analysis since it uses the very sensative receiver to monitor the RF frequency spectrum of interest.The spectrum of interest is that portion of Radio Frequency engery to which the receiver is tuned or listening. A specturm analysis is only important when trying to find the source of interference because the interference often comes from harmonics of other transmitters on sub-multiple frequencies of the R/C receiver.THE TEST IS CONDUCTED with the TRANSMITTER OFF:

With the transmitter OFF turn on the receiver equipment. Since the transmitter is OFF it should not be receiving any pulses if the airwaves are free of interrference. This will LATCH the BATgraph into the BAR mode. If the BATgraph stays in the DOT mode pulses are being received from another source. This could be another transmitter at the flying field on your frequency or some other interferring transmitter. In either case change frequencies or locations! If the BATgraph switches into the BAR mode it indicates an absence of interferring signals and it is SAFE to FLY. It is now safe to turn on the Transmitter and cycle the power on the Reveiver to unlatch the BATgraph and return it to the normal DOT mode. You should never turn the transmitter on first since someone flying on that channel may crash. Most sites have flying channel pins that you are suppose to have before flying, but I have seen this senerio happen regardless of the safeguards.

Below is the CarGraph ESV...for 12v and Alternators.

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