Trouble with recent batch of KLPs

Wireless & IoT
1

Hey guys

I recently (July) bought a bunch of the 4800 baud 315MHz RF pairs. I already have a few node circuits set up with 2400 baud versions, so I have been using those to test the new pairs.

I’m noticing that while the new transmitters work great, I’m getting nothing from the receivers, not even noise. My test circuit feeds the RX data straight into an AVR and out to a PC terminal. With all the older receivers I have lying around (both 315 and 434) this generates a steady stream of noise, but I get nothing from the new lot.

Can anybody comment on this? (especially anybody who has bought some recently). I know people in the past have found mystery RX enable pins, but I have already checked for this.

Cheers,

Craig

2

Check to see if pin 6 or 7 is labeled “E” or “E/D”. I bought a set once and found that what was supposed to be a ground pin was hijacked for a receiver enable/disable pin.

3

Yeah, I remember you discovering that fun fact so it was one of the first things I checked. The two adjacent GND pins as well as the two adjacent DATA pins are tied on all of the units.

So has anybody bought one of these lately?