by plasoneal » Thu Apr 11, 2002 6:38 pm
Mike and/or Steve:
I restested my JR radios again, with both the crystals removed. I tested both in-line between the two boxes, as well as across from the signal to the ground while the two boxes were connected. I still get a spike that starts at probably around 6 volts the first time I touch the leads and then it drops almost immediately to near zero. After this drop, I do see some voltage (AC) which on my meter appears to be <0.2 volts, assuming my meter is accurate. (It's an older meter, but to the best of my knowledge works ok.) This fluctuates up and down a bit if I trigger the "trainer" button on either of the two boxes.
This seems to be a lot lower voltage than is documented for the JR radios, yet they both work fine w/each other. (One is 6-7 yrs old, the other about 2 yrs old.) Got any idea what's going on, or if I'm doing something wrong?
RE: my old Tower Hobbies TX, it has a seven pin plug in the back. I've found the ground and can find a comination of different readings. I've got one as high as 10 volts DC, about 6 volts DC on another, and then about 2-3 volts DC on a third one. Right next to the 2-3 volts one, there is another socket that reads 2-3 volts, but ONLY when the "trainer" button is depressed. Because of that, I'm assuming the one on constantly @ 2-3 volts is the signal. Sound right? If so, what kind of interface would you recommend? Is this likely PIC instead of PCM?
I won't keep bugging you guys forever on this....but if you have any more leads, I'd appreciate it.
Thanks again,
Paul