Obviously, but why only 40% negative peaks while hitting 180% positive peaks?Your first picture looks like an AM carrier w/o modulation, and the second one looks like a modulated sine wave.
Nope, nothing clipped, nothing added. I can pinch the carrier off down at around 10 watts, but then you can't even keep the positive peaks on the screen.
I've had this scope for 6 months or more .......... I just knew I should have left it in the closet instead of hooking it up :blushing:
Well, it wasn't supposed to :sad:Are you sure nothing has been added? Thats the characteristics of a swing kit!
Well, it wasn't supposed to :sad:
I just checked and my 2970 looks eerily similar on the scope.
Well, it wasn't supposed to :sad:
I just checked and my 2970 looks eerily similar on the scope.
Well, I just popped the 2970 open and found a diode across R292/C258 that I'm pretty sure isn't supposed to be thereChange that resistor out! Its in the back right corner of the radio if your looking from the top.
Well, I just popped the 2970 open and found a diode across R292/C258 that I'm pretty sure isn't supposed to be there
I kept thinking I wasn't triggering my scope right, or it was junk. I triggered it from both the positive side, then the negative side. Then I went as far as feeding the raw signal into B, triggering from B, and looking at the modulation on A. At least now that I've wasted all day, I know how to use the scope and I know that my radios aren't what I was expecting.
JD, I'm not sure my eyes can handle this SMT bullshit. I need one of them lighted magnifying glasses :angry:
Its not, it's in series, but I'd sure like to run a little larger carrier to get 100% modulation.If that diode is bypassing that resistor, changing it is not going to have any affect on the radio.