I'm convinced there's a bug in the code for the Sub RX somewhere. When you narrow the passband on the SUB, it (1) narrows from both ends or (2) narrows and shifts away from the low end at the same t
Barry ... It has not been fixed in 2.032, presuming we're talking about the same problem, which we may not be. What I'm refering to isn't an EQ issue, it's a passband position issue. In SSB mode, wh
Yes, I have. I'm going to send them another note, with this file attached. http://tinyurl.com/n82l2 It's hard to miss the fact that something is amiss :-) Grant
Just an "I should have made that clear" comment, relative to the spectral displays in the document at the link, lest anyone incorrectly conclude the Orion II receive audio output is not flat. These g
The total bandwidth is 6 Khz. So you're only going to see 3 Khz of audio if you are center tuned on an AM signal and have PBT = 0. If you tune to one side or the other of the signal, or set PBT to p
But it isn't limited. Use PBT. You can get about as close to 6 Khz of AF response as you will with 12 Khz of bandwidth. And yes, it's only one sideband, but unless you're trying to squeeze every las
Actually, pink (or 1/f, or flicker) noise has a lower high frequency content (relatively) than "white" noise. White noise has the same energy at every frequency. Pink noise has the same total energy
No one is disputing the mathematics behind one sideband with carrier, and we'd all like to have a full 6Khz or therabouts per sideband. It's all true, and it's mostly totally beside the point. In any
Sinisa, you're almost always right. And you're right on the theory behind all of this, too. But in a practical sense, as a guy with a lot of AM SWL and ham band experience, it just doesn't matter th
(1) The R-390 is not totally an "old radio of the past". The A version was built well into the mid-1980's. I'm 6 years older than my much older than that "old radio of the past". Which makes me an "
I'd offer the following recent paper by Dallas Lankford as interesting reading. While it addresses specifically AM distortion caused by fading, there are some other useful points. If you're not into
Actually, that's not correct. Lankford adjusted the square law equations to the case of diode (half-wave detector) multiplying by the Fourier series for half-wave rectification. Some preliminary tes
He referred to it as % harmonic distortion, not THD. If you'd share the formula for one harmonic relative to the fundametal it would be appreciated. Grant/NQ5T
I'm going to play around with it some more tonight. I only ran at 50% for the quickie this afternoon. There's also a funny non-harmonic spur that shows up, just on the +PBT side of center, at about