Actually, in the later releases the AGC Treshold is tied to RF Gain, so when you reduce RF Gain you also change THRESHOLD, regardless of what the menu says. You just can't see what it has been chang
.. a working Orion II. I think my II got mad at me for spending too much time using the 1.373b5 Orion, and elected to punish me by refusing to power up :-) So the II is headed to Ten-tec for re-anima
I normally just drop off at the local UPS Store after printing my shipping docs with an on-line UPS account. But like Staples, the UPS Store is a franchise operation and employees are not UPS employ
There remain some apparent descrepancies between the manual description and current algorithm operation, and probably everyone agrees one or the other should be fixed. Which one should be the focus
NR did not break between 1.371 and 1.372 if SNR improvement was your objective. Some characteristics changed, but weak signal SNR improvement was consistent with previous versions. Grant/NQ5T
I suspect that was something like the source of the problem. I've had the same driver for years, who showed up like clockwork around 5:30 pm, knew us by name, and wouldn't have missed a pickup. Sudd
The purpose of NR is to increase SNR. It may be nice to have "quiet" copy, but if SNR doesn't improve, you will have quiet nice quite copy of nothing! You may recall I measured in some detail the NR
It's done in the DSP processors that handle all other receiver tasks. Not sure who might have led you to believe that there were dedicated or specialized NR processors. As far as I know, NR is imple
In the v1 Orion it is most definitely the case. It's clearly observable on a spectrum analyser, and isn't just the "analog thinking" of a newbie. This is as much "true DSP noise reduction" as any ot
This IS becoming a semi-annual thing isn't it. :-) It isn't just the topic, it's almost literally the same discussion. I'd call it déjà vu, but it's more than just the "spooky feeling" we've been he
Actually, not necessarily. Autocorrelation (and also the cross correlation matrix) IS used in one form or another in establishing the error term between the de-noising filter's output and the desire
The textbook I referred to is available from Amazon. You can take it up with the author if you don't agree with the mathematical derivation or operation of a Wiener filter. It is written in English,
The Orion and II have TWO 32-bit floating-point ADI SHARC DSP chips. You can find schematics on rfsquared.com, with all the detail you might want (but no lines of code). Iknow we're all trying reall
Gee, Scott. Doesn't T-T just GIVE a new radio du jour to all 28 of you? ;-) (Employee ownership of an Orion, or not, is akin to fretting that all Cray employees that know how to use a computer don't
NR works in a variety of ways, including using LMS or some other adaption algorithm to adapt the coefficients of an IIR or FIR filter, in the classic Wiener filter noise reduction algorithm. And the
It would depend on the number of filter taps, which drives delay and processing power requirments. Heck, it's even possible to have the number of taps be an adapted parameter (I don't think that's g
Unfortunately (or some might argue, fortunately), some of the really hard core CW contesters on this list are still using the Orion I, which we know has an issue with the two most narrow roofing fil
Yes, I know. That may well be. And I wouldn't posit otherwise. So even after it was redesigned to his spec, it's still "noisy". All I intended to do in my post was to ask the standard question of a