Here we go again.
We know it works well in Commercial cellular and for sure its needed on our crowded narrow bands, so lets just get on with it and implement it as soon as possible, thankfully its progress.
To make a judgement on another manufacturers product in such an undefined and casual way is irrelevant.
Most of us want Flex to be the best, so lets be a bit more scientific and precise before we criticize next time please.
I agree with you that PureSignal is a great technology and will ultimately help with crowded bands. However, the reality is that it won't have any meaningful effect for decades. Hams are cheap and as a group are going to spend as few $/watt they can. Older radios that are not capable of this technology aren't simply going to get replaced to help clean up the band.
I too want Flex to be the best, but I can think of a big list of stuff I consider more pressing than PureSignal.
Yes I am in broad agreement with you Jon.
What is it they say, 'A journey of a thousand miles starts with a single step'
Personally I may lobby our UK Radio Authority 'Ofcomm' to put all manufacturers of short wave Ham radio equipment on notice, that as from say 2020, all new manufacture Ham transmitters used in the U.K., confirm to tight IMD figures, which may force them to include some form of 'Pure Signal' in their fundamental design.
The genie is out of the bottle and for good sound common sense reasons.
After all, we have good legislation in the civilised world for all sorts of manufacturing and products, maybe its about time we tightened up on the HF spectrum and its proper use.
Its a valuable and powerful asset which we are privileged to be able to use freely and should not be abused.
"The proof is in the pudding" - if audio doesn't sound good something is amiss. Granted it may not be due to pre-distortion (PD) or perhaps the implementation of PD needs a tweak. Would have expected the developers of PD on the other vendors box to have tested on the air signals with / without PD to verify no audio degradation. Haven't seen test results - can anyone share a link?
I'm all for the PD, would even pay US$ for the feature, but think there are other items of priority before PD, specifically release of 1.4 / noise filters. Obviously, 1.4 is the train that is about to pull into the station and the filters would be nice but in my local not a must have.
Bear in mind the cellular systems (GSM / CDMA / LTE) are all digital transmissions whilst SSB is analog. I would expect PD to play well with SSB but maybe it doesn't.....
While on the subject of PD, the cellular folks are moving even further ahead with envelope tracking (ET):
Basically, ET reduces the DC voltage to the final PA when the RF crest is lower so the PA runs at a more efficient level. The DC voltage to the PA adjusts to a level to match the level where the device is most efficient. This is similar to the old school AM plate modulators I believe. I would suspect this would reduce IMD products as the PA is operating in a more linear region but haven't verified this in any references on ET.
ET in combination with PD should make a ultra-modern / clean / efficient PA. The downside to ET is the complex / cost of the PA power supply (which is not in our 6K boxes).
If Flex brings in PS I hope they can fix this, But it is likely just a part of how it works. Other wise we will all mostly sound much the same.
Yes Peter I am ready for another finger smacking for making another opinion comment.
The ssb sub-bands would be transformed if all manufacturers of dsp hf radios made the decision to implement adaptive pre-distortion in a timely manner. Amp manufacturers should start providing an attenuated output (BNC) for pre-distortion use by the exciter.
73, Barry N1EU
If you have the time, it would be interesting to post the same video (or even better, just an audio clip) but change APD every 15 seconds for say a 90 second duration. Only this time, don't identify when APD is on/off. Just announce when the switch occurs.
To make this even more interesting, announce a switch for one transition, but don't. If a video, mask the spectrum display. It would be interesting to see how well folks score among those who claim the presence of audible APD artifacts.
Useful discussion, Good information for once.
As long as PureSignal is included in SmartSDR 1.X or SmartSDR 2.X for the previously agreed upon charges ie. Free\$199.00 USD ..., then my preference is that it gets included in a 1.X release. If they want to hold off until SmartSDR >2.X to debug and fix PureSignal then that will just make me more likely to buy SmartSDR >2.X even sooner.
But I may hold off, and save my funds for a Flex >6700, and SmarterSDR, and PurerSignal. I don't even know what I'm doing right now, much less what I'll be doing in the future. I suspect I may never know such things.
73, Jay - NO5J