mrlithium , It is hard to fault Shariar for anything.

I agree, it's not Shariar fault I don't understand something; however, it did seem that Shariar did slow things down a little bit in this video, which indeed seemed to help me understand a little more of what was going on.

I can only DREAM that I'd start watching a TSP video at a 2% level and end up at 10%... I would GUESS that I'm more like 2ppm ending at 10ppm! (But I am definitely NOT complaining!!! I'm still learning from each and every video he makes!) I'd suggest that I am more of a DC guy (assuming DC is anything below the 2.4GHz ISM band)

I agree, same here, but even then its still very advanced now all the time...

Shahriar yes please do as Amcia Apple suggests and maybe make that "back to basic" such that over time have you filled the gap from noob to advanced. :-) Edit: Sorry forgot to write, you have so much amazing gear that mostly is outside what a noob can use or understand. Why not once in a while talk about the gear that will be great for one that wants to start the journey out in HF?

@@friedmule5403 , It is hard for someone like Shariar to instruct such a wide variety of human needs. Perhaps some basics as to "things the average person may need to measure what needs to be measured in a home lab or in an amateur radio situation." I might suggest what types of STANDARDS are available and necessary, also.

I assume the influx of these comments is due to the growth of the channel. In the beginning most viewers were working in the field or people that are into this equipment due to their hobby. Over time the channel attracted more of the general electronics people who don't necessarily have a background in HF electronics. I agree that a HF basics series would make sense as it would build a catalogue of videos to reference the questionnaires to, thus reducing questions about basics in the comments.

@@BruceNitroxpro You are perfectly right! I look at it like this, Shariar is an amazingly skilled person in a field of electronics not many matches and it would be a big loss if Shariar converted his channel to a beginner channel, you find hundreds of channels for the beginner. And to be honest, if you need to learn about Ohms law while following this channel, then are you on the wrong channel. But Shariar is so far beyond the next channel in some situations that there is nobody to close the gab and since Shariar is maybe one of the leading experts in HF and have taken the journey from noob to expert do I feel he may be the single best to advise on i.e. gear, because he does not only understand the needs but also understand the gear in ways even the designers may not understand. :-)

@@friedmule5403 yeah, it's just such a big jump from the next thing down

Pixel Schnitzel , Well said. I agree!

That's excatly my thought too.! High directivity 45MHz - 26.5 GHz directional couplers a an engineer's masterpiece !

He was just 'polishing' them!!!

Glad you like the videos. I don't actually control the processing. KZfaq sometimes takes longer for the 1080p version to become available.

Thanks for the feedback. I’ll turn the intro music down.

@@Thesignalpath It isn't a huge difference. But it is a bit loud, or it could be the rest of the video that is on the quiet side. But a few tips and tricks. I think you can get an audio track visualizing the volume over time in most video editors. Giving you the ability to quickly see any drastic changes. A general rule of thumb is to aim to be within about 3 dbc from one audio clip to the next for it to have a similar volume. It is generally more important to watch the average volume than the peak volume. (box car over a few hundreds of ms. (Audio techs still use panel meters for a reason, they have "good" averaging.)) After all, a regular person talking at 60 db can still reach peak volumes up in the high 70's. In regards to volume differences, a 10 db increase is generally considered to be about twice as loud by the human ear. Staying within 5 db is a noticeable change by most people. And 10-15 db is the difference between someone talking quietly in a movie, and an explosion packed action scene. One can use a drop in reference sound as a sanity check and then just get it in the same ballpark by ear. If the reference is louder than the video itself or vice versa, then there is an imbalance in the level and one then changes the video's audio level accordingly. (A reference sound can be almost anything, except a pure tone since that is clearly heard through almost anything, the ear is practically a real time spectrum analyzer. With 1 selectable input attenuator of about 15 db, controlled by the stapedius muscle during the the acoustic reflex) One reference clip could be the intro music itself. Another advantage of a reference audio clip is consistency from one video to the next. One can also use an audio compressor to flatten the volume, but this is generally more useful if one live streams. Since it can compensate for varying distances to a microphone or sudden loud sounds etc. (I though use a compressor on live performances to save me the time of twiddling the fader when people hand a mic back and forth between each other.) Also, in regards to the complexity of the video topics, I think it honestly is nice. Sometimes you are talking about things way above my understanding, but I have learned a lot. Though still have glaring gaps in my knowledge, like QAM modulation is something I understand, but single side band without tons of filtering is magic... I partly understand it, but can't explain it. Would also be nice to know more about RF couplers and how they differ from circulators.

Thanks!

Both.

Right now on ebay there is a complete unit for just under $500. This is considered obsolete by the industry. There still are people out there "upside down" on these instruments trying to sell them for higher price than more modern instruments can be bought for!

i was gonna ask the same thing, why?

KZfaq takes time to convert videos longer than 10 minutes, try back in 20 minutes

One of the other comments references Julius Botka's patent. It's very informative, worth looking up. DrJoel's book is also a good resource.

@@NoahFect thanks for bringing this to my attention, you made me look at the amazing comment chain by dunsmore. The patent is shockingly understandable, I had expected it to be fully patent-speak, but it looks like it was at least in part written by engineers, not lawyers. Those were the good old days :D

The other bidder on the auction......

@@SeanBZA The person that sold the unit!

Those prices are for suckers. There is a whole unit for under $500 right now on ebay. They are not that rare. The REST of the system is what is expensive!

@Joel Dunsmore Thanks Joel. So IC technology is here indeed the main driver. The bridge with a typical 2/3 and 1/3 divider and 2 diffamps should be anyway significant smaller than a wavelenght. Where the directional couplers operation is based on size large to the wavelength. Mixer, ADC and processing profit obvious from IC tec. Key point is: Wave direction could measured with a simple voltage divider.