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Picking up on Greg's suggestion to look at the DSP transmit chain with a " swept tone into the T41 microphone input ", I ran the chain through my network analyzer.? I excluded the Hilbert transform

Relative to the +/-45 vs 0/90 arrangement of the Hilbert, last night I did an Octave look at two cases: A - The +/- 45 100-tap FIRs from the current KI3P Github. B - An 199 tap 90 degree plus delay

Understood. I'm not planning to shell out >$5K for one when it becomes available either. Thus the "for what its worth". My point was that EER has now broken though to commercial ham equipment. And

Hi Al, what was the PEP when you recorded the two-tone measurement?? I made the same measurement recently, but that's a sample of one.? I was hoping someone else would duplicate the test. -- 73 Greg

Can anyone tell me if the changes made regarding the MF frequencies are documented anywhere?? Were changes made in the BOMs or assembly manuals for the affected boards?? I have been unable to find

*** Since Flex's stuff is totally closed source, it really doesn't matter to me what they do. I just read Hans' article. Amazing! I was thinking - how to use this technique with higher power? The part

Phil, thanks for the input. I was able to find the ones I was missing from Mouser and DigiKey. I had ordered the BOM months ago but some values were not available. However they were only available in

I had a conversation with Hans about this, and it was our feeling that it was probably not worth the extra overhead and additions to the hardware, since the K9HZ amp is running in a much more linear

That's a nice program!? I've been using Octave in my DSP experiments.? Usually, Matlab code will run in it with little modification.? I've designed filters in it to run on the Teensy, but I never

Bob Where did you get with this? I just ordered 500V, 630V or 1kV instead. LCSC always have good pricing, rather than Mouser and DigiKey. Most caps at LCSC were around 3-20 cents pre-tariff, I always

FWIW Flex's new transceiver (the Aurora ( https://www.flexradio.com/aurora/?srsltid=AfmBOooHr-uT5LeSvoQ8J0Vefce37bc6MbigUR3oa64vpQUmLMLW3Qq6 ) ) also uses polar modulation (aka EER Envelope

I made the plots using Python matplotlib library which is heavily inspired by Matlab, so I'm not surprised you thought that! I switched from Matlab to Python about 15 years ago when I got sick of

I saw the inconsistency in the coefficient array sizes and six of the init functions but then saw that the coefficient arrays seemed specially structured for this type of dual use.? I figured it was

Here's the missing second plot -- much better!

I'll investigate this too, thanks for all the great advice! I'm testing each of the transmit DSP steps individually. I've found another issue -- the number of taps in the initialization of

A picture is worth a thousand words. This uses half the bandwidth as in my earlier post!? And cleaner upper sideband as well. Greg mentioned to me the other day that applying the Hilbert filter at a

Ok.? But the coefficient from in v50 labeled 90 and 0 don't follow that pattern.? And all of the +/- 45 degree coefficients I've seen are the same but reversed.? That's a limited set though so I'm

It appears they are +/-45.? The 90 deg case only has one set of coefficients for I (an odd number) plus a simple delay line for Q.? And every other coefficient is zero.

I think it's on topic.? While the current v66-9 Hilbert coefficients are labeled +/-45 degrees, I speculate that they're actually +90 and 0 degrees.? The label doesn't really matter, but

Hi - I hope this is not off-topic.? The basic question is why +/-45 deg phase shift?? I was raised with 90 deg plus delay (as is in the OA_F32 library).? What is the advantage of +/-45?? Bob * *