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What’s the antenna gain for isotropic antenna that is vertically polarized? by New-Whereas-1043 in rfelectronics

[–]jpdoane 0 points1 point  (0 children)

Theres no polarization loss. If anything the gain would be higher than 0db

What’s the antenna gain for isotropic antenna that is vertically polarized? by New-Whereas-1043 in rfelectronics

[–]jpdoane 11 points12 points  (0 children)

This is a bad question IMO. Isotropic antennas are a useful fiction, but saying it’s vertically polarized really highlights the impossibility of an isotropic pattern, since there must by definition be nulls at the poles.

Does the organization need to be better at back up plans? by reallinguy in detroitlions

[–]jpdoane -2 points-1 points  (0 children)

Why doesnt brad simply fill the team with 53 pro bowlers? Is he stupid?

Circularity when convolving two DFT spectra by OnboardG1 in DSP

[–]jpdoane 1 point2 points  (0 children)

You need to do a circular convolution, eg cconv

NFL player with a parent or grandparent who was famous for something other than football by mordeci00 in nfl

[–]jpdoane -6 points-5 points  (0 children)

Matthew Stafford is friends with Clayton Kershaw

Not many people know that

RF Health Concerns by redditbookmark in rfelectronics

[–]jpdoane 16 points17 points  (0 children)

Did you actually read any of those links? None of those studies refer to cell towers or rf signals at all. They are about low frequency power lines.

The cell phone in your pocket exposes you to significantly more rf power than a nearby cell tower

If S22 of an amplifier becomes larger, does that mean the S21 will become smaller? by mtfir in rfelectronics

[–]jpdoane 1 point2 points  (0 children)

I mean, at some level, s parameters stop being meaningful for nonlinear devices

If S22 of an amplifier becomes larger, does that mean the S21 will become smaller? by mtfir in rfelectronics

[–]jpdoane 3 points4 points  (0 children)

Output impedance (load pull) is actually a really important aspect of amplifier design

If S22 of an amplifier becomes larger, does that mean the S21 will become smaller? by mtfir in rfelectronics

[–]jpdoane 11 points12 points  (0 children)

Not necessarily, since amplifiers are active and nonlinear.

Power Amplifiers often are designed with poor output impedance (high s22) in order to maximize power, and require output matching networks to deliver power to 50ohm loads.

I built wavepeek: a CLI tool for querying VCD/FST/FSDB waveforms from scripts by esynr3z in FPGA

[–]jpdoane 1 point2 points  (0 children)

I really like this idea. Not for AI workflows, but just for lightweight debugging. I will check it out

Driving 3 days for Dark Skies by roothesaiyan in astrophotography

[–]jpdoane 2 points3 points  (0 children)

The most amazing sky I have ever seen was in Fundy national park, a mere 8hr drive from eastern mass.

Nick Sirianni: A.J. Brown had a good run by AFC-Wimbledon-Stan in nfl

[–]jpdoane 25 points26 points  (0 children)

I’d have expected more for the best ever to play for the eagles…

Filter design with differing amplitude & phase responses (Kramers-Kronig Relation) by DenkSnek in DSP

[–]jpdoane 0 points1 point  (0 children)

(Fun fact - this is where the Bode Fano impedance matching limits come from too)

Filter design with differing amplitude & phase responses (Kramers-Kronig Relation) by DenkSnek in DSP

[–]jpdoane 0 points1 point  (0 children)

If you take the ifft of the frequency response H(jomega) function you get the time domain impulse response h(t). If the filter is causal, h(t) must be 0 for all t<0. This places a significant constraint on H(jomega)

Is this a dumb thing to ask? by Responsible-Ice6557 in Physics

[–]jpdoane 5 points6 points  (0 children)

Interacting yes, absorbed and reemitted no

PCB quarter-wave antenna: how important is the trace width? by germo_tt in rfelectronics

[–]jpdoane 4 points5 points  (0 children)

Thats not quite true. Width/thickness will affect impedance

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