Strange ‘outer space’ signal turns out to be microwave oven...

[mcatrophy]

... ~2568000 mph (~4100000 kph)

and the Doppler shift will be the result of some fraction of that maximum number.

The speed and direction of the source would add to or subtract from that number, of course.

Cheers,

Infrared

Since I can't ride at the moment, I've nothing better to do ...
According to that Doppler calculator, 4100000 kph would shift 1500Mhz by about 0.38% or 4Mhz. I would still doubt you could tell whether or not that smear had been shifted by that amount. Even supposing they were all expected to cover the same frequency range from start to finish (which I don't know).

Hope to be getting back riding soon, then it'll be "Sorry, officer, I thought I was acting like a peryton smear, so wouldn't create noticeable Doppler shift on your radar gun."

 

[BigOgre]

Does anyone else hear

while following along here?

 

[infrared]

According to that Doppler calculator, 4100000 kph would shift 1500Mhz by about 0.38% or 4Mhz. I would still doubt you could tell whether or not that smear had been shifted by that amount. Even supposing they were all expected to cover the same frequency range from start to finish (which I don't know).Hope to be getting back riding soon, then it'll be "Sorry, officer, I thought I was acting like a peryton smear, so wouldn't create noticeable Doppler shift on your radar gun."

Mcatrophy,

Makes you wonder how those radar guns can nail you for 10 over the limit, right?

Monty Python to the rescue . . .

Heal well and quickly, my friend.

Cheers,

Infrared

 

[puppychow]

So, that radar gun reading is 'smeared' evidence?

 

[infrared]

So, that radar gun reading is 'smeared' evidence?

puppychow,

The radar gun sends out a pulse of known frequency, and measures the difference (the Doppler shift) of the returning (reflected) signal. Both the outgoing and incoming signals are exact frequencies, in extremely short bursts, and all the gun does is measure the difference between the two. The vehicle and the radar gun are on the same planet, so there is no smearing, as would be the case if the source and receiver were on different planets. As posted before, planets move a lot faster than wheeled vehicles. If the vehicle is braking, each reading of the gun would be lower, but the vehicle can not brake hard enough to confuse the gun. The radar bursts are too brief. The operator will "lock in" the first reading possible, so further braking gets no change in the reading.

Cheers,

Infrared

 

[puppychow]

Remind me not to call you to the witness stand to testify..

 

[infrared]

Remind me not to call you to the witness stand to testify..

Puppychow,

Your loss.

Some of these United States of America do not permit any timed speed-trap systems, and after the prosecution says that radar is "instantaneous," not timed, I can prove differently. "Calibration" issues can also defeat a speeding ticket, but the LEO may not like you much, later, so it helps to be "passing through" there, rather than a local resident. Either way, drive out slowly.

Cheers,

Infrared

 

[puppychow]

Okay. Remind me to call you to testify then .. as long as you are testifying for and not against..

 

[HotRodZilla]

Remind me not to call you to the witness stand to testify.. :no:

Puppychow,

Your loss. B) Some of these United States of America do not permit any timed speed-trap systems, and after the prosecution says that radar is "instantaneous," not timed, I can prove differently. "Calibration" issues can also defeat a speeding ticket, but the LEO may not like you much, later, so it helps to be "passing through" there, rather than a local resident. Either way, drive out slowly. :bye:

Cheers,

Infrared

Cough...********.

 

[Old Michael]

....As posted before, planets move a lot faster than wheeled vehicles.

You haven't ridden with ******* Fairlaner.

 

[bluesdog]

There once was a rider named Bright
Whose feej was much faster than light
He rode off one day, in a relative way
And returned on the previous night

 

[Niehart]

....As posted before, planets move a lot faster than wheeled vehicles.

You haven't ridden with ******* Fairlaner.

+1

 

[Pterodactyl]

I just activate my cloaking device and ride as fast as I want to.

 

[Old Michael]

*sigh*

 

[infrared]

Some of these United States of America do not permit any timed speed-trap systems, and after the prosecution says that radar is "instantaneous," not timed, I can prove differently. "Calibration" issues can also defeat a speeding ticket, but the LEO may not like you much, later, so it helps to be "passing through" there, rather than a local resident. Either way, drive out slowly.

Infrared

Cough...********.

HotRodZilla,

Hahaha . . . Fine, I love to be underestimated; it always makes things so much easier.

Lead tech, 30+ years in the radar repair/maintenance business.

Cheers,

Infrared

 

[ndivita]

I'm thinking they lost or misplaced Occam's Razor.