1. ## 34.0 and 34.1 GHz KA Alert - 8500 x50

All,

I received a 34.0 and 34.1 GHz KA alert all the way down the expy today. Any ideas what this could be caused by? I thought the normal freq's are 33.8, 34.7, & 35.5.

2. ## Re: 34.0 and 34.1 GHz KA Alert - 8500 x50

How old is the detector?

I'm going to guess that the spec display or the radar gun was out of tune and MPH.

3. ## Re: 34.0 and 34.1 GHz KA Alert - 8500 x50

I have a question that might keep this on subject. I always wondered when we receive an alert and the frequency is not exactly 24.15 ghz, 33.8 ghz, 34.7 ghz, or 35.5 ghz, we assume either our RD's or the RADAR is out of tune; what about receiving the RADAR signal from reflections or even multiple reflections? Would the RADAR signal frequency be changed after say multible reflections? Even if the RADAR signal is being bounced off of a stationary object multiple times?

4. ## Re: 34.0 and 34.1 GHz KA Alert - 8500 x50

Originally Posted by Ray
what about receiving the RADAR signal from reflections or even multiple reflections? Would the RADAR signal frequency be changed after say multible reflections? Even if the RADAR signal is being bounced off of a stationary object multiple times?
Reflecting off stationary objects won't change the frequency. But the radar is subject to the doppler effect, so if it reflects off of moving objects it can change the frequency. But, not enough to register on the spec display of radar detectors.

For K-Band, it changes it approx. 72 Hz per MPH. So at 100MPH, it would be 720 Hz off the original frequency. The spec diaplay shows out to 3 places after the decimal, so 1 MHz, or 1,000,000 Hz. But in reality, testing has shown that the spec displays have step sizes of 12-15 Mhz, and can be 30 MHz off of the actual frequency.

5. ## Re: 34.0 and 34.1 GHz KA Alert - 8500 x50

Originally Posted by jimbonzzz
Originally Posted by Ray
what about receiving the RADAR signal from reflections or even multiple reflections? Would the RADAR signal frequency be changed after say multible reflections? Even if the RADAR signal is being bounced off of a stationary object multiple times?
Reflecting off stationary objects won't change the frequency. But the radar is subject to the doppler effect, so if it reflects off of moving objects it can change the frequency. But, not enough to register on the spec display of radar detectors.

For K-Band, it changes it approx. 72 Hz per MPH. So at 100MPH, it would be 720 Hz off the original frequency. The spec diaplay shows out to 3 places after the decimal, so 1 MHz, or 1,000,000 Hz. But in reality, testing has shown that the spec displays have step sizes of 12-15 Mhz, and can be 30 MHz off of the actual frequency.
Aha! What a glaring obvious mistake with misleading information this is. At 100 mph with 72 Hz per MPH that would be a 7.2 Khz difference!

Of course it's immaterial in that everything else that JimBonzzz stated is still accurate and great info. It's just that one does not find the Professor making a boo-boo..........even one decimal off..........very often.

6. ## Re: 34.0 and 34.1 GHz KA Alert - 8500 x50

Originally Posted by nine_c1
Originally Posted by jimbonzzz
Originally Posted by Ray
what about receiving the RADAR signal from reflections or even multiple reflections? Would the RADAR signal frequency be changed after say multible reflections? Even if the RADAR signal is being bounced off of a stationary object multiple times?
Reflecting off stationary objects won't change the frequency. But the radar is subject to the doppler effect, so if it reflects off of moving objects it can change the frequency. But, not enough to register on the spec display of radar detectors.

For K-Band, it changes it approx. 72 Hz per MPH. So at 100MPH, it would be 720 Hz off the original frequency. The spec diaplay shows out to 3 places after the decimal, so 1 MHz, or 1,000,000 Hz. But in reality, testing has shown that the spec displays have step sizes of 12-15 Mhz, and can be 30 MHz off of the actual frequency.
Aha! What a glaring obvious mistake with misleading information this is. At 100 mph with 72 Hz per MPH that would be a 7.2 Khz difference!

Of course it's immaterial in that everything else that JimBonzzz stated is still accurate and great info. It's just that one does not find the Professor making a boo-boo..........even one decimal off..........very often.
Thank you Jimbonzzz and nine_c1, for learning me something tonight!!

7. ## Re: 34.0 and 34.1 GHz KA Alert - 8500 x50

Originally Posted by Ray
Thank you Jimbonzzz and nine_c1, for learning me something tonight!!
All credit for this lesson goes to Jimbonzzz! I was just pulling his chain a bit.

8. ## Re: 34.0 and 34.1 GHz KA Alert - 8500 x50

Originally Posted by nine_c1
Originally Posted by Ray
Thank you Jimbonzzz and nine_c1, for learning me something tonight!!
All credit for this lesson goes to Jimbonzzz! I was just pulling his chain a bit.
That's cool, what's a decimal point anyway.

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