E.Molinari on Trackman vs Flightscope

[ParHunter]

Isn't the problem with running multiple launch monitors that the radar signals could potentially interfer? I would expect that a launch monitor modulates the signal with a pseudo random sequence e.g. a gold code. Through correlation of the received signal with its gold code it can calculate the runtime length of the signal and 'ignore' other signals as the cross correlation will be very low.

So if two launch monitors use different codes they should work in parallel. Now the question is does every TM uses a different code? Is there a limited set? Could there be two machines with the same code?



Disclaimer: The use of gold codes is just a guess based on how other system work which need to measure signal runtime length and which receive multiple signals in parallel (e.g. GPS GPS explained: Runtime Measurement of the Signals)

 

[Burner]

May sound silly, but you should also test 2 trackmans together to see what differences are, and 2 flightscopes together too.

May sound silly but how would you ascertain which of each pair was giving the most accurate information?
Just wonderin'.

 

[mgranato]

The frequency of the transmitter is indicated on the label on the device. My X2 is 10.505 Ghz. As long as there is adequate separation of frequencies there should be no interference. (think fm radio tuner.)

The freq on my X2 is 10.542 Ghz. Do you know what sort of range is adequate for there to be no interferences with that frequency?

 

[GaryC_47]

The freq on my X2 is 10.542 Ghz. Do you know what sort of range is adequate for there to be no interferences with that frequency?

I couldn't get a definitive answer to that question. I think it depends on more than just the frequency.

For my tests the Trackman was at 10.524 Ghz.

My X2 works at 10.505 Ghz.
My boss's X2 works at 10.547 Ghz.

10.505 was too close to the 10.524 and "over-powered" the Trackman. DIFF .019

10.547 played nice with TM at 10.524. DIFF .023

The two X2's worked fine together.

 

[mgranato]

It seems the same brands don't have any trouble working together, but the inter-brand work seems to be much more sensitive. Interesting.

Probably a very remedial question, but are the higher frequency numbers emitting stronger signals?

 

[GaryC_47]

It seems the same brands don't have any trouble working together, but the inter-brand work seems to be much more sensitive. Interesting.

Both brands use the same (EDH) radar hardware. FS has one more receiver, and a different receiver configuration, which gives it a higher sampling rate making it easier to filter the noise from the data. That's why FS is better on grass, for example. So we'll probably never see identical club head numbers.

But the greater the frequency separation the better the results in side by side tests. I've never seen frequency mentioned in side by side comparison tests published on the Internet. Curious.

Probably a very remedial question, but are the higher frequency numbers emitting stronger signals?

The frequency is not related to the strength of the signal. Think of it as a different tv channel. Of course there could be differences in signal strength between individual units.

By the way your side by side test diagram is exactly how I set up my tests.

 

[Frans@France]

For my tests the Trackman was at 10.524 Ghz.
.

Thanks for the remark! seems I never took a good look at the back of my TM unit

There should indeed be an ideal freq difference between the units otherwise also the TM range units would interfeare with each other.

 

[mjstrong]

The information on this site is so cool...
Great thread.