Heart Monitor ?

Thanks, Doug, I get to play with both tomorrow.

Peakbagr said:

Thanks, Doug, I get to play with both tomorrow.

Click to expand...

For a worst-case test, try holding the GPS close to the sender. (Actually, the shoulder strap location isn't all that far from the sender...)

Doug

DougPaul said:

The HRM sender uses a low-power radio transmitter to communicate with the indicator (receiver). I am unable to find the frequencies using a quick Google search, but the GPS frequencies are reserved and the HRM should not be using them.

Click to expand...

HRM are 2.4GHz ISM/"kitchen sink" bands (I think some are on the 5.x band now); mine would go on the fritz running past the LMA. Apparently GPS is mostly on 1.5GHz.

Thanks all. Worked fine yesterday.

jniehof said:

HRM are 2.4GHz ISM/"kitchen sink" bands (I think some are on the 5.x band now); mine would go on the fritz running past the LMA. Apparently GPS is mostly on 1.5GHz.

Click to expand...

GPS frequencies:
* L1: 1.57542 GHz
* L2: 1.2276 GHz
* L5: 1.17645 GHz

* Hiking and consumer GPSes use L1.
* Military and surveying GPSes use L1 and L2.
* L5 is new and not yet supported by enough satellites to be useful.

The HRM transmitter should be clean enough that it will not interfere with the GPS frequencies. There has been at least one case of a malfunctioning amplified TV antenna interfering with GPS reception over a significant portion of a harbor...


LMA?

Doug