Appendix; Technical Notes On Cardio Receivers; Type Of Asic - Technogym spin trainer Maintenance Manual

SPIN TRAINER: Service & Maintenance Manual - rev. 2.0

11. APPENDIX

11.1. TECHNICAL NOTES ON CARDIO RECEIVERS

The receiver shown in the figure below is equipped with:
• an antenna a, designated the "coil", which receives the signal from the transmitter strap worn by
the user.
• an integrated circuit b, designated the ASIC, which has the function of filtering the analog signal
and generating a pulse train corresponding to the received heart rate.
• two contacts c parallel to the coil, on which a 15 KOhm resistor is sometimes mounted.
The following paragraphs contain various suggestions regarding the cardio receivers, which may be
useful for improving the reception of the cardio signal.
11.1.1. T ASIC
YPE OF
The cardio receivers can be equipped with 3 different ASIC models, identifiable by the code marked
on the component: MAS, FTC or HRRE. These ASICs are characterized by different reception
ranges and different levels of immunity to noise. Tests have determined that the maximum reception
distances are as follows:
As regards sensitivity to noise, the best ASIC is the HRRE model. This ASIC is also the one
recommended by the manufacturer.
Figure 11.1-1
ASIC DISTANCE
(cm)
MAS 90
FTC 100
HRRE 85
Page 11.1