VEMCO - VR2Tx Manual
15 March
2019
37
6
Additional Information
6.1
Flash Memory
The VR2Tx receiver uses a non-volatile Flash Memory (memory that can retain stored information even
when not powered) to store valid detections of coded transmitters and the date/time at which the detection
was recorded. The VR2Tx will not continue to record received data once the memory is full.
6.1.1
Time required to fill memory
A VR2Tx receiver with 16 MB of memory can store more than 1.6 million detections. How long it takes to
fill the memory depends on how frequently the data are received. For example, if a valid detection is
received every 20 seconds then it will require approximately 365 days to fill the 16 MB VR2Tx memory. It
will take less time if the detections are received more frequently, as illustrated in the table below.
Time required to fill VR2Tx memory based on variable detection time.
Valid detection every…
Time to fill 16 MB memory
20 Sec
12 months
30 Sec
18 months*
40 Sec
24 months*
50 Sec
30 months*
60 Sec
36 months*
*
Exceeds battery life of the VR2Tx
6.1.2
Time required to offload
The time required to offload the data from a VR2Tx depends on how much data is stored in the memory.
Table 6-2 below lists the approximate times required to offload data from a VR2Tx based on the amount of
data stored in memory. These times are approximations only – actual offload times can vary on a number of
factors, including the distance between the receiver and PC, the number of connected Bluetooth devices, and
any obstacles between the receiver and the PC that can cause interference. Offload times can also vary if a
Vemco-supplied Bluetooth dongle is not being used (i.e. built-in Bluetooth radios in laptops).
Time required offloading data from VR2Tx to PC based on various amounts of data.
Amount of Memory Used (MB)
Time to offload from VR2Tx (minutes)
1
1.6
2
3.3
4
6.6
6
9.8
