October 2020 Speaker Announced
The Desert RATS October meeting will be held on the 20th at 7:00 p.m. It will be a Zoom meeting, and will feature a presentation by Bernard, KG6FBM on the topic of Digital mobile radio (DMR)
The DMR standard operates within the existing 12.5 kHz channel spacing used in land mobile frequency bands globally but achieves two voice channels through two-slot TDMA technology built around a 30 mS structure.
Time-division multiple access (TDMA) is a channel access method for shared-medium networks. It allows several users to share the same frequency channel by dividing the signal into different time slots. The users transmit in rapid succession, one after the other, each using its own time slot.
CDMA is short for Code-Division Multiple Access, a digital cellular technology that uses spread-spectrum techniques. CDMA does not assign a specific frequency for each user placing or receiving a call. … TDMA technology divides a radio frequency into time slots and then allocates these time slots to multiple calls.
To attend the presentation, you will need to download and install the Zoom app, available here. We will be sending out a link to the meeting the day before – simply click on the link to attend the meeting.
