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juribeparada / MMDVM_HS

MMDVM HotSpot: firmware for ZUMspot or MMDVM_HS based boards (D-Star, DMR, YSF, P25, NXDN and POCSAG)
GNU General Public License v2.0
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YSF VW Mode Not Detected When Modem Scanning #124

Open davidbeauchesne opened 3 years ago

davidbeauchesne commented 3 years ago

I have tested the issue described below on two hotspots: Hotspot 1: MMDVM HS Dual Hat (duplex) modem running firmware v1.4.17 Hotspot 2: Zumspot (simplex) modem running firmware v1.4.14

For either of the above hotspots: 1) Set the hotspot to scan for D-STAR and YSF. 2) From a Yaesu radio, transmit -- short or long -- in VW mode. 3) Modem does not recognize the transmission; i.e., it does not stop scanning. 4) Switch the radio to DN mode and transmit. 5) Modem recognizes the transmission and indicates YSF mode. 6) While the modem is still in YSF mode, switch the radio back to VW mode and transmit. 7) Modem recognizes the transmission.

Is there a problem with firmware version 1.4.x? Is there a work-around or fix?

David, AK2L

davidbeauchesne commented 3 years ago

I am reopening this issue. After some testing, it seemed that a stronger signal from the Yaesu radio would help the modem detect C4FM VW mode. That turned out to not always fix the problem. Also, I tested other modems (running v1.4.x) on other hotspots and they experience the same issue.