DMR
DMR Links
☛ Amateur Radio Notes - DMR
☛ Brandmeister.network
☛ Brandmeister Hoseline
☛ PAPA System
☛ RFinder.com
☛ RFinder.wiki
☛ SharkRF OpenSpot 4 Pro
☛ Ulefone Armor 20WT
RFinder B1-Plus
OpenSpot 4 Pro
OpenSpot 4 Pro from SharkRF
Issue: RFinder B1+ not hearing announcements/transmits in DMR UHF simplex from the OpenSpot 4 Pro.
RFinder.net/Customer Support Response/Info:
“I would like to acknowledge that the fact that the other radios are acknowledging when you transmit on your RFinder, simplex DMR does work. What simplex is, is the transmission and reception frequencies being the same. And this is working with the other radios.
The issue with the OpenSpot is that DMR spectrum is not at the typical 0 through (+) 1000 or so offset spectrum that most hotspots and radios use. In many circumstances, the OpenSpot hotspots actually use a (-)1000 offset, which can cause a misalignment in the DMR spectrum in some cases. Many radios have a broad DMR spectrum, whereas RFinder devices have a stronger, but more specific spectrum range that requires being within more direct range.
What I have been trying to do, is figure out where the range is for the OpenSpot hotspot for you. I was working with a user who had the OpenSpot 1 and 3, and said -1000 on the QRG offsets of his radio allowed it to connect, when he had the same issue as you. If you don’t mind, could you increment your radio’s QRG offsets back by -200 up until -3000? If your radio still does not work at that point, we will evaluate what the next steps will be.”
User Note:
Offsets -200 through -3000 were unsuccessful. Picked up a new B1+ at Ham Radio Outlet, and the unit works with the OpenSpot 4 Pro (hears announcements, tx, rx). It appears the issue was with the first unit itself; for some reason it wasn't compatible with the OS4 Pro. New unit - sideloaded current (Oct 20, 2022) RFinder .apk version without issue.
