Then roll back to the previous FW and see what happens.
You can obtain it at the bottom of the linked page...
SDS100/SDS200: Uniden's Official SDS100/200 1.24.00 Main (12/20/2025) discussion
- Thread starter jasonhouk
- Start date
You can obtain it at the bottom of the linked page...
How do I go about going to the previous one. I can't roll back in Sentinal. I've never done a roll back before. I'm willing to try though.
Download the below file...
Connect the scanner to the computer and enter MSM on the scanner.
In windows explorer locate the scanner drive and copy the firmware file to the firmware subfolder.
Safely eject the drive then reboot the scanner.
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Couple of things, why does the folder contain item as old as March 2024, 1.23.20 was the previous. It's telling it's got .07
Also, where is the scanner drive and subfolder? Names? I'm lost.
The link has instructions on how to perform the downgrade. Be sure to use the current link as I posted an earlier version but updated the link in my post.
Perfect. Got it installed. Thank you. Will try to get a better look at things now.
1.23.20
1.03.15
Don't make any other changes as that will skew the results. And you can go back and forth between these 2 for testing. I highly suspect the current FW is not the cause of any perceived issues you have though.
Early suggestions are pointing to needing to use the Invert Filter for the sites on this particular system. I've went back now to 1.24.00 with the filters in place and I'm hearing this system again. But with the filter off or on normal gets 0 signal.
I'm guessing that one of the new control channels that are close to me on another system that is replacing this system that uses the same area of frequencies is the culprit to possible interference that at first I didn't think was there. That site apparently is closer to me than I had originally thought.
The SDS200 however is still a bit deaf though in some areas of vhf however compared to the 436. Yet, in some instances when having finally connected to my outside antenna with the SDS200 from this other room than my actual radio room it still nets results on a few other frequencies that I didn't think I would get. This filter change at the moment now allows me to atleast hear 1 site of the needed system. On the 436, I can hear atleast 2 sites.
Now that I know how to go back and forth in firmware, I'll keep my eye on things a bit closer to see if there are any other changes.
I'll keep having a listen over the next little bit again to see what my captures are for frequencies that I am getting.
Chris0516
Active Member
Sorry to jump in here. Can I set that filter, per system, or. Is it always just Global?
Per site on a system. Or a department in conventional mode.
Chris0516
Active Member
Thanks
I_Am_Infinite
Member
U try wide invert or any other filters? I use wide invert on my SDS 200 for my systems definitely helps the decode and alot less D errors. Might help might not worth a try though
I also use Wide invert
Regular I think is good enough. I don't want to slow down the scanning too much more. How different is the wide invert?
I think if they're gonna keep the filter changes, then it would be better on a channel by channel basis on a conventional channel/frequency instead of on the department level. Some frequencies may or may not need the extra filtering.
Search mode on the SDS200 skips alot of potential active channels while searching, doesn't matter which band. I know there's frequencies that it should stop on, especially when it's a control channel found upon searching. Sometimes it will skip over certain frequencies while in search mode. One thing I have been looking at lately is the RSSI and dBm on channels. It looks like about -120dbm is the thresh hold. I think search mode on the SDS200 could be better.
It appears so far that my issues were pertaining to really diving into and now needing the filtering. I didn't before. So my issue wasn't actually with the FW update by the looks of it.
I still think the 436 still scans better and picks up signals better than the SDS200 atleast in my situation.
Search mode on the SDS200 skips alot of potential active channels while searching, doesn't matter which band. I know there's frequencies that it should stop on, especially when it's a control channel found upon searching. Sometimes it will skip over certain frequencies while in search mode. One thing I have been looking at lately is the RSSI and dBm on channels. It looks like about -120dbm is the thresh hold. I think search mode on the SDS200 could be better.
It appears so far that my issues were pertaining to really diving into and now needing the filtering. I didn't before. So my issue wasn't actually with the FW update by the looks of it.
I still think the 436 still scans better and picks up signals better than the SDS200 atleast in my situation.
I_Am_Infinite
Member
I don't notice any difference between off and wide invert, there might be but I don't notice it.
What I observered, the scan seems to scan faster when filter is set to off
Ubbe
Member
You have to be careful with that, using it as an indicator. If it scans faster it could mean that it doesn't receive the signal properly and skips systems if the squelch doesn't open due to de-sense that blocks reception. On the other hand if the squelch opens on a lot of interference signals that it shouldn't receive then that will slow down scanning. There's really no good way to tell what's the preferred setting when looking at scan speed.
It would be interesting to know what frequencies the IF filters are using in the SDS150 and if they are the same it might be possible to replace the filters and don't have to deal with these difficult to handle filter settings. But it would take a Jon Wienke type of guy to make those modifications but he seems to only write SciFi novels and hasn't returned to the scanner hobby. But on his Facebook page it now says "Former member of Science Fiction Writers" so I'm not sure what he does now.
/Ubbe
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Adding Features to the BCD996P2/BCD325P2, BCD536HP/BCD436HP, SDS200/SDS100 adds to the amount of Flash Memory used. It has been said by UPMan when he was still posting that the P2's and the x36's had limited Flash Memory Available UPMan never did get to tell us how much space we had to work with in the SDS's.
For current firmware versions, the amount of free flash memory is:
- BCD436HP - 380KB
- SDS100 - 90KB
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