crevatis
Member
Does anyone have the previous firmware? This update turned a decent scanner into a $700 piece of garbage. It barely receives UHF signals now.
SDS100/SDS200: How can I go back to the previous firmware
- Thread starter fasteddy64
- Start date
Before you revert back, try changing the modulation from FM to NFM or vise versa. Also, try increasing the freq. 2.5KHZ. So if the freq is 460.2125, make it 460.215. I had to make these adjustments, and my UHF is better than ever. Equal to my Whistler scanners now after the new firmware. And I can set the squelch closed now to setting 2 and the radio scans and UN-squelches even with the weakest signal.
crevatis
Member
That made the signal even weaker. I really just need to find a way to get the firmware that worked loaded again.
crevatis
Member
However that did lead me to investigate with the waterfall. It looks like in my case it looks like its off frequency slightly in the other direction. If I could adjust it maybe 1KHz lower, it would probably fix it. Unfortunately, I don't see anyway to do that.
crevatis
Member
This is supposed to be on 461.925, but is slightly high. Came in great before the update and still great other the 536. Changing it to 461.900 would be too lower. Wish there was a middle ground or better yet a way to tune the scanner on this band to put it back on frequency.
there is a thread about addressing the off frequency condition seen in some scanners.
forums.radioreference.com
Remember too that the waterfall may not be 100% accurate on the center frequency.. Also there is no guarantee that the transmitter being received is on frequency either. Finally there is a possibility that the system being monitored is using a .00625khz step. Either way being able to adjust the scanner to a known on frequency reference is highly desirable.
Uniden tuner utility needed.
This is a spilt off the SDS200 waterfall thread. To Uniden. Many of your in service scanners 436/536/100/200/992 are starting to show frequency drift. The dirft is usually only 300-1000hertz. This is enough to cause decode and channel capture issues for the end user. Especially on P25 Phase...
Remember too that the waterfall may not be 100% accurate on the center frequency.. Also there is no guarantee that the transmitter being received is on frequency either. Finally there is a possibility that the system being monitored is using a .00625khz step. Either way being able to adjust the scanner to a known on frequency reference is highly desirable.
Adjust the Gain, Check the steps.
I'm seeing any evidence of it being back. Holding on one site and signal bars are absolutely solid.
Is it possible you are overloding the front end or you have desense? -60 db is pretty high. Try turning on the attenuator for that system.
Yea, this radio is actually doing a fairly decent job on the system - Unitrunker is better however. The "housekeeping" also occurs with a SDS100 when using a Remtronics antenna inside a vehicle, within the service area of the system, with or without attenuation enabled. The SDS100 is almost unusable as most transmissions fail to complete before digital breakup. Used to work great before the firmware upgrade. To clarify, the SDS200 is located outside of the service area, so likely not receiving as many subsites simultaneously as the SDS100 does when in the service area. There is a Stridsberg preamp in the line, otherwise there would be no usable signal from the outside antenna. Attenuation on the SDS200 brings the signal down to ~105 dBm, still have the housekeeping.
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Was that supposed to say "NOT" seeing...
Yes. I thought you were a mind reader.
And apparently you are.Mine did same thing on new firmware on two different p25 systems. I flashed old firmware back and it is back to normal.
Did you change your profile from the sds100 to your sds200 properly? Or do you use exactly the same profile on both?
Try adjusting the filters.
OK fellas I need some help here my SDS200. I cannot flash it back. I tried everything I even wiped it clean and I cannot get the film where to update on the SDS200.
Others here have already done this and it works the old firmware is here you just have to get it from a user. The directions are here they were posted by UPMan you just have to find the post and follow the directions and not skip or get the steps out of order.
Ubbe
Member
The attenuator will reduce the signal 20dB in the 800MHz band. If it went from -60dBm to -105dBm it is a 45dB reduction that indicate some kind of RF issue from overloading. If any filter or IFX setting works it should probably give a signal level in the -85dBm region when it is interference free.
/Ubbe
You are assuming that the RSSI indicator / measurement is working correctly. As I mentioned previously, this radio (SDS200) is not really having issues as it is located outside the the simulcast cell's service area, thus likely only receiving signalling from one subsite most of the time. When the SDS100 is connected to the same antenna system, it performs similarly. However, if that same SDS100 is moved into the system's service area - in view of multiple (powerful) subsites - this is when the fun happens. Most transmissions begin to break up and are dropped. The DEC count goes from zero to numbers in the hundreds when this occurs. Unitrunker does not have this issue in the same vehicle, and I suspect my XTS will not either. The SDSs did not behave this way prior to the firmware update as they worked perfectly fine on SmartZone systems.
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