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Ubbe
Member
DMR signalling uses forward error correction to restore missing bits in the data stream, that almost always happens when tranmitting thru airwaves. RAS uses a special key that makes the checksums not match up and you can no longer do error correction without the proper key.
In Unidens scanners they considering a high rate of biterrors as a bad signal with low signal strenght and use it as a squelch. To be able to follow DMR RAS transmission you must disable the biterror/squelch relation and figure out some other way to control the squelch. I guess it must be a signal strenght check being done when there is a high biterror rate. It's a fine balance trying to find the exact levels when to decide it is RAS or just a bad signal. Setting the signal level too high and you get ghost decoding as the forward error correction are disabled in normal DMR which make it sensitive to even the slightest biterror.
RAS are Motorola propriety (to only allow Motorola radios in the system) and no one are allowed to use its funcionality. But DSD+ are developed by people that do not disclose their identity and don't care about infringing patents, licenses or use copy righted material.
/Ubbe
on VHF high band .Poorer reception since 1.22.. and when in search any digital is all noise and no signal bars just the digital buz sound.. also signal strengths seem even weaker then 1.21 and analog is crap.... will not receive in scan mode even in nfm and threshold set to auto as suggested.. Will pick up if I put the channel hold on however signal strength is super weak
even on weather 162.4 which used to be 5 bars now only 1 signal bars and our multicast p25 system nolonger gets any hits at all..
what is going on?
almost like the antenuator is on tho it is indeed OFF
even on weather 162.4 which used to be 5 bars now only 1 signal bars and our multicast p25 system nolonger gets any hits at all..
what is going on?
almost like the antenuator is on tho it is indeed OFF
I just went on the 436hp and did a wx scan I only get 162.550 with full bars using a RS 800 antenna. FW 1.22.00.
I would agree. Mine receives just the same as it did with 1.21, which received the same as 1.20, which received the same as...well, you get the idea.
And it just so happens that I had mine on the service monitor today testing something else and the sensitivity was just the same as it was a couple of weeks ago.
It's possible the "signal bars" may have a different reference now ( I usually don't pay much attention to them), but sensitivity on my unit is the same.
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Might be coincidence since it was not in the Change Log for the latest update. But my 536 no longer reboots when I start the vehicle. No new battery or any other change to the vehicle electrical system. But the 536 now “survives” an ignition start of the engine.
Monitoring VHF with an antenna tuned to 800MHz is extremely inefficient. You're not going to see a full-strength signal unless you are close to a very strong signal.
Does Firmware effect the AGC set up at all>???
AtlasFBG2
Member
With the 1.22 firmware the lcn finder now works on the con+ systems.
However in search mode it still skips over the con+ control channel on 2 sites both in 454mhz. If I press channel hold and manually tune to the frequencies it picks up both the control channels. Signal is 3 bars on one site and 5 bars on the other.
Is there a way to record a log in search that will help identify thus problem?
However in search mode it still skips over the con+ control channel on 2 sites both in 454mhz. If I press channel hold and manually tune to the frequencies it picks up both the control channels. Signal is 3 bars on one site and 5 bars on the other.
Is there a way to record a log in search that will help identify thus problem?
When I'm in Custom Search it shows Con+ when I go to scan the system the Con+ doesn't show up.
Ubbe
Member
It does. Along with many other things like audio levels, decode thresholds, signal strenght bars and more.
What it can't change are things like the sensitivity of the receiver and the front-end filtering characteristics.
Did you notice any changes in how the audio AGC reacts?
/Ubbe
Haley
Member
- Joined
- May 28, 2005
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- 1,132
Not quite sure if this is what everyone is talking about. But when I updated to the new Sentinel version, I had to re-set many of my settings (some were my fault, but a few were not). I also updated to 1.22.00. Is it possible, like me, that some of the poster's did both update's , and maybe Sentinel changed some of them?
AtlasFBG2
Member
Here is a youtube video of what it happing. I tried in both 12.5 and 6.25 steps with same result.
https://www.youtube.com/watch?v=5ZYQZEOieZo
Turn of your pager screen.
AtlasFBG2
Member
How do I do that?
Menu
Srch/Clocall opt
Broadcast screen
Set each band
Pager off
Sent from my Pixel 2 XL using Tapatalk
Srch/Clocall opt
Broadcast screen
Set each band
Pager off
Sent from my Pixel 2 XL using Tapatalk
Menu-Srch/CloCall Opt-Broadcast Screen-Set Each Band-Pager=Off
Sent from my iPhone using Tapatalk Pro
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