I do greatly appreciate the response and assistance. It goes toward having a great feed, and its a pleasure to provide it.
Lakewood PS P25
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MikeyB
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I have looked through this thread and haven't seen a whole lot yet on the different sites. Is there anything that can be gained by listening to Green Mountain or is it like the EDACS where one site had it all and the other only filled in gaps for coverage and didn't carry all TG?
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So far I have not seen a difference between the two sites. I run two radios side by side, one on each site and logging from both and they appear to be identical.
Both sites have 8 chs, an indication of equal traffic loading between the two sites.
Green Mtn fills in the shadow northeast of it. One RF hole is down in the dip around Mississippi and Garrison. I presume it also has some better building penetration in some areas, but I haven't payed alot of attention to handheld affiliations.
I still have not heard the Mt. Morrison analog fireground repeater. Perhaps the plan has changed. Has anyone heard it or heard if it is going to be implemented?
Both sites have 8 chs, an indication of equal traffic loading between the two sites.
Green Mtn fills in the shadow northeast of it. One RF hole is down in the dip around Mississippi and Garrison. I presume it also has some better building penetration in some areas, but I haven't payed alot of attention to handheld affiliations.
I still have not heard the Mt. Morrison analog fireground repeater. Perhaps the plan has changed. Has anyone heard it or heard if it is going to be implemented?
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WMFR Harris ADPCM Vocoder on Unidens
Does anyone else find that Unidens do not do a good job with the Harris audio? On my 996's the audio sounds real loud and distorted most of the time. When someone speaks softly it sounds OK. My GRE's hear the audio just fine all the time. I would think that the Harris ADPCM vocoder audio would sound much better than IMBE or AMBE on any radio, but that does not seem to be the case. Perhaps Uniden needs to do a firmware tweak.
I'm talking about the Lakewood/West Metro/Wheatridge system, not a Harris system somewhere else in the country.
Does anyone else find that Unidens do not do a good job with the Harris audio? On my 996's the audio sounds real loud and distorted most of the time. When someone speaks softly it sounds OK. My GRE's hear the audio just fine all the time. I would think that the Harris ADPCM vocoder audio would sound much better than IMBE or AMBE on any radio, but that does not seem to be the case. Perhaps Uniden needs to do a firmware tweak.
I'm talking about the Lakewood/West Metro/Wheatridge system, not a Harris system somewhere else in the country.
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Harris isn't using ADPCM on the P25 side - it's all IMBE or AMBE.
I think Lakewood is definately loud on my 996T, but I do notice it on my Pro-197 as well...
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Thank you for that info. The sales literature that I saw at IWCE last Spring showed ADPCM. I just presumed that's what Harris had sold them. Now that I think back about it, Lakewood had already installed at least some of the infrastructure prior to that. So now my question is are there two versions of Harris P25 or did Harris drop the ADPCM? I guess I need to dial them up on a service monitor and see what their modulation looks like.
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ADPCM is not an over-the-air modulation scheme in P25. It's generally used as a coding format to represent analog audio for digitization onto TDM transport like DS0. Are you thinking of P25 Phase I vs. P25 Phase II? Or perhaps the enhanced vocoders in their radios changing from IMBE to AMBE+?
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Kevin_N
Member
I think they sound way worse than DTR on my GRECOM.
Food for thought- I'm still not convinced the GRE-600 is the scanner for this P-25 system.
The archive of my West Metro feed for 12:08 a.m. Sat 01/28/12 has many instances of transmit with no answer, and answer without a preceding transmit. Again, I only have the West Metro P-25 system entered, nothing else, and consistently get five bars signal. It was an active scene with communication to rigs for traffic safety, calls for PIO, and some transmissions I am sure I missed. A real shame.
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I'm running a PSR-600 on it without any issues-
Okay,
Must be inconsistencies between loading, hardware, version,
Just trying to narrow it down. Any solution would be greatly appreciated. As I have repeatedly said in these pages, its great to provide the feed but if its not consistent then why bother.
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I can pause on a TG like 37786 or 37787 and hear only one side of the transmissions. I can watch the other side answer on PRO96Com. This is off of Mt. Morrison where I can look out and see the transmitter building, so I have plenty of signal. In fact I don't even need an antenna on the radio. I haven't been able to figure it out. I'll have to watch and listen some more. I'll need to listen on 3 or 4 radios and log on a 5th. It's not logical that it works for some. Maybe I can run PRO96com on one computer and the GRE logging on a 2nd computer and see what that looks like.
rdrunnermedic
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I've seen some Wheat Ridge DPW radios affiliate with 37096, but no actual audio for it yet. 37564 is consistently denied off of T101, so no audio yet. However, if the normal conventions apply I would venture a guess that 37564 is for Lakewood Code Enforcement (add 37 to the existing 564 Code Enforcement TG from the old system). This might explain the denials for that TG. I was able to copy some Pridemark EMS traffic on 37821, which leads me to believe that it might be related to Fairmount FD but nothing definitive yet.
rckydenver
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Add TG 37808 to the list. Just briefly heard them say Wadsworth command and a home depot.
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Running multiple radios side by side it looks like it is a RF issue with the control channel. The control channel on the 600 suddenly goes away. When the control channel comes back everything is back to normal. Usually it is 5-10 seconds that the ctrl ch is gone. Other radios never lose the control ch or does the CC even get noisy. It is like desense or AGC comes on so strong that it almost completely shuts down the RF. It is strange that it only shows up on the Lakewood system. The next test is to see if there's a different behavior when the CC changes from 851.0875, but it seldom rotates lately. So at this point my best guess is that a strong signal comes up close to 851.0875 which only effects the 600 so maybe its an image, but because this has happened on multiple 600's it is not a local signal unless the same kind of device is generating the signal at multiple locations. More over the air and on the bench testing is needed.
rckydenver
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West Metro Fire is testing there Harris radio again on TG 37788 which is WMetro-Tac 4. Using chain saws and etc.
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Listen to it while it's happening - pulsing noises most likely mean NEXTEL. Otherwise, I would bring up adjacent channels 12.5 kHz and 25 kHz away to see what's there and determine if there is a correlation between those adjacent channels becoming active & the signal going away. Use this site to see if there is a NEXTEL site near you:
https://nextelnetwork.sprint.com/
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