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  #81 (permalink)  
Old 02-21-2014, 3:13 PM
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Quote:
Originally Posted by UPMan View Post
FM or NFM on the live feed.
FM right now.
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  #82 (permalink)  
Old 02-21-2014, 3:59 PM
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Indiana Project Hoosier SafeT
St. Joseph Simulcast
Condition before: Fair
Condition after: Fair


Still seems to pull systems well where it did before at home, but after NFM to FM it misses TXs. During travel through the middle of the site it is pretty much the same as before with high error rates and dropped txs but signal is strong. Still appreciate the idea though.
  #83 (permalink)  
Old 02-21-2014, 5:46 PM
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Originally Posted by UPMan View Post
We've been investigating the various reports of degraded P25 performance in some areas and noted with interest when reports surfaced that changing from NFM to FM mode improved P25 decode performance.[/B]
I think I'm going to go against the grain here. I have had my feed (Frederick County Airport, Highway, Police, Fire and EMS) set to FM for a few hours today. And also set to NFM for a few hours. I'm 99.5% sure that decoding is better (for me) in NFM mode.

Let me tell you a bit about my situation. My scanner sits dead center of two close towers. One 3 miles in that direction and the other just under 3 miles in the exact opposite direction. The 536HP is definitely decoding P25 far better than my 996XT. But still is not perfect. I switched the FM today based on this thread and I believe it actually worsened. Its back to NFM now and it sounds better. If I had to rate the two modes 1 through 10. 1 being bad and 10 being perfect audio....

FM = 4
NFM = 6

I'll try this test again tomorrow. Sorry if this input is the opposite of what you wanted to hear.
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  #84 (permalink)  
Old 02-22-2014, 10:39 AM
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This is for a Motorola Type II system.

Well I took some advice and followed the directions on setting the modulation to FM. Then setting the P25 Threshold Mode to MANUAL. Then setting the P25 Threshold Level to 10.

Once I made all of these manual changes I am getting GREAT results. I use to get an error rate of about 70 to 80 and now I get errors rates between 20-30 with no choppy transmissions at all.

Sounds Pretty Good. Some good old fashion manual settings makes the radio sound good.
  #85 (permalink)  
Old 02-22-2014, 10:48 AM
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Quote:
Originally Posted by davenlr View Post
My 800 P25 system sounded OK, except the tone outs for fire dispatches were garbled. Switched it to FM, and the tone outs were still garbled, but the voice audio is now a little distorted sounding. Switching it back to NFM.
Update for format:
System: Arkansas Wireless Information Network (AWIN) Trunking System, Statewide, Multi-State - Scanner Frequencies
Site: Little Rock Metro Simulcast Site Details (Arkansas Wireless Information Network (AWIN))

Before: Excellent
After: Good
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  #86 (permalink)  
Old 02-22-2014, 11:56 AM
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http://www.radioreference.com/apps/db/?sid=3918

Hopewell Site – 3 bars Signal Strength Solid

Condition before: Excellent
Condition after: Excellent
  #87 (permalink)  
Old 02-22-2014, 1:11 PM
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Ohio MARCS-IP: Multi-Agency Radio Communications (P25)
Ohio MARCS-IP: Multi-Agency Radio Communications (P25) Trunking System, Various, Ohio - Scanner Frequencies
001 Cuyahoga simulcast
Before: Poor-Good
After: Good-Excellent

Ohio MARCS-IP: Multi-Agency Radio Communications (P25)
Ohio MARCS-IP: Multi-Agency Radio Communications (P25) Trunking System, Various, Ohio - Scanner Frequencies
007 Elyria
Before: Good
After: Excellent

Greater Cleveland Radio Communications Network
Greater Cleveland Radio Communications Network Trunking System, Cleveland, Ohio - Scanner Frequencies
001 Cleveland Simulcast
Before: Poor-Good
After: Good-Excellent
  #88 (permalink)  
Old 02-22-2014, 7:21 PM
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Michigan's Public Safety Communications System (MPSCS) Trunking System, Statewide, Multi-State - Scanner Frequencies MPSCS Michigan
Sites: Northville, Munith and Howell
Condition before: Excellent
Condition after: Excellent
However all of my muffled talk groups when set on NFM are now acceptable to very good on FM. So it has cleared up the Audio quality for this system.
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  #89 (permalink)  
Old 02-22-2014, 7:26 PM
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Default Test for P:25 Decode Improvement

Virginia Statewide Agencies Radio System (STARS) Trunking System, Statewide, Virginia - Scanner Frequencies
Condition Before: Poor
Condition After: Excellent
  #90 (permalink)  
Old 02-22-2014, 9:12 PM
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Tennessee Valley Regional Communications System, Phase 1 & Phase 2, Chattanooga Simulcast site. (This system is linked into TACN)
Tennessee Advanced Communications Network (TACN) Trunking System, Varies, Multi-State - Scanner Frequencies

Switching from NFM to FM made decode worse.
Decode optimal when NFM, 12.5kHz.
Noted noise from nearby cell towers choked desired signals when FM 25 kHz, but in NFM 12.5 kHz i get little, if any cell tower interference.
BG..
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  #91 (permalink)  
Old 02-22-2014, 9:29 PM
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FORMAT FOR REPORTING (to make my life a little easier):
Link to the system in RRDB.
Specific site monitored (if known).
Condition before: Excellent / Poor
Condition after: Excellent / Poor


https://www.radioreference.com/apps/db/?sid=7128
Simulcast (unknown)
Condition before: Good, some degradation at times, mostly evenings
Condition after: Worse, DAT kept going off/on. Switched back.OK

Mike DeMeo
W2MDN
  #92 (permalink)  
Old 02-23-2014, 6:05 AM
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Default BCD536HP/BCD436HP Test for P25 Decode Improvement

Michigan's Public Safety Communications System (MPSCS) Trunking System, Statewide, Multi-State - Scanner Frequencies
Site: Holly Tower
Condition before: Good
Condition after: Excellent
Watching the error rate on NFM it goes between 0-11when set to FM it goes between 0-2 and the Audio sound better set to FM.

Mike
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Last edited by kb8rvp; 02-23-2014 at 6:15 AM.. Reason: Fixed link
  #93 (permalink)  
Old 02-23-2014, 2:46 PM
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San Diego County - Imperial County Regional Communications System (RCS
South Simulcast


Before: Poor
After: Poor
  #94 (permalink)  
Old 02-23-2014, 3:59 PM
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Default Test for P25 Decode Improvement

SITE MONITORED FROM HOME: Greater Cleveland Radio Communications Network

CONDITION BEFORE WITH NFM: Poor to good

CONDITION WITH CHANGE TO FM: Much worse in performance


I have simulcast issues from from my home. My new BCD536HP copies the network above poor to good, whereas neither my PSR-800 or my PRO-197 will copy the system at all.
  #95 (permalink)  
Old 02-23-2014, 4:37 PM
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San Diego County - Imperial County Regional Communications System (RCS) Trunking System
Site: North Cell
Condition Before: Good
Condition After: Very good
  #96 (permalink)  
Old 02-23-2014, 6:26 PM
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BALTIMORE COUNTY MD - PHASE 1 SIMULCAST
Baltimore County Trunking System, Various, Maryland - Scanner Frequencies

Site: South (the primary site for the county)
Before: VERY GOOD
After: FAIR


Discussion: Test conducted in a high RF environment ( cellular/NEXTEL density, nearby jurisdictions on 800mhz that are well copied from here) - so I'm actually not surprised that FM mode diminished performance - -likely a result, in part, of significant adjacent channel interference that developed while "grabbing" a wider piece of spectrum.
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  #97 (permalink)  
Old 02-24-2014, 2:10 AM
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Indiana SAFE-T... St. Joseph County, Elkhart, Wanatah, Plymouth... Before: poor... After: excellent. I never saw so much zero error across the board. Sounds perfect too.
  #98 (permalink)  
Old 02-24-2014, 8:06 AM
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Update report
Orange County (California) CCCS
N, NW, S, SW, Countwide Sites P25 decoding
NFM Poor
FM with P25 manual 10 Quite good

Steve AA6IO
  #99 (permalink)  
Old 02-24-2014, 1:18 PM
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Here are a few from the Los Angeles basin:


Los Angeles City (STRS - Simulcast Trunked Radio System) Project 25 Trunking System, Los Angeles, California - Scanner Frequencies
Site 8
Before: Poor/Moderate
After: Moderate

Site 1:
Before:Moderate
After: Good
Audio appears to sounds louder with FM

Los Angeles World Airports (LAWA) Trunking System, Los Angeles, California - Scanner Frequencies
Site 1:
Before: Excellent
After: Excellent

Interagency Communications Interoperability System (ICIS): Project 25 Trunking System, Los Angeles County, California - Scanner Frequencies
Site: 16
Before: Moderate
After: Moderate


In summary, I did not notice any huge changes, though going to FM from NFM certainly did not degrade the performance.
  #100 (permalink)  
Old 02-24-2014, 4:27 PM
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Quote:
Originally Posted by dubs0980 View Post
Indiana Project Hoosier SafeT
St. Joseph Simulcast
Condition before: Fair
Condition after: Fair


Still seems to pull systems well where it did before at home, but after NFM to FM it misses TXs. During travel through the middle of the site it is pretty much the same as before with high error rates and dropped txs but signal is strong. Still appreciate the idea though.
Sorry guys couldnt find where to edit this post. I actually went into favorite group settings and changed the site to FM and now it shows FM when it hits on talkgroups (so following UPmans route through the settings may not have been changing mine because I'm monitoring my simulcast site as a favorite and not by the "full database") But it still doesnt make a big difference...alone

However changing the p25 system to manual and threshold to 10 combined with FM dare I say its 90% as good as my 396xt which is pretty darn good when this audio sounds better IMHO. It is still showing error rates in the 30's and 40's but if I didnt see the rates I would guess under 15 just by listening to it. I'm still not sure if its missing tx's but I'll listen some more.
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