When I was in the area yesterday, I noticed that the site number associated with the Feedstone Mtn site is incorrect in the RRDB. The RRDB shows the Feedstone site as 000-000, but over the air, no site 000-000 exists. There is a site 001-001 using a control channel of 00-0084, which works out to be 852.050 - which is a freq associated with the Feedstone site according to both the RRDB and the FCC license WQEK814. I will submit an update.
Rockingham / Harrisonburg P25
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Yep, you are correct. I haven't looked at the system in the RRDB for a while. I don't know if it was changed or it was never correct in the first place. But I do know on my Unication G5, it'll switch to a site number of 1 (or 01, maybe) when I am in that area.
kc4jgc
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Todd,
Is this system FDMA with NO encryption on the LE TG's? Reason why I'm asking is even though the system as described as TDMA, everything is listed as "D", or FDMA. Just wondering if it's worth programming into my Pro-106.
Is this system FDMA with NO encryption on the LE TG's? Reason why I'm asking is even though the system as described as TDMA, everything is listed as "D", or FDMA. Just wondering if it's worth programming into my Pro-106.
My experience with my Pro-197 (which I think would be what you would expect with the 106) is that it will receive talk groups intermittently. I think the default mode of the system is TDMA, but fairly often you will receive traffic on the 197. The audio received is pretty poor, however. Also, law enforcement is in the clear for the most part. I am not sure if main channels have ability for encryption, but I do know there are some investigations, swat, etc. channels that are encrypted. I am not sure how often these are used.
The 536 and 436 scanners receive this system, but lately the quality of the audio has seemed iffy. I haven’t used the 352p2, however the 996p2 will completely miss a lot of transmissions. I suspect this is definitely from simulcast issues. And I know a guy with an sds-100 that says it does very well, as does the unication G5.
The 536 and 436 scanners receive this system, but lately the quality of the audio has seemed iffy. I haven’t used the 352p2, however the 996p2 will completely miss a lot of transmissions. I suspect this is definitely from simulcast issues. And I know a guy with an sds-100 that says it does very well, as does the unication G5.
When I was in Harrisonburg on Friday, the city police (Tac 1) were TDMA unencrypted, and the county sheriff (patrol 1) were unencrypted FDMA. Harrisonburg Fire and Rockingham Fire dispatch channels were TDMA unencrypted. Reception was good using a SDS200.
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Yup. The Rockingham Sheriff units on duty when I passed through were almost all FDMA; but RID 4439820 seemed to use both FDMA and TDMA; not sure why that was. Maybe a certain tower site is not configured for TDMA? The channel operated in both FDMA and TDMA modes.
kc4jgc
Member
Hmm.... Interesting....
FDMA-only radios will knock the system back to FDMA when they affiliate to any given talkgroup.
Yes, but a single RID was logged using both FDMA and TDMA modes, which leads me to believe there is a site that is using only FDMA base stations or a channel that is only FDMA. I don't have any documentation or insight about the system design to know all the site details. The statewide Moto system in Maryland does not license all channels for dual mode. Not sure if L3Harris has a similar scheme. Or it could also be an error in UT2 logging.
If a *different* radio (that was FDMA only) affiliated with that talk group, then it would knock all the radios back to FDMA. So it's likely you would see the same RIDs using both modes ... except for any FDMA-only radios!
Good point. I wonder how long it takes the subscriber to default back to TDMA - The other 3 or 4 radios on that tg were all FDMA. Not sure if they were all registered at the same time. Or maybe it tries to join in TDMA mode, then gets instructed fall back to FDMA?
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