Alain
Member
Sorry. I thought you were using Sentinel.
San Diego City 700MHz System
- Thread starter JoeyC
- Start date
Assuming you have the system set to P25 standard, the San Diego 700 system is not "lockable" in many instances because of 700MHz cell phone tower interference. For instance, when parked near my TV station on 47th and the 94 freeway, or up at 805 and El Cajon Blvd, because of adjacent cell phone towers, the 700 system is incapable of being control channel locked at all on a 396 or 996 scanner.
You can observe this by seeing signal bars for 771.48125 (that is the only active control channel, you can L/O or delete the others for testing purposes) but the scanner will not recognize the control channel DATA because it is being murdered by the adjacent 700MHz cell tower radiation. This is the reason you would want an SDS scanner, or Unication.
Paul
I don’t understand. I was able to hear all channels last summer.
Location location location...
JoeyC
Senior Member
I don't have a p2 but I have a 996 and it is H O R R I B L E on the SD 700 system and nearly unusable. But if you find a sweet spot of reception, you might get lucky temporarily.
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- Nov 19, 2008
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Yes, you either need the SDS or the Unication G series radios to receive simulcasting really well. Most people I talk to have a Motorola APX radio with NAS programmed into it. Works awesome.
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This guy is local in OC and he can program NAS really great for SD City System and the Phase II TDMA RCS system
He offers radios for sale and programming of your XTS or APX radio... He programmed the SD City 700 mhz and RCS Phase II TDMA system with South - Hendricks Peak - and ICSO office sites so I can monitor El Cajon PD and Fire Stuff as well as everything in EL Centro area. A++++++
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He offers radios for sale and programming of your XTS or APX radio... He programmed the SD City 700 mhz and RCS Phase II TDMA system with South - Hendricks Peak - and ICSO office sites so I can monitor El Cajon PD and Fire Stuff as well as everything in EL Centro area. A++++++
A 996 or 396 can perform acceptably, but only in very specific locations where the conditions are optimal. On the Whistler side of things, my WS1098s receive SD City and RCS PERFECT, but to receive both systems perfectly at my location, I need to use a LOW BAND 49" antenna positioned EXACTLY, even moving it a few inches from where it finds happiness results in half the frequencies on SD City becoming garbled, or losing CC lock on the RCS. I am located visual line of site to the towers on Cowles Mountain, so this is a simulcast issue and not a cell tower interference problem. It just goes to show LOCATION LOCATION LOCATION for interference is more general, and LSM simulcast distortion can be much more specific to within feet or inches.
My TRX scanners can't deal with LSM systems no matter what I do.
Paul
My TRX scanners can't deal with LSM systems no matter what I do.
Paul
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The Unication G5 or a Motorola does the trick for LSM. The G5 does not get talked about too much and its a GEM in my tool shed. Works everytime and never had any complaints in receiving at all.
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- Jan 4, 2003
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- 141
Is the 700mhz system off the air for anyone else? Been about 30 minutes now, I'm searching all listed channels on RR for a control channel and getting nothing. I am hearing some traffic on the 800 system.
--edit, looks like it is back up on 771.48125.
--edit, looks like it is back up on 771.48125.
Last edited:
Looks like at 12:05 the system switched to an alternate control channel, then at 12:06 it switched back to the primary.
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OP25 has handled it OK, but trunk-recorder will not lock back on to the control channel after the change... I've tried multiple radios, not sure what they might have changed but it has thrown me a curve ball.
I am running trunk-recorder for the 2 of my 3 feeds. I have had issues with following the control channel. I found that I needed the control channels to be on the same SDR. I am running my system with 2 SDR's because the frequencies needing to be covered is larger than just one SDR can handle.
Recently the SD700 system was most likely having issues and was using 2 of the alternate control channels until recently it has been pretty consistent on the primary again.
Recently the SD700 system was most likely having issues and was using 2 of the alternate control channels until recently it has been pretty consistent on the primary again.
Here's a double post from my 2024 northzone fleetmap change thread that will be new to the San Diego 700 system.
Not in database - UNKNOWN TGID
SND8DIR2
Not in database - UNKNOWN TGID
SND8DIR2
Can anyone confirm that 7N/8N/9N are still used? In the 2024 north zone fleetmap they are not included. Perhaps its just not included for mutual aid?
Additionally there is a 8P EMG and 9P EMG in the fleetmap and not the database. Possibly uses the same talkgroup ID as 7P like the RCS system does for the EMG TGIDs?
Additionally there is a 8P EMG and 9P EMG in the fleetmap and not the database. Possibly uses the same talkgroup ID as 7P like the RCS system does for the EMG TGIDs?
This looks like it will replace MA10, MA20, and MA30 so possibly be one of those TGIDs.
SND8DIR is the conventional analog T/A freq at the end channel of each SDFD zone. "2" would probably be just an added one/spare for if they need it.
Also, SDPD aiming for full encryption transition completion by January 31st 2024. This includes every SDPD talkgroup as well as every single conventional frequency, no exceptions, not even for Patch.
Paul
Thats what I would think, but from my source it isn't listed as being a conventional analog but rather apart of the system, which does seem off considering how 8DIR is analog. In any case need more info on this one.
7P/8P/9P are all the same TG. ID 321.
7N/8N/9N and 7O/8O/9O are all deprecated talkgroups. All have been replaced with conventional frequencies as noted.
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