airtraffic

Author Topic: Listeners near Sydney Nova Scotia - Looking for high-level frequncy usage  (Read 3106 times)

Offline blacktop

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I'm looking to speak to someone from the Sydney area who can give me some insight into how NAV CAN uses the high level frequencies in the area. There are two at the Kilkenney Lake site (125.250 & 133.700), and two at CYQY McCurdy (132.750 & 133.300)    From my distant location near Halifax, it seems like 125.250 is the most-used frequency...but if someone more local to the transmitters could give me some usage facts, it will go a long way towards us getting a LiveATC feed site (or two) up and running.   You can PM me here and we can hook up by email/text/phone afterwards if you prefer.
thanks

*modified to show correct frequency 132.750 (not 132.700)
« Last Edit: October 19, 2023, 07:16:04 AM by blacktop »



Offline JetScan1

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There are two at the Kilkenney Lake site (125.250 & 133.700), and two at CYQY McCurdy (132.750 & 133.300) From my distant location near Halifax, it seems like 125.250 is the most-used frequency..

I'm not located there now but I have monitored Moncton from the Sydney area in the past. In this coverage area, eastern high sectors basically extending south of a line from YHZ to YQY, the Killenney Lake RCAG covered the 2 southern most sectors, while the CYQY McCurdy RCAG covered the 2 sectors to the north of those. The sector configuration varies greatly depending on the traffic flow and the location of the daily NAT tracks. 135.250 as you noted is the primary for all 4 sectors and then the others are added and split off as traffic increases, with 132.750 primary in the north. Although with the increased use of CPDLC I'm not sure how much 133.700 and 133.300 are needed anymore.

133.950 from the Halifax RCAG also covers the very southern part of this area, for traffic coming north off HF. By monitoring the controller on this frequency and noting the handoff frequencies the aircraft are using you can determine pretty quickly how they have the sectors configured.

Attached it is a chart I put together that might make it a bit clearer.






Offline blacktop

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Thanks JS...that is exactly what I needed to make things a bit clearer now. CPDLC is used quite a bit, so hearing the next frequency to switch to is nothing like pre-CPDLC days. So I'll look to try and get all 4 frequencies up and running. Not sure what the feed can/will look like at this point...but I guess something is better than nothing.

I'll try and get 133.950 up and running soon as well.

thanks
bt

Offline JetScan1

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Re: Listeners near Sydney Nova Scotia - Looking for high-level frequncy usage
« Reply #3 on: November 02, 2023, 11:03:12 AM »
Thanks JS...that is exactly what I needed to make things a bit clearer now.

I tweaked the chart a bit to correct the northern boundary of the area covered by those Sydney frequencies. Attached below.

CPDLC is used quite a bit, so hearing the next frequency to switch to is nothing like pre-CPDLC days.

A feed that monitored the VHF ACARS frequencies would be handy for that. Then the listener could just decode them themselves. I have monitored them and decoded CPDLC from Halifax a few times when I was there. Some aircraft will log onto SATCOM early and you will see them there as well.

For example here is a SATCOM CPDLC handoff sent to KLM 632, ATL-AMS, routing via ALLEX-JOOPY, when they were 54nm northwest of Halifax.

AES:484FFF GES:D0 2 .PH-AKE /YQME2YA.AT1.PH-AKE21DC46DD69367CE87527CE0BD86080BE
FANS-1/A CPDLC MESSAGE:
CPDLC UPLINK MESSAGE:
HEADER:
MSG ID: 3
TIMESTAMP: 23:04:27
MESSAGE DATA:
CONTACT [ICAOUNITNAME] [FREQUENCY]
FACILITY NAME: MONCTON
FACILITY FUNCTION: CENTER
VHF: 132.750 MHZ

So I'll look to try and get all 4 frequencies up and running. Not sure what the feed can/will look like at this point...but I guess something is better than nothing. I'll try and get 133.950 up and running soon as well.

Thanks for doing that. Looking forward to checking them out. To bad we seemed to have lost the Yarmouth feeds. Wonder if they will come back ?