Author Topic: CZYZ Toronto Center (Barrie) also has unlisted Timmins frequency  (Read 796 times)

Offline troygiorshev

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The Toronto Center (Barrie) feed lists only the "Toronto Center (Barrie Sector, East High), 134.575" frequency.
However, listening today, I discovered that it also has 121.225.  This frequency is listed in the (Currently Down) Toronto Center (Timmins) feed as "Toronto Center (North Bay High Sector), 121.225"

Proof of this can be found by listening to the Toronto Center (Barrie) Archive on 2021-08-03 from 0530Z to 0600Z.  Starting just before 31 minutes (i.e. at the very end), the controller can be heard switching EVA 031 over to his "other frequency".  (Note that EVA 031 incorrectly reads it back as 131.225 the second time).  It's clear that the frequency was actually switched, as the audio quality of EVA 031 is significantly better when he reads back the frequency the second time.

Can the listing for the "Toronto Center (Barrie)" feed be updated to include "Toronto Center (North Bay High Sector), 121.225"?
Also, is there any way for someone to check/ask how many other frequencies are included in the "Toronto Center (Barrie)" feed that are currently unlisted?  "Toronto Center (Timmins)" has a fair number of frequencies on it, and it's unfortunate that it's down as many of those frequencies would be nice to have access to.  (Maybe we have access to them through "Barrie" but we just don't know it as it isn't listed.)



Offline JetScan1

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Re: CZYZ Toronto Center (Barrie) also has unlisted Timmins frequency
« Reply #1 on: August 04, 2021, 05:12:33 PM »
Quote
However, listening today, I discovered that it also has 121.225.

It varies depending on how they have the sectors configured. In off peak times 134.575, 124.675 and 121.225 are combined with the option to have the frequencies cross-coupled as required. With pre-covid traffic volumes the 3 sectors were usually split during the daytime shift, so you are not going to hear that all the time. I suppose for accuracy they could label the feed "134.575 cross-coupled with 121.225 and 124.675 as required".

Offline troygiorshev

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Re: CZYZ Toronto Center (Barrie) also has unlisted Timmins frequency
« Reply #2 on: August 05, 2021, 01:42:26 PM »
Ah I see.  I wasn't familiar with cross-coupling until now.  I guess the frequency listing is honest then.

(I'm now somewhat curious on how this is actually done.  It's clear from the change in audio quality that the 121.225 receiver is geographically far from the cross-coupled 134.575 transmitter.  What's the physical layer of the cross coupling?  The internet?  A dedicated line?  Anyways, I digress.)

I'm sure that this sort of cross-coupling labelling difficulty happens all over the site.  I'm a small fish here and don't want to rock the boat.  I don't think any labelling change is needed, unless there's some unifying effort to list this sort of stuff all across the site in a consistent way.

I'll just keep this with my other "ATC quirks" notes.  Thanks for the info!