NSWGRN is now Phase 2, and has 467MHz bandplan added
NSWGRN is now Phase 2, and has 467MHz bandplan added
Hi Guys,
A user on here noticed that the bandplans on his local GRN site have changed. A quick check of Horsely Park GRN site reveals the same changes have been made on this site too.
Of note is the 467.5125MHz (with a -10MHz offset) bandplan being added in as well.
A user on here noticed that the bandplans on his local GRN site have changed. A quick check of Horsely Park GRN site reveals the same changes have been made on this site too.
Of note is the 467.5125MHz (with a -10MHz offset) bandplan being added in as well.
Re: NSWGRN is Phase 2, and has 467MHz bandplan added!
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- DF2FAE47-590D-4557-A9E9-31FDE27716EE.jpeg
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VK2MRC
Re: NSWGRN is now Phase 2, and has 467MHz bandplan added!
Yeah, great find Longreach. This probably means that even more changes are on the way now too.
PS - I fixed up the photo links in your post.
PS - I fixed up the photo links in your post.
- Bigfella237
- Posts: 1897
- Joined: Fri Feb 26, 2010 3:11 pm
- Location: In geosynchronous orbit above the Far South Coast of NSW, Australia
Re: NSWGRN is Phase 2, and has 467MHz bandplan added!
I can't see your image for some reason but how can you tell what the offset is from UT?citabria wrote: ~ Of note is the 467.5125MHz (with a -10MHz offset) bandplan being added in as well.
The bandplans have been like that for a while (see the "Notes" section of the site list).
Andrew
Re: NSWGRN is Phase 2, and has 467MHz bandplan added!
I'm not using Unitrunker in this particular instance - Pro96com calculates and displays the offset for me.Bigfella237 wrote:I can't see your image for some reason but how can you tell what the offset is from UT?citabria wrote: ~ Of note is the 467.5125MHz (with a -10MHz offset) bandplan being added in as well.
Ah yes - first time I have noticed it. If you can manage to see the attachment in my first post it shows all the ranges as reported by Pro96com.Bigfella237 wrote: The bandplans have been like that for a while (see the "Notes" section of the site list).
Andrew
Re: NSWGRN is now Phase 2, and has 467MHz bandplan added
Andrew, try clicking on the attachment in the first post - hopefully that works for you.
Another thing that has been noticed (by cartman) is that bandplan 5 never actually gets used either. All the 420MHz channels are accessed by extending the 04 - 412.475MHz bandplan up into that frequency range.
I have confirmed this on multiple sites as well. Even the channel grants that come up are in the 04 bandplan as well.
Another thing that has been noticed (by cartman) is that bandplan 5 never actually gets used either. All the 420MHz channels are accessed by extending the 04 - 412.475MHz bandplan up into that frequency range.
I have confirmed this on multiple sites as well. Even the channel grants that come up are in the 04 bandplan as well.
- Bigfella237
- Posts: 1897
- Joined: Fri Feb 26, 2010 3:11 pm
- Location: In geosynchronous orbit above the Far South Coast of NSW, Australia
Re: NSWGRN is now Phase 2, and has 467MHz bandplan added
Thanks, I should've tried clicking the attachment to begin with, I see the image now. I recall Unitrunker used to display the offset too but that feature disappeared quite some time ago.
The problem is, all freqs above 420MHz are licenced on the ACMA with +5.2MHz offsets as per the Government Spectrum assignments.
That means, every radio responding to a bandplan 04 LCN allocation above 04-1205 is TRANSMITTING ON UNLICENCED FREQUENCIES!
For example, site 001-071 at Parramatta has a CC of 422.2875MHz, if you go to the ACMA page, and then into the assignment details for that frequency, it clearly states that the paired (Base RX) frequency is 427.4875MHz, an offset of +5.2MHz as the spectrum says it should be.
*IF* the CC data stream is actually mislabeling this frequency as LCN 04-1570 (instead of 05-0366) then the radio must be calculating the offset based on bandplan 04, and must be transmitting it's response on 412.8375 instead of 427.4875
412.8375MHz is NOT LICENCED at that ACMA site, therefore the NSW TELCO is forcing user radios to transmit on unlicenced frequencies!
This would be a major screw up, it also means the wrong receive freqs would have to have been programmed into the repeaters themselves, and the combiners/diplexers tuned to the wrong frequencies? I just can't see them making such a huge mistake?
Or if the hardware was setup correctly and just the LCNs entered wrongly, then the site would never see any use as it would never hear affiliation requests?
Andrew
If those higher LCNs are being transmitted incorrectly then the TELCO has a BIG problem! If a radio is told to use an LCN in bandplan 04 it WILL offset the Base TX frequency by -9.45MHz and transmit back to the site.citabria wrote: ~ Another thing that has been noticed (by cartman) is that bandplan 5 never actually gets used either. All the 420MHz channels are accessed by extending the 04 - 412.475MHz bandplan up into that frequency range. ~
The problem is, all freqs above 420MHz are licenced on the ACMA with +5.2MHz offsets as per the Government Spectrum assignments.
That means, every radio responding to a bandplan 04 LCN allocation above 04-1205 is TRANSMITTING ON UNLICENCED FREQUENCIES!
For example, site 001-071 at Parramatta has a CC of 422.2875MHz, if you go to the ACMA page, and then into the assignment details for that frequency, it clearly states that the paired (Base RX) frequency is 427.4875MHz, an offset of +5.2MHz as the spectrum says it should be.
*IF* the CC data stream is actually mislabeling this frequency as LCN 04-1570 (instead of 05-0366) then the radio must be calculating the offset based on bandplan 04, and must be transmitting it's response on 412.8375 instead of 427.4875
412.8375MHz is NOT LICENCED at that ACMA site, therefore the NSW TELCO is forcing user radios to transmit on unlicenced frequencies!
This would be a major screw up, it also means the wrong receive freqs would have to have been programmed into the repeaters themselves, and the combiners/diplexers tuned to the wrong frequencies? I just can't see them making such a huge mistake?
Or if the hardware was setup correctly and just the LCNs entered wrongly, then the site would never see any use as it would never hear affiliation requests?
Andrew
Re: NSWGRN is now Phase 2, and has 467MHz bandplan added
I had the exact same thoughts, but the sites do appear to be working ok - there's no way they tuned up the receivers at the GRN sites for the wrong channels. I guarantee that there's some intricacy we have missed. I'm not sure where, but I'm pretty sure a problem that big would get noticed - the GTR8000s and Quantars are configured on a per channel basis, so they would have to deliberately mis tune those too.
I think I'll park my SDR on the inputs for some of these sites and see what comes up.
Anyway, here's some screenshots from Pro96com. I have asked others to chime in with their info as well.
Looking at the channel grant log entry is particularly interesting - I whipped up an Excel spreadsheet that confirms that 04-1898 lines up with the frequency in question (424.3375MHz)
I think I'll park my SDR on the inputs for some of these sites and see what comes up.
Anyway, here's some screenshots from Pro96com. I have asked others to chime in with their info as well.
Looking at the channel grant log entry is particularly interesting - I whipped up an Excel spreadsheet that confirms that 04-1898 lines up with the frequency in question (424.3375MHz)
Re: NSWGRN is now Phase 2, and has 467MHz bandplan added
So, naturally the bandplans are incorrect, and of course there is another kludge that has been put in place to work around it.
Check out the channel grant opcodes from the sites control channel, and you can see that it's explicitly giving the input frequency as an extension of bandplan 4 as well.
The radios are getting the correct input/uplink freq form the SU to the base using the explicit grants.
Check out the channel grant opcodes from the sites control channel, and you can see that it's explicitly giving the input frequency as an extension of bandplan 4 as well.
The radios are getting the correct input/uplink freq form the SU to the base using the explicit grants.