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APRS on UHF
APRS can be found on 439.100MHz in the greater Melbourne area.
The aim of UHF APRS is to provide an APRS RF channel for Home stations with additional services that are not suitable for the VHF channel due to band wide limitations. This will leave the VHF channel available for Mobile & Country station.
On UHF APRS you will find additional services that are not available on VHF. You also have the advantage of being able to ........
The recommended Packet Path for UHF is RELAY,WIDE for mobile stations and WIDE for fixed / home station.
Please contact Richard VK3JFK before setting up a WIDE digipeater.
IN Victoria, the UHF Frequency is 439.100Mhz running at 1200bd. This is largely an experimental system that, unlike it VHF cousin, runs lots of APRS data. The VHF network extends State wide and caters for Home and mobile stations. The UHF network is Melbourne Suburban Centric and is mainly designed for home and portable stations.
The UHF network is based around Melbourne City and is mainly for home and portable stations. Why the difference? Well mobile stations usually put out beacons every 2 minutes or so. This drives up the amount of packet traffic on the vhf channel. If you put out a lot of Net traffic on the channel as well, it would start to get congested, and the mobile stations would find it hard to get a beacon in. In addition to this, VHF travels better for mobile use that UHF, (hence why most country repeaters are VHF not UHF). If you look on the VHF channel you will see VK3 + 1000KM radius +HF VK
This is the channel you should use to get the best results mobile.
On UHF you will get all of Australia, New Zealand and surrounding areas, including many objects ( Earth quakes, Cyclones, DX spots, satellites) in the our area of the globe. In addition, there is DX cluster information from VK and ZL stations on the same frequency. This can be easily monitored if you have a Kenwood D7 or a 700D. The idea is that you get as good as service, as if you could connect to the Australian APRS server via the internet, but with the advantage of no internet cost to you, and full service while remote.
This is the channel you should use to get the greatest amount of APRS data at home or remote. You can use it mobile, but the channel is very busy so you might not get all your packets tracked.
At the moment there is one Digi/Igate (VK3TBN-10) in Greensborough North of Melbourne and one Digi (VK3MY-2) in the Boronia area East of Melbourne. It is planed that VK3CV-1 on Mt Macedon will have a UHF Digi in the next year or so, therefore completing coverage to most if not all of the Melbourne Suburban areas. Look on this web site to get an idea of location and coverage for your area http://220.127.116.11:3105/find.cgi?call=VK3TBN-10 and http://18.104.22.168:3105/find.cgi?call=VK3MY-2
VK3TBN-10 is the IGATE for UHF. The IGATE software (UI View 23) obtains APRS information from the Internet and gates it to RF with the use of software. It logs into the same APRS servers that you would on the internet. The IGATE filters on VK3TBN-10 have been opened to allow as much traffic through as possible, so that receive station will have a feature rich experience.
VK3TBN-10 also uses a DX Cluster Bridge to able it to log on to a DX cluster on the internet and “bridge” DX reports to the RF channel. The filters on the DX Bridge have been set for “By Vk and By ZL”. This can be changed by request, just drop me an email at VK3TBN@hotmail.com . The DX cluster information stream is only available on UHF.
Both the Igate (UI View 32) and the DX cluster then software stream their data into another piece of software called AWG Packet engine and then into a TNC and Radio that they share.
VK3TBN-10 has many other features as well for APRS users that you can utilise on both VHF and UHF.
Is a traffic probe that counts the amount of APRS traffic that my station hears in a 10 Min interval. It logs this and produces traffic reports so that I can gauge usage and content.