Up to date news about the nodes at GB3OA

The New Years Eve welcome to 2018 will take place as usual on node 9200, the Crossroads reflector in the US where countries log in as they go through the New Year. GB3OA will be connected to this reflector when the countries who usually participate connect. These are:

  • New Zealand – 11.00UTC
  • Australia – 13.00UTC
  • Malaysia – 16.00UTC
  • South Africa – 22.00UTC
  • UK – 00.00UTC

OA will be connected at five minutes to the hour for twenty minutes.

Users of GB3OA are welcome to connect OA to node 9200 at other times themselves, and especially for the US at 5, 6, 7 and 08.00UTC the following morning. As the connection will be via IRLP there is no need to put a # or * before the node number.

Other news.

A full backup of the nodes server software takes place during the afternoon of the first Thursday of every month. The nodes are taken down at this point, but this lasts only for about twenty minutes.

Most evenings of the week OA is connected to the Alaska Morning Net just after 6pm (9am their time). This net is not just for Alaskans! Anyone worldwide is welcome to check in when the Net Controller requests more check ins, and that includes locals direct into GB3OA. There is a different Net Controller each day and they run the Net as they prefer i.e. some ask how your day has been, some have a topic (e.g. what do you think of Chinese HTs), some have a trivia question related to radio, etc. Some of the check ins specialise and are very knowledgeable about a particular subject. The Net doesn’t run on a Sunday, but on other days, if OA is not connected to the AMN then please feel free to connect using DTMF tones 9109 between 6pm and 8pm. Please send DTMF 73 when finished.

Note that the Echolink Android app is now not available on Google Play Store until February when a new version will be released. However, the old version is available free from Amazon or the Echolink web site.

Finally, the Repeater Keepers wish all who use GB3OA Southport a Healthy and Prosperous 2018!

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A change to the use of Echolink

There’s been a small change to a custom decode Echolink script at GB3OA repeater that should help local Echolink users.

The original IRLP/Echolink server required outgoing echolink request connections to be prefaced by the hash (#) symbol. With the new server software this changed to the star (*). This confused users but its change was detailed on both the GB3OA news page and the internet-linking page.

Looking at the logs many outbound echolink requests are still trying to use the hash symbol before eventually finding that the star symbol works instead. So to stop this confusion an addition to the DTMF custom decode script has now been added allowing either the hash or star symbol to work.

For example, to now connect GB3OA to GB3CA (Carlisle) both #412685 and *412685 will work.

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Connecting Echolink to IRLP on GB3OA not possible

This was not mentioned on the Internet Linking page on the GB3OA website and so one user was trying to do this. The following has now been added to the Internet Linking page….

Can I come into GB3OA using Echolink and send DTMF tones over Echolink to make GB3OA connect to an IRLP node or reflector?

The full answer is No.

Firstly, the nodes server filters out any DTMF tones on Echolink. Secondly it’s not possible to link Echolink to IRLP. The Echolink and IRLP bods have agreed this as the two are quite different, and it could lead to technical problems at the reflector or node. Thirdly, it’s possible to have several Echolink connections at OA at once, but only one IRLP connection, and if IRLP is being used then no Echolink connections are possible. This is the situation with all IRLP and Echolink repeaters.

Note also that on this page the link URL on the first link at the bottom of the page is now correct. This allows a user to see all IRLP nodes.

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Technical details – SAS streaming

A couple of local operators have asked for technical details on relaying pilots talkback during the Southport Air Show through shoutcast.com

The normal rig that receives GB3OA transmissions is a Baofeng UV-3R. Its audio output is pumped through a sound card attached to a Raspberry Pi v.2. This uses the audio level controller Alsamixer program and then DarkIce to convert the analogue audio to digital and send it to shoutcast.com.

However, the UV-3R does not have AM nor airband to be able to receive the pilots transmissions. So a Kenwood TH-F7 HT will be used instead of the Baofeng. This rig has wide-band receive from 100kHz to 1.3GHz, and can receive CW, SSB, AM and wide and narrow FM. It can only transmit on 2m and 70cms, using wide or narrow FM.

A test with this rig was carried out earlier in the week tuned to Manchester Airport Area Control Centre on 128.050MHz and streamed to shoutcast.com. All worked well. The main frequency that will be used for the Southport Air Show will be 121.175MHz although other frequencies will be monitored and the TH-F7 retuned should another frequency be more interesting.

Note that once the TH-F7 is set up during this afternoon it will be left as is until the Air Show completes on Sunday at around 17.00BST. Therefore there will be no relaying of GB3OA during that period.

Also, the introductory announcement on the stream to shoutcast.com will change, to explain the new relay for those listening in worldwide.

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