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Last Updated August 15, 2012

 

 

Telephone Pioneers Amateur Radio Club


BC Digital Emergency Services Network

Welcome to the Telephone Pioneers Amateur Radio Club!

TPARC operates and maintains a HF/VHF/UHF ROSE switched packet amateur radio network in British Columbia that extends from the capital city of Victoria, through the Lower Mainland, up into the interior to Kamloops, and over to the North Okanagan at Vernon.

In the Lower Mainland, TPARC also operates a VHF and UHF linked voice repeater system on 145.170MHz (-600kHz) and 442.875MHz (+5MHz).

Please see the links at the left for more information.

TPARC is a registered Canadian charity. We accept all monetary donations, as well as in-kind donations of suitable hardware. Tax receipts will be issued, where applicable. Contact the TPARC President (see About Us for contact information) if you wish to make a donation.



Network Outage Alert

2015/08/19

***FREQUENCY CHANGE FOR MT. SICKER, VE7TPS-8***

The frequency change indicated below has been completed. Please access VE7TPS-8 in Duncan on 145.610MHz. Please note that there is NO OFFSET. Double check your radio, as some may automatically apply a -600kHz repeater offset.

***VE7TPO-8 Outage***

The Vernon node, VE7TPO-8, has been off the air for a while. We are aware of the issue, and are trying to schedule a maintenance trip to site. It appears that the trunk radio facing Greenstone has failed. We will work to resolve this issue as soon as possible.

2015/05/22

***FREQUENCY CHANGE FOR MT. SICKER, VE7TPS-8***

You may or may not know that the existing frequency used by the VHF drop at Mt. Sicker is the uplink frequency used by the ISS (our network existed before ISS was built).

As such, it has been decided to change the drop frequency at Mt. Sicker to move off this channel.

The new frequency that will be used is 145.610MHz (simplex as before). This frequency has been co-ordinated with the other users at Mt. Sicker and poses no intermod risks to anyone.

The frequency change is expected to take place some time next week (week of May 25). If you suddenly stop hearing VE7TPS-8, try its new frequency.

2015/05/16

Looks like the Vernon node, VE7TPO-8, has fallen off the network. It is still responding on the drop side, but the UHF link between Vernon and Kamloops is in trouble. Looks like a radio or TNC issue. May have to wait until the snow melts at Silverstar to be able to check it out.

1200 Baud Data Repeaters

As many long time TPARC network users will know, we pioneered the 1200 baud "bit regenerating repeater" back in the early 90's.

Over time, the modems used to provide this function have grown old and many have passed their bits on to the bit bucket.

As we go through and refresh the network, these dead regenerators will be replaced by transparent repeaters.

What is the difference, you ask?

The bit regenerator takes the packets from the receiver on the repeater, runs them through a modem (full duplex) to re-clock the bits, and sends the "cleaned up" packet to the transmitter. The advantage of doing this is that no matter what the repeater receives (ie deviation too high or too low from a user), as long as the modem can decode the packets, it will spit them back out at a known deviation to everyone else listening on the channel. The problem is that you need a true full duplex Bell 202 modem to implement this since it has to decode and encode at the same time so you can pass data "through" it.

The transparent repeater that is going in as a replacement is basically like a voice repeater, whatever it hears, it repeats. There is some logic that is thrown in there so that it will only repeat 1200 baud packet, though. While this is not an elegant solution, it is still effective in fighting the overall problem of the "hidden transmitter" that these repeaters were implemented for in the first place.

In our case, things are a little more complex, as we also want to have a node hanging off the repeater, using the receiver and transmitter.

This complicates some of the logic and requires some fancy audio path switching too so that everything can co-exist.

Once this first push of refreshing the network gets completed, and everything gets working with FPAC, we will re-visit the regeneration issue and develop a suitable replacement using currently available technology.

As far as using the transparent repeater, it is pretty straight forward. Anything you send to it (remember to use a split just like you would for a voice repeater) will be repeated on its output (1200 baud packets only). If you want to connect to the node at the repeater site, you would just call the callsign of the FPAC node (see the revised instructions for using the network to be posted soon).

Thank you for visiting!


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