We are currently rewriting and expanding the FAQs. In the meantime, please look at the individual product support pages, or go to the main support page for links to the Yahoo Groups and Argent Data support email.

What type of radio can I use with an APRS tracker? Does it need a data jack?

Just about any radio that works for voice and has a microphone input will work with a tracker. Some radios provide all of the required connections through a single convenient data jack, but this is not required. Be aware that outside of the amateur bands there may be legal restrictions on the transmission of data - for example, in the US, position data may be transmitted over FRS radios, but with some significant limitations. Check with your country's telecommunications authority if you have questions about a specific radio service.

Where can I get cables to connect my radio to my tracker?

Our APRS products use the same radio cables as the Kantronics KPC-3 and the Byonics TinyTrak3. You can buy assembled cables from RPC Electronics.

T2-135 Tracker/TNC FAQs

Can the radio be used for both voice and data?

Each memory channel can be configured as either a voice channel or a data channel. When a data channel is selected, the TNC is automatically started and the speaker is muted.

The radio can be used for data or voice, but not both at the same time.

What GPS receivers are compatible with the T2-135, and how are they connected?

Any GPS receiver with a standard 4800 baud NMEA output may be used. NMEA input is accepted at either the front panel data jack (which can also provide power for a 5-volt GPS receiver) or the rear panel data connector.

Additionally, Garmin GPS receivers set to Garmin protocol mode may be connected to the rear panel data connector.

A null modem adapter is required to connect a GPS receiver to the rear panel data connector unless a custom GPS cable is used.

How do I reset the T2-135 to its default configuration?

Factory defaults are not stored in the device. To load the defaults, use the configuration program to reload the firmware. A prompt during the loading process will allow you to accept the default configuration.

Additionally, you may use the configuration program to save and later restore any number of configurations.

Because the configuration is stored in flash memory, it can be retained for a minimum of 10 years whether the device is powered or not.

Can the T2-135 be used as a digipeater?

Absolutely. The T2-135 is designed to function as a full-featured APRS digipeater, and can do so without interfering with its other functions. It supports multiple aliases, duplicate checking, multi-hop (WIDEn-N) operation, and preemption.

By default, the T2-135 will repeat packets with its own (MYCALL) callsign or the alias TEMP in the digipeater path. This allows any T2-135 equipped station to be used as an emergency or special event relay at need.

Can the T2-135 be used for BBS or mailbox operation?

Not by itself. The T2-135 is first and foremost an APRS device. It has no connected mode AX.25 capabilities on its own. It may, however, be used with host-based packet software in KISS mode.

What weather stations are supported by the T2-135?

Currently, the T2-135 can be connected to the Peet Bros. Ultimeter II and Ultimeter 2000 series (including the Ultimeter 800 and 2100), the Dallas/AAG TAI-8515 1-wire Weather Instrument, and the LaCrosse WS-2300 series.

Peet Bros. stations may be connected to either the front or rear data connectors. All other stations are supported using the rear panel data connector only.

Should I buy a DR-135T or DR-135TP to use with the T2-135?

The only difference between the two is that the DR-135TP comes with the Alinco EJ-41U TNC pre-installed. Since the T2-135 takes the place of the EJ-41U, there is no need to buy the TP model. However, if you already have a DR-135TP, you may easily remove the EJ-41U and install a T2-135 in its place.

Does the T2-135 support KISS mode? How do I use it?

Yes, the T2-135 supports KISS. Set AMODE KISS to enable KISS mode on the rear panel data connector. Because the front panel data jack is unidirectional, it can't be used for normal KISS operation. However, it can be used as a transmit-only KISS interface.

Keep in mind that the T2-135 has relatively small buffers. While they're adequate for APRS use, no guarantee is made of their suitability for modes requiring large packet sizes.

It is also important to note that the T2-135 will continue performing its other functions as usual while in KISS mode. This includes digipeating, tracking, weather station operation, and messaging.

To exit KISS mode, use the standard KISS exit sequence (C0, FF, C0) or hit control-C a few times.