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KJ6ZD Amateur Radio Accessories currently offers
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EI-151 (Echo-Link Interface Controller) Full featured controller interface with timeout timer and improved audio processing.
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CTCSS unit, this unit can be used in older Transceiver to beef them up for use with PL'ed Repeater systems.
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FT-150 a Fake Transceiver that can mimik a transceiver to a Multi Port Repeater Controller.
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Not yet released, EI-160 Echo-Link Interface with ALC, timeout timer, improved audio and more.
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Please click at the Shop button to make a purchase. The checkout is performed by Google checkout and is safe through their secured server.
If you are working with GPS NMEA sentences and need to calculate the checksum for a sentence, here is a Windows application that can do this for you. The download and use of this application is absolutely free, but without any implied or expressed warranty. USE AT YOUR OWN RISK!. Click here to install
NOTE: By clicking install the software will be downloaded and installed onto your computer. Every time you start this software, it will check for an update and install the update if available
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 RLC2010 more info!
The RLC2010 was developed to offer a single board solution to the growing Echo-Link communities. Although there are other solutions to link or hardwire a repeater for use with the Echo-Link system, it is unfortunately more for the technically inclined HAM radio operator. In many cases the operator needs to design and built accessory boards, do a significant amount of wiring etc. to get a repeater linked to the Echo-Link system. Such a prepared system may lack features that are very common in today's HAM Radio world.
Here are some features of the RLC2010:
- Receiver audio is processed through an Automatic Audio Level Control circuit with a dynamic range of +14... -43 dBm. With ALC there is no input audio adjustments necessary. Simply feed the audio, that's it. If variations on the input audio occur the circuit will compensate for it. This produces a fixed level to the distant VoIP station and also at local transmissions in repeater mode.
- The DTMF decoder get their correct signal levels for most reliable DTMF decoding within the specified dynamic range.
- Optionally, two CTCSS decoder can be used in addition to a separate Carrier detect signal (CAS). When used in simplex mode the CTCSS can also encode the standard plus tones while transmitting. The encoder/decoder is fully software programmable and can be remotely switched off.
- Furthermore an optional Audio delay line can be used to eliminate squelch crashes and mute DTMF tones completely to the Internet Host computer.
- A specially designed audio path switch matrix does provide utmost flexibility in linking the individual ports.
- There are also 4 Auxiliary audio inputs for such things as NOAA weather alerts.
- A pre-recorded audio chip-corder provides up to 8 minutes of announcements, system status, time and much more information about the system status. A special recording block allows users to record and play back their audio to verify signal strength and quality.
- A total of 5 Digital alarm inputs that are over voltage protected are available via on board header.
- Use a total of 5 over voltage protected Analog to Digital inputs to measure such things as Temperature, AC voltage or DC voltage. If an RSSI signal is provided (0-3.3 Volt) the system can provide even input signal strength measurements.
- The Main Micro Controller is a PIC type that operates at 40 MIPS (40 million instructions per second) to carry out any task instantly.
- A secondary Micro Controller is used to generate CW and Courtesy tones. It also takes care of the Expansion header for features not been thought of yet. The unit produces a CW sine wave not a hard sounding Square wave.
- A battery backed Real Time Clock is used for scheduled tasks and of course to make Time announcements.
- The Controller has two independently controlled FAN switch circuits that can drive even larger Fans.
- User selectable Echo-Link interface mode either Echo-Link for Windows or the on popularity gaining SVX link system protcols are implemented.
- Audio that is routed to the Echo-Link host computer is processed through a Tone Control circuit that can significantly improve the audio quality send over the Internet.
- A quick visual system check can be done by checking the 11 LEDS that show PTT, DTMF, COR, PL TONE, 12 Volt, 5 Volt, and 3.3 Volt status on the Fly. If they need to be switched off, simply tell it via DTMF command.
- A windows compatible programming interfave is in planning to ease the many programming tasks.
The above are the initial features that may be expanded. The 16 bit PIC has enough horsepower to produce almost PC results.
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