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DTMF Accessory Squelch (partial kit)

The DAS (DTMF Accessory Squelch) acts like a switch connected in series between the speaker output of your VHF or UHF transceiver and an external speaker. DAS will monitor a radio channel for you, with the speaker switch open so the speaker remains silent, until someone sends one of the DTMF sequences you have selected. When DAS hears your personal Touch-Tone ID sequence on the radio channel it will light a LED, sound an buzzer and close the series speaker switch so that you can hear the audio of the calling station.

Listen to Product Description

An introductory discussion of DAS was published in QST, December, 1995, pages 25-31. The "DAS Configuration Reference Guide", this paper, provides a more complete description of each programming option, the purpose of the option and how the various options may interact.

There are also a series of DAS application notes that may be of particular interest to those with special application needs. All relevant DAS documentation, other than the QST article itself, is available electroncially from the TAPR FTP file server as well as the ARRL BBS.

DAS and PCON and there use in Emergency Communications


DAS Partial Kit Include
The partial DAS kit includes the PC board, almost all components that mount on that board, including TB1 and TB2, the screw terminal blocks, and all ICs. The micromputer (U1) included with the kit is a uV erasable microcomputer pre-programmed with the DAS firmware. Sockets are included for all DIP ICs. You get one relay for K1. TAPR is selling a "partial" kit of the DAS (DTMF Accessory Squelch) system described in QST (QST Dec 1995, pages 25-31). We say it's "partial" because not all components described in the QST article are provided with the kit. Specifically, TAPR is only selling the PC board and almost all of the parts that mount on that board. See below for details.

The price for the DAS (DTMF Accessory Squelch) is:

  • $ 40 US for members of TAPR

  • $ 45 US for non-members

    + shipping/handling if applicable.
(Place Web Order)

DAS Partial Kit DOES NOT INCLUDE
any of the off-board items:

  • no connectors
  • no LEDs
  • no LED current limiting resistors
  • no switches
  • no horn/buzzer
  • no enclosure
  • etc

You can get these items from catalog suppliers or Radio Shack, if you don't already have them in your junk box. TAPR does not supply a relay for K2 since most users will not need that part. If you need K2 for your application, you can get that at Radio Shack as well. Also, TAPR does not supply any of the header posts or the shunts for the header posts -- you don't really need them. Install a wire jumper (or solder blob) at H2 & H3 -- the others headers can remain open.

TAPR DAS pricing reflects our costs and a markup associated with our cost of doing business. Profit, if any, is consumed by the organizations "next" project. We wish the prices for parts and kits could be lower, but considering what we have to pay our distributors to get these hard to find components, and our contractors to combine and package the parts to form the kits, it's expensive -- and we know it. We are sorry we are unable to offer lower prices, but our prices do reflect fair value.


Documentation

The following documents are currently effective for the DAS system (QST, December, 1995, pages 25-31) as of November 5, 1995.

    List of Publications
    Most recent version (12-14-95/Iss-3) of "DAS List of Publications". That's this document. Data is in plain ASCII text format of 60 lines per page (suitable for most ink jet and laser printers). Just use DOS PRINT command.

    DAS Ref Guide (Text)
    DAS Ref Guide (Download and Extract 16K)
    Most recent version (11-05-95/Iss-1) of "DAS Configuration Reference Guide". Data is self extracting archive. Extracts to plain ASCII text format file. ASCII text file paginated for 60 lines per per page (suitable for most ink jet and laser printers). Just type DASCRG1 at the DOS prompt. After de-archiving process is complete type PRINT DASCRG1.TXT to print file on printer.

    Download DAS Assembly Manual (276K)

    DAS Errata Information
    Most recent version (11-05-95/Iss-1) of "DAS Errata Information". Data is in plain ASCII text format of 60 lines per page (suitable for most ink jet and laser printers). Just use DOS PRINT command.

    DAS Object Code (HEX)
    DAS Object Code (TXT)
    Most recent version (12-14-95/Iss-2) of DAS object code in Intel Hex format.

    Most recent version (12-14-95/Iss-2) of DAS object code with prose introduction and pagination. Data is in plain ASCII text format of 60 lines per page (suitable for most ink jet and laser printers). Just use DOS PRINT command to print. See file of same name with HEX extension for just Intel Hex code.

    Apps Note 1 -- Operating with Fewer Controls and Indicators
    Most recent version (11-05-95/Iss-1) of "DAS Application Note 1 -- Operating with Fewer Controls and Indicators". Data is in plain ASCII text format of 60 lines per page (suitable for most ink jet and laser printers). Just use DOS PRINT command.

    Apps Note 2 -- Selective Group Calling
    Most recent version (11-05-95/Iss-1) of "DAS Application Note 2 -- Selective Group Calling". Data is in plain ASCII text format of 60 lines per page (suitable for most ink jet and laser printers). Just use DOS PRINT command.

    Apps Note 3 -- How to use DAS with a Scanning Radio
    Most recent version (11-05-95/Iss-1) of "DAS Application Note 3 -- ScanSop -- How to use DAS with a Scanning Radio". Data is in plain ASCII text format of 60 lines per page (suitable for most ink jet and laser printers). Just use DOS PRINT command.

    Apps Note 4 -- Automated Methods of Acknowledging SELCAL Messages
    Most recent version (11-28-95/Iss-1) of "DAS Application Note 4 -- Transponding -- Automated Methods of Acknowledging SELCAL Messages". Data is in plain ASCII text format of 60 lines per page (suitable for most ink jet and laser printers). Just use DOS PRINT command.

    Apps Note 5 -- Special Remote Control Applications and Operations
    Most recent version (11-28-95/Iss-1) of "DAS Application Note 5 -- Special Remote Control Applications and Operations". Data is in plain ASCII text format of 60 lines per page (suitable for most ink jet and laser printers). Just use DOS PRINT command.


Acknowledgment

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