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426 West Taft Ave.   Orange, Calif. 92865
Phone: 714-998-3021     Fax: 714-974-3420
US & Canada: 800-854-0547   Fax: 800-850-0547

E-mail:   •  

Com-Spec is also the source of the Selectone line of products.

Note:   Com-Spec will sell direct to the end user and can easily beat Hutton's, Tessco's and most others prices.
Call 800-854-0547 or 714-998-3021 from 8:00am to 4:30pm (Pacific time zone), Monday to Friday

If you have any data sheets that are not included below, please let us know!
We can have them scanned and then return them to you.
This page compiled by Mike Morris WA6ILQ.
Maintained by Robert Meister WA1MIK.

In the land mobile (e.g. commercial 2-way) world, there are (or were) three different companies that used the initials CSI. The most famous is Communications Specialists, listed above, and whose products are on this page. Then there is Connect Systems Incorporated, which made repeater tone panels for the commercial market and and autopatch equipment for the amateur market. They are located in Ventura, in Southern California (their previous address, still on the title pages of some of the downloadable manuals, was in Torrance, California) and they have their own web page at this web site. The third CSI company was Communications Systems Incorporated company in Lynnwood, in Washington state, which is long out of business. That "CSI" made, among other things, the CSI-32 and CSI Super-32 repeater tone panels that are a blue-gray color. Copies of the manuals are on the "Other Manufacturers" page at this web site. If anyone has copies of other manuals we'd appreciate a chance to scan them.
The three CSI companies are not (and were not) linked in any way
(except in the minds of a few clueless customers).

Click here to jump down to the Selectone products

Com-Spec Data Sheets

Many of the Com-Spec encoder products had a low output impedance which can load down other circuitry when connected. This is not a design fault of the Com-Spec product. Depending on the application it may be necesary to add a series restor between the encoder and the destination circuitry. The value of the resistor will range from 1 K to 47 K depending on the application.

Com-Spec 2003 catalog   1.13 MB PDF file
DCS-23 Instruction Sheet / Schematic   364 kB PDF file
This is a universal DCS encoder/decoder. Think "TS-32" for Digtal Coded Squelch (DCS). The more common name is Digital Private Line (DPL), a Motorola trademark or Digital Channel Guard (DCG), a GE trademark.
HP-1A Instruction Sheet / Schematic   200 kB PDF   This is a discontinued product. It was a stand-alone high pass audio filter board similar to the one contained in the TS-32 or TS-64 and is easily duplicatable on perfboard.
HP-1B Instruction Sheet   108 kB PDF   This is a discontinued product and consisted of the HP-1A packaged as a hybrid chip (that was manufactured by Murata for Com-Spec), and it is no longer available.
ID-8 Instruction Sheet / Schematic   364 kB PDF file
This is a generic CW ID board that can be added to almost any repeating radio. See the article by Jerry Matthews on the MICOR or MSR2000 pages.
ME-3 Instruction Sheet / Schematic   64 kB PDF   courtesy of Skipp
This was an encode only subminiature encoder that used plug-in ceramic resonators that had two pins on the bottom an an ink-stamped tone code on the top. The PC board had a range jumper - if the unit does not produce the correct tone you need to check for the absence or presence of the jumper.
There was also a ME-12 version of this that was in a plastic box with a rotary switch on the front and 12 tone element sockets inside.
ME-3 Instruction Sheet / Schematic   180 kB PDF file   courtesy of Bob WA1MIK
Larger, clearer, original scanned page, converted to PDF.
RB-1 Instruction Sheet / Schematic   86 KB GIF file (courtesy of Eric Lemmon WB6FLY)
The RB-1 adds reverse-burst to ME3s, TS-32s and other encoders. To change the duration of the reverse burst adjust the value of C3 or R13.
Here's the same file as a 95 kB PDF (courtesy of Eric Lemmon WB6FLY)
This is a discontinued product but it's easy to duplicate on perfboard.
Also, this circuit will work in any system that uses a reed-based decoder and also with some electronic decoders. It may not function with some newer radios because some manufacturers use 120 degrees phase shift for reverse burst instead of the 180 degrees that this unit provides. If anybody wants to modify it for a 120 degree shift let us know and we'll add the info here.
SS-32 Instruction Sheet / Schematic   Encode only     IC-107 version
SS-32P Instruction Sheet / Schematic   216 kB PDF   Encode only   IC-110 version
SS-32SMP Instruction Sheet / Schematic   149 kB PDF   Encode only, very small (surface mount version of the SS-32P)
SS-64 Instruction Sheet / Schematic   288 kB PDF   Encode only, with optional reverse burst
TP-38 community repeat panel documentation:
This was the predecessor to the TP-3200. The basic unit does not do digital squelch / DCS / DPL / DCG and in the beginning the sales literature said it could not be added. Later on a kit was developed that added it. The TP-38 is a handy unit that decodes any combinations of CTCSS tones and can allow your repeater to decode multiple tones. Just program it for zero hang time, then connect it to the repeater controller as if it was an external CTCSS decoder (which it is).
The TP-3200 community repeat panel was the follow-on to the TP-38. Here's all the documentation we've been able to find:
This unit does all 51 PL/CG/CTCSS codes and 106 DPL/DCS codes
While this is a terrific unit do not plan on using the internal IDer in amateur radio repeaters. The ID code speed is fixed at 25 WPM and can not be slowed down. It is, however a very useful unit that will allow your repeater to respond to any combination of CTCSS tones or CDCSS codes on the input.
TE-64 Instruction Sheet     211 kB PDF courtesy of N7FM     Photo
This is a scan of the sheet that was packed with the unit, somewhat cleaned up with a graphic editor. It contains the schematic, tone chart, programming, etc. Supposedly there was a second page.
TS-32 Instruction Sheet   This is the full 6-page 1.9 MB PDF data package containing the schematic, parts list, programming instructions, power connections, receiver connections (audio muting), high pass filter connections, multi-tone information, troubleshooting, etc.   IC-107 version.
Note that the hangup pin must be grounded or it won't decode. This is the single most common installation error...
The TS32 electronics spawned several other products including several boxed products that used a rotary switch to select the tone. Some just had the switch, some also had a two-digit digital display. Here's a photo of a non-display unit.
TS-32HB Instruction Sheet / Schematic   4 pages, 262 kB PDF.   Encode / Decode   courtesy of Eric Lemmon WB6FLY.
TS-32P Instruction Sheet / Schematic   1 page, 50 kB PDF.   Encode / Decode     IC-110 version.
TS-64 Instruction Sheet   288 kB PDF   This is the full data package containing the schematic, tone chart, programming, etc.
Additional information on the TS-64 can be found here, courtesy of Mike Morris WA6ILQ.
Note that the hangup lead (the violet wire) must be grounded or the decode output (the white wire) won't show any indication. This is the single most common installation error...
TS-64WDS Instruction Sheet   1.02 MB PDF file   Courtesy of Com-Spec
This is a new variant on the TS-64 that has some differences that make it attractive for repeater stations... One is that they have added an audio gate function.


Modification of the TS-32 for shorter release time   By Bob Schmid of S-Com Industries
Modification of the TS-32 for faster response time   Information supplied by Com-Spec

Other Information

Five Position DIP Switch Table for the TS‑32 and other five-switch models   By Mike Morris WA6ILQ
     This chart has both the "Group A" (subaudible) and the "Group B" (audible) tone tables
Six Position DIP Switch Table for the TS‑64 and other six-switch models   By Mike Morris WA6ILQ

Hookup Information

Generic notes on TS-32 Hookup   By Kevin Custer W3KKC
TS-32 To GE Master Exec   112 kB PDF   from Com-Spec
TS-32 To E.F.Johnson Repeater   145 kB PDF   donated by James Duram
TP-3200 community repeat panel to Motorola MSR-2000 repeater   39 kB PDF   from Com-Spec
TP-3200 community repeat panel to Motorola MICOR station   99 kB PDF file   from Com-Spec
TS-64 to Mitrek mobile hookup   32 kB PDF   from Com-Spec
Com-Spec also makes a little daughterboard for the TS-64 so it'll plug right onto the P908 pins in a GE MASTR II station (right in place of GEs tone board). Look for the TS-64MSTII on their price sheet. There is a modification article on the TS-64MSTII on the GE page at this web site.

In 2000 Com-Spec purchased

and continues to support the products that were current at that time.
Clicking on the logo above will take you to the Selectone products web site.
Note: Selectone used the "DigiTone" and "SmarTrunk Systems" names on some products.

Here are some Selectone products data sheets:
...and if you have any data sheets we don't, please scan them and send them in!

Selectone ST-100 CTCSS Encoder   178 kB PDF   Donated by Eric Lemmon WB6FLY
Selectone ST-101 CTCSS Encoder-Decoder   300 kB PDF   Donated by Eric Lemmon WB6FLY
Selectone ST-101   8.5x11 format: page 1   page 2   page 3   page 4   Tunable miniature encoder-decoder.   Donated by John J. Riddell VE3AMZ.
Selectone ST-104 CTCSS Encoder-Decoder   342 kB PDF   Encoder-decoder with RX PL filter.   Donated by Eric Lemmon WB6FLY.
Older version of the Selectone ST-104   8.5x11 format: page 1   page 2       Large format: page 1   page 2   Donated by Laryn Lohman K8TVZ
Selectone ST-133   140 kB PDF   non-tunable, dip-switch programmed, encode only.   MX315-based.
Selectone ST-138   124 kB PDF file
This encode-decode board was used in some ACC products, and has an RX audio filter.
To recognize it look for an MX-355<some letter> chip and a 6-position DIP switch.
It is interchangeable with the ST-104.
Selectone ST-139   233 kB PDF   a DIP-switch replacement for the ST-146 encoder-decoder.   MX-465 based.
Selectone ST-140   107 kB PDF   Replacement for the ST-100 encode-only unit.   Tunable.
Selectone ST-146   263 kB PDF   Replacement for the ST-104 encoder-decoder (with audio filter).
Selectone ST-1600 Community Repeater Tone Panel:     These four sections all donated by Wes Fay KA7UEC
      System Documentation   8.5x11 format:   page 1   page 2   page 3
      Selectone ST-1600 Schematics   8.5x11 format: page 1   page 2  
      Selectone ST-010   8.5x11 format: page 1   page 2   A carrier control timer module
      Selectone ST-012   8.5x11 format: page 1   page 2   page 3   page 4   An audio-squelch module
Selectone ST-180:    
      Selectone ST-180 Installation and Operation Guide   3.2 MB PDF
      Selectone ST-180 Summary   1.6 MB PDF
Selectone ST-210   290 kB PDF (courtesy of Eric Lemmon WB6FLY)
This unit is a two-tone sequential decoder, sometimes called a 1+1 decoder.
This PDF covers both the ST-210A and ST-210B - there is a difference.
Selectone ST-800 Subminiature DTMF Decoder   102 kB PDF file

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Web page design, layout, hand-coded HTML and Copyright (c) by Mike Morris WA6ILQ March 2002.

This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by Kevin Custer W3KKC and multiple originating authors. All Rights Reserved, including that of paper and web publication elsewhere.