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Technical Information on Products by
426 West Taft Ave. Orange, Calif. 92865
Phone: 714-998-3021 Fax: 714-974-3420
US & Canada: 800-854-0547 Fax: 800-850-0547
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 courtesy of A. Nony Mous|
|DCS-23 Instruction Sheet / Schematic 364
kB PDF courtesy of A. Nony Mous
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 courtesy of A. Nony Mous
This is a generic IDer board that can be added to almost any repeating radio. See the article on the Micor page.
|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 Photo by
A. Nony Mous
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|
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|
|Generic notes on TS-32 Hookup By Kevin Custer WJ8G|
|TS-32 To GE Master Exec 112 kB PDF from Com-Spec|
|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
Donated by A. Nony Mous
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 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 donated by A. Nony Mous|
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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.