A U.S. Manufacturer of Repeater and Interoperability Controllers and Accessories

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S-COM at Hamvention 2019

S-COM will again be at Hamvention 2019 this year in the same spot as last year.  We're located with the Repeater-Builder group of companies/organizations/projects that includes: Repeater-Builder (web site), Repeater-Builder (the company), S-COM Controllers, Masters Communications, AllStar Link, DVswitch, MMDVM, RepeaterBook, and others.  S-COM Bob WA9FBO and S-COM Dave WA1JHK are going to be there.  (Lexi N0LXI has a conflict this year and can

Bob's Blog #16: Surface Mount Technology

Most of today’s electronic manufacturing is done in Surface Mount Technology (SMT), developed in the 1960s. It was formerly done in Through-Hole Technology (THT), which is now considered a secondary operation by assembly houses.

The 7330 main board contains 710 components, the majority of which are SMT. What’s involved in SMT manufacturing? It starts with the board.

Bob's Blog #15: Plectron Encoding with the 7330

A benefit of the 7330’s highly flexible design is its ability to generate tones in old or obsolete formats, allowing it to breathe new life into radio systems that may otherwise have to undergo expensive upgrades. For example, a customer recently needed a tone encoder for a legacy Plectron paging system. Here’s what we did and how you can program Plectron tone page macros into your Release 1.8 or newer 7330.


7330 Firmware and Tools Release 1.8 Is Available!

Release 1.8 is now available.

This release has four significant new features:

-- DTMF Mute Bypass.  There are new DTMF Mute Bypass software switches that enable the ability to disable the DTMF Mute and ignore commands on a specific path for that one transmission.  This makes it easier to control remote equipment.

Bob's Blog #14: Connector Breakout Boards

For repeater builders who don’t enjoy soldering wires to the small solder cups on D-subminiature cable connectors, there’s a simple solution: breakout boards, also known as terminal boards.

 A breakout board lets you connect wires to a D-sub via convenient screw terminals. Boards are available with male or female DE-9, DE-15, DA-15, and DB-25 connectors, and some come with plastic enclosures.

Bob's Blog #13: COR Pulse Triggered Macro

In a previous blog we talked about using Long Tone Zero (LiTZ) to reliably trigger a macro with just a single DTMF digit. Now, how about a system that requires no DTMF at all?

WPWNC 1The S-COM 5K, 6K, 7K, and 7330 support a feature known as COR Pulse-Triggered Macro (PTM). PTM lets you trigger a macro by simply clicking your mic button several times in succession.

Bob's Blog #12: Long Tone Zero (LiTZ)

S-COM’s 6K, 7K, and 7330 support a feature known as Long Tone Zero, or LiTZ. If you’re not familiar with it, read on!

LiTZ is a system for requesting aid during an emergency. It’s simple: Transmit a DTMF “0” character for at least 3 seconds and then announce your emergency. Nearly all modern mobiles and handhelds have DTMF keypads, so no additional hardware is needed by the user.

Bob's Blog #2: 7330 Internal Audio Levels

(Revised 07-03-2018)

The 7330 User Manual’s Appendix B (Installation) recommends adjusting the three receive audio pots for 1 V peak-to-peak as measured by an oscilloscope at test points TP9 (RX1), TP10 (RX2), and TP11 (RX3).

The 1 V p-p level is maintained throughout the audio section of the controller. This blog explains why that level was chosen.

Bob's Blog #11: Coin Cells

Lithium coin cells (batteries) are very popular for timekeeping and memory backup applications. Ever wonder why?


Fast facts

The output voltage is 3 V, roughly double that of other common battery types. Designers can use one lithium coin cell instead of two cells of other chemistries.

Bob's Blog #10: Memory

Let’s take a stroll down Random Access Memory Lane to see how controller memory evolved over the years.


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