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RADIO COMMUNICATION LABS
SAFE SPEAK HF3 Hands-Free Microphone
User's Manual
Revised March 29
Firmware Revision 7
Radio Communication Labs
Trading as Ralph Parkhurst and Associates
ABN 31 841 821 803
Ringwood North, VIC 3134
AUSTRALIA
Telephone:
+61 (0) 401 718 265
Email:
admin@radcomlabs.com
Web:
www.radcomlabs.com
Copyright © 2020 by Radio Communication Laboratories
ALL RIGHTS RESERVED
2020
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Table of Contents
Summary of Contents for Radio Communication Labs SAFE SPEAK HF3
- Page 1 RADIO COMMUNICATION LABS SAFE SPEAK HF3 Hands-Free Microphone User’s Manual Revised March 29 2020 Firmware Revision 7 Radio Communication Labs Trading as Ralph Parkhurst and Associates ABN 31 841 821 803 Ringwood North, VIC 3134 AUSTRALIA Telephone: +61 (0) 401 718 265 Email: admin@radcomlabs.com...
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Page 2: Warranty
In no event will Radio Communication Labs be liable for more than the amount of your purchase price, not to exceed the current list price of the product, and excluding tax, shipping and handling charges. - Page 3 Introduction Congratulations on purchasing a from Radcom Labs, the SAFE SPEAK HF3 third generation of our unique Hands-Free microphone system for two-way communications. The HF3 can be used with almost any radio (mobile, base station or handheld). It is ideal for either permanent installation in a vehicle or temporary use for emergencies or special events.
- Page 4 Features of the SAFE SPEAK HF3 - Pre-built hardware for plug-and-play operation - Adjustable microphone gain control - Adjustable bass and treble audio equalisation - All adjustments are made using multi-turn trim pots for fine ‘tweaking’ - 8 choices of timeout timer duration can be configured:...
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Page 5: Installation
Installation Power Connection: Many modern radios provide +5v or +8v or +9v at the microphone connector – this will power the HF3 directly from the mic socket with a single cable to suit your radio (e.g. RJ45 to RJ45). Radios that do not provide +DC power at the mic socket can still be used - in these cases 12 volts can be applied separately to the HF3’s “12V DC”... -
Page 6: Microphone Placement
The PTT transmit line to the radio is an “open collector” output that is driven logic low (i.e. to ground) during transmit, as required by most transceivers. In the rare instance you need to invert the sense of this PTT line, you can solder a jumper on the PCB at position “A”... - Page 7 RADIO socket (viewed from in front of the HF3’s RADIO connector) 1 – DC Power from radio (5-10 volts DC) 2 – Not used 3 – Not used 4 – PTT Transmit (this pin is switched to ground when transmitting 5 –...
- Page 8 Alignment of Bass and Treble equalisation The Bass and Treble are pre-adjusted when the unit undergoes testing before it leaves the factory. If you want to make changes, proceed as follows: 1. Start by rotating the Bass and Treble trim pots anticlockwise for at least 20 turns - this will ensure that they are all at their minimum value to begin with.
- Page 9 Operating the HF3 To transmit using the HF3, just briefly press the TX button. The LED will light to indicate you are “ON THE AIR” and your radio will now be transmitting. Initially your HF3 will have a timeout period set for 2 minutes – this means that after 2 minutes of continuous transmission, the PTT line to the radio transceiver will switch back to receive.
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Page 10: Specifications
d) After you count the number of flashes appropriate to the timeout period you desire, turn off the radio (and the HF3), pause for a moment, then turn it back on again. The new timeout value is now stored permanently. e) If for some reason you don’t wish to use the timeout at all, it can be disabled by soldering a jumper on the PCB in position B, but only do this if you have a valid reason for doing so! - Page 11 if the audio processing (compression) within the radio is set higher than about 15%. Q. Can the HF3 be used with Digital radios like DSTAR/Fusion? A. Yes, it has been used with radios like the ID880 and it works perfectly. Very complimentary audio reports have been received.