Up one level (GE Index) Back to Home

MASTR III Stations External Repeater Controller Interface Submitted by Matt Krick K3MK FluX Research

The information herein was originally provided by WA1ZMS and NØNDP.

HARDWARE:

All necessary I/O signals can be found on the back-plane interface connectors as follows:

Conn	Pin	Function
P5	1	+12V DC
P5	4	DC Ground
P5	9	Receiver Audio Low
P5	10	Receiver Volume/Squelch High (raw discriminator audio, NOT de-emphasized)
P5	17	CAS (Carrier Active Squelch, active HIGH) (i.e. COR)
P5	20	RUS (Receiver UnSquelched, active HIGH) (i.e. CTCSS & COR)
P2	8	Transmit Audio High
P2	9	Transmit Audio Low
P2	14	Transmit PTT (active LOW)

The pin assignments for P5 are shown below.

The pin assignments for P2 are shown below.

On the T/R Interface board, set jumper J104 to short pins 2 and 3 and set jumper J105 to short pins 2 and 3. See the image below for their locations.

SOFTWARE:

Use the standard MASTR III programming software to set the following fields:

• Single channel, DC remote
• RF Simplex = NO
• RPT = NO
• PTT options: set all CCT and DODT to "NO", set all CG encode to "YES"
• Pot settings: TX pot = 200, CG pot = 120, Line out = 0, RPTR gain = 1023, Line in = 0, DSP line cancel = 0, DSP line in = 20, DSP compressor = 1023, DSP Comp Threshold = 32767
• Squelch pot = "manual"
• Morse code = "disabled"
• F7 options = set all to "disabled" except Control Line = "4 wire"
• Program TX/RX frequencies as desired

Align and tune the RF portion of the station as described in the installation/tuning instruction manual. de WA1ZMS Oct 1999.

Updated with service manual excerpts of P2, P5 and J104/105 added by NØNDP Dec 2005.

Acknowledgements and Credits:

The submitter takes no responsibility for any damage during the modification or for any wrong information made on this modification. Your results may vary.

Commercial use of this bulletin is not authorized without express written permission of the submitter.

Furthermore, this work is specifically prohibited from being posted to www.mods.dk or any other 'limited free site'. Please ask for permission before posting elsewhere.

Contact Information:

The submitter can be contacted at DCFluX [ at ] yahoo [ dot ] com.

Back to the top of the page
Up one level (GE index)
Back to Home

This page first posted 19-Jul-2008

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.