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VE7AXY Canada flag Canada

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I use call sign VE7AXY for my Winlink RMS Pactor gateway. It is situated in the Comox Valley, Vancouver Island.

The equipment is as follows:

  • Motorola Micom 2TS HF (Body of radio only, used without control head)
  • SEA 1612 auto tuner
  • 33ft vertical antenna
  • Pactor SCS DR7800 Dragon P4
  • Older Toshiba laptop running Trimode and RMS Hybrid Relay, and Motorola Micom software MRC for radio setup.

I recently upgraded my RMS Gateway system. Previously, the HF radio was an older Amateur Icom radio, it was starting to show signs of age and became less reliable.

 I was wondering what to replace it with and had two spare radios on the shelf to choose from: A kenwood Ts850S and an HF Motorola Micom 2TS body (without the control head)

I chose to try the Micom HF radio as the Kenwood 850 was too nice of a radio to dedicate to the RMS 24/7 VE7AXY gateway.  After some test, here is how I did it and some of the nice advantages which resulted from this choice of radio.

I custom made a cable for the 44pin connector on the back of the Micom radio.  This cable allowed for the Audio and PTT connection to the SCS DR-7800 Pactor 4 modem, as well as the RS232 com port to the laptop PC for software radio control. Also I installed an on-off switch on the appropriate front connector of the radio as well as speaker out wires.

  Once this was done, I could start, run and setup the radio. I could set parameters such as baud rate, power, etc. using the MRC Motorola control software.  The rest was easy, RMS Trimode controls the radio, changes frequencies, and responds to any Pactor Winlink calls.

Here are some of the advantages of this present system:

ADVANTAGES OF THE HF MOTOROLA MICOM 2TS BODY

  • Low cost HF commercial radio, this Micom body was obtained for 200$ on the surplus market.
  • Radio is completely enclosed (even waterproof!), no fan, no fan noise
  • There are no relay click emanating from the radio, frequency/band change on filter board is achieved via switching diodes.
  • The radio is designed for 125 W, I have it running about 75W during digital data transmission, so there is no heating problems.

ADVANTAGES OF THE SCS DR7800 PACTOR MODEM

  • Can be internally switched to Balanced audio input/output (Which is really convenient, since the Motorola radio requires balance audio on it’s rear connector.)
  • Has Bluetooth connection between the modem and the PC. One less cable, and a system less prone to RF interference.
  • Runs Pactor 4, Robust Packet and is backwards compatible with Pactor 1,2, & 3
  • Is very reliable and easy to setup.

I also have RMS Express on the PC and in an emergency or special need, I can disable the RMS gateway software and run RMSExpress as a Winlink client. This take no time as all cables remain the same.

There you have it, for anyone needing more info pls contact me. SEE PICTURES OF THE SYSTEM BELOW;

 

 

 

 

 

Jean-Claude Daehler

VE7OI (sysop for VE7AXY) formely HB9IBZ

 

6850837 Last modified: 2015-11-12 22:30:31, 5872 bytes

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