[App_rpt-users] MSF to RTCM Wiring

Tue Sep 16 16:16:55 UTC 2014

The repeater will be one of three. Each will communicate with a master
server in a commercial data center where our business is located. If I have
read correctly this is a hub? At any rate the CLB's will be run with RTCM as
non-voted but with synchronized TX. I have the Motorola modules for this.

  _____  

From: KJ6KO [mailto:kj6ko at innercite.com] 
Sent: Tuesday, September 16, 2014 8:27 AM
To: Robert
Subject: Re: [App_rpt-users] MSF to RTCM Wiring

Hi Robert,

  It mainly depends on how you are going to use the system.  If it is just a
stand alone repeater, the RTCM is a bit of overkill, but will work fine.  I
have done a couple of MSF's.

  Assuming this is just a standalone CLB repeater (the one with the EPROM),
and not a voted system, I like to keep things as simple as possible.
Program the repeater to be a "Base Station", NOT a repeater!.  Pull RX audio
from the DISCRIMINATOR output of the MSF and make sure the RTCM is set to
PLFILTER=YES  and  DEEPPHASIS=YES.  The COR/PL Detect on a MSF is a bit
trickey.  You have to pull it off of a chip and use a transistor to switch
it.  For TX, just use the PTT and MIC Input.  That is the simplest way.  You
can also feed raw TX audio directly into the modulator from the RTCM and
have the RTCM generate the TX PL if you like, but that is a bit more
complicated.  I have done it, but I don't really see much of an advantage.
ALl these connections are Test Points on the MSF, (Except the COR/PL) and
that makes connection easy.  ALSO, set the squelch on the RTCM a bit high!
The RTCM's squelch circuit is a bit touchy.

  NOW, if you have a CXB (programmable MSF) it is all basically the same
except that you can program an output of the MSF for "Valid PL Signal" and
use that as the COR/PL input to the RTCM.

I don't use the internal controller as the repeater.  I have never been real
satisfied with the audio quality of the MSF repeated audio.  Best to let the
RTCM do all the work and digitally filter the DISC audio rather than let the
MSF do it!  The RTCM will do all the controlling, tail, ID and courtesy
tones for you.   Also, don't forget to disable the MSF's TX Timer!  

 Unless you are using a voting system, the URI is a MUCH cheaper source and
does everything you want for just a standalone repeater, assuming you have a
computer to go with it.  I use the Beaglebone!  The URI as it will also act
as the controller, filter the DISC audio and one thing it does that the RTCM
won't do is you have REMOTE audio control!  That way, after you install the
repeater on a hilltop, and you think the audio is a bit high or low, you can
remotely bump it up or down to your hearts content!   The RTCM is all manual
control!

Good luck and 73...

Greg   KJ6KO

----- Original Message ----- 

From: Robert <mailto:robert at controlservers.net>  

To: app_rpt-users at ohnosec.org 

Sent: Monday, September 15, 2014 11:01 PM

Subject: [App_rpt-users] MSF to RTCM Wiring

I have seen so many different ways of how to wire a controller / RTCM to a
MSF 5000 - is there one sure fired way to do this? Poor eyesight on my part.
I hate being the new guy.

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