[App_rpt-users] Something is rotten in the state of Denmark

[Pierre Martel]

Goerge, if you take a look at the receiver part of the mrs 2000 you will see that it connect to the back plane by a connector, those connection then goes to various part of the repeater for filtering and tone detection on vairous different cards.. I take the audio signal directly from pin 5 of the receiver board. I dont see any filtering on the reciver board.  In fact from the service manual that you can find here (for the vhf receiver) http://www.repeater-builder.com/motorola/msr2000/pdfs/vhf-msr2000-receiver.pdf

on page 7 there is a block diagram of the receiver and we can easily see that there is no audio limitting and or filtering at all on the board.  Nad the leevl that I can see on my scope is pretty close to 250 mv as stated on the service manual..

I think that the trouble is with my settings..


I am working on the 28739 node.

here is my usbradio.conf file

[general]

[usb27821]

hdwtype=0
rxboost=1
txboost=1
rxctcssrelax=1
txctcssdefault=103.5
rxctcssfreqs=103.5
txctcssfreqs=103.5
;rxctcssoverride=0
carrierfrom=dsp
ctcssfrom=dsp
rxdemod=flat
txprelim=yes
txlimonly=no
txtoctype=no
txmixa=composite
txmixb=composite
invertptt=0
duplex=0
rxondelay=1
rxnoisefiltype=0
eeprom=1

[usb28739]

hdwtype=0
rxboost=0
txboost=0
rxctcssrelax=0
txctcssdefault=103.5
rxctcssfreqs=103.5
txctcssfreqs=103.5
;rxctcssoverride=0
carrierfrom=dsp
ctcssfrom=dsp
rxdemod=flat
txprelim=yes
txlimonly=no
txtoctype=no
txmixa=composite
txmixb=composite
invertptt=0
duplex=1
rxondelay=0
rxnoisefiltype=1
eeprom=1

I did not touch the 27821 one since I put it down to use one main controler not a machine connected to port 3 of our rc210, so I know its not ok..


when i try to tune the base noise....

ve2mrc*CLI> radio active usb28739
Active (command) USB Radio device set to [usb28739]
ve2mrc*CLI> radio tune rxnoise
tune rxnoise maxtries=12, target=27000, tolerance=2750
tries=0, setting=2, meas=1754
tries=1, setting=16, meas=16505
tries=2, setting=16, meas=17517
tries=3, setting=16, meas=15942
tries=4, setting=16, meas=15816
tries=5, setting=16, meas=16604
tries=6, setting=16, meas=17943
tries=7, setting=16, meas=17805
tries=8, setting=16, meas=15489
tries=9, setting=16, meas=18234
tries=10, setting=16, meas=16747
tries=11, setting=16, meas=17647
DONE tries=12, setting=1000, meas=17647, sqnoise=5040
ERROR: RX INPUT ADJUST FAILED.

then I set rxtone and rx voice. but I have a long tail of noise (about 500 ms) before it stop then I have no sound and the courtesy tone..

I never saved my settings before making test, would that be the problem? do i need to save the settings every time I adjust the system so that the settings are used in my test?




From: George Csahanin 
Sent: Friday, March 29, 2013 2:33 AM
To: Pierre Martel 
Subject: Re: [App_rpt-users] Something is rotten in the state of Denmark

Pierre, are you sure that you are getting wideband noise to the usb device? Before de-emphasis? I am looking at a manual for a MSR2000 and it shows a "variable gain amplifier (U1) which feeds the squalch detector, but alsdo feeds a low pass filter on its way to the noise gate and also feeds a de-emphasis network (U2). Any audio after that cannot have enough hi frequency component to make the setup for tune rxnoise work properly, which will not let the squelch work properly. The long squelch tail you refer to is usbradio not having its squelch set properly. And that cannot be done without wide band noise in. The result would never have enough hi freq noise at the uri to actually squelch the radio. What is eventually kmuting it is the end of input PL tone...

Just my thoughts, but I have never had my hands on a MSR2000. I own one, just haven't received it yet. 

GeorgeC
W2DB
2360


  ----- Original Message ----- 
  From: Pierre Martel 
  To: APP RPT 
  Sent: Wednesday, March 27, 2013 9:38 PM
  Subject: [App_rpt-users] Something is rotten in the state of Denmark

  Got that phrase in the head, and could not find a good title for the mail ;-)

  Ok Here I am again.

  Still with my project to have a full App_rpt controler for my 2 repeater system.


  I manage to have our msr 2000 in the shack today cause the exiter is giving us some trouble.

  so I said, lets fix the exiter AND plug in the URI so that I wont have to do this on site.

  exiter is ok, well for now...

  So I connect the URI pin 22 (mic AC) to pin 5 of the receiver inside the msr2000, why 22 there is a big dc bias at this place so uning the mic dc would nt be wise, I beleive..

  now I go to the computer set active radio usb 28739

  now I do radio tune rxnoise.. It fail.

  there is at leat 200 mv of audio there. changed rxboosst in usbradio.conf for that node, reload, no difference.

  still did the radio tune rxvoice and rxtone.

  then tested without saving , I have a big white noise at the end of every receiption before the coutesy tone..

  what Am I doing wrong?

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