[arm-allstar] Interfacing with Icom UR8050

[David McGough]

Hi Steve,

Setting linktolink=yes and duplex=0 is the config typically for a simplex
link radio, not a full-duplex repeater....So, I don't think that config is 
exactly what's needed, in this situation.

If the repeater hardware itself is internally coupling the receive audio 
back to the transmitter, the mode duplex=3 will probably get the desired 
results. This setting is in the node stanza in rpt.conf, of course.

Here is a web page showing the various duplex settings:

http://ohnosec.org/drupal/node/84


If the transmitted and or received audio sound muffled, that can also be 
caused by improper deemphasis or preemphasis settings in the 
simpleusb.conf file---for example: if the repeater is setup for "flat" 
audio input and output, then both deemphasis=yes and preemphasis=yes need 
to be set in the simpleusb.conf.


73, David KB4FXC





On Mon, 26 Sep 2016, Steve Agee via arm-allstar wrote:

> Matt:
> 
> Hard to say from this end, but is it possible that your repeated audio 
> is being looped around twice? Once by the node and once by the repeater? 
> Audio loop around should only happen in one place or the other, but 
> never both. The app_rpt has an allowance for this using the 
> "linktolink=yes" line. If indeed you are looping the audio in both the 
> node AND the repeater, this would account for the audio sounding the way 
> you are describing it. Just a guess from this end. I believe if you end 
> up using linktolink=yes you must also change from duplex=2 to duplex=0 
> and the linktolink=yes line should be added just above or below the 
> duplex=0 line.
> 
> Good Luck!
> N5ZUA
> 
> On 9/26/2016 4:36 AM, Matt via arm-allstar wrote:
> > I'm using a modified USB fob with an Icom UR8050 repeater. Everything 
> > seems to be working as it should from the node side but I have a small 
> > issue what I connect the usb fob to the repeater.
> >
> > It seems to muffle/distort the repeater tx audio. For example, If I 
> > connect via the node and TX then the repeater goes into TX mode and 
> > transmits the audio received from the node just fine. However, the 
> > repeater courtesy tone is distorted when the audio transmission ends. 
> > Another example is when there is no connections to the node and the 
> > repeater sends it's ID. The repeater goes into TX and sends the Morse 
> > ID but it sounds distorted and very quite. If I unplug the USB fob 
> > then the repeater works just fine.
> >
> > Just to clarify, I'm using the built in repeater logic to control the 
> > RF side of things and I don't want the node to send any tones or ID. I 
> > just want it to send repeater audio out to the AllStar network and 
> > send Allstar audio to the repeater.
> >
> > My connection like like this...
> >
> > Fob TX Audio - Repeater LI (Modulation signal input with 300-3000Hz 
> > 6dB/oct emphasis)
> > Fob Ground - Repeater GND
> > Fob RX Audio - Repeater LO (Detected signal output with 300-3000Hz 
> > 6dB/oct de-emphasis)
> > Fob PTT - Repeater EXT PTT (External PPT input. Connect to ground to TX)
> > Fob COS - Repeater BUSY (Becomes high impedance while receiving)
> >
> > I have duplex=2 in my rpt.conf and duplex=1 in my simpleusb.conf is 
> > that correct?
> >
> > Matt
> > M0LMK
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