[App_rpt-users] Simplex node with RPi and discriminator audio
Marshall Oldham
ke6pcv at cal-net.org
Fri May 10 00:52:51 UTC 2019
Keith,
Sure not a problem.
One item to consider so that these settings will work for everyone.
Currently the DMK URIxB receive gain on Pin 21 is low, this is due to a resister value that is being changed in the next revision.
If you do not have a URIxB and you have a URI or URIx you should be fine and can use pin 21 for the receiver input from the radio.
If you have a URIxB then you should use Pin 9 on the URIxB along with the 1K resister and a non polarized 10uf Cap in series to protect the CM119B chip as there is no protection on pin 9 of the DMK URIxB.
usbradio_tune_usb_45024.conf
[usb_45024]
; name=usb_45024
; devicenum=1
devstr=1-1.2:1.0
rxmixerset=500
txmixaset=640
txmixbset=500
rxvoiceadj=0.177778
rxctcssadj=0.177186
txctcssadj=100
rxsquelchadj=500
fever=1
usbradio.conf
[general]
[usb_45024]
eeprom = 0 ; EEPROM installed: 0,1
; 0 = no (default)
; 1 = yes
hdwtype = 0 ; Leave this set to 0 for USB sound fobs modified using
; the instructions from usbfob.pdf. Use a setting of
; 1 is for Dingotel/Sph interfaces.
rxboost = 1 ; 0 - 20db attenuator inserted
; 1 - 20db attenuator removed
; Set to 1 for additonal gain if using a low-level receiver output
rxctcssrelax = 1 ; reduce talkoff from radios w/o CTCSS TX HPF
; Do not change this, leave this as a 1
rxsqhyst = 3000 ; Setting Squelch Hysteresis
; 3000 is the default amount.
; An amount of 500 seems good.
; Then set the squelch to the highest number revealed when doing a "radio
; tune rxsquelch" - running the command multiple (like 20) times in a row.
; <http://allstarnode.com/wiki/lib/exe/fetch.php?media=asterisk-notes-wj8g.pdf>
txctcssdefault = 100.0 ; default TX CTCSS frequency, any frequency permitted
rxctcssfreqs = 100.0,91.5 ; RX CTCSS frequencies list in floating point. must be in table
txctcssfreqs = 100.0,91.5 ; TX CTCSS frequencies list. any frequency permitted. will follow RX CTCSS frequency
rxctcssoverride = 0 ; Set to 1 to start out in carrier squelch mode
carrierfrom = dsp ; no,usb,usbinvert,dsp,vox
; no - no carrier detection at all
; usb - from the COR line on the USB sound fob (Active high)
; usbinvert - from the inverted COR line on the USB sound fob (Active low)
; dsp - from RX noise using DSP techniques
; vox - voice activated from RX audio
ctcssfrom = dsp ; no,usb,usbinvert,dsp
; no - no CTCSS decoding, system will be carrier squelch
; usb - from the CTCSS line on the USB sound fob (Active high)
; usbinvert - from the inverted CTCSS line on the USB sound fob (Active low)
; dsp - CTCSS decoding using RX audio in DSP.
; rxdemod option must be set to flat for this to work.
rxdemod = flat ; input type from radio: no,speaker,flat
; no - RX audio input not used
; flat - Use RX audio from discriminator (before de-emphasis)
; speaker - use de-emphasized audio
rxsquelchdelay = 30 ; delayline in ms carrier squelch tail eliminator
rxondelay = 0 ; Number of 20mSec intervals following the release of PTT.
; Uncomment and/or adjust for simplex nodes to eliminate "Ping Ponging"
; or "Relay Racing". A positive value here will instruct the usbradio
; driver to ignore the COR line for a specified number of 20mSec
; intervals following the release of PTT. Use this ONLY on simplex
; nodes, and leave commented out for repeaters or other full duplex nodes.
txboost = 0 ; Add transmitter audio gain boost: 0,1
txprelim = yes ; Audio processing on left output channel: no,yes
; no - Audio is not pre-emphasized and limited.
; Suitable for use on a microphone input
; yes - Audio is pre-emphasized and limited.
; Suitable for direct connection to an FM modulator
txlimonly = yes ; Audio limiting with no pre-emphasis on output channel: no,yes
; no - Audio is not limited.
; yes - Audio is limited.
; Suitable for transmitters with no limiting but with pre-emphasis.
txtoctype = notone ; Transmit tone control type: no,phase,notone
; no - CTCSS tone encoding with no hang time
; phase - encode CTCSS and reverse phase
; AKA ("reverse burst") before unkeying TX
; notone - encode CTCSS and stop sending tone before unkeying TX
; AKA ("chicken burst")
txmixa = composite ; Left channel output: no,voice,tone,composite,auxvoice
; no - Do not output anything
; voice - output voice only
; tone - CTCSS tone only
; composite - voice and tone
; auxvoice - auxiliary voice output at headphone level for monitoring
txmixb = no ; Right channel output: no,voice,tone,composite, auxvoice
; no - Do not output anything
; voice - output voice only
; tone - CTCSS tone only
; composite - voice and tone
; auxvoice - auxiliary voice output at headphone level for monitoring
invertptt = 0 ; Invert PTT: 0,1
; 0 - ground to transmit
; 1 - open to transmit
duplex = 0 ; Duplex 0,1
; 0 - half duplex
; 1 - full duplex
duplex3 = 0 ; duplex 3 gain setting (0 to disable) ???
#includeifexists custom/usbradio.conf
I hope this helps you out.
73
Marshall - ke6pcv
From: App_rpt-users [mailto:app_rpt-users-bounces at lists.allstarlink.org] On Behalf Of Keith Williamson
Sent: Thursday, May 09, 2019 7:30 AM
To: Users of Asterisk app_rpt
Subject: Re: [App_rpt-users] Simplex node with RPi and discriminator audio
Hi Marshall,
Thanks!
Would you mind sharing both your usbradio.conf and usbradio_tune_usb*.conf?
Those would provide a great baseline for me. I'll still need to tweak deviation but your settings should get me close.
73,
Keith
KF7DRV
On Wed, May 8, 2019 at 5:51 PM Marshall Oldham <ke6pcv at cal-net.org> wrote:
Keith,
I just had a chance to test out your configuration. I happen to have all the hardware on hand.
RPi 3 Model B with DMK URIxB connected to an Alinco DR-135 radio set for 9600 baud packet. (Discriminator Audio)
I was able to set the audio levels and CTCSS levels without any issues. I used a service monitor to do so.
Receive and transmit audio sounded fine.
CTCSS decode/encode on the radio also seems to work using the USBradio channel driver.
DSP squelch works well.
I ran several tests using 100.0 Hz for CTCSS decode on the receiver.
There may be one slight issue, but if you are running simplex node at home, it may not really be an issue, just something for you to be aware of.
Here are my findings:
88.5Hz = NO decode falsing
91.5Hz = decode falsing
94.8Hz = decode falsing
97.4Hz = decode falsing
103.5Hz = decode falsing
107.2Hz = decode falsing
1109Hz = = NO decode falsing
I hope this helps out.
73
Marshall - ke6pcv
From: App_rpt-users [mailto:app_rpt-users-bounces at lists.allstarlink.org] On Behalf Of Keith Williamson
Sent: Sunday, May 05, 2019 11:37 AM
To: Users of Asterisk app_rpt
Subject: [App_rpt-users] Simplex node with RPi and discriminator audio
I'm wondering if this is a realistic configuration for a simplex node:
RPi3 with DMK URI connected to the 9600 audio in and out signals of an Alinco DR-135T. I want to be able to use CTCSS so that random signals don't get bridged to connected nodes.
My concern is that with the above configuration, the CTCSS decode in the radio is bypassed. Consequently, CTCSS decode needs to be done via usbradio since simpleusb does not have this capability. However, I keep hearing that usbradio is not handled well with an RPi and yields less than ideal audio quality.
So all of the above implies that I either use a higher performance node PC or continue to use the RPi, switch to the 2400 audio in and out signals (so that the Alinco can handle the CTCSS) and use simpleusb.
Opinions?
Thanks,
Keith
KF7DRV
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