[App_rpt-users] Repors of low/bassy audio

[ARS W5OMR]

using chan_usbradio on a pi3 driving a Motorla R100 rptr

I'm wondering if my preemphasis and limiting looks good to you guys?

I've made changes, and am -not- noticing a difference when I go back
to the console and 'reload' or even do an 'astres.sh' at the command
line prompt.
~shrug~

Rig is a Motorola R100
using a URIx

usbradio.conf looks like:

;
; Usbradio channel driver Configuration File
;

[general]

[usb_29655]

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 = 0             ; 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 = 500          ; 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 freq, any frequency permitted
;rxctcssfreqs = 100.0   ; rx ctcss freqs in floating point. must be in table
;txctcssfreqs = 100.0   ; tx ctcss freqs, any frequency permitted
rxctcssoverride = 1     ; Set to 1 or yes to start out in carrier squelch mode

carrierfrom = usb       ; 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 = usb         ; 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 = 20          ; 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


;#################
;#  section of interest           #
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 = no          ; 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.
;# end section of interest      #
;#################

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
                        ; This is the collector lead of the 2n4401 on
the modified
                        ; usb sound fob.
                        ; please refer to the howto for the procedure
to do this.

duplex = 1              ; Duplex 0,1
                        ; 0 - half duplex
                        ; 1 - full duplex



-- 
73 = Best Regards,
-Geoff/W5OMR