I am using simpleusb.conf and it does not have “txboost” as a parameter. It appears I need this boost for the RIM-Lite as the TX level is too low. Can I just add “txboost = 1”?
I see txboost is in usbradio.conf but I’m using simpleusb.conf.
Roger
WA1NVC
You can always add it and give it a try. If it doesn’t work, or ASL won’t start successfully, you can easily go back and remove it. 
simpleusb.conf does not have a txboost option.
Is this a new change in ASL3? I’ve certainly used it before. It’s shown in the legacy wiki… SimpleUSB Channel Driver - AllStarLink Wiki
I’m not aware of any such option in the actual CM1xx ICs so would be interesting to know what this cfg actually did. I can say that without it though a CM108B puts out 3Vp-p just fine which is plenty for most radios. I will see if I can take a look later today through the app_rpt code and find some more details on this.
txboost was in ASL V1, V2, and HamVOIP.
I believe txboost was on by default. When it was off there was a 20 db attenuator on the output.
Those that have used HamVOIP will find the level for low impedance loads, line level 500 ohms, is too low without txboost = 1.
There is txboost in usbradio.conf. Why not in simpleusb.conf?
Roger
WA1NVC
First, I might add that I keep finding things in the wiki that are not exact but I can’t say if that is one of them. I never tried to verify it. Normally I might only look at it when a problem ensues. Much of that was copied from the old ACID version web documentation and seems to have had a lot of editor’s and edits.
Second, I would caution anyone trying to adjust audio willy nilly.
Not saying you might not have a problem, but are you identifying a good fix or covering for some other issue that is persistent like issues with a radio.
Most of those cheap imports do have deviation adjustments. I’m only adding that one should go towards the problem when possible. Not commenting on the problem itself.
But you do have to look for the source problem to correct it.
Listening to network connections, audio levels are all over the place.
If I recall correctly, during upgrades of chan_simpleusb.so it was determined that there was documentation of an option named txboost that didn’t actually exist. I’m not finding a reference right off but there is definitely not a txboost parameter in chan_simpleusb.
I’ve been using it in the past too.
K5TRA
Mike,
I’m using an HP8920 service monitor. The problem shows up when connecting to the low impedence connections of a Motorola Quantar. The input impedance is 470 ohms. The RIM-Lite with no amp after the CM119 cannot drive the Quantar to the correct level under ASL V3.
I suggest you try this test:
I found the output when set to 999 was about 2/3 of the input.
I repeated this test with an IRLP node also with no amp after the CM119 and the TX level was fine. This leads me to believe it is an ASL V3 problem.
Roger
WA1NVC
P.S. I know people running HamVOIP and they are not seeing this issue.
Roger, I was not directing any of that ‘at you’ or you specific issue, but a general statement for those that read this later looking for that easy fix.
This post will get more reads over the next year or more than it does while it is fresh.
The more we have added adjustments to the audio, the worse the quality of the network audio gets.
As long as it works for the user at their location, they don’t care.
Not sure why I do anymore really. I seem to be all alone.
Many make no real effort to be close. And they seem to be the ones that use the network the most.
I was not trying to hijack your thread. Sorry.
Hope you get a definitive answer for this issue that I can not provide.
However, have you looked at the input impedance to that quantar ?
Or compared with another ? Just a thought. I’m not really a good audio guy.
A CM119A DAC should be able to do 1.2Vrms (3.4Vpp) into 32Ω. Do you know what the stated audio input voltage sensitivity / max level is for the Quantar? Have you confirmed what actual voltage you see at that input with a 0dBFS test tone? Note that a test tone generated from the tune menu may be 6 ~ 10 dB down from full-scale.
Or, plug the URI into a PC where it will be recognized as a sound card and then play a full-scale ~1KHz test tone through it and confirm you get ~3.4Vpp at the URI output and Quantar input. You could also export the full-scale test tone to a ulaw file and play it from the node with a DTMF command.
From your description above it’s not clear what audio you are putting in to the node and how that is then showing up at the DAC.