[App_rpt] Still Looking for help to get the anode backup and

[Stephen Rodgers]

Will,

I answered your question below....

Steve.



Will wrote:
> Steve,
> 
> See below.
> 
> 
> 
>> If you are getting receive audio through all of the op-amps, then it has
>> to be a receive audio level problem. (either its too high or too low).
>> You are going to have to put the system in duplex=2 to properly adjust
>> the levels. (See my question below)
> 
>> Also, when you logged in, a few weeks ago, I noticed that your receive
>> audio was way too high. This will cause just as many DTMF decode issues
>> as not enough level.
> During that time the audio was not adjusted, I was playing around withe the permissions.
> If you hear audio then that is good, I didn't think audio was passing through the system from
> from the transmit from another radio or maybe it was from the connect command?

No. I heard distorted IRLP connect messages, so that was real receive audio.


>> Also, did you follow the audio level adjustment procedure and set the
>> transmit audio to 3 KHz deviation followed by setting the receive audio
>> with a 1 khz signal source so that you get 3KHz of deviaton on the
>> output, per the instructions? Using voice or touch tones will result in
>> the levels being set incorrectly.
> Well yes and no. I did read the procedures, I have a ham friend with a signal generator thats coming over when he have the time to induce the required
> signals on the receive circuit. But in the mean time I have a 1kh wav file signal on my other linux box that I can induce the signal
> in the receive circuit. This is how I tested the milivolts on the op-amps IC, U1B and U1C 

This would be preferred.


> 
>> This all beings up another question. Are you trying to adjust levels
>> without using instrumentation such as a signal generator, service
>> monitor, or deviation meter? It is really difficult to get the system
>> adjusted without this instrumentation by an inexperienced user. I can do
>> it by ear, but it isn't as good as when I do it with instrumentation.

> Yes, I do remeber the talk on the audio adjustment and will not connect to any other node until I
> get the audio right. I do have an ocilliscope and the Ham friend have the a signal generator right now
> I have some time to work on it but the ham schedule is quite different and we have to get together when time permits.
> 
>> If you don't have instrumentation, I would try doing the following: Call
>> into app_rpt using the reverse autopatch feature (you will need to set
>> this up in extensions.conf). Unsquelch the receiver so that you get COR
>> and receiver noise. Turn the RX level pot all the way counterclockwise
>> until you hear nothing (silence). Gradually turn up the RX level pot
>> until you hear some noise, they try using an HT to send DTMF commands.
>> If the tones don't mute, or sound chopped up, try increasing the RX
>> level until you get the tones to mute, and commands start being recognized.
> 
>> NOTE: If you have a receiver with a lot of RX audio output, the RX pot
>> will be touchy, and a fraction of a turn will result in a lot of
>> receiver noise being heard. If this is the case, carefully adjust the
>> pot until you barely hear the noise at first.
> 
>> If DTMF tones don't mute, regardless of the setting of the RX audio pot,
>> try the opposite de-emphasis setting on the ARIB and repeat the above
>> procedure.
> 
>> This procedure isn't the best, and I wouldn't recommend it as an
>> alternate way to set the receive levles, but It should allow you to
>> figure out what is going on with the receive audio.
>> Why did you go to duplex=0 instead of duplex=2? That makes it very
>> difficult for to set levels.


> I'am trying two different radio/controller configurations. I will shorlty move the repeater off the commom repeater
> controller then on to the ARIB as the full duplex repeater controller, duplex=2, then take another connections to the common
> controller to control it from asterisk using duplex=0, which have 3 other radio ports plus a RS232 port hopefully for 2m agile operations.
> Yeah, I know it's the long way around but I have the equipment on hand and I might as well put it to work. 
> 
> I do appreciated all your help and having lots of fun tinkering.
> Will / W4WWM
> 
> 
> 
> 
> 
> 
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