[App_rpt-users] SCOM 7330

Mon Feb 4 08:42:10 UTC 2013

yeah .... be very careful with pin 9 

too much voltage on that pin can burn out the CM chip.  I killed a CM108 this way back when I was making a homebrew fob ..

Ken

-----Original Message-----
From: REDBUTTON_CTRL <jrorke at cogeco.ca>
Cc: app_rpt-users <app_rpt-users at ohnosec.org>
Sent: Sun, Feb 3, 2013 11:09 pm
Subject: Re: [App_rpt-users] SCOM 7330

Hey good stuff! The pin 21 has the inline cap and a level scaling so it can be driven with a little higher levels. 
The other thing is pin 9 is direct input and some DC biases will muck thinks up. I suspect thats what happened here.

Glad you got it going.

Jon RQ
On 2/3/2013 4:57 PM, Steve Schulze wrote: 
Thanks Jon.

This is exactly what I had to do. 

I had this system running here at home on the bench with a TKR-750 connected directly to the URI and no problems. So, I made a mistake and thought pin 9 would work for the 7330 too. Apparently, I was using the AC coupled output on the Kenwood, so it worked fine. Once I switched to the AC coupled input on the URI from the 7330 the thing lit up and I was able to set the input level in Asterisk.

Thanks for all of your help. It's funny how we look past the obvious sometimes.

It's official. Node 27727 is now running in it's permanent location!

Amateur Radio - The Original Social Media
Steve Schulze - Radio Amateur, General Class - N9UDO
dministrator, Baraboo, Wisconsin D-Star System - WB9FDZ
dministrator, Baraboo, Wisconsin AllStarLink Systems - 27616, 27727
reasurer, Badgerland Amateur Television Society - KB9SFS
http://yellowthunder.org/dstar.html
On 2/3/2013 15:07, REDBUTTON_CTRL wrote:

Hi Steve, ok I think you said you were using pin 9 on the URI? I use pins 21 and 22 on my audio connections. I have attached a diagram of the URI to 7330. This should work.
Most of my stuff is wired to connect to radios using the RLC wiring but the connections to the URI are the same.
This diagram is for the 7330 to URI.

Jon

On 2/3/2013 1:35 PM, Steve Schulze - N9UDO wrote: 
I have all of this done. I can see 1vPP on the input to the uri. But when I do the radio tune rx voice I get a failed response from no audio. I have tried a different uri as well.

Thanks.

Sent from my Verizon Wireless 4G LTE Smartphone

-------- Original message --------
From: REDBUTTON_CTRL <jrorke at cogeco.ca> 
Date: 02/03/2013 10:31 AM (GMT-06:00) 
To: 
Cc: app_rpt-users at ohnosec.org 
Subject: Re: [App_rpt-users] SCOM 7330 

I suggest setting audio levels on the controller first, then do the URI 
adjustments.

Set as follows:

in usbradio. conf the audio setting should be :

rxdemod=speaker
txprelim=no

This assumes the audio on the 7330 port is de-emphasized and does not 
require pre emphasis to and from the node.

Disconnect the URI from the 7330.

1) Send a full quieting signal to the repeater with a 1k tone @ 3k 
deviation. Set the TX audio level on the controller URI port to 1v p-p.
2) Connect an 1K audio tone @1vp-p  to the RXA pin on the controller 
port and gound the COR in line. Adjust input level to get 3k deviation 
on the repeater TX.

Now you have the controller levels fixed. You new need to adjust the URI 
to these settings.

Connect the URI and node to the controller.

3) Send a full quieting signal with the 1k k tone /3k deviation to the 
repeater and on the URI CLI console do a RADIO TUNE RXVOICE to measure 
the input level.
(Dont worry about the RX noise adjustment - not required as you are not 
doing any DSP with this setup)
4) Do a RADIO TUNE TXVOICE 500 and measure the repeater deviation.
5) Repeat step 5 with different level until 3k deviation is reached on 
the repeater TX  deviation.
6 Do a RADIO TUNE SAVE  the set the audio levels on the node.
7) you are done.

On 2/3/2013 11:13 AM, Steve Schulze wrote:
> Thanks Dave for the tip. I'm heading back out to the site to work on 
> this some more. I will give the pull-ups a try. Maybe that's why it's 
> not streaming out.
>
> How did you resolve the setting of the receive levels running 'radio 
> tune rxnoise' etc, with the URI connected in this manner?
>
>
>
> Thanks!
>
> Amateur Radio - The Original Social Media
>
> Steve Schulze - Radio Amateur, General Class - N9UDO
> Administrator, Baraboo, Wisconsin D-Star System - WB9FDZ
> Administrator, Baraboo, Wisconsin AllStarLink Systems - 27616, 27727
> Treasurer, Badgerland Amateur Television Society - KB9SFS
>
> http://yellowthunder.org/dstar.html
>
> On 2/3/2013 09:05, Dave Maciorowski wrote:
>> Mornin' Steve,
>>
>>> Anyone have a working node using an SCOM 7330 in line?
>>>
>>> I currently am trying to get these two to work. It's about 80% right 
>>> now.
>>>
>>> Audio from the node box is making it to the repeater and keying the 
>>> transmitter, no problem there. The problem I'm having is the audio 
>>> from the repeater not getting into the node box. I see the audio on 
>>> a scope at pin 9 (mic_in) on the URI. I also have a transition from 
>>> high to low on pins 7 and 8 (COR Det and CTCSS Det) when the 7330 
>>> tells it to transmit.
>>
>>   We are working on this now.  I just built a cable and needed to add 
>> a pullup resistor at the URI COR input between pins 8 and 14. If 
>> you're using the CTCSS input, you need one there, too.  I added the 
>> pullup in the DB-25 shell.
>>
>>> On the 7330, I'm using port 1 for the repeater. Port 3 is connect to 
>>> the URI.
>>>
>>> Paths on 7330 as follows:
>>> RX-1 to TX-1
>>> RX-1 to TX-3
>>> RX-3 to TX-1
>>>
>>> In rpt.conf I have duplex=0 and linktolink=on
>>>
>>> In USB radio I have carrierfrom=usb and ctcssfrom=usb
>>
>>   73,
>>
>>     Dave
>>
>
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