[AudioI] Ultra 2 -10dB Input and Mic

[Matt Flax]

Hi Jonathan,

 

Is VLF SDR where you do very low radio frequency signalling through the ground ? What types of frequencies do you use ?
 

 

Regarding the top level Ultra IO board and the middle level Ultra preamplifier board ...
 

 

The -10 dB header on the board is for the balanced line inputs, like XLR and TRS. The other connector is for RCA inputs and ground connections.

 

If you don't plan to use the onboard microphones, then you don't need to connect the middle header on the front of the preamplifier board. Although having said that one of its pins is a ground connection, so it is another anchor between two board's ground planes.
 

 

Matt

 

p.s. You can only post to the list once you join it !

 
On 9/11/21 4:54 am, JONATHAN RIZZO wrote:
 
 
 
 
 
Hi All, Matt,
 

 
 
I purchased an Ultra 2 (for use with a VLF SDR project) and I was just wondering about some of the interconnects.
 

 
 
On the IO board (v1.8), what is the -10dB header used for? I'd like to use the input channels without any attenuation. If so, should I just omit soldering this header?
 

 
 
Also, I need to use the line inputs and don't want to be collecting sound from the onboard microphones, so on the preamp board (v1.13), do I just omit soldering the mic header? For reference, I'm using the Ultrasound v1.24. 
 
 

 
 
Thanks.
 

 
 
Jonathan
 
 
 
 

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