Re: [Discuss-gnuradio] I2C Addresses

[Alan Gray]

Thanks for pointing out the blindingly obvious to me Robert, I took a 
further look at the source code after reading this and it all fell into 
place. I'm still unsure as to why the address 0x61 is used instead of 0x60 
for the microtune module in the GNU radio code, however I now have the 
module talking to me using 0x60.

I've now run into another problem, as the 4702 employs only one 
down-conversion stage I'm a little light on gain. As a quick stop-gap 
measure (I'm still working on designing a second down-conversion stage with 
associated gain) I'm considering replacing the 390 ohm feedback resistors 
on the OPA691 with something larger, say 3.9k, to boost things up a bit 
there. Not being altogether RF savy I thought I'd throw the idea out here 
before do anything rash.

So, is there going to be any major problem with this strategy? If anyone 
has other suggestions as to how I should go about getting a little more 
grunt out of my system, I'd appreciate them as well.

Alan

At 09:16 AM 7/09/03 -0700, you wrote:


> Without looking at anything I note that I2C addresses are 7-bit numbers.
>
> The specified address is shifted left one bit then or'ed with 1 for read
> or 0 for write.
>
> Forgive me if I've missed something, or this is already obvious.