Re: Question about Basic TX/RX boards, the I, Q

GNU Radio
1

I am having the same problem of being able to receive on RX_A but not
RX_B and I don’t know why. Any help would be much appreciated.

Thanks
Nick
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Hi, all.

Today I try an old QPSK transmission program on Basic TX/RX and failed.
However, it does work well on rfx2400.
I just simply connect TX 1 of Basic TX on transmitter to RX 1 of Basic
RX on
receiver. The receiver program failed to synchronize with pilot
sequence.
The carrier frequency is 100Mhz.
Is the signal from TX 1 is just I or Q path of the complex signal? I saw
signal come out from both TX1 and TX2.
BTW, I could only receive signal from RX1 of Basic RX and nothing from
RX2.
Very confusing. :slight_smile:

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Hi, all.
 
Today I try an old QPSK transmission program on Basic TX/RX and failed. However, it does work well on rfx2400.
I just simply connect TX 1 of Basic TX on transmitter to RX 1 of Basic RX on receiver. The receiver program failed to synchronize with pilot sequence.
The carrier frequency is 100Mhz.
Is the signal from TX 1 is just I or Q path of the complex signal? I saw signal come out from both TX1 and TX2.
BTW, I could only receive signal from RX1 of Basic RX and nothing from RX2.
Very confusing. ^_^
 
 

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2

On Fri, Mar 16, 2007 at 09:49:47AM -0400, [email protected] wrote:

I am having the same problem of being able to receive on RX_A but
not RX_B and I don’t know why. Any help would be much appreciated.

Thanks
Nick

Assuming the Basic Rx is on the “A” side, use -R a:1 to access the RX_B
input.
The Basic Rx is treated as having two distinct subdevices.

Matt, please re-label the inputs on the Basic Rx with less ambiguous
names. Perhaps something like “Input 0”, “Input 1”. Likewise for the
Basic Tx.

Eric

3

Eric B. wrote:

Assuming the Basic Rx is on the “A” side, use -R a:1 to access the RX_B input.
The Basic Rx is treated as having two distinct subdevices.

Matt, please re-label the inputs on the Basic Rx with less ambiguous
names. Perhaps something like “Input 0”, “Input 1”. Likewise for the
Basic Tx.

That isn’t the problem he is seeing. The problem is that he wants to
receive in IQ mode rather than real mode. No confusion about labels
there.

In the mean time, there are about 500 of those boards already built, but
I’ll be happy to change the labels when I build the next batch, some
time in 08 :slight_smile:

Matt