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Re: [Discuss-gnuradio] question about mux
From: |
cswiger |
Subject: |
Re: [Discuss-gnuradio] question about mux |
Date: |
Thu, 25 Aug 2005 13:36:58 -0400 (EDT) |
On Thu, 25 Aug 2005, Martin Dvh wrote:
> Hi Chuck,
> >I'm expecting
> > to get a 1Khz signal in one channel and 2Khz in another channel,
> > but end up with the two getting mixed etc.
> >Now if I disconnect the wire connect J19 to J48 ch1 & ch2 indeed flatline
> as expected.
> How do ch 3 & 4 look when you disconnect the wire connect J19 to J48.
>
> You only set the tx_freq for channel 0
> sink.set_tx_freq(0,5e6)
>
> You should also do
> sink.set_tx_freq(1,5e6)
>
> This means you output frequencies of 5.001 Mhz and 5.002 MHz.
>
Ok - I was assuming all DDC/DUC's were set to the same.
When the other cable between J19 & 48 is removed the scope
channels 3 & 4 flatline, just as expected.
I did add sink.set_rx_freq(1,5e6) and get exactly the same
results - which is interesting - even setting sink.set_rx_freq(1,0)
has no effect at all - however sink.set_rx_freq(0,0) results in
no signal, as expected, since we're sending at 0hz baseband
and receiving at 5e6 DDC.
So, if sink.set_rx_freq(1,freq) is working then the mux 0x00A8
isn't routing thru DUC 1.
I'll just probe and try things and see what works.
Thanks.
--Chuck