Tom Rondeau wrote:
>
> On Tue, Apr 19, 2011 at 2:35 PM, ish13 <
address@hidden> wrote:
>
>>
>> Ok I had used the muliplier in a previous code using Frequency Modulation
>> which is why I used it again. But thanks for that. I will change it to
>> a
>> smaller value.
>>
>> I also had it set up with the interpolation to 512 and the decimation to
>> 256
>> but it didn't work either. Though I will set these values to the range
>> it
>> has to fall between.
>>
>> As for the transmitter, I had connected the output of the modulation
>> block
>> to a scope to see if it was transmitting the correct waveform, which it
>> was.
>> Though the problem came when I try to receive. When I tune into the
>> frequency I am transmitting at there is no signal at all, which I am not
>> sure why that is happening.
>>
>> Ismael
>
>
> Just connecting to the scope inside the transmitter isn't likely to tell
> you
> too much. You want to see it at the receiver. The fact that you are not
> seeing it at the receiver helps.
>
> What interpolation are you using at the transmitter when looking for the
> received signal?
> What gain settings?
> What frequency?
> What daughterboards are you using?
> What version of GNU Radio and GRC?
>
> Tom
>
>
>
>> Tom Rondeau wrote:
>> >
>> > On Tue, Apr 19, 2011 at 2:03 PM, ish13 <
address@hidden> wrote:
>> >
>> >>
>> >> I am using DBPSK, but I am not receiving anything when I transmit my
>> >> signal.
>> >> I attached the flow-graphs from the companion. Can someone look
>> through
>> >> it
>> >> and tell me if it is correct?
>> >>
>> >> Thanks
>> >> Ismael
>> >>
>> >>
http://old.nabble.com/file/p31434999/Receiver.png Receiver.png
>> >>
http://old.nabble.com/file/p31434999/Transmitter.png Transmitter.png
>> >>
>> >
>> > A few issues. First, don't set the multiplier to 32k as you will
>> probably
>> > start to over drive the amplifier. I tend to keep this at a max of 15k.
>> >
>> > More importantly, though, you're interpolation and decimations are set
>> to
>> > 4k
>> > and 2k, respectively. You cannot use this large of a number. The max
>> (if
>> I
>> > recall) are 512 for interp and 256 for decim.
>> >
>> > It's also helpful to start the transmitter and use the usrp_fft.py
>> program
>> > to make sure you are receiving what you think you are receiving.
>> >
>> > Tom
>> >
>> > _______________________________________________
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>> >
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>> >
>> >
>>
>> --
>> View this message in context:
>>
http://old.nabble.com/Receiving-DBPSK-side-not-working.-tp31434999p31435221.html
>> Sent from the GnuRadio mailing list archive at Nabble.com.
>>
>>
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