Hey John,
On 24/06/11 15:06, John Ackermann N8UR wrote:
> Marcus D. Leech said the following on 06/21/2011 07:54 PM:
>
>> I have an example, in GRC, attached.
>>
>> It uses an audio source, which is common to all three modulators, this
>> goes to a fractional interpolator to interpolate up to the
Marcus D. Leech said the following on 06/21/2011 07:54 PM:
I have an example, in GRC, attached.
It uses an audio source, which is common to all three modulators, this
goes to a fractional interpolator to interpolate up to the basic
sample rate of 200Ksps, which is an integral divisor of 100Msps
On 06/21/2011 04:40 PM, John Ackermann N8UR wrote:
Thanks, Nick. I missed the sample rate factor because I was thinking of USRP1.
I'll fix that and the fallacy of adding rates, and try again.
Thanks,
John
I have an example, in GRC, attached.
It uses an audio source, which is common to al
On Jun 21, 2011, at 4:08 PM, Nick Foster wrote:
Couple of things. First of all, when you add two signals together, you
> don't add the sample rates. Two 256ksps streams added together still
> result in a single 256ksps stream. Second, 256ksps is not a factor of
> 100Msps, so the USRP2 picks the c
On Tue, 2011-06-21 at 15:54 -0400, John Ackermann N8UR wrote:
> Thanks, all, for the replies.
>
> For my simple test case, I'm trying just two modulators with a frequency
> translating FIR following each, one set to 0 Hz and the other to +25kHz.
>
> I set the NBFM modulator quadrature outputs to
Thanks, all, for the replies.
For my simple test case, I'm trying just two modulators with a frequency
translating FIR following each, one set to 0 Hz and the other to +25kHz.
I set the NBFM modulator quadrature outputs to 128ksps, then add them
together and feed to the USRP at 256ksps. (At
On 21/06/2011 12:05 PM, Alexandru Csete wrote
Sorry, I meant multiply with a complex sine or cosine wave of
frequency f, where f is the offset.
Marcus suggested using filters, which will also work but it's a bit
overkill for a simple translation, isn't it?
Alex
Yes, it's overkill, but I
On Tue, Jun 21, 2011 at 09:05, Alexandru Csete wrote:
> Marcus suggested using filters, which will also work but it's a bit
> overkill for a simple translation, isn't it?
>
That depends on the sample rate of the original NBFM stream. Likely, it is
only high enough for its own bandwith. If you
On Tue, Jun 21, 2011 at 4:08 PM, Alexandru Csete wrote:
> On Tue, Jun 21, 2011 at 3:28 PM, John Ackermann N8UR wrote:
>
>> In GRC I would like to combine the outputs of several NBFM modulator
>> blocks to drive a USRP sink. The idea is to output several discrete
>> channels within the USRP tran
> In GRC I would like to combine the outputs of several NBFM modulator
> blocks to drive a USRP sink. The idea is to output several discrete
> channels within the USRP transmit bandwidth, e.g., three signal
> channels at -30 kHz, 0 kHz, and +30 kHz offset from the USRP tune
> frequency.
As was al
On 06/21/2011 06:28 AM, John Ackermann N8UR wrote:
> In GRC I would like to combine the outputs of several NBFM modulator
> blocks to drive a USRP sink. The idea is to output several discrete
> channels within the USRP transmit bandwidth, e.g., three signal
> channels at -30 kHz, 0 kHz, and +30 kH
On Tue, Jun 21, 2011 at 3:28 PM, John Ackermann N8UR wrote:
> In GRC I would like to combine the outputs of several NBFM modulator blocks
> to drive a USRP sink. The idea is to output several discrete channels
> within the USRP transmit bandwidth, e.g., three signal channels at -30 kHz,
> 0 kHz,
On 21/06/2011 9:28 AM, John Ackermann N8UR wrote:
In GRC I would like to combine the outputs of several NBFM modulator blocks to
drive a USRP sink. The idea is to output several discrete channels within the
USRP transmit bandwidth, e.g., three signal channels at -30 kHz, 0 kHz, and +30
kHz of
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