On 10/28/2020 09:07 PM, Barry Duggan via USRP-users wrote:
Hi Neel,
Thanks for the quick response! As a clarification:
- for half-duplex operation, is the receiver muted (and protected)
during transmit?
The receiver is switched to the RX2 port whenever the ATR logic
determines that transmission is occurring. It's not clamped or anything,
just switched to the RX2 port. Which if that port has no antenna, or
is terminated will protected the receiver. The receiver WILL
receive your own transmissions--because the RX/TX switch isolation is
only about 30dB.
- I could not find the sample rates on your website.
The master clock rate determines the allowable sample rates, and the
master-clock rate can be a very large number of discrete
values between something like 5Mhz and 61.44MHz. The maximum
decimation is, I believe, 512.
So, the to-the-host sample rate has to be a proper integer fraction of
the master clock rate, and the master clock rate is programmable.
So the answer to the question 'what sample rates does it support' is
"geez, man, really a lot".
Now, having said that, I did at one point in the last few years see an
equation that describes the allowable master clock rates.
The allowable master clock rates aren't exactly "arbitrary", but
pretty large. My tendency is to pick a clock rate that is 4 times
my desired sample rate. Most of the time, that works. Except when I
choose a sample rate that happens to yield a required
master clock rate that isn't allowed by the clock PLL. For me, that
is rare. For others, that may not be.
---
Barry Duggan KV4FV
https://github.com/duggabe
On 10/28/20 7:57 PM, Neel Pandeya wrote:
Hello Barry:
On the B200mini, you can transmit (on the TX/RX port) and receive (on
the RX2 port) at the same time.
The minimum sample rate depends on the lowest master clock rate and
the maximum decimation factor. I don't recall these values off the
top of my head, but I'll go double-check them. The maximum sampling
rate is 61.44 Msps.
--Neel Pandeya
On Wed, 28 Oct 2020 at 19:45, Barry Duggan via USRP-users
<usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>> wrote:
Using a B200mini, I have the following questions:
- If I have one antenna connected to the TRX port, is the receiver
blocked during a transmit?
- What are the maximum and minimum sample rates supported?
Thanks,
---
Barry Duggan KV4FV
https://github.com/duggabe
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