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List: usrp-users
Subject: [USRP-users] Re: The signal received by B205mini is unstable
From: luteo <xdcple () 163 ! com>
Date: 2022-10-28 5:50:27
Message-ID: 65ec45c0.5569.1841d2445f7.Coremail.xdcple () 163 ! com
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I agree with you that this testing method cannot be applied.
The reason for using this test method is that when the B205mini and B210 use the same \
antenna, the B205mini signal is unstable and will be subject to irregular signal loss \
due to the tightness of the antenna SMA interface, so this extreme visual method is \
used to find problems.
From the current test results, no matter how the B210 shakes or tightens the SMA \
connector, even if it is slightly contacted by one of my probes, there will be no \
signal loss problem. However, this problem will occur when the other two B205mini are \
tested.
At 2022-10-27 20:16:39, "Marcus D. Leech" <patchvonbraun@gmail.com> wrote:
On 27/10/2022 00:37, luteo wrote:
Thank you very much for your reply!
I have two B205minis in my hand. Both of them have the phenomenon described \
previously, but the same antenna does not have this phenomenon on the B210.
Refer to the two videos of B205mini operating under GQRX ("B205 DuPont line. \
mp4"&"B205 DuPont line Acrylic. mp4") , I use the probe to insert it into the SMA \
interface, and the signal will be lost after changing different directions. My \
understanding is that the inner hole of the SMA interface should be the same as the \
metal probe on any surface. However, in the actual test, the two B205minis all show \
that the signal will be lost at the same position, which is also my confusion.
If you can, you can also test it in my way.
I just watched your videos. That's not the way SMA connectors are intended to be \
used. The internet construction of different SMA connectors will behave somewhat \
differently under these circumstances (with a random piece of wire jammed into the \
SMA socket). Furthermore, the internal spring socket can get permanently deformed \
by doing that. Please don't. Ettus/NI cannot guarantee performance if you aren't \
using the SMA connector the way SMA connectors were intended to be used.
At 2022-10-26 20:15:51, "Marcus D. Leech" <patchvonbraun@gmail.com> wrote:
On 2022-10-26 01:37, luteo wrote:
When testing the B205mini, we found that the SMA connector was tightened to the most \
tight, but there may be no signal or the signal is weak.
Of course not always. Sometimes it is better to loosen the SMA connector a little.
In short, the reception effect requires repeated adjustment of the sma connector. \
Even after the sma is tightened, applying an external force on the plug position may \
change the quality of the received signal.
There is no similar problem on other types of USRP boards. It is determined that it \
is not an antenna problem.
We used B210 and B205mini for comparison. See the attachment for video results. \
¡°B205-antenna.mp4¡± & ¡°B210-antenna.mp4¡±
We used another B205mini for comparison. The phenomenon is the same. See the \
attachment for video results. ¡°B205-DuPont line.mp4¡± & ¡°B205-DuPont \
line-Acrylic.mp4¡±
We are not sure whether this phenomenon is caused by the absence of a shielded \
enclosure. But we don't think it will have such a big impact.
I want to ask if there is any way to solve this problem.
I haven't seen this problem with the several B205-mini that I have.
Check your cables.
Make sure that you aren't *over* tightening the SMA connector and breaking it at the \
shield.
Make sure that your source is well matched to 50 ohms. Impedance mismatches \
(significant ones can cause high shield currents, making the performance \
inconsistent, and even subject to placement of the input cable.
´ÓÍøÒ×163ÓÊÏä·¢À´µÄ³¬´ó¸½¼þ
B205-antenna.mp4 (3.61M, 2022Äê11Ô 25ÈÕ 13:35 µ½ÆÚ)
ÔÚÏßÔ¤ÀÀ | Ï ÔØ
B205-DuPont line.mp4 (2.75M, 2022Äê11Ô 25ÈÕ 13:35 µ½ÆÚ)
ÔÚÏßÔ¤ÀÀ | Ï ÔØ
B205-DuPont line-Acrylic.mp4 (17.49M, 2022Äê11Ô 25ÈÕ 13:35 µ½ÆÚ)
ÔÚÏßÔ¤ÀÀ | Ï ÔØ
B210-antenna.mp4 (4.56M, 2022Äê11Ô 25ÈÕ 13:35 µ½ÆÚ)
ÔÚÏßÔ¤ÀÀ | Ï ÔØ
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[Attachment #5 (text/html)]
<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><p \
style="margin: 0;"><br></p><p style="margin: 0px; word-break: break-word \
!important;">I agree with you that this testing method cannot be applied.</p><p \
style="margin: 0px; word-break: break-word !important;"><br style="word-break: \
break-word !important;"></p><p style="margin: 0px; word-break: break-word \
!important;">The reason for using this test method is that when the B205mini and B210 \
use the same antenna, the B205mini signal is unstable and will be subject to \
irregular signal loss due to the tightness of the antenna SMA interface, so this \
extreme visual method is used to find problems.</p><p style="margin: 0px; word-break: \
break-word !important;"><br style="word-break: break-word !important;"></p><p \
style="margin: 0px; word-break: break-word !important;">From the current test \
results, no matter how the B210 shakes or tightens the SMA connector, even if it is \
slightly contacted by one of my probes, there will be no signal loss problem. \
However, this problem will occur when the other two B205mini are tested.</p><p \
style="margin: 0;"><br></p><p style="margin: 0;"><br></p><p style="margin: \
0;"><br></p><div style="position:relative;zoom:1"></div><div \
id="divNeteaseMailCard"></div><p style="margin: 0;"><br></p><p>At 2022-10-27 \
20:16:39, "Marcus D. Leech" <patchvonbraun@gmail.com> wrote:</p><blockquote \
id="isReplyContent" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: \
#ccc 1px solid">
<div class="moz-cite-prefix">On 27/10/2022 00:37, luteo wrote:<br>
</div>
<blockquote type="cite" \
cite="mid:e08d7d7.38aa.18417bb0aba.Coremail.xdcple@163.com">
<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial">
<p style="margin: 0;">Thank you very much for your reply!</p>
<p style="margin: 0;"><br>
</p>
<p style="margin: 0;">I have two B205minis in my hand. Both of
them have the phenomenon described previously, but the same
antenna does not have this phenomenon on the B210.</p>
<p style="margin: 0;"><br>
</p>
<p style="margin: 0;">Refer to the two videos of B205mini
operating under GQRX ("B205 DuPont line. mp4"&"B205 DuPont
line Acrylic. mp4") , I use the probe to insert it into the
SMA interface, and the signal will be lost after changing
different directions. My understanding is that the inner hole
of the SMA interface should be the same as the metal probe on
any surface. However, in the actual test, the two B205minis
all show that the signal will be lost at the same position,
which is also my confusion.</p>
<p style="margin: 0;"><br>
</p>
<p style="margin: 0;">If you can, you can also test it in my
way.</p>
<p style="margin: 0;"><br>
</p>
<p style="margin: 0;"><br>
</p>
</div>
</blockquote>
I just watched your videos. That's not the way SMA connectors \
are intended to be used. The internet construction of<br>
different SMA connectors will behave somewhat differently under
these circumstances (with a random piece of wire<br>
jammed into the SMA socket). Furthermore, the internal spring
socket can get permanently deformed by doing that.<br>
Please don't. Ettus/NI cannot guarantee performance if \
you aren't using the SMA connector the way SMA connectors<br>
were intended to be used.<br>
<br>
<br>
<blockquote type="cite" \
cite="mid:e08d7d7.38aa.18417bb0aba.Coremail.xdcple@163.com">
<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial">
<p style="margin: 0;"><br>
</p>
<p style="margin: 0;"><br>
</p>
<p style="margin: 0;"><br>
</p>
<p>At 2022-10-26 20:15:51, "Marcus D. Leech"
<a class="moz-txt-link-rfc2396E" \
href="mailto:patchvonbraun@gmail.com"><patchvonbraun@gmail.com></a> wrote:</p> \
<blockquote id="isReplyContent" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; \
BORDER-LEFT: #ccc 1px solid">
<div class="moz-cite-prefix">On 2022-10-26 01:37, luteo wrote:<br>
</div>
<blockquote type="cite" \
cite="mid:665f49e9.5052.18412cbb604.Coremail.xdcple@163.com">
<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial">
<div style="line-height: 1.7;">
<p style="margin: 0px;">When testing the B205mini, we
found that the SMA connector was tightened to the most
tight, but there may be no signal or the signal is
weak.</p>
<p style="margin: 0px;"><br>
</p>
<p style="margin: 0px;">Of course not always. Sometimes
it is better to loosen the SMA connector a little.</p>
<p style="margin: 0px;"><br>
</p>
<p style="margin: 0px;">In short, the reception effect
requires repeated adjustment of the sma connector.
Even after the sma is tightened, applying an external
force on the plug position may change the quality of
the received signal.</p>
<p style="margin: 0px;"><br>
</p>
<p style="margin: 0px;">There is no similar problem on
other types of USRP boards. It is determined that it
is not an antenna problem.</p>
<p style="margin: 0px;"><br>
</p>
<p style="margin: 0px;">We used B210 and B205mini for
comparison. See the attachment for video results. ¡°<span \
style="background-color: rgb(227, 234, 244); color: rgb(102, 102, 102); font-family: \
"Microsoft Yahei", verdana; font-size: 12px; white-space:
nowrap;">B205-antenna.mp4</span>¡± & ¡°<span \
style="background-color: rgb(227, 234, 244); color: rgb(102, 102, 102); font-family: \
"Microsoft Yahei", verdana; font-size: 12px; white-space:
nowrap;">B210-antenna.mp4</span>¡±</p>
<p style="margin: 0px;"><br>
</p>
<p style="margin: 0px;">We used another B205mini for
comparison. The phenomenon is the same. See the
attachment for video results. ¡°<span style="background-color: \
rgb(227, 234, 244); color: rgb(102, 102, 102); font-family: "Microsoft
Yahei", verdana; font-size: 12px; white-space:
nowrap;">B205-DuPont line.mp4</span>¡± & ¡°<span \
style="background-color: rgb(227, 234, 244); color: rgb(102, 102, 102); font-family: \
"Microsoft Yahei", verdana; font-size: 12px; white-space:
nowrap;">B205-DuPont line-Acrylic.mp4</span>¡±</p>
<p style="margin: 0px;"><br>
</p>
<p style="margin: 0px;">We are not sure whether this
phenomenon is caused by the absence of a shielded
enclosure. But we don't think it will have such a big
impact.</p>
<p style="margin: 0px;"><br>
</p>
<p style="margin: 0px;">I want to ask if there is any
way to solve this problem.</p>
</div>
</div>
</blockquote>
I haven't seen this problem with the several B205-mini that I
have.<br>
<br>
Check your cables.<br>
<br>
Make sure that you aren't *over* tightening the SMA connector
and breaking it at the shield.<br>
<br>
Make sure that your source is well matched to 50 ohms.
Impedance mismatches (significant ones can cause high shield<br>
currents, making the performance inconsistent, and even
subject to placement of the input cable.<br>
<br>
<br>
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rtJaqIl00803xa-rfjWzJBwQaU-iS4kQWfkEF12fA&title=The%20signal%20received%20by%20B205mini%20is%20unstable" \
moz-do-not-send="true">ÔÚÏßÔ¤ÀÀ</a> | <a \
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