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erberes 12/06/2020
Shipping is super fast as usual. Packaging is OK, but plastic could not protect the paper box (which is nice, but not very practical). As I have an older NanoVNA-F I can compare H4 with it. H4: Electrically it's better without hesitation. It has no trouble to keep everything below -60dB till 900MHz, and -50dB till almost 1.5GHz. This is really impressive. It's lighter due to plastic case (I regard this as a positive thing). LCD size is a bit smaller than F, but as there is no scale it looks almost the same. LCD visibility (especially from SMA side) is slightly worse than F. Touch reliability is slightly worse than F. Pushable rotating knob is still nothing to write home about but it seems to work. So far I could not locate a new SW version (I mean binary as I'm not keen compiling it myself). In addition the menu cheat sheet contains a DFU menu that is not found on the actual menu of the SW... So it's unclear to me how firmware update supposed to be done if it's necessary. In overall it's light and electrically so far the best package (it's a very good value). I look forward seeing the V2 variant with a similar size display.
NanoVNA-H4 50KHz~1.5GHz VNA HF VHF UHF UV 4-inch LCD Vector Network Analyzer
US$63.99 US$99.99
6
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erberes 25/01/2022
It's better than the NanoVNAv2 (3GHz) in every possible way, however it's good only about till 5GHz and that means that it does not unfortunately reach the 5.8GHz ISM band for S11 measurement (S21 works although it gets quite noisy there; for this in reality 4 1/2 stars if that was possible). The similar v1 (that goes till around 1.5GHz) required soldering SD card socket and crystal (for the clock if you cared) and the v2 was missing both, so this variant is better in that respect. It has a nice display and has SD card support (for me 32G newer one did not work, only 2G older one) but care is needed as it's possible to miss with the SD card the socket and it means that you have to disassemble the box to get it out. The noise floor is pretty good around 2.4GHz (tested with 60 and 65dB attenuation) and it has no trouble to show the S11 dip for such antenna. The biggest miss is that it's not suitable for testing 5.8GHz antennas. I've tested it with the firmware that I've received. As the firmware is in heavy development, newer ones can perhaps improve this a bit. For the battery you have to set the battery offset as it's likely to show incorrect charging status without it. It's goes also almost without saying that calibration for all setups is a must before any measurement (as for any VNA even professional ones).
Original Hugen 50kHz-6.3GHz LiteVNA 2.8"/3.95" Display Vector Network Analyzer HF VHF UHF Antenna
US$159.99
8
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erberes 17/11/2020
Shipping was super fast and packaging excellent (the original UNI-T one). It's heftier than I thought based on the pictures (though I've expected it to be not too small due to the 26650 battery) but it seems robust as well. The supplied USB-C cable is surprisingly long (that I like). Also not mentioned but a 16GB microSD card is included as well so it's ready to use. The brief manual is good quality. After switching on (3s long press but it's better to wait till UNI-T logo pops up) there is about a 15-20s boot time. The pictures are nice and there is low and high gain mode. I like it.
UNI-T UNi690B 256*192 Pixel Infrared Thermal Imager -15~550°C Industrial Thermal Imaging Camera Handheld USB Infrared Thermometer
US$319.99 US$483.99
8
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erberes 10/09/2020
Shipping was super fast (1 week due to EU shipping) and packaging excellent. The microscope is as described and truly excellent, well worth its price (despite that it's not cheap). The working distance with the supplied 0.5X lens is great. The documentation is nothing to rave about as it includes every possible variant so it's just easier to figure out how to assemble the whole thing. You must pay attention to it though; if you feel that the picture is not great double check if everything is in place/adjusted. The stand could have some minor improvement. There could be more holes for the bottom of the boom. It's at the middle of the longer edge currently and the boom and the microscope is so big that you have to work at the corner (see picture). If there was a hole at the middle of the shorter edge (or maybe even the corner like in the supplied mat, though it risks that it may fell over if wrongly oriented) one could work in the middle of the stand/pad. This is the only weakness of the whole setup that I've found. Highly recommended from me.
3.5~90X Zoom Magnification Stereo Microscope 16MP Camera Microscope For Industrial PCB Repair Sturdy All-metal Pillar Stand Powerful 56-LED Ring Light
US$375.99 US$532.99
4
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erberes 24/01/2022
It's an excellent headphone set and can be fully used not only via bluetooth but also with the supplied audio cable. The supplied micro USB cable is 0.5m (I have plenty of longer ones), the audio cable is 1.25m (just the right length). Although the headphone built in microphone indeed cannot be used in "plugged in" mode the audio cable has microphone so microphone works also when bluetooth is not used (this is confusing in the description; see both ends of the cable in the picture). I even like the microphone of the audio cable better as it produces a louder sound and it can be moved closer to mouth. With bluetooth you absolutely must have a high version as with 4.x there is a noticeable delay in the sound (not an issue for just audio listening but when audio and video is not in sync it's quite noticeable). The sound quality is excellent as expected with such large coil. For me who has a bigger than average head it's a bit tight for longer use but still I think it's an excellent piece of headphone that can be recommended.
Nokia E1200 bluetooth Wireless Headphones Stereo Sound Over-Head Gaming Headset With Microphone for Laptop PC Computer Phone
US$59.99 US$119.99
3
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erberes 21/09/2018
It's the in the bottom on my picture, smaller than the adapter like PSU (same power). Top is the 24W variant. It can be crammed to very tight spaces.
AC-DC 220V To 12V1A Isolation Switch Power Module 12W Switching Power Supply
US$5.99 US$11.99
1
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erberes 15/06/2022
Shipping was super fast due to EU warehouse. Arrived in an extra paper box (beyond the original one) that had some sign of wear but luckily power station was intact and brand new. This is a very good value PS so manufacturer had to make some compromise and it's that it's either in input mode (so can be charged) or in output mode (battery provides power). When charger is plugged in it restarts in charging (IN) mode and even the leds are switched off. The charger adapter can become also very warm beyond 62 ℃ in a 21 ℃ room during a longer charging. Based on the received manual the PS is built on 60 2.6Ah 3.6V cells. It has 2 DC outputs (but only one cigar-lighter socket adapter supplied), 4 USBs (one of that is type C) and 2 AC sockets that I is excellent for this smaller PS. When switched on without any load roughly 4.6W power consumption is indicated (with a huge fluctuation) and with AC switched on it jumps to 14W (my preference would be a bit smaller). AC output is pure sine, checked using a 60W bulb and DSO+High Voltage probe. There is some is some 24kHz 2.5V RMS (probably switching) noise in the output though that probably causes nothing. All in all this as an excellent value PS and look forward for an even bigger one that can supply some power while charged (pass through charging supported).
ORICO PA500-2A4U 156000mAh 561Wh 500W Portable Power Station Rechargeable Backup Lithium Battery With Type-C / 3*USB / 2*AC Outlet For Car For Laptop For Macbook For iPhone 13 Pro
US$861.34 US$847.99
0
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erberes@diegomontefusco Withthe new DiSlord firmwares (I use 1.2 currently) it's pretty usable even at 5.8GHz (tested with Lumenier AXII DUO) so in my view yes it's suitable for that, but it can depend also your expectations. Note: Some RF know-how is however required about calibration an interpreting what you see though, so it may require checking some online tutorials.

erberes 25/01/2022
It's better than the NanoVNAv2 (3GHz) in every possible way, however it's good only about till 5GHz and that means that it does not unfortunately reach the 5.8GHz ISM band for S11 measurement (S21 works although it gets quite noisy there; for this in reality 4 1/2 stars if that was possible). The similar v1 (that goes till around 1.5GHz) required soldering SD card socket and crystal (for the clock if you cared) and the v2 was missing both, so this variant is better in that respect. It has a nice display and has SD card support (for me 32G newer one did not work, only 2G older one) but care is needed as it's possible to miss with the SD card the socket and it means that you have to disassemble the box to get it out. The noise floor is pretty good around 2.4GHz (tested with 60 and 65dB attenuation) and it has no trouble to show the S11 dip for such antenna. The biggest miss is that it's not suitable for testing 5.8GHz antennas. I've tested it with the firmware that I've received. As the firmware is in heavy development, newer ones can perhaps improve this a bit. For the battery you have to set the battery offset as it's likely to show incorrect charging status without it. It's goes also almost without saying that calibration for all setups is a must before any measurement (as for any VNA even professional ones).
Original Hugen 50kHz-6.3GHz LiteVNA 2.8"/3.95" Display Vector Network Analyzer HF VHF UHF Antenna
US$159.99
8
Comentários (7)
erberes 03/11/2021
Shipping was OK, thanks Banggood. I've bought this cheap lamp so I don't need to baby it like the more expensive ones that I have. Thus its price (was discounted when I've bought it) has heavily influenced the rating that I gave. I did not expect the battery to be 5000mAh (although a good branded 26650 can match that but it also costs more than this complete set) but I did not expect it to be 2000mAh only either (charged with a good charger from 3.2V to 4.2V). Yes, the claimed five thousands mAh is only two thousands. Also it's not too bright in the highest mode (most of my 18650 lamps are brighter) and the light has a purple tint. Otherwise it's a complete set and zooming is reasonably tight, so if you don't want to spend too much it works.
USB Charger Zoom Flashlight 26650 Battery 18650 Battery Conversion Set AAA battery Sonversion Set
US$22.99 US$29.99
3
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Comentários (1)
erberes 26/04/2022
A good value mic, so I've bought some spares as well.
BlitzWolf CM1 Mini 3.5MM Omnidirectional Lavalier Cardioid Microphone HiFi Sound Noise Reduction Mic for YouTuBe Live Broadcasting SLR Camera Recording DJI OSMO Action Sports
US$14.94 US$15.99
0
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erberes 13/08/2021
Bangood shipping was excellent as usual (fast with reasonable packaging). Thanks. Assembly was easy although I've found no manual (the double sided tape has to be placed under the PCB). The PCB seems to be excellent manufacturing quality. The plastic box is OK, although tightening of the SMA connector requires that extra attention is paid to it. Fan (not supplied) is not required till 100mW and that is plenty in case of ExpressLRS due to its excellent modulation and the most energy dedicated per bits due to the smart channel utilization. Building the firmware was flawless, just like WiFi update. The Lua script based control is also excellent. This system is highly recommended, for new builds it's probably the best choice but for older systems it's also a strong contender to switch them.
Happymodel ES24TX 2.4GHz ExpressLRS ELRS Long Range Low Latency High Re-flashed Micro TX Module for RC Drone
US$52.99 US$58.99
2
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erberes 26/03/2022
Excellent quality for the price but adapter is a must if used with DSLR/MILC for video.
BlitzWolf CM1 Mini 3.5MM Omnidirectional Lavalier Cardioid Microphone HiFi Sound Noise Reduction Mic for YouTuBe Live Broadcasting SLR Camera Recording DJI OSMO Action Sports
US$14.94 US$15.99
0
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UNI-T UNi690B 256*192 Pixel Infrared Thermal Imager -15~550°C Industrial Thermal Imaging Camera Handheld USB Infrared Thermometer
US$319.99 US$483.99

Q: What is the closest focusing distance?

perguntado por erberes sobre 2020-11-03 09:21:12

xman12 I can't answer this because I do not get the device until now. I have to wait another week, I fear. Non posso rispondere perché non ho ricevuto il dispositivo fino ad ora. Devo aspettare un'altra settimana, temo. Sorry this is translated with google-translator :-)

2021-12-09 12:25:33 Útil (1)
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respostas (4)
erberes 02/03/2022
Super fast shipping due to EU warehouse. As I was not looking for the highest possible quality I've pleasantly surprised what I've got that is excellent. There is nothing to complain, especially for the price.
BlitzWolf® BW-CM2 Condenser Microphone USB Microphone Audio Dynamic System Kit Cantilever Bracket Anti-spray Net Set Sound Recording Vocal Microphone
US$69.29 US$89.99
0
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erberes 11/11/2021
Fast shipping due to EU warehouse, thanks Banggood. Excellent quality, meeting or exceeding its spec. It has the nice round input dividers and highest output range/lowest noise in the family (so superb dynamic range). It has come with the newer probes (that's been introduced with DP20003) so Micsig is not cheaping out even here. Highly recommended if its input voltage fits to your use.
Micsig DP10007 Oscilloscope High Voltage Differential Probe 100MHz+70V Oscilloscope Probe Kit
US$195.18 US$202.99
1
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erberes 24/11/2021
It's a good value set but unfortunately no upper frequency limit or insertion loss is specified. I've checked the N to SMA adaptor with a spectrum analyzer till 6GHz (the easiest to check and it should have also the highest limit). First normalized with good quality adaptor and then swapped out only the adaptor to the received one. Insertion loss stays within 0.2-0.3dB till ~1.5GHz (that is good), gradually increases to ~0.5dB till 3GHz and further increases almost to 1dB around 6GHz (so it's not the best for high frequency). In the picture the N to SMA adaptor from this set is on the right.
RFN01 SMA RF Adapter 20 Kit N Type to SMA BNC to SMA TNC to SMA RF Connectors Adapter with Box
US$57.74 US$59.99
2
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erberes 14/04/2021
Shipping was super fast due to EU warehouse. Thanks Banggood. Product matches description (GOKU HM600 VTX, Caddx Ant camera etc). Documentation is decent (the PDF file that can be downloaded), but there are some gaps, so it requires that you know how to search on the net. This is a pretty good setup that arrives almost ready to fly (requires antenna plug in, bind and if you prefer some Betaflight setup like GPS rescue) but VTX gets very hot too soon. This happens even if output power is reduced to minimum via BF CLI with "set vtx_power = 1" and then "save". (You can similarly change band and channel "set vtx_band = x" and "set vtx_channel = y" and "save" if you prefer to keep your settings also for next start.) I don't think it's normal that in a ~22 Celsius room the RF chip on the Goku VTX gets so hot (with 100mW output power) that its temperature exceeds 121 Celsius (see infra cam picture) while setup is made. This can destroy the chip very quickly. Also when closely inspected, a capacitor seems to be hand soldered after the rest (flux residue is not removed), that points also to some issue that is fixed as an afterthought. In short: I fear that VTX (RF chip) won't last long since on a warm day as cruising speed most probably cannot cool the chip enough and also it can get hot while you're waiting for GPS lock. I look forward some Flywoo feedback on this (or even a replacement if the VTX is faulty). Apart from this I think it's an excellent quad especially if you wish to stay below the 250g limit (works even with 850mAh battery) with reasonable flight time.
Flywoo Explorer LR4 4S Micro Long Range FPV Racing RC Drone Ultralight Quad w/ Caddx Ant 600mw VTX GOKU 16X16 Micro Stack
US$218.49 US$231.99
13
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erberes 23/06/2021
Fast shipping, nice original packaging. It's a good cam (among the top of its type) and certainly exceeds signal quality need of most (if not all) analogue channels. This edition has great configuration flexibility. I wouldn't mind though that a plug is supplied that can short the 2 control pins that is required to switch between the serial and control board based control (while powered on).
RunCam Phoenix 2 Camera 1/2 CMOS 1000TVL f2.0 155 Degree Super WDR Mini FPV Camera Joshua Edition for RC Racing Drone
US$39.99 US$45.59
1
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erberes 09/09/2021
Super fast shipping, reasonable packaging. Thanks Banggood. I've bought this antenna as a replacement for what's supplied with Happymodel ExpressLRS TX as it provides a bit more gain/directivity and best radiation frequency is expected to be consistent for each copy due to different construction. What was strange with this antenna is that assembly required removing white plastic of the connector of the antenna (can be done with nail, see picture). Also be careful with rotation as that plug at the bottom of the antenna holds very strongly, unlike the blue heat shrink that holds the wire and the connector together. This could be made stronger.
2 Pcs BETAFPV ExpressLRS ELRS 2.4GHz 868/915MHz 5.5dbi High Gain Moxon Antenna for RC Radio and TX Module
US$25.40 US$29.99
2
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erberes 15/06/2021
Super fast shipping (EU warehouse), excellent packaging (original one). A small form factor switching mode PSU with lots of power and with excellent functions. The user interface is very intuitive, the supplied manual is hardly ever needed (maybe switching off the annoying beep with long pressing OCP is the only exception). If it's not heavily loaded it's also completely silent (fan is stopped). Some of the good functions: 1) It has hard on/off switch (so no active electronics is powered when switched off). 2) It has output switch (so when powered on it does not immediately outputs voltage, you can adjust first without unplugging). 3) It can work in both CV and CC mode (in which mode it drops voltage till current is decreased to the limit). 4) It has also OCP mode (in which case unlike in CC mode it switches off the output instead of reducing voltage). 5) It has good resolution and 2 memories. 6) It can be SW controlled (USB stick received with SW, I have not tried it). 7) It has USB charging output. 8) Cables (both power and USB) are reasonable length and quality. Being a switching mode PSU it has big spikes in the output though. The RMS value meets the spec, but as we know it tells just a small part of the story. Luckily it seems that the core of this is shared among several other products so slowing down the MOSFETs works also here (2x~33Ohm+2x~47nF, there is video about that if you search). With 27Ohm+47nF I could reduce the RMS from 12.7 to 3.7mV and Pk-Pk from 281.1 to 83mV in a noisy environment so PSU is not the only noise contributor (as there is no free lunch probably it has also slowed down the load response that I don't care). Another issue is that the rotary encoders could be better de-bounced from SW. In short: This is a very good feature packed and powerful PSU that has all relevant functions for a reasonable price and if needed can be modded to be even better (it won't be still a linear PSU though if you look for very low noise output).
Topshak Professional 220V/110V 0-30V 0-10A 300W Programmable DC Power Supply Display Adjustable Regulated Power Supply
US$136.28 US$192.99
7
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