Jun. 10, 2024
Measurement & Analysis Instruments
Manfred Mornhinweg
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#411
Hi all,having been using both the NanoVNA and the TinySA for some time, I'm ever more in need of extending my measuring capabilities to 6GHz. Looking for suitable devices, I found mainly the LiteVNA, and the SA6 spectrum analizer.But the combination of these two is a bit heavy on the pocket... At my preferred source (AliExpress), the LiteVNA 62 is about $100, and the SA6 around $180, including shipping to my place.So I was wondering if there is a way to save some money. Here is my question: Is there a reasonable way to press the LiteVNA into a usable, even if basic, spectrum analyzer role?I saw the LiteVNA advertised as a spectrum analyzer on AliExpress. Of course a VNA isn't a spectrum analyzer... But is this simply false advertising by the AliExpress seller, or does the LiteVNA have some spectrum analysis capability built in?My requirements regarding spectrum analysis in the UHF range and beyond are mainly like these:- Checking spectral purity of 5.7GHz video transmitters;- Checking directional pattern of 5.7GHz antennas;- Comparing signal strengths of various cellphone companies in a given area, on frequencies ranging from 700 to MHz;- Pointing directional cellphone antennas for strongest signal, while hanging monkey-style on a tower.So I don't need precise measurement. But I do need to see relatively weak signals. If that's a problem, I can add a preamplifier using a MMIC.Can such spectral analysis be done with the LiteVNA and any tricks?The VNA functionality I need in the UHF and higher range is basically checking and tuning antennas, and perhaps some filters. True impedance measurement is a plus, but not essential. For antenna work, just basic SWR indication is good enough, but of course full VNA functionality is better.If the LiteVNA is not capable of providing the basic spectrum analysis functions I need, my next choice would be buying just the SA6 spectrum analyzer, and building a simple directional coupler to use it for antenna testing and tuning. In that case I can live without the LiteVNA. But this solution is almost twice as expensive as using a LiteVNA for everything, and I have found no real reviews of the SA6. I don't know if it is any good...Buying both devices feels like overkill, for my very occasional use, specially considering that I already have the older two devices for lower frequency work.Any suggestions are welcome!Manfred========================Visit my hobby homepage!========================
M. Lyakhovsky
#412
SVA 7 Inch Touch LCD 50KHz -4.4GHz
This device seems capable of doing both being a sa and vector analyzer
SVA 7 inch Touch LCD 50KHz ~4.4GHz Vector Network Analyzer HF VHF UHF Antenna Analyzer Upgrade of NanoVNA VNA
Does this device can do the same
toggle quoted message
Show quoted textOn Wed, Apr 20, at 7:04 PM Manfred Mornhinweg < manfred@... > wrote:
Hi all,
having been using both the NanoVNA and the TinySA for some time, I'm
ever more in need of extending my measuring capabilities to 6GHz.
Looking for suitable devices, I found mainly the LiteVNA, and the SA6
spectrum analizer.
But the combination of these two is a bit heavy on the pocket... At my
preferred source (AliExpress), the LiteVNA 62 is about $100, and the SA6
around $180, including shipping to my place.
So I was wondering if there is a way to save some money. Here is my
question: Is there a reasonable way to press the LiteVNA into a usable,
even if basic, spectrum analyzer role?
I saw the LiteVNA advertised as a spectrum analyzer on AliExpress. Of
course a VNA isn't a spectrum analyzer... But is this simply false
advertising by the AliExpress seller, or does the LiteVNA have some
spectrum analysis capability built in?
My requirements regarding spectrum analysis in the UHF range and beyond
are mainly like these:
- Checking spectral purity of 5.7GHz video transmitters;
- Checking directional pattern of 5.7GHz antennas;
- Comparing signal strengths of various cellphone companies in a given
area, on frequencies ranging from 700 to MHz;
- Pointing directional cellphone antennas for strongest signal, while
hanging monkey-style on a tower.
So I don't need precise measurement. But I do need to see relatively
weak signals. If that's a problem, I can add a preamplifier using a MMIC.
Can such spectral analysis be done with the LiteVNA and any tricks?
The VNA functionality I need in the UHF and higher range is basically
checking and tuning antennas, and perhaps some filters. True impedance
measurement is a plus, but not essential. For antenna work, just basic
SWR indication is good enough, but of course full VNA functionality is
better.
If the LiteVNA is not capable of providing the basic spectrum analysis
functions I need, my next choice would be buying just the SA6 spectrum
analyzer, and building a simple directional coupler to use it for
antenna testing and tuning. In that case I can live without the LiteVNA.
But this solution is almost twice as expensive as using a LiteVNA for
everything, and I have found no real reviews of the SA6. I don't know if
it is any good...
Buying both devices feels like overkill, for my very occasional use,
specially considering that I already have the older two devices for
lower frequency work.
Any suggestions are welcome!
Manfred
========================
Visit my hobby homepage!
http://ludens.cl
========================
Do have a Blessed Day
--
Manfred Mornhinweg
#413
Since the SVA only covers to 4.4GHz, it's not useful to me. One of my main application areas is in 5.7GHz video links.
Also it's about as expensive as the LiteVNA and the SA6 together!
And the description I see says it's a VNA. It doesn't mention SA functionality.
So, my question stands: Is there a way to force the LiteVNA into a crude SA role?
Manfred
toggle quoted message
Show quoted textSVA 7 Inch Touch LCD 50KHz -4.4GHz
This device seems capable of doing both being a sa and vector analyzer
SVA 7 inch Touch LCD 50KHz ~4.4GHz Vector Network Analyzer HF VHF UHF Antenna Analyzer Upgrade of NanoVNA VNA
Does this device can do the same
On Wed, Apr 20, at 7:04 PM Manfred Mornhinweg <manfred@... <mailto:manfred@...>> wrote:
Hi all,
having been using both the NanoVNA and the TinySA for some time, I'm
ever more in need of extending my measuring capabilities to 6GHz.
Looking for suitable devices, I found mainly the LiteVNA, and the SA6
spectrum analizer.
But the combination of these two is a bit heavy on the pocket... At my
preferred source (AliExpress), the LiteVNA 62 is about $100, and the
SA6
around $180, including shipping to my place.
So I was wondering if there is a way to save some money. Here is my
question: Is there a reasonable way to press the LiteVNA into a
usable,
even if basic, spectrum analyzer role?
I saw the LiteVNA advertised as a spectrum analyzer on AliExpress. Of
course a VNA isn't a spectrum analyzer... But is this simply false
advertising by the AliExpress seller, or does the LiteVNA have some
spectrum analysis capability built in?
My requirements regarding spectrum analysis in the UHF range and beyond
are mainly like these:
- Checking spectral purity of 5.7GHz video transmitters;
- Checking directional pattern of 5.7GHz antennas;
- Comparing signal strengths of various cellphone companies in a given
area, on frequencies ranging from 700 to MHz;
- Pointing directional cellphone antennas for strongest signal, while
hanging monkey-style on a tower.
So I don't need precise measurement. But I do need to see relatively
weak signals. If that's a problem, I can add a preamplifier using a
MMIC.
Can such spectral analysis be done with the LiteVNA and any tricks?
The VNA functionality I need in the UHF and higher range is basically
checking and tuning antennas, and perhaps some filters. True impedance
measurement is a plus, but not essential. For antenna work, just basic
SWR indication is good enough, but of course full VNA functionality is
better.
If the LiteVNA is not capable of providing the basic spectrum analysis
functions I need, my next choice would be buying just the SA6 spectrum
analyzer, and building a simple directional coupler to use it for
antenna testing and tuning. In that case I can live without the
LiteVNA.
But this solution is almost twice as expensive as using a LiteVNA for
everything, and I have found no real reviews of the SA6. I don't
know if
it is any good...
Buying both devices feels like overkill, for my very occasional use,
specially considering that I already have the older two devices for
lower frequency work.
Any suggestions are welcome!
Manfred
========================
Visit my hobby homepage!
http://ludens.cl
========================
--
Do have a Blessed Day
On -04-21 01:04, M. Lyakhovsky wrote:
--========================Visit my hobby homepage!========================
Adi Voh
#414
I find Lite64 and TinySA sold as bargain....
Have them both and some others and i am not a rich person but normal worker.
If You do business (i suppose if you are talking about video and data links) , i simply don't understand that mentioned instruments are expensive...
Take a look what is the cost of Keysight, Anritsu, R&S or Copper mountain stuff....
Have fun,
Adi
S55M
What is cheap and expensive is a strictly personal matter..
toggle quoted message
Show quoted textOn Thu, 21 Apr at 18:21, Manfred Mornhinweg < manfred@... > wrote:
Since the SVA only covers to 4.4GHz, it's not useful to me. One of
my main application areas is in 5.7GHz video links.
Also it's about as expensive as the LiteVNA and the SA6 together!
And the description I see says it's a VNA. It doesn't mention SA
functionality.
So, my question stands: Is there a way to force the LiteVNA into a crude
SA role?
Manfred
On -04-21 01:04, M. Lyakhovsky wrote:
> SVA 7 Inch Touch LCD 50KHz -4.4GHz
> This device seems capable of doing both being a sa and vector analyzer
>
>
> SVA 7 inch Touch LCD 50KHz ~4.4GHz Vector Network Analyzer HF VHF
> UHF Antenna Analyzer Upgrade of NanoVNA VNA
> Does this device can do the same
>
> On Wed, Apr 20, at 7:04 PM Manfred Mornhinweg <manfred@...
> <mailto:manfred@...>> wrote:
>
> Hi all,
>
> having been using both the NanoVNA and the TinySA for some time, I'm
> ever more in need of extending my measuring capabilities to 6GHz.
> Looking for suitable devices, I found mainly the LiteVNA, and the SA6
> spectrum analizer.
>
> But the combination of these two is a bit heavy on the pocket... At my
> preferred source (AliExpress), the LiteVNA 62 is about $100, and the
> SA6
> around $180, including shipping to my place.
>
> So I was wondering if there is a way to save some money. Here is my
> question: Is there a reasonable way to press the LiteVNA into a
> usable,
> even if basic, spectrum analyzer role?
>
> I saw the LiteVNA advertised as a spectrum analyzer on AliExpress. Of
> course a VNA isn't a spectrum analyzer... But is this simply false
> advertising by the AliExpress seller, or does the LiteVNA have some
> spectrum analysis capability built in?
>
> My requirements regarding spectrum analysis in the UHF range and beyond
> are mainly like these:
>
> - Checking spectral purity of 5.7GHz video transmitters;
> - Checking directional pattern of 5.7GHz antennas;
> - Comparing signal strengths of various cellphone companies in a given
> area, on frequencies ranging from 700 to MHz;
> - Pointing directional cellphone antennas for strongest signal, while
> hanging monkey-style on a tower.
>
> So I don't need precise measurement. But I do need to see relatively
> weak signals. If that's a problem, I can add a preamplifier using a
> MMIC.
>
> Can such spectral analysis be done with the LiteVNA and any tricks?
>
> The VNA functionality I need in the UHF and higher range is basically
> checking and tuning antennas, and perhaps some filters. True impedance
> measurement is a plus, but not essential. For antenna work, just basic
> SWR indication is good enough, but of course full VNA functionality is
> better.
>
> If the LiteVNA is not capable of providing the basic spectrum analysis
> functions I need, my next choice would be buying just the SA6 spectrum
> analyzer, and building a simple directional coupler to use it for
> antenna testing and tuning. In that case I can live without the
> LiteVNA.
> But this solution is almost twice as expensive as using a LiteVNA for
> everything, and I have found no real reviews of the SA6. I don't
> know if
> it is any good...
>
> Buying both devices feels like overkill, for my very occasional use,
> specially considering that I already have the older two devices for
> lower frequency work.
>
> Any suggestions are welcome!
>
> Manfred
>
> ========================
> Visit my hobby homepage!
> http://ludens.cl
> ========================
>
>
>
>
>
> --
> Do have a Blessed Day
>
--
========================
Visit my hobby homepage!
http://ludens.cl
========================
Manfred Mornhinweg
If you are looking for more details, kindly visit china 20mhz function generator.
#416
What is cheap and expensive is a strictly personal matter..Yes, absolutely! And like Einstein said, it's all relative! ;-)
If You do business (i suppose if you are talking about video and data links) , i simply don't understand that mentioned instruments are expensive...No, I'm not doing any business anymore. It's strictly for hobby use.
Take a look what is the cost of Keysight, Anritsu, R&S or Copper mountain stuff....Oh yes... Many years ago, when I still worked a job, I used a Hewlett Packard spectrum analyzer, that worked up to 22GHz. That one cost as much as several cars. But of course I didn't pay for it. My employer did.
Have fun,I try to! ;-)
Adi,Yes, absolutely! And like Einstein said, it's all relative! ;-)No, I'm not doing any business anymore. It's strictly for hobby use.Oh yes... Many years ago, when I still worked a job, I used a Hewlett Packard spectrum analyzer, that worked up to 22GHz. That one cost as much as several cars. But of course I didn't pay for it. My employer did.Now, retired, playing with electronics, I have to pay for my toys, and since I'm a terrible cheapskate, I love low cost instruments!I try to! ;-)ManfredXQ6FOD========================Visit my hobby homepage!========================
M. Lyakhovsky
#417
new rom
so is there a way to make lite vna do that
toggle quoted message
Show quoted textOn Thu, Apr 21, at 3:32 PM Manfred Mornhinweg < manfred@... > wrote:
Adi,
> What is cheap and expensive is a strictly personal matter..
Yes, absolutely! And like Einstein said, it's all relative! ;-)
> If You do business (i suppose if you are talking about video and data
> links) , i simply don't understand that mentioned instruments are
> expensive...
No, I'm not doing any business anymore. It's strictly for hobby use.
> Take a look what is the cost of Keysight, Anritsu, R&S or Copper
> mountain stuff....
Oh yes... Many years ago, when I still worked a job, I used a Hewlett
Packard spectrum analyzer, that worked up to 22GHz. That one cost as
much as several cars. But of course I didn't pay for it. My employer did.
Now, retired, playing with electronics, I have to pay for my toys, and
since I'm a terrible cheapskate, I love low cost instruments!
> Have fun,
I try to! ;-)
Manfred
XQ6FOD
========================
Visit my hobby homepage!
http://ludens.cl
========================
Do have a Blessed Day
--
Manfred Mornhinweg
#420
The LiteVNA and nanoVNA will have similar performance as spectrum analyzerThanks, that's interesting.
See this for the nanoVNA:https://erikkaashoek.blogspot.com//09/nanovna-usable-as-spectrum-analyzer.html
Erik,Thanks, that's interesting.So, if the LiteVNA really achieves a comparable performance in its higher range, it looks like I could just take a suitable LNA with high gain (maybe 40dB), and connect it between an antenna and the LiteVNA, and at least see the on-air signals I want to see.I don't need much performance as a SA. Just enough to see what signals are there, and compare their strengths, also see which one gets stronger and which one drops off when I rotate the antenna.The double hump with 10kHz separation, shown by the nanoVNA, is obviously due to the fact that the nanoVNA's signal input sections work as direct-conversion receivers, which have this double-signal response. The local oscillator is placed 5kHz away from the desired frequency, so one response results from the correct input frequency and another comes from any signal 10kHz to one side. In VNA use this is not a problem, because there is a single stimulus signal, always on the correct frequency.I assume (but don't know) that the LiteVNA might use a higher beat frequency, so the two responses might be farther apart. But the signals I need to see in the UHF and microwave range are all wide, typically 5-6MHz wide, so I don't expect this to be a problem.I would also expect harmonic mixing to be a problem. If I look at signals around MHz, for example, I would fully expect signals around MHz to appear visible at a lower strength. Real spectrum analyzers avoid that mainly by using a local oscillator frequency higher than the SA's range (up-converting superheterodyne receivers).Well, I ordered my LiteVNA two days ago. At least it should be a big help in its main function, as a VNA, to check and align antennas and filters such as low/high cellular band diplexers, and I see now two ways to get crude spectral analysis, enough for me needs, without having to buy a dedicated SA. One is using the LiteVNA with the mentioned high gain LNA (two MMICs cascaded), to get sufficient sensitivity to see signals coming from an antenna. The other is building a crude downconverter, using the LiteVNA in CW mode as a local oscillator to about 5GHz, a diode mixer, a 1GHz high pass filter before the mixer, and a 1GHz low pass filter after it, then feed the signal into the TinySA. And add a single-stage LNA in front of the mixer, if necessary. That should be enough to see spans up to 720MHz.I will report back when I have results.Manfred========================Visit my hobby homepage!========================
Erik Kaashoek
#422
A big problem with using a VNA as a spectrum analyzer is the limited bandwidth of the largest resolution filter.
For an SA this often up to 1 MHz enabling to cover 6 GHz in steps. But if the VNA is using maximum 10kHz is will be 100 times slower to cover the whole range.
An SA will ensure the scanning steps are such that all frequencies will be covered. An VNA will not do that for you. You have to calculate yourself how many steps to take for the wanted span.
With the max (?) steps of the LiteVNA and a filter of 10kHz (?) wide you can not scan wider than 10. MHz without risking not to see the signal you are looking for.
Manfred Mornhinweg
#423
A big problem with using a VNA as a spectrum analyzer is the limited bandwidth of the largest resolution filter.Yes, that's indeed a valid point. That's why I mentioned the kind of signals I need to see: Very broadband ones! When looking for a narrow signal, over a wide frequency range, using a narrow filter is like looking for a needle in the haystack. One could skip over it without ever seeing it. But the signals I need to see are several MHz wide, and have relatively flat energy distribution over their width. So it should be possible to see them well enough even when scanning in steps many times as wide as the filter bandwidth.
With the max (?) steps of the LiteVNA and a filter of 10kHz (?) wide you can not scan wider than 10. MHz without risking not to see the signal you are looking for.
Erik,Yes, that's indeed a valid point. That's why I mentioned the kind of signals I need to see: Very broadband ones! When looking for a narrow signal, over a wide frequency range, using a narrow filter is like looking for a needle in the haystack. One could skip over it without ever seeing it. But the signals I need to see are several MHz wide, and have relatively flat energy distribution over their width. So it should be possible to see them well enough even when scanning in steps many times as wide as the filter bandwidth.But signal strength could become a problem. Looking at a 5MHz wide signal with a 10kHz wide filter will capture only a tiny part of the total signal power, far less than if using a wider bandwidth. But then, the noise is also lower, due to the lower bandwidth...I suspect that the actual bandwidth is far less than 10kHz. After all, a VNA only needs to detect and measure the exact frequency on which the stimulus signal is! The only reason to need a non-zero bandwidth is to get fast enough response. The required bandwidth is related to the number of points scanned per second.My LiteVNA is still in China, waiting to get on the plane. Apparently COVID is slowing down logistics in China. When I get it, I will see if I get any usable results forcing it to do what it's not made for... And of course, I will also use it for its intended purpose!Resolution bandwidth is one of the big reasons that deters me from buying an SA6 for my spectrum analyzing needs: According to published specs, it has a fixed RBW of 200kHz! That's quite limiting. I think that for a real SA, selectable RBW over a wide enough range is a very important feature.Manfred========================Visit my hobby homepage!========================
Manfred Mornhinweg
#434
A follow up on this matter:
My LiteVNA arrived yesterday. I have already spent quite a bit of time playing with it. It works pretty well! So far the only problems I have seen is that the SMA connectors and cables are sensitive to flexing and motion, no matter how firmly I tighten the connector nuts, and this requires some care in the measurements, and using as few connectors as possible; And also that one time I ran into what must be a firmware bug: The unit became unresponsive while trying to calibrate, and I had to turn it off and on.
I have already measured the behavior of several antennas in the range of 700 to MHz, in terms of SWR bandwidth, directivity pattern and polarization, using the test antenna on port 1 and a reference dipole on port 2, also I have measured some components into frequencies where even small SMD capacitors become inductors and other weird stuff happens, and then I tried to use it as a basic spectrum analyzer in the 5.7GHz band, to see drone video signals, with good results! Of course it's not as good for that task as a real spectrum analyzer, but it's plenty good enough to detect a signal, measure its frequency, its relative strength, and move around the LiteVNA with the dipole antenna to check the directivy pattern and polarization of the drone's transmitting antenna, also to check that the video transmitter isn't putting out any huge spurious signals.
So I'm quite happy with this device! It has given me eyes in the frequency range above about MHz, which I lacked before, and without breaking the bank.
As mildly exotic silicon has become cheaper and the ingenuity of hardware hackers has been unleashed upon it, it&#;s inevitable that some once-unattainably expensive instruments will appear as cheap modules from China. The LTDZ spectrum analyser on the bench today covers 35 MHz to 4.4 GHz, and has a USB interface and tracking source. It has been available from all the usual outlets for a while now either as a bare PCB or in a metal box about the size of a pack of cards.
We&#;ve already taken a look at the $50 VNA, and this time it&#;s the turn of the $30 spectrum analyser, in the form of a little device that I succumbed to while browsing Banggood.
I ordered one, along with an attenuator and RF bridge for SWR measurements, and after the usual wait for postage my anonymous grey package arrived and it was time to give it a look and consider its usefulness. It&#;s a design derived from one published in Germany&#;s Funkamateur (&#;amateur radio&#;) magazine early in the last decade, and unscrewing the end plate to slide out the board from its extruded enclosure we can see what makes it tick.
Its operation is surprisingly simple, in effect a very wideband radio receiver and signal source that can sequentially check signal levels across its range under the control of a microcomputer. On the board is an STM32F103 microcontroller that drives a pair of ADF PLL frequency synthesisers for tracking and receive local oscillator respectively, an IAM- receive mixer, and an AD logarithmic amplifier to measure the received level. It&#;s reported as having a receive bandwidth in the region of 150 kHz, but I lack the instrumentation to measure that. On the rear edge of the board is a micro-USB socket, a couple of LEDs, and a &#;Key&#; switch to enable the tracking oscillator, and on the front are a pair of SMA sockets for RF input and output.
Hardware-wise all seems in order, but it&#;s a different tale on the software side. The history is related by [VMA&#;s Satellite Blog], and is a salutary tale of how cheaply cloned hardware can have unfortunate consequences. The WinNWT and LinNWT software used by the original Funkamateur design came from [Andreas Lindenau, DL4JAL], and was available from his website. The Funkamateur design was improved upon by other radio amateurs around the world, including a Chinese amateur [BG7TBL] who produced the design I have on my bench. When this was taken up by manufacturers and sold in volume, [DL4JAL] found himself fielding unsustainable levels of support queries. He thus withdrew the original NWT4 software from his website.
If you buy one of these you will almost certainly be offered a download from the vendor. In my case I couldn&#;t find a Linux version, and tried the NWT software which worked with my spectrum analyser despite claims to the contrary. To respect his wishes we&#;ll not put a link to his website here, but if you use his software of whatever version on one of these units we would like to request that you do not trouble him for support. Happily the [DL4JAL] software isn&#;t the only game in town, with both VMA Simple Spectrum Analyser and SNA Sharp being readily available alternatives. They are however both Windows-only, and the former requires a paid activation key for long-term use.
Once I had my device plugged in and detected by the software, it was time to calibrate it. This process simply generates a record of the device&#;s performance while directly reading its tracking generator, allowing the software to create a flat baseline. Calibration involves running a scan first with tracking source connected to the input through an attenuator, then directly. Once this has been done it is then possible to read a flat line across the frequency range without any test devices connected. To my shame, it took me a while to realise that pressing the &#;Key&#; button was necessary to enable the tracking generator.
So, I have a spectrum analyser here on my bench, what next? Of course the first thing was to plug in an antenna and take a look at the off-air spectrum. I could home in on the FM band and see all the local stations that you&#;d find in a small British town, and I could see the TV multiplex transmissions, the home WiFi, and my mobile when I made a call. Having a new toy sends you scurrying around the house in search of radio sources, so I can confirm that variously a UHF remote, a DECT handset, and my Baofeng handheld radio all produce satisfying spikes on the graph.
It&#;s all very well to have a spectrum analyser to look at the pretty spikes, but it&#;s time to do something useful. The most obvious thing to try would be to characterise an antenna using the RF bridge, but sadly with most of my radio stuff in storage I don&#;t have a suitably narrow-band antenna to measure.
Instead I can check the spectral purity of my Baofeng transceiver, and for that all I need is the attenuator. The procedure is simple enough, connect the Baofeng&#;s antenna output through the attenuator to the spectrum analyser input, and take a spectrum reading. My back-of-the-envelope reckoning tells me that with the transmit power on the 100 mW &#;low&#; setting, the 20dB attenuator should be enough to reduce the level so as not to harm the analyser, and its input resistor should be capable of taking 100 mW for a short time. Setting it up in this way and pressing the transmit button, I could instantly see why there is some concern about the filtering on these cheaper radios. It has quite a few spurious spikes in the space between the 435 MHz fundamental and the first harmonic, then particularly strong subsequent harmonics. You get what you pay for in a transmitter.
So for $30, I seem to have picked up a useful little instrument that&#;s more than a toy and that can do some useful RF tasks on my bench. The $30 price tag makes itself felt though in that it has nowhere near the sensitivity and selectivity of its more expensive brethren, and its 35 MHz lower limit is too high for investigating noise emissions. Meanwhile the software has some availability issues over which we sympathise with its author, and we can&#;t help wishing that it had an open-source option available. For $30, it was worth it, but for much more I&#;d have to ask myself whether I would think the same. Perhaps for the lower frequencies in particular, a TinySA might be a better purchase.
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