FUNCube-1 & FUNCube-2 Decoding Update

In the film “Willy Wonka and the Chocolate Factory” there is a scene where the lucky children (and parents) enter the “Land of Candy” where everything is edible and they run around grabbing a taste of everything. I am beginning to know how they felt.

Amateur radio has so many different things to try and over the last year I have found myself jumping around having a dabble at new things. Doing this and time being scarce has inevitably impacted the HAB payload and other Arduino projects. I have also neglected some of my previous satellite monitoring activities.

I had been regularly decoding the FUNCube-1 (AO-73) telemetry and uploading packets to the data warehouse (see earlier posts). To do this I had been using a discone in the loft and a FUNCube Dongle on the ageing main computer in the house.

This computer was on 24/7 but I couldn’t leave the FUNCube dashboard running continually as the processor load would cause the noisy fans to kick in, besides for most of the day there wasn’t a receivable pass. So I would just start up the dashboard when needed which meant remotely logging in from work. Due to an increasingly busy work load I would often forget or be unable to start it up and have got out of the habit. I therefore missed many opportunities to climb up the uploading ranking chart (it is really for the science honest!)

Of late there have been a large number of new satellites launched including the UKube-1 and the QB50 satellites which have modules and transponders as part of the FUNCube project.

Catching up with news after the holiday to Skye I noticed the announcement that an enhanced version of the FUNCube decoder dashboard has been released promising improved performance. The dashboard will also capture and upload (but not display) the FUNCube-2 telemetry transmitted from UKube-1

Looking at the FC1 upload ranking list I saw I had dropped down significantly and decided it wasn’t acceptable!

As part of my antenna upgrade I have put up the X-50 dual-band collinear on the top of the pole feed with nice low loss RG213. This is currently connected to the FUNCube Dongle Pro+ dongle on the shack laptop, with the latest dashboard software installed.

It has been running 24/7 for the majority of the last week and has captured close to 2000 telemetry packets from FC1 a significant performance increase compared to my earlier set up, and I have now surpassed the 10,000 packet milestone (currently 11,626). I have also uploaded over 500 telemetry messages received from the FUNCube-2 on UKube-1. I have actually received more but a fault in the warehouse meant a lot were rejected due to a incorrect data field.

The FC2 subsystem on UKUBE-1 may not be enabled on every pass while the satellite is commissioned and the FUNCube team will be releasing an updated dashboard shortly for when it is operating full time.

At present both satellites are passing one after the other, with UKube-1 gradually gaining. So as FC1 goes LOS (loss of signal) UKube-1 rises elsewhere for AOS (acquisition of signal)

On one pass yesterday I thought I would capture some screen shots and show how I’ve got the dashboard set up for both payloads.

As already mentioned the existing dashboard can be used to receive both FUNCube-1 and 2, if using the FUNCube Dongle Pro+ by setting the central frequency to 145.905MHz and adjusting the upper and lower filter curtains both payloads can be received.

On the Orbitron prediction software you can see FC1  is overhead, with UKube-1 over the North pole.

The reception window on the dashboard is limited by moving the curtains. I have the lower one set at 145.906MHz just enough to filter out the centre SDR spike,  the upper one is at 145.945MHz. The telemetry signal on FC1 is at 145.935MHz but due to the Doppler effect the received frequency will vary above and below this nominal value, 10kHz either size is sufficient to compensate.

If you were just interested in one satellite you would move the lower curtain to around 10kHz below the nominal download frequency. However since UKube-1 is on 145.918MHz the lower curtain is set to below this again to compensate for the Doppler shift.

The resulting receive window will allow both to be received. However this does risks problems should QRM occur in the pass band as the decoder can lock on to this, luckily the improved dashboard software discriminates between the signal and noise much better than previous versions.

The dashboard below is receiving the FUNCube-1 signal (click to enlarge)

The data is being uploaded and checking the real time display on the warehouse confirms this (my old callsign M6GTG) however you might not show up every single time and the FUNCube-1 Flight Model tab must be chosen as seen below.

As the pass finishes and UKube-1/FC2 comes overhead and due to the omni-directional X-50 I don’t need to change anything.

The dashboard soon detects the new signal at the lower frequency and begins decoding.

The received payload ID is shown in the bottom right of the dashboard

Again the upload can be confirmed by viewing the real time data page on the warehouse by selecting the UKube-1 FC2 Payload tab. It should be noted that it seems FC2 is sometime sending spurious data elements in the telemetry which the warehouse is rejecting so some uploads may not be displayed.

It is really that simple.

Did I make ICube-1’s first signal report?

Just like a excited child at the moment! Why you ask? 

Well this morning saw the launch of the numerous satellites from the Dnepr rocket including Funcube-1, and this morning saw the first passes over the UK. Like many others I eagerly sat in front of my computer awaiting the chance to decode the telemetry. However I was doing it remotely using a VNC connection as I was in work…

Sure enough at 10:21 the pass started and a nice strong signal appeared on the waterfall and the FUNCube dashboard sprang to life. I managed 29 packets on the first pass!

The upload ranking at the FUNcube data warehouse

However I noticed another CW signal further up the spectrum which seemed to be on the edge of the FUNCube transponder allocation (145.950MHz) I went to twitter and asked if FUNCube-1 was transmitting a CW beacon? Peter 2E0SQL thought it might be another satellite.

At start of earlier FUNCube-1 pass, what looks like CW on transponder downlink frequency? #funcube
— Andrew Garratt (@nerdsville) November 21, 2013

I had captured the pass as an IQ file, and set about trying to decode the CW. I had several attempt using fl-digi remotely but chasing a fast moving doppler on a laggy remote connection wasn’t good but I seemed to repeatedly get ***ISTAN.

On the next pass the same thing happened, this time I got the word CUBESAT several times..

The signal had the same doppler shift as FUNCube-1 so was from the same launch constellation and a quick check and I spotted ICube-1 the first cubesat launched by Institute of Space Technology in Pakistan.. which was listed as broadcasting on 145.947MHz using AFSK.

It must be.. ***ISTAN… CUBESAT…. So I sent them a message on their Facebook page and they confirmed that at this stage of the mission they were indeed supposedly broadcasting a CW beacon and what I decoded was part of the message!

Khurram project manager of ICube-1 said “Thanx Andrew … your message was a great relief for us”

and on their facebook page 

First Signal has been received from ICUBE-1 in UK … Alhamdulillah the ICUBE-1 mission is successful … Congrats everyone. Satellite will pass over IST around 9:30 pm today

So it seems lowly M6GTG may have made the first signal report confirming Pakistan’s first successful cubesat deployment!

I am grinning madly at the moment!

November Satellite Madness!

I haven’t done any satellite tracking of late, however this month sees 37 satellites being launched carrying amateur radio payloads. Yes 37!!

Yesterday three cubesats Pico Dragon, ArduSat-1 and ArduSat-2 were jettisoned from the ISS using the JEM Small Satellite Orbital Deployer (J-SSOD), a fourth TechEdSat-3p was released this morning.

Today also saw the launch of Minotaur-1 from NASA’s Wallops Island containing 29 satellites, 12 of which are amateur payloads, they have all been deployed.

Tomorrow sees the Yasny Dnepr launch carrying 31 satellites, of which 21 use amateur radio allocations, including FUNCube-1.

Get along to the FUNCube website for further information and to download the handbook and the dashboard telemetry application, after all this is what those FUNCube dongles were designed for!

For up to date information check out the Amsat-UK website, and here is a handy link for a full list of payloads and frequencies

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The joys of RTL-SDR and Taxi MDT Decoding

I have owned and used radio scanners for many years, and loved them as my posts before December 2011 will testify.

In that month I became the proud possessor of a FUNCube Dongle Plus and discovered the joys of software defined radio, since then I purchased a FUNCube Dongle Pro+ and extended my SDR adventures in to the realms of HF and I have several of the insanely cheap RTL2832 based dongles.

As much as loved my scanners there was a major flaw with them, which has been brought into sharp focus now that I have used SDR.

No matter how fast or as sensitive as the scanner is are you are still playing a game of chance. You are limited by the frequency steps, demodulation modes and scanning rate of the receiver and you could zip through the band all day and still miss those elusive signals.

SDR and the waterfall display is a revolution, you can view a portion of the spectrum in real time and actually see the signals, they may be short lived bursts of data and voice, or continuous data transmissions.

The RTL-SDR dongles excel in this respect with their wide sampling rate you can view up to 2MHz of the spectrum at once, the following images show typical waterfalls captured this morning using one of my RTL-SDR dongles.

The first one, shows the cluster of data channels (was the old Vodaphone Paknet system) around 164.2 – 164.4 MHz, a trunking control channel and various data bursts, which are mostly Taxi Mobile Data Terminal (MDT) transmissions.

A little lower down the spectrum and another trunking control channel, a speech conversation, more data bursts and a faint digital channel.

Further up the spectrum into the UHF, a cluster of data transmissions.

Simply moving the cursor on the display and you can hear the transmission, if necessary change the demodulation type, widen or narrow the filter bandwidth, save the frequency. If you capture the IQ file you can then replay it endlessly tweaking and refining until you extract the information you want.

During the weekend I was experimenting and noticed there was lots of data bursts in the 163-168MHz range, I confess that I already knew what most of them were as I have experimented before with a scanner (with a discriminator tap) and Ian Wraith’s Java based Taxi MDT decoder. I decided to reinvestigate them using the RTL-SDR as the receiver.

While many taxi companies still use voice transmissions, many have adopted automated data terminal systems, where the dispatcher sends information about jobs to terminals in the cars, the drivers then can accept jobs, get information and send information back to the dispatcher.

Ian’s decoder which requires the Java runtime environment decodes systems that use the same physical layer as MPT1327 i.e 1200 Hz and 1800 Hz tones transmitted at 1200 bps. The two main systems used in the UK, are the Autocab and Auriga. The Taxi MDT Decoder currenly decodes the Autocab, but the coding for the Auriga system is still an unknown, so just outputs the raw data.

More information about Taxi MDT Decoder can be found here I confess to having one slight niggle with it, often I couldn’t get it to accept sound from the selected input. A work around I found was to first open the Audacity sound editor which I had installed and select the input and start a recording, then opening the decoder seems to make it work!

Ian has also written the excellent DMRDecoder which allows analysis of the DMR digital mode which is becoming more widespread. I intend to post some details soon about decoding digital modes, keep watching.

I created a video showing the Taxi MDT Decoder in action, the quality is pretty dire but you can get the idea, I identify the Auriga as being encrypted, it might be but as nobody on the team knows the protocol yet!

WSPR using a FUNCube Dongle PRO+

For sometime I have been using my FUNCube Dongle Pro+ SDR as an HF receiver station for WSPR, so. I thought it was about time I posted something.

By its very nature radio propagation isn’t totally predictable so someone transmitting can never know exactly where their signal will be received. There is whole science behind radio propagation prediction and amateur radio operators are always on the look out for openings or skip conditions for DX communications. To aid operators a number of propagation beacons exist, usually operating in CW mode transmitting their identification (call sign and location). Some of them use frequency shift keying and some transmit signals in digital modulation modes.

While invaluable operators have to actively receive and monitor these signals and what they really want to know is how their signal is getting out to the rest of the world. This is where the WSPR system comes into its own. The WSPR system uses a protocol which probes these potential propagation paths using low-power QRP transmissions.

WSPR (pronounced “whisper”) stands for “Weak Signal Propagation Reporter” and is a computer program that enables amateur radio stations to participate in a world-wide network of low power propagation beacons. The station transmits beacon signals and receives signals from other stations operating in the same amateur band. These stations then upload ‘spots’ that they receive in real time to a central website enabling operators to find out where and how strongly they were received, and can view the propagation paths on a map.

It is also possible to operate a receive only station uploading ‘spots’ to the same website, all that is required is a receiver capable of receiving single side band transmissions and feeding the resultant audio into the WSPR program where it is processed. The WSPR program was written by Joe Taylor, K1JT.

These “whisper” signals are often barely audible but their presence can be detected by the WSPR program using signal processing. The WSPR signal uses frequency shift keying (FSK) with a very small shift and a very slow data rate. The signals bandwidth occupied is only about 6 Hz so many stations can operate within the 200Hz WSPR window without interference. WSPR transmissions are encoded to carry a station’s callsign, grid locator, and transmitter power in dBm. The program can decode signals with S/N as low as -28 dB in a 2500 Hz bandwidth.

Each transmission lasts for just under two minutes, and starts at the beginning of each even-numbered minute. Therefore it is vitally important that transmitters and receivers are synchronised, so one of the fundamental pre-requisites of success with WSPR is an accurately-set computer clock. This is achieved by using internet or GPS time synchronisation methods.

Setting Up

This diagram shows the set up I am using at the moment. I have a long-wire antenna connected to the FUNCube Dongle Pro+. I am using SDRSharp (SDR#) to operate the FCDP+ and the resulting audio output is then used as the input into the WSPR program.

I am using SDR# but any suitable SDR program could be used, I have used SDR-Radio and HDSDR but I have found the SDR# program uses less resources on my ageing PC.

Routing the sound output from one program to be the input into another can be problematic and depends on the soundcard and its driver, you might be lucky and have a ‘stereo-mix’ or ‘what-u-hear’ option to use the main sound card output as a recording input, or alternatively you will need to use something like virtual audio cable VAC.

Since the WSPR signal is very narrow band it is desirable that your receiver is accurately calibrated. Most SDR program that support the FUNCube Dongle PRO+ allow a correction setting so that the tuned signal is at the correct frequency, the use of beacons, repeaters, time signals or broadcast stations is an excellent method to set this correction if required.

You will need to download the WSPR program from the current stable version is WSPR-2.11. The installation is straightforward and when you start the program a window will appear that looks like a command prompt, don’t close this window, it will give important debug messages if there problems. Then the main console window will open along with a window where you set the station parameters.

Don’t worry about the Callsign and Grid locator at the moment, the first thing to do is select the correct audio in source, the rest can be ignored as it relates to a transmitter and I am describing how to set up a receive only station.

Firstly slide the Tx fraction (%) to zero, since you won’t be transmitting and make sure the upload spots is unchecked at the moment, then select the appropriate band you wish to receive. Then set the appropriate dial frequencies in your SDR receiver program, this is shown in the window and your SDR program will need to operate in USB, with a bandwidth of 2500Hz.

The current WSPR dial frequencies are (MHz)
0.136, 0.4742, 1.8366, 3.5926, 5.2872, 7.0386, 10.1387, 14.0956, 18.1046, 21.0946, 24.9246, 28.1246, 50.293, 70.091,144.489

I suggest you turn off any AGC and any filtering in the receiver, uncheck the idle box in WSPR and then wait for the next ‘even’ minute at which point the program should show receiving, alter the sound level so the Rx Noise is ideally around 0dB, but it will work between -10dB and +10dB.

When the two minute interval is over a segment will appear in the waterfall in the top panel and the program will decode any WSPR transmissions received, you will see them as lines in the waterfall as the above image shows. Any successful decodes will appear in the bottom panel.

Once you have got it working, the next thing is to register on the website for a SWL callsign, mine is G-SWL10 you will also need to know your grid-locator, you can find this easily using

Once registered then putting the data into the station parameters and checking the upload spots will send your spots to the website database, where you can view your spots in the database and on a map, the map at the top shows my spots on one day this week on 20m, getting stations from Australia, the Far East and the US as well as Europe.

Some important things to note are ensure you computer clock is accurately set, if it is wrong you will be out of sync and decodes won’t happen and ensure you are tuned to the correct frequency as you have set the WSPR program otherwise spots will be reported for the wrong band.

It is a fascinating activity and even as just a receiver you are offering a valuable service to amateur operators.

Receiving LES1 a satellite built in 1965!

A few weeks ago I read a news article about the miraculous reactivation of LES1, this satellite was built by the Massachusetts Institute of Technology and launched back in 1965. The satellite failed to reach its intended orbit owing to a wiring error and has been drifting out of control ever since, it was abandoned in 1967 as a piece of space junk but has seemingly begun transmitting again after 46 years.

Back in December Phil Williams G3YPQ from Cornwall noticed a peculiar signal and after some research determined it was LES1. The odd signal is probably caused by the satellite tumbling end over end every 4 seconds as the solar panels become shadowed by the engine. ‘This gives the signal a particularly ghostly sound as the voltage from the solar panels fluctuates’ Phil says. It is likely that the on board batteries have now disintegrated and some other component failure has caused the transmitter on 237Mhz, to start up when its in sunlight.

Eager to see if I could receive this ancient satellite I dug out an unused DAB 3-element antenna and mounted it on a tripod and successfully monitored two passes this afternoon.

I used my FUNCube Dongle (original version) and SDR-Radio V1.5 and this was the analysis of the resulting recorded IQ file for the pass that started around 17:30pm. You can clearly see the satellite signal as it undergoes Doppler shift and the four second regular frequency shift caused by the tumbling.

At its most northerly latitude the satellite orbit passes over North Africa, but due to its height has a longer orbit period than most other satellites and is receivable over much of Europe. How long it keeps transmitting is a mystery.

STRaND-1 – First attempts

As I posted earlier this week a number of satellites were launched into orbit on board the PSLV-C20 rocket, this included the first UK CubeSat, STRaND-1.

STRaND stands for Surrey Training, Research and Nanosatellite Demonstration and STRaND-1 is hopefully the first of a long line of STRaND nanosatellites from the academic researchers at the Surrey Space Centre (SSC) based at the University of Surrey in conjuction with Surrey Satellite Technologies Limited (SSTL).

The innovative STRaND-1 CubeSat was built and tested in just three months and is designed to demonstrate the feasibility of using cheap smartphone electronics to control a spacecraft, since it contains a Google Nexus One Android phone as part of its experimental payload. STRaND-1 carries an amateur radio AX.25 packet radio downlink on 437.568 MHz using 9k6 bps FSK modulated data HDLC frame, NRZI encoding.

Official orbital elements (TLEs) have already been produced so the current position and prediction passes can be calculated and available on

At the time of this post STRaND-1 is passing over in UK in the early morning (South-North) and early evening (North-South), both times are not particularly convenient on weekdays due to work commitments, but last night I did manage to have my first proper attempt to capture some of the telemetry.

My ‘ground station’ consisted of a FUNCube Dongle and SDR-Radio (V1.5) with doppler correction enabled. It was connected to a small Moonraker ZL-Special 7-element antenna mounted on a small tripod with my Android phone running the Satellite-AR application mounted behind it. The Satellite-AR assists in pointing it in the correct direction as the pictures below demonstrate.

This slightly blury picture shows the satellite cluster containing STRaND-1 displayed in the Satellite-AR app, by moving the antenna on the tripod I attempt to keep this in the centre of the screen hopefully maximising the signal.

As you can see on the waterfall I did manage to receive the telemetry signal. It isn’t a continuous signal, data is broadcast in short bursts with long gaps between the ‘frames’

The next stage was to take this and using a number of software packages, including a TNC modem emulator and extract the data. The process is described here by Jan van Gils (PE0SAT) I have had a few attempts with my captured signals, unfortunately with little success I think due to the signal to noise ratio being too low.

This morning I was up nice and early to capture the pass at approximately 05:50, this time I used my FUNCube Dongle Pro Plus on another laptop, but for some reason the received signal was very poor. In desperation I took the antenna off the tripod and held it horizontally rather than vertically and did manage to get a signal, unfortunately it was at the end of the pass and STRaND-1 was heading over the horizon.

Still I am happy with my initial efforts.

ARISS school contact reception despite the interference

Yesterday morning (10:57 UTC) saw an ARISS School Contact with participants at Ecole Les Muriers, Saint-Maur-Des-Fossés, France.

This was a nice opportunity to listen in since the position of the ground station at the school meant the UK could listen in to the majority (if not all) of the downlink. Usually when it is further east in Europe (Germany/Poland etc) you get the initial calling and the start of the contact but the ISS goes out of range before the session ends.

So I set up my FUNCube Dongle PRO PLUS connected to the discone in the loft and the new SDR-Radio V2 Preview software. I had to start the recording remotely as I was in work, but have played back the IQ file and made a video showing the decoding.

As you can see/hear I appear to get the full contact and the questions were (source)

1. What is the temperature outside the ISS?
2. What does the Earth look like from the ISS?
3. What does the Moon look like from the ISS?
4. Have you already passed through an asteroid belt?
5. Are you able to go outside the station, into the space?
6. What is your speed? Can you feel it?
7. How do you sleep? Do you have the same sleep pattern than on the earth?
8. Do the crew members sleep one after the other, or do you sleep all at the same time?
9. How do you know if it is morning or night on board?
10.Do you do any sports and physical activities? Do you lose weight?
11. Do you shave every day? If so, how?
12. Do you see any space debris? Can you see evidence of pollution of the earth?
13. What are your hobbies on the ISS after a day of work?
14. Are you happy to come back home at the end of your mission?
15. What is your current mission?
16. Why did you choose to become an astronaut?
17. How do you cook food? What is a typical meal in the ISS?

I was lucky to receive it given the interference monster was back! It does manage to get in on the act a few times but thankfully doesn’t stop the show completely.

Over the last few months I’ve been suffering from increasing interference on the VHF/UHF and HF bands. Some of which I know about, the router I have puts out quite a few spikes on VHF but something local to me is putting out huge amounts of QRM.

I know it isn’t internally generated as it disappears when I remove the antenna. I have gone around and powered off all the potential culprits in the house and discovered a switch-mode power supply for an external USB hard drive was throwing out some HF noise as was a digital photo frame.

I’ve suffered with interference on and off since getting back into the hobby back in 2010 and appreciate it is something I have to live with but it is quite annoying at times. I suspect the interference might be one of those power-line networking devices, but if anyone has any idea I would welcome a comment!

Getting ready to monitor Quadrantid meteor show with my FUNCube Dongle

Tonight and tomorrow see the Quadrantid Meteor Shower (article on Telegraph website) Nasa scientists are predicting the morning skies are this week set to be filled with hundreds of shooting stars in the year’s first meteor shower.

Recently I have been reading up on amateur Radio Astronomy, one easy project is the detection of meteors using radio scattering.

On the British Astronomical Association, Radio Astronomy Group website there is an interesting project (a  PDF download) which demonstrates how to use a FUNCube Dongle to detect reflection of the Graves Space Surveillance Radar signal from ionisation trails.

The Graves French space surveillance transmitter located near Dijon, operating on a frequency of 143.050MHz the FCD was capable of receiving the weak backscatter echoes from meteors, indeed I experimented last year and with a simple antenna  picked up many squeaks and whistles from the normal ‘background’ meteor activity.

So I’ve set up my equipment again and will be doing some recording the hope of a barrage of strange noises!

Dongles, Dongles Everywhere!

It is dongle overload at the moment at Châteaux Nerdsville,

Firstly I purchased a new (and improved) RTL-based USB DAB/DVB stick.

Like the FUNCube Dongle Pro it seems the manufacturers of these cheap USB receivers have been hit by the shortage of the Elonics E4000 tuner chips. Up to now the E4000 has been the most desirable tuner to have in the devices as it’s the most capable, giving usable coverage from around 60MHz to 1.7GHz. However Elonics has been liquidated and the intellectual property is up for sale and supply and/or stocks of the E4000 have dwindled. Manufacturers have therefore resorted to different tuners.

One of the alternative devices is the Rafael Micro R820T which has support in Linux drivers so the source code was ported to the rtl-sdr project. Several postings I saw hinted that the device could preform down to around 24MHz (which I have yet to confirm) and was more sensitive, so when I saw a dongle for the grand total of £11 including postage I brought one. It is a Newsky dongle and looks exactly like my previous one.

In the meantime the newly designed FUNCube Dongle Pro PLUS has been in production and lucky customers have been slowly receiving theirs. With over a thousand people in front of me on the waiting list I wasn’t expecting one before the new year, so imagine my surprise when I received an email on Thursday inviting me to buy one, which of course I did without hesitation, and it arrived on Friday! So over the weekend I had chance to toy with it and the RTL-USB device.

The first issue I had was my favoured SDR program SDR-Radio doesn’t yet support the new FCDP+, but support is being worked on for the V2 release. There is support using a new EXT-IO dll for HDSDR but I was keen to reacquaint myself with SDR#.

The SDR# (SDR Sharp) project which has become a popular application and I have used it occasionally with the original FCD. The latest download comes complete with all the necessary drivers and libraries to use with the FCD/FCDP+ and RTL-USB devices, indeed it was quite painless and everything seemed to work straight out the box.

The most obvious new feature of the FCDP+ and one of the main reasons I got one is the extended frequency range. It works down in the LW/MW and HF bands and that is what I have spent most of the weekend doing, picking up a lot of SSB/CW Amateur contest traffic as well as other CB operators. The VHF/UHF preformance seems much better and less prone to noise that the original FCD, but have yet to use it in anger.

Here is a recordings made using the FCDP+ down in 20 meter band

and one made showing reception in the 10 meter band of what appears to be SSB transmissions from America.

The RTL-USB device unfortunately had less use over the weekend playing second fiddle to the much more expensive FCDP+, however I did have some attempts at using it and first impressions are that it is more sensitive than the older version, but that really isn’t much of recommendation as the older device was quite deaf, however it does look quite promising.

This is a recording made of some SSB TX by the RTL-USB in the 70cm band. (The recording that was posted earlier was recorded using the FCD)