Monday, November 20, 2023

Radio Garden review: Web platfrom and app

 

I enjoy various forms of radio listening: traditional radio for local stations, SDR radio for testing and measuring, kSDR for remote listening to global stations, and Radio Garden, the helpful app/website for streaming stations worldwide.

Today, I will write about my renewed interest in Radio Garden and review the app after downloading it on my smartphone.

I discovered Radio Garden roughly four years ago when it first gained popularity. Let's take a look at their mission statement and values.

The website for this platform is http://radio.garden. Here is the information found under the settings tab:


Radio Garden invites you to tune into thousands of live radio stations across the globe.

By bringing distant voices close, radio connects people and places. From its very beginning, radio signals have crossed borders. Radio makers and listeners have imagined both connecting with distant cultures, as well as re-connecting with people from ‘home’ from thousands of miles away.

Radio Garden is based in Amsterdam, the Netherlands. Our dedicated team is hard at work tending to the garden on a daily basis. Planting seeds for the future and keeping the weeds at bay.

Team

As head gardener of Radio Garden, Jonathan Puckey is involved in design, development and everything in between.

Abdulwadûd Louws takes care of the steady stream of station submissions and makes sure our collection of over forty-thousand live stations is neat and tidy.

Barbara Hennequin works with us as art director, illustrator, product designer and writer.

THE Garden

In 2018 we launched mobile apps for both iOS and Android platforms. In 2019 we introduced the ability for our users to search for their favorite stations and places.

In order to better facilitate day to day use, we launched a redesign of Radio Garden in 2020 in collaboration with digital product designer Timo Hofmeijer. Rebuilt from the ground up as a mobile first experience, it laid the groundwork for future developments.

In 2021 we introduced a new section called Browse, a first step to opening up the collection of stations for more curated experiences. One of the first features is curated playlists, where we invite specialists from across the globe to tell stories through selections of stations.

Origins

Radio Garden started out in 2016 as an exhibition project commissioned by the Netherlands Institute for Sound and Vision in the context of the research project Transnational Radio Encounters. It was created, designed and developed by Studio Puckey & Moniker.

After taking care of the project in the following years, Jonathan Puckey turned Radio Garden into a small independent company in 2019.


Fist lets consider about the application. They offer several premium features such as an equalizer, sleep timer, and ad remover for $3.09 per month or $30.99 annually. Operating in the free mode I had to occasionally close and restart the app to get rid of these very annoying adverts waiting for around 20 seconds.  Sometimes this ad blocks the program without the ability to return back to the program . The new rental system format provides developers with a constant revenue, good for enhancing the program, but for most users, they will revert back to the standard  free version . This blocking is very important to be corrected as soon as possible. Notice that happens in both my Xiaomi models (5 years old 5A and the 12C )

To return to the program operation  on their web page, as far as I recall, Garden used TuneIn or other stream audio aggregators to gather all available stations and visualize them in a semi 3D globe.  . I hope that today's user input has helped inn getting one step out of  aggregators

The interface is simple and concise .  You see a globe with thousands of markers indicating station locations here called as ‘seeds;  . It's good to know that the size of the markers corresponds to the number of stations in a particular place or city.

 

 

Above is a full page screenshot map of the Caribbean displaying the area of radio station coverage inside the circle. You listen to the place in the centre of the circle. Once set, the left tab displays all local stations in the area  plus the nearby places . To secure listening to your desired station, use the lock feature in the right bottom . Otherwise, while browsing the map, the station may change to the next city or seed station.

Worth to notice , there are many station heard with a very bad audio. This is the mistake from the station transmitting with usually low bit rate or poor audio , this is not from the interface!

Zooming can be adjusted either by using the mouse roller or the -+ zoom buttons below the lock.

To save a station, click the small heart in the top-right corner of the player. Additionally, you may share the station or visit their site from the “…” menu. 

 


 

There's an intriguing Browse button that leads you to stations with captivating themes, such as playlists featuring rare music genres from all over the world. Some examples include The Rare Tongues, Time Travels, and Independent Sounds. There are currently eight different playlists available, and hopefully, more to be added later.

By simply using the next or previous button, you can journey to various locations on the planet. For example, one of my playlists jumped from Brazil to Lagos and then to Tanzania. I listened to rather exotic music in my ears, even though I am quite accustomed to listening to these via shortwaves. Right now, I am listening to samba, then changing to some extraordinary tribal sounds from Tanzania. Afterward, I switch to some traditional Greek or Bulgarian music, then later hear some Hindic music from Afghanistan. Finally, I end with gamelan from Indonesia. Interesting music. This is a hypothetical scenario.  All the world's music is now available on your smartphone or desktop! I would appreciate it if more user-made playlists were added to this tab. 

It is worth noting that the application can play music in the background and even when the mobile's screen is turned off. Based on my testing, the playback can last for an extended periods or  bypass the Android system's hibernation.  

This application or web site is currently the quintessential program for listening to music from all over the world. Thousands of options for music, sports, and talk radio are available, reminiscent of the past when shortwave radios were used to tune in to remote stations from all over the planet . It is unclear if there are any competitors, but Radio Garden certainly delivers excellent performance!

I rate it 9/10 - a very good program that could still be improved with new playlists or even those granted by the users. I would appreciate the addition of an "undo" option to allow for returning to the previous station or even a few stations back. And finally correct the bug with the  adverts blocking the application!

 


Saturday, June 4, 2022

Deshibo GA450 test and flaws


Long after looking on a decent loop antenna for external receptions with the PL330 and while looking on Youtube i found this interesting loop. it is intended to be used in my now primary house on the outskirts of the Mt Olympus . The reason is due to many reasons: 

There are some significant local noises coming manly from a mobile cellphone antenna and another unknown source . The one is heard as ignition type while the other as as like a shift carrier mixed with some noise

Wishing to get better in the results of other vloggers  i have made a playlist. this playlist has been watched a few times before making the order
 

I have also noticed that the circuit introduced  some 'router noise' as i cal call it 

It is a shifted or freq agile noise carrier. It  sounds as shifting buzzer as heard before the 2018 when my main radio was a ICOM R75.  In SDR spectral view it is shown as an unstable  noise carrier. most people advised that this is the problem if the stepped transformer available in ALL routers of the trade . Here is a photo as grabbed by one remote kSDR: 


--End of topic--

in just 25 days i have received the parcel with a box typical to this product


This is what is included into the carton box: the loop antenna , he active loop tuner on the left and three cables: BNC-BNC jumper  for SDRs , BNC-3.9  for shortwave radios and a USB C type adaptor cable 

Plus a mini guide to in both Chinese an English and several afrolex leafs 

The usage is very simple IN just seconds you can connect the metal circle into the base via the BNC plug socket and use one of these two cables to connect into the radio receiver or SDR. 


  IN work!

Its usage is very simple : Just turn on the pot and tune to to the desired frequency. in contrast to what i expected the antenna starts from the higher parts of the SW band and gradually tuning lower. The inside of the pack includes an  active tuner that produces a frequency dependent Q with peaks as high as 20db in he 5 MHz.And more important the battery was drained when i  tested the loop fir the first time. I had to immediately charge it with the  cable included in the package

After long usage in just two hours i found it having several flaws. Im sure that it has noe been passed for control quality otherwise the QC could to put ot in the junk 

 --------------------------------------------------------------------------------

IN short these are my findings

Using radios  (list not noticed in the video )
-High noise is introduced with power on
-Circuit leaks at power off. Conveyed and audible via the cable to any radio
-Strong spurious signals adjustable by the potentiometer
-once switched on there is a strong annoying noise from the loop circuit
-The tuning SNR is  lower than radio's telescopic antenna!
-Rotating the loop 15 degrees clockwise from the circuit box
axis can remove most of tuner noise The female BNC base is a bit loose. 
-I Prefer to rotate the whole system for removing the noise. this si the only part that works OK with this system !
-BY chance scanning on the MW band i found a typical 'router noise' existing on 15xx kHz with switch off

 

The proper loop angle to cut circuit's inner noise


Also  noticed with my SDR:
-Low Q in the top of the band Zoomed out can show hundreds of spikes most of them are from my PC .At least 3 meters far are needed to get rid of them.
-Two Image  peaks while tuning the circuit  in addition to the tuning peak-as i tuned below the 8 MHz or in 7-8 o clock
-Tunes only between 4.36 to 20 MHz .
-Harmonics up to 90MHz (!!)


Radios used : PL550 / PL330   and RSP1a SDR

And a few more screenshots :


Here si the SDR equivalent for the power leakage while the antenna tuner is turned off. I can find these 'noises' while using any radio with ATTenuator OFF  These signals are quite low

The lowest tuned frequency is around 4.3 MHz ,The Q could be very high and with very narrow bandwidth. this is also part  of the noise  transmitted by the router[s] from the 7 floor building. A short search can show a least 12 routers !

 Some closeup on the higher part with some test details
 

This is a scanner picture that shows the harmonics produced by the antenna tuner in the position of "6 o clock" Please Left Click for watching the full sized screenshot  

________________________________________________

I have made a few videos posted in my Youtube account and also notified the seller for these problems. He responded that the company is off  due to a national feast so i have to wait sometime.

https://youtube.com/playlist?list=PL9gILW4OYgSEU4bNWIGP-ULt9AMbTOT2v

The first 7 videos are my own  3 made on as 4/6/22 with SDR in mind on the centre of the city while 4 more added on 7/6 in a more clean place .

The above  list was also posted before 4/6 in the comments under the remain vloggers pages for asking comparative results. After 5 days I received the first reply:

Hello My Radio Friend,
You should try your GA-450 antenna outdoors it is quite sensitive to QRM indoors.
I tried it on several Sony ICF-2001D, Tecsun PL-880 receivers outdoors with no problems.Indoors on my Vintage receivers it depends in which room of the apartment I am located.
I live in a building from the 1960s, in a small town and a trial in the countryside far from sources of electrical pollution would be worth trying.
Maybe also, look at the side of the computer power supply, sometimes switching power supplies create disturbances...
Try to put several ferrite cores on the coax of the antenna and on the cable of the PC...
Well, I'm really sorry that I can't give you more information about these problems.
Let me know if going outside solves these problems.
I wish you good luck, 73's, Friendships at the Household and see you soon.

Indeed he was right only for one : the sparks. Just putting the antenna around 3 m far from  the laptop the sparks nearly diminished but all other 'flaws'  remained. I can believe that the item didn'y pass the QC I will also follow his guidance to do the outdoor test  

________________________________________________________________

Update:not so much later I have bought a new one from amazon de  that  form a Chinese seller but different from the above . It came in just 11 days . I immediately tested the battery before operating it. It was also drained as with the previous pack.  I left the interface charged for around  15 minutes an immediately made my comparisons. The first  was to check what happens with the interface in medium waves

In short the loop operates quite better with the same noise level as the first but: 

  • Q levels are quite lower than the first with up to 25 db of gain That means also that the tuned bandwidth is broader.  (2.5/5)
  • Noisy as the other after switching ON the interface (2/5) I think that they have replace the FETs with other model that has lower internal noise.
  • Lowest frequency is roughly the same at 4300 kHZ (OK)
  • The interface in off duty produces high noise on MW that covers all the MW band Once again the interface leaks unnecessary battery power and can drin it in short time (2/5)
  • Does not tune on MW but as loop it can remove nearby noises,  (4/5)
  • The RSP spectrum analyzer shown NO harmonics above the 30 MHz! (5/5)
  • In short the loop is quite better with minimal problems comparing to the previous.   Objective Verdict 3/5  but comparing to the previous yields 4/5 
 
  • MY  proposal is : (1) replace FETs with others with lower  internal noise (2) recheck all stages for any power leakage.

Full  visual report is here - no comments just tuning the SDRplay across the bands It is also added in the playlist mentioned above: 

https://www.youtube.com/watch?v=cQcxIQz4mxM

I m now thinking to return the first loop for the quest of money.

 

 --------------------------------------------------------------------------------

 

Two days after thinking to return the first loop i tested it once again. I fist charged the interface for around 15 minutes as the time passed and he inner system leakage drainer its battery. Immediately used the   SDR uno as testing program

i was very well amused that the loop behaved exactly as the second! Checking if i used a wrong interface was mistake as in the firsrt loop  i used a tape marker to separate from the other - no tape-

I really wonder what this can mean ... it that behaving as ...human??  

the only  minus is the strong noise introduced by the circuit



Sunday, May 29, 2022

RX and comparing the Youloop clone

 


Less than one month after I have received the clone and left tit for the bet time to  test it. 

First notice about my other experiments with a home-made and the original received  from the rtl-sdr-blog in this link https://zachs-radiopage.blogspot.com/search/label/youloop

A short notice: I asked the seller to include two more sets of boxes but his messages shown rather unwilling to help me by no replying the  cost and possible additional shipping . I then immediately made the order after 4 days of waiting After receiving the parcel in 15 days i kept it in  a dedicated box for the Original antenna and left them for a later check. Finally this check has been made on the end of may!


Just a comparison between the boxes As you can see the black boxes are quite bigger than the originals but i also suspect that they are more stiffer and resistant in case other cables will be used. My idea is to replace all cables with TV and use longer reception cable to receive better the lower frequencies Even the  sockets are a bit  longer than the other's!


The tow antennas waiting for the test . as with the previous test . i preferred to keep them handing into a suitcase hanger. The clone's cable is possibly the same but it has a bad winding tat kept it quite irregular.The clone antenna used a 6 m cable  tested a few times for the report here but later it was left back to the common box



MY first time i used them together  hung into the door so i could test them with nearly no external signal. Instead of checking with their cables   separately I preferred toi use the original's cable for testing I already posted two videos in YouTube :

https://youtu.be/euplMxob8Xo    is the video testing reception on GCN 

https://youtu.be/eAbVYf29eCo  a video with step increasing and decreasing the frequency of SDRC in order to do comparison with the local noise. 

https://i.postimg.cc/rmjbN1tf/IMG-20220528-131841.jpg

For unknown reason SDRC video recording stopped abruptly after 2-3 mouse rotations. Debut - paid option- was the only solution to grab video. It required  nearly half minute to stabilize the PC system after opened. Sometimes the CPU gets hot because of it.

 

Sunday, March 27, 2022

Fast review of a toy radio

This is a radio that i use long ago around 3 years. A technician from the gas company used it used it the time he installed the  main hub for the building .It was a relatively small radio with many features. it included a torch  a LED light and MP3 and standard radio

I didnt find the same but something very similar and quite bulkier

This is something  similar to Waxiba or related radios but now is designed with DSP technology. I have not opened its rear but know from the relatively poor audio in FM

Now what makes  this radio so  interesting that i post it here? AS you see this radio has a a player as it can be seen with these 3 buttons on the bottom of he tuning screen
And yes this is a interesting mp3 player with clear audio  !


For unknown reason the photo has been  shut in inverse You  can see :
- A t3 stop switch : OFF , MP3 player, Radio . If  switches to mp3 it can be use aslo as Bluetooth speaker! Thogh the older times it worked OK in the most recent times it went off
-Volume level. it is a standard potbut in quite low levels the volume raises very high
-Tuning - very typical =
-DC9 V using the miniD  plug the standard plug 4 years ago

-6+2 radio bands (FM/ MW ), The shortwave bands cover quite broader than the standard radio band . MW can be used for roughly 520-1700
-micro Sd memory or USB plug for external memory
-5 V from PV systems !!
-two positions for torch or LED light !!


This is the LED lighter and the torch !

...and finally 


 

This is the inner side of the battery compartment .Now what is the funny?
This radio except of using 3 AA batteries includes also a standard Nokia BL5 C battery!!
Its price?  Just 11 eu that time that is  ridiculous for its rich features!

Sound ? ts sounds sharp for FM and mp3 . Unfortunately the sound in AM mode is limited by the inner DSP filter keeps of ca  3kHz. 
Second mistake : 4-6 , 8-11.14-17 MHZ bands are missing 
Third mistake : there is not a earphone output

Sensitivity? It seems good
Overloads? really this is the only radio so far I have tested not no suffer from overloads!
Band accuracy? Rather no Once i was listening a station on 71xx but after checking with the PL330 the station was located on 7220...
FM band is the standard 88-108 plus 2.5MHz in each end
MW starts from 531 to about 1700

Battery life: I can assume around 60 or more hours if used at jut above threshold levels ! This i my favorite radio for sleeping or waking up in the moms house and listening news from local or  national FM stations 

Here you can listen to samples from the radio 

https://app.box.com/s/v7cf9si1cblhjp5abp8ia83r8mo8dhu3  and 
https://app.box.com/s/h45ld79o3hiipcx3rnucdayeowx6wt0n

The one shows reception on shortwaves and the other is a FM scanning

-.-.-.

Hope you liked this review ! If yes please post below your comments !

Thursday, March 24, 2022

Short review for the Youloop antenna

The Youloop antenna has been bought via the official site of RTL SDR in ebay.It has been received  without any problems in the standard Speedpack time of ca 15 days. I waited a few days more when i returned in Thessaloniki two weeks after. 

It has been tested with the Airspy HF+Discovery   and its 2 m cable. 



interesting to see is their dimansions !

Reception on the bands above the 15MHZ is quite very poor: System   threshold is ca -150dbm  with signals shown in the band with n more than 20 db SNR These stations re usually heard strong with standard radios as PL330 or PL550 fron Tecsun

The above copy  is made with my SDRConsole, my most prefered program  for making SDR reception. S units and  dbm levels are the standard method to evaluate signals . Notice also the spurious nd self generated  signals that recur in the band


 

Airspy in contrast 'zooms' the signal ie tunes better with its counterpart antenna (Youloop),   I cant prefer using Youssef's program (SDR#) as it is not well normalized as the SDRConsole. This program that suits much better for scientific research. As far as I remember it has all the whistles and bells to so  a more serious  and scientific signal analysis work (signal history analysis, 3D , multiple audio recordings etc just look at )

a few interesting hints by using it

(1)The door nearby the mini PC  (laptop) has the highest signal indoors! It is one f the few points where the noise is very low with levels of 15+ db as shown in the radio signal level readout . Antenna hung in the door with a 'cloth hanger'. Turning this door cold remove most of the local noise and offer also cleaner reception :

https://youtu.be/qdCYASiJWck  my mom helped me to turn the door!

(2) Outdoor reception offers higher signals and SNR . Correctly rotated antenna can also remove nose to the 20db level except router noise. More than 12 routers can be detected with my smartphone in this building .The range  effected is 150-1200kHz - partially-  , 3-6.5 and  8-11MHz

https://www.youtube.com/watch?v=pycoPZ6Aquo

detailed info with photograph Just click on the photo to see beter:

(3) HF+D can also be overloaded with this antenna . N Greece is flooded with more than 15 signals [er band of S9+20-40db on the 49, 41 and sometimes 31mb

https://www.youtube.com/watch?v=yZWj0Is6beU

What i didnt like  with the antenna's  metalic hardware : this  antenna will be used for Dxpeditions with some temporary use per event These connectors require very careful usage and for sure they can easily break. If  the box could be could be a bit bigger/sturdier  ass their  competitor I wold feel more safe for more everlasting usage 

I would also like if there would be a more permanent system design.

IN the VHF band the signals are better that  i could expect ....I found this video useful:

https://www.youtube.com/watch?v=u-TbWOPP-cQ&t=1s

I m generally quite impressed with this antenna  in the lower parts of the HF scrotum.
I now think to use it outdoors that is adding modifications on the support , extending the cable and possibly add an LNA near to the loop.. 

 ========

Update: testing with standard radios

I added  a SMA-3.9mm mini jumper after the antenna lead  and used: One  analog PL550  and the DSP PL330 radio. Both are from Tecsun.  Results are as follows:

-PL550 good and deep nulls
-PL330 not so deep nulls 


https://www.youtube.com/watch?v=lCv0m6mzghU

..with PL550 only.  Antenna's shadow  in shown in the chair the time i turned it back and forth . Notice that most of the noise is automatically removed thanks to the ANC - auto noise cancelling - a feature that is built in on my smartphone


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