This L Band Helix Antenna Gives Amazing Performance

Рет қаралды 24,406

7 күн бұрын

In this video we test a Helix and antenna designed for the L Band and to be used with a dish. Results are better than expected.
Antenna available here:
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Пікірлер: 58

@fatboymotorsport 6 күн бұрын

For those of us who cant guess where is the audio from?

@Trev1916 5 күн бұрын

Slow the audio down using 0.25 speed and you can clearly make out the medium from Poltergeist movie saying "come to the light Carol-anne"

@rcczar2885 5 күн бұрын

The Chipmunks command centre.

@stevehageman6785 5 күн бұрын

@@rcczar2885 I knew the Chipmunks would eventually take over! 🙂

@patrickbodine1300 5 күн бұрын

The end of a pipe.

@repatch43 5 күн бұрын

Same, what kind of audio is it? Is it pilots transmitting? Or are they POTS phone calls?

@michaelcarey 6 күн бұрын

Great video! Reminds me of fun times back in the day of Inmarsat A with a similar antenna set up and an Icom R-100 receiver. I won't confirm nor deny that I was able to hear anything or decode any RTTY :-) Ahh, the days of analog satellite communications was fun.

@Subgunman 6 күн бұрын

That decoded audio sounded like some of the early voice encryption modules that split and inverted the audio frequencies.

@unsafe_dB_level 6 күн бұрын

Yes, the way he "disguised" the audio does sound like voice inversion.

@rohnkd4hct260 6 күн бұрын

Good job. You can hear some funny stuff and some very serious stuff. I’ve hear some VERY sick people flying somewhere. Heard a pilot call his base to report the “bar totals” did not add up. Would love to know how that turned out! LOL

@ryank5tar 6 күн бұрын

Awesome video. I plan to build antennas like that soon.

@stevehageman6785 5 күн бұрын

That's great EoNb on the decode - I have one of those cheap 4x4 inch active patch antennas and even though the EoNb is only 8dB, it decodes all the Inmarsat ACARS perfectly. For people starting out - there are web based applications that take your location and draw you a map of where to point your antenna to get the selected Satellite(s). Makes quick work of setting up - you immediately get close and only have to tweak the antenna after that.

@bluegizmo1983 21 сағат бұрын

"Should not be decoded" ... challenge accepted! 😂

@M0JHN 6 күн бұрын

Yes for the bigger dish comparison

@digitalmediafan 5 күн бұрын

Fantastic. I would try using SatDump for voice but I have never had any audio out with this when using for Noaa weather sats so guess it won't work with this ? Is the frequency shown a voice channel ?

@sgtclubba1732 4 күн бұрын

The voice uses an ambe codec. Not used satdump for inmarsat before, gotta try now.

@pjg54g 6 күн бұрын

Great video but no idea where the audio might have come from. I guess I missed all the clues? Help!

@laykalayoni1314 2 күн бұрын

Excellent video Mat. I have been decoding these signals with a small patch antenna for some time now. Try decoding voice using a stock rtl-sdr v3 as my much more expensive Airspy Mini was absolutely useless.

@earlyadapter643 6 күн бұрын

Today i just finished and tested my 2.5 turn helical feeder with increased diameter (65 mm) so that it fits around a standard LNB radome. For QO-100 it performs poorly. Maybe i should test it for L-band ? However it needs more measurements to conclude, it may spill over the dish, under-illuminate, have a bunch of ugly side lobes or the PVC tube that the helix is wound around is absorbing. I could get the SWR down to 1.3 though... As i said before, i sometimes try things even though the chance of success is 5% and sometimes it works.

@paaao 5 күн бұрын

5 db stronger signal with dish, but also a 5 db stronger noise floor = a wash correct?

@nofider1 6 күн бұрын

Thanks Mat, Some more stuff to play with..... :-)

@Allan_aka_RocKITEman 6 күн бұрын

Great video...👍

@sparcnz 4 күн бұрын

Great video as normal. Just to clarify, is this antenna suitable for all Inmarsat systems? I would be looking at the Pacific based Satellite coverage. Regards.

@TechMindsOfficial 3 күн бұрын

L-Band yes, i.e around 1.5 GHz.

@craigspada1676 4 күн бұрын

Super video, I have built a number of Helix antennas for vhf and uhf for ham satellites, enjoyed the video, you always have very interesting products. 73's WA2TWF

@TechMindsOfficial 23 сағат бұрын

Cool, thanks

@ruperthamblin3605 4 күн бұрын

Great video Matt, couple of follow up questions… - Can confirm the performance between the dish & small helix & the grid antenna….? - I’d be very interested to understand how you got Aero H+ audio to work with Satdump…? Was this real time or from recorded baseband file…? Cheers

@TechMindsOfficial 3 күн бұрын

Dish will always win, IMO. Satdump was real time :-)

@snaily1972 5 күн бұрын

Not sure if you have done a video, cant search at the moment. Have you tried Aero on C-Band?

@TechMindsOfficial 5 күн бұрын

Not yet! But I plan to, just need to get the LNB for it as I have a 1.8m dish I can utilise .

@snaily1972 5 күн бұрын

@@TechMindsOfficial great look forward to it. I'm wondering what the minimum sized dish one could get away with on C-Band. Would love to have a go but space is at a premium.

@georgesv8arj48 2 күн бұрын

Great video as usual. At around 8:20 jaero fails to lock. Try same setup with Airpsy-R2 or RTL-SDRv3 or Funcude Pro. You will be surprized ;)

@VA7LFD 6 күн бұрын

Is it right hand or left hand polarized? Are Immarsat L or R?

@RubenSmitGooglePlus 6 күн бұрын

Inmarsat transmits a right hand polarized signal. When you recieve that signal via dish the polarization flips, it is mirrored. So this antenna is left hand polarized.

@antunes7831 6 күн бұрын

88 PY9BG

@XRinger 5 күн бұрын

At the beginning of the vid, I was thinking that small LHCP antenna was a dish feed, rigged for RHCP satellites. Long ago, when I had a 10 foot dish, I made a 1420 MHz RHCP feed, so my dish would reject RHCP GPS etc signals. I could listen in on the hydrogen line at 1420 without all the GPS RFI. Radio Astronomy was fun, and I could hear EME SSB from South American hams. 🌙 Bounce.

@ostanin_vadym 6 күн бұрын

Thank you for pleasant further video watch.

@TechMindsOfficial 23 сағат бұрын

Thank you too

@ocsrc 3 күн бұрын

It is amazing how much L band is coming down from antennas. We have a lot of the TV and radio stations using this band for their feeds to their broadcast sites via satellite 🛰️📡 I didn't understand why the land based services and radios for the L band were eliminated. Once I saw all the data coming from the satellites I realized that if we had land based Radios they would interfere with these satellite transmissions being received like the 5G signals are interfering with the C-band signals on the same frequencies.

@maeswdy 4 күн бұрын

Tell us about the pirates on inmarsat

@petewright2283 6 күн бұрын

I have a spare LNA & SDR I can let you borrow

@heyitsburt 5 күн бұрын

please show us as I am getting into the hobby and thankful for you showing the applications and how you have things running

@KA4UPW 6 күн бұрын

Wish it had more than three turns

@stargazer7644 5 күн бұрын

Then it wouldn't be terribly useful for illuminating a dish.

@KA4UPW 5 күн бұрын

@@stargazer7644 Is this true? Thought that was a function on how far from the dish its mounded?

@stargazer7644 4 күн бұрын

@@KA4UPW It will always be mounted at the focal point of the dish - a fixed distance from the dish. The number of turns on the helix depends on the angle needed to illuminate the dish correctly without overspilling or underilluminating the edges.

@KA4UPW 4 күн бұрын

@@stargazer7644 Then it sounds like the number of turns need to be optimized for the size of the dish. I definitely need to research this more before making any purchases

@rogerhargreaves2272 5 күн бұрын

I work at Inmarsat.

@maeswdy 4 күн бұрын

Tell us about the pirates on inmarsat

@rogerhargreaves2272 4 күн бұрын

@@maeswdy Oh, that’s for commercial shipping transmissions; I work in the aviation sector of Inmarsat.

@RESISTAGE Күн бұрын

LNA - low noise amplifier . who in their right mind would wanna amplify the noise ? I want to lower the noise to be able to amplify the signal .

@TechMindsOfficial Күн бұрын

Not sure if you’re being serious or not, but I guess that’s a literal way of reading it. An LNA is an amplifier that has low noise…

@RESISTAGE 4 сағат бұрын

@@TechMindsOfficial then it needs to be called properly because that's how I understood it . looks like Google translation from Chinese . we amplify signal not noise .

@kurtbrauer855 5 күн бұрын

? For What?

@sky173 4 күн бұрын

"...yes ...see if there's anything else....Totally unavailable. what else you [we] got? Any... um... naw, yea, naw... what ummm ... ok, so... Sorry? yes, this is an email address." This is all can can figure out. The accent is very hard to understand.