Hello,

I've tried to contact whomever at the IRC channel, but no reply.

Please email me when its tested and ready.

And keep up the good work.

Sincerely,

Martin

Hi Martin,

as you've seen, you sometimes need to be a little bit more patient on IRC, until someone can answer your questions :) Thanks for the nice talk.

Chron0,

:)

YUP!

Sincerely,

Martin

This antenna is kind of tapered helix antenna and must be installed horizontally pointing to a transmitter.

Hello Margot,

where did you get this information? The antenna that was disassembled here was working for years as an active receiver antenna with an ICOM-PCR1000, a Realistic PRO-2400, an ICOM IC-92ED and lately with the rtl-sdr all in an omni-directional fashion, mounted vertically with very good results, compared to multiple groundplane and discone designs, at the same location. I can assure you, it's not a helix antenna, perhaps you've confused the designs, since the ARA might look similar to the gamma match, helix antennas ususally have attached at the bottom, to get them back to 50 ohms.

Any updates on this? I'm needing to construct an antenna for my SDR and this looks quite interesting.

At this moment, this is all there is. My personal resources are currently bound in DSpace, but I was hoping that we can come to the same principles of working as we do in software development.

The Resources are online and freely available, someone else takes the information, uses it, perhaps builds an LNA, tests it and submits it back to the net, might even give a ping/pull-request. It's interesting to see that each month over 350 people visit this page, getting all infos for free and even without any ads or other forms of commercialization (as it should be) but the level of external contribution, feedback and improvements is rather low.

Sitting and waiting for other people to do stuff for us instead of doing it ourselves is one of the key components of why we as a society are where we are right now. Instead we should connect, share and redistribute. Take the information here and go to your local ham-radio/hackerspace group, build it, test it, improve it. :)

The basics are here and if no one else steps in, the antenna will eventually make it back to the lab in order to continue improvement because it certainly was a very well performing general purpose receiving antenna. But this all depends on support from other people in order to have more resources for different projects.

If enough SDR/RF people in the area of Munich are interested in building this, it would make sense to make a workshop. This way we can get the materials really cheap and will also have fun and learn/build something together. Maybe someone with solid LNA design knowledge would also like to join, to have a final complete rebuild manual/partlist.

I have a LNA kit that I can probably try with this. Once I get it built, I'll see about constructing a copy of the antenna. I'll be sure to post back here if I come up with any useful data.

cool :) I'm looking forward to it, because that's the only thing missing at this point, and since the antenna is relatively easy to build and inconspicuous in appearance, we would have an open and free wideband receiving antenna :)

I also would really like to try out the BFP420, which is cheap and available. I already got the chips but no time to play with them :(

The LNA kit I have is based around the Mini-Circuits PGA-103+. The BFP420 also looks like it has some nice specs.

Another problem is that I have no antenna analyzer or network analyzer so my tool for determining how well the LNA or antenna is working is looking at the gain and noise on my SDR software.

Now if I only had time to actually turn the soldering iron on…

http://www.minicircuits.com/pages/npa/PGA-103+_NPA.pdf

Same conditions here. Network Analyzer is even on the lab wishlist, but since more funding is needed (which I have to come up with through the dayjob as Apollo-NG doesn't receive real additional funding from other sources) it's lower in priority in order to get Apollo finished and finally on the road. The minicircuit looks good, but they are somewhat of a hassle to get in Europe and they don't provide free samples. However, since this page already receives a lot of traffic from people looking for sdr wideband antennas, it's probably just a matter of time until somebody can contribute something more to it :)

What about using one of the kits off this page? http://www.g4ddk.com/ I have the SPF5043Z amplifier which I bought to attach to my discone, however I'm considering building one of these and I'd be able to put it outside, unlike the discone

The 2nd amplifier on his page that looks good is the PGA kit. Maybe someone else can try this or tell me if it would be worth trying?

Both kits are (UK)£12 each and I think postage is (UK)£5 so well worth trying.

Lewis

That seems like a good option because having the antenna outside really makes a big difference. There is also one more option, that wasn't tested yet:

How does the system perform, when the SDR is connected directly to the antenna element (without LNA)? The LNA originally was only there to mitigate the losses of the coax cable between antenna and the receiver. What if we put the SDR directly to the antenna element and then use 5m USB cable to get indoors (should be enough for window/balkony placement)?

I'd think that “remoting” with the USB cable would be more efficient than running a lot of lo$$y RF cable, esp at the high end of the tuning range.

Regards,

Paul <K9PR> Retired antenna engineer

– Repair is the ultimate recycling www.workshop88.com

Does anyone know where in the UK sells Material PVC pipe or something similar? Length 450mm Diameter 90mm Inner 84mm

I can't find anywhere that sells it cheaply, the cheapest was around £20 which is a lot as I only need 450mm (appx) length

Paul I did consider “remoting” the usb cable, the only problem is my rx is 150Khz - 2200Mhz and I need a 2nd antenna connected for HF so unless I spent a lot of money on some kind of remote external antenna switching it would be cheaper using the preamp and probably better anyway

Has anyone actually built one of these yet and if so how did they work? Does Anyone know Anywhere in the UK that I can buy 90mm OD PVV tube? The only places I can see that sell it want stupid money for it - between £35 and £150 I only need 1M length at most.

Lewis: I had some trouble myself finding PVC pipes in DE. The sources I finally found I got from one of these “national industry supply webcatalogs” if you know what I mean. I'm sure there must be websites listing UK industrial companies by business type as well. I've been in contact with numerous companies since I started to build Apollo-NG and told them what I wanted to do and - although by far not every company but still - quite a lot offered to send sample material for free.

Thanks, in the end I bought clear acrylic tube http://www.ebay.co.uk/itm/300751953750 Hopefully RF passes through it ok, and I also bought black heatshrink to cover it - couldn't find white large enough. I've got another month or two before I can put it all together and get it outside, I have 2 more antennas plus a satellite dish to put up at the same time and I can't climb ladders due to being disabled. Hopefully by June it will be up and working

Somebody else was tinkering with an RTL-SDR LNA design and at a short glance it looks pretty decent with a fair price. Haven't looked at the real specs yet but I wanted to share the link (also updated in the LNA section):

http://lna4all.blogspot.de/2013/04/lna-for-all-low-noise-amplifier-for.html

@Paul:

it can be done even better:

TP-Link MR3020 or clone as RTL-SDR server with PoE

“it can be done even better: TP-Link MR3020 or clone as RTL-SDR server with PoE”

How? Thats for a 3/4G modem not an rtl stick

@TC: Indeed, that is basically what I've been doing with the Argus setup.

Hi.

I would like to make a PCB to the LNA. Can anybody help with a good quality Picture?

Thanks in advance OZ5ZI / Finni

Hi Crono.

I understand your disappointment that everyone wants, but no one sends back. For my part, I have no istruments and no education to make measurements on such a complicated antenna. I am a radio amateur and can make more simple measurements. But if I find out anything else can benefit from I send of course into. If you have a top picture is good I do not need ruler. I am familiar with PCB manufacturing and will adapt according to what I can get by PVC pipe. But i think the coils on pcb are importent.

Yes, right.

In the meantime, I have tried to

get the used “original” IC`s.

But they are no longer on the market.

So now I make my own PCB with

maybe Mar6 or similar.

Regards

I tried to build the Antenna. But I was not able to “Transfer” it to the Copper Foil.

Can Anyone give me a hint how to Draw it in Original size?

I also have an “Old-School” 3,6GHz Spectrum Analyzer with Tracking Generator and Directional Coupler.

So maybe I can make some Measurements.

But what is the Best Method to connect it to the Antenna? (Without LNA)

Ok…I built me a Dressler.

I did some Frequency Response Measurements. And Compared them with an Original “AOR 50MHz-3GHz Discone Antenna”. I'm no RF-Engineer. But I must say, I'm Impressed by the Dressler.

I think the Dressler is Usable up to 3GHz. The Dressler performs very Good at Higher Frequencies over 900MHz.

I did some Tests, with a Ground Plane in form of a Copper-Epoxy Board too. I think, this Improves the Performance.

I May post the Results later.

Here I found someone, who Re-Invented the Dressler for himself: (Real Engineer :)

http://www.leobaumann.de/funk.htm#ghz2

I just started playing with my SDR Sticks and found this awesome antenna which would fit all my purposes. I read that some guys are from Munich and interested in re-building one of these. I am also interested in building one or two.

Her is my idea:

If we find enough people who want to have an antenna, no matter if they want to build one by themselves or built by others, we could get the materials very cheap. Especially the copper-foil and the PCBs for the LNA. In Addition we could order professional PCBs with better LNAs and see if this make this antenna even more awesome

I would be happy to get some Mails if you are interested.

Brilliant idea I find trying to get the right amount of foil in England hard, Although there are other LNA's out there, getting one that was built to go in the antenna and attach directly to the foil would be brilliant

The other thing Ive found impossible to find in England is the outer tube, 80mm inner dia tubing is practically impossible to find, and also the end caps for it if I had found one, this is the only thing thats stopped me making one yet

If you do decide and go ahead with making a new LNA with pcb for this project, can you use one of the newer lower noise ones with as much gain as possible? I for one would definitely be interested in buying it (providing it wasn't stupidly priced) This one seems ideal and is only €20 http://lna4all.blogspot.com I especially like that it can be powered from the cable, ideal if we were using a reciever that can provide 5v through the cable such as the Funcube Pro+

Hi.

I made this dish. But not with copper foil but quite thin PCB And I have used RF2132 IC as amplifier. As a recipient RTL stick from China. And the original PCB layout. I do not have good experience with the antenna. This antenna + RTL stick is a very broadband system that brings together all the noise up. So I think that much depends on the receiver along with this antenna. It must be a receiver with some good filters in the entrance. I would say a high performance receiver. The signals that it might be interesting to receive are often far away. Perhaps as a mobile system where you can drive closer to the signal source.

Vy73 de OZ5ZI

Question. Does it need to be built out of copper foil ? What about using aluminum foil which is readily available in the kitchen. Understandably Al might be lossy, but the LNA should take care of that. Am I making any sense at all ?

Is the copper one piece or is it 2 pieces taped/soldered together? I see some black tape on some images, in the middle of the copper.

That would actually be quite helpful to know because you wouldn't need as much copper foil.

Has anyone done anymore with this?

I found a source of cheap bias tee's on ebay (MMDS downconverter bias tees)

all I have to do is cut the 240v psu off and supply it with 5 or 12v whichever the lna needs

I've also found a source of cheap 28.8M Mhz TCXO's so hopefully I can replace the crystal in the rtl sdr stick and have 1ppm accuracy

Once I get this antenna finally buily I can use this with one rtl stick and another rtl sdr with a hf antenna (hopefully)

I like the idea of having the sticks at the antenna and using a router to get the signal inside

Can anyone give intructions or tutorial on how to do this?

I'm still looking for the outer tube, cannot find one in the UK a suitable size cheaply

I havent made/got the lna yet either, I was waiting to see how others did first, I'm considering a GPS active antenna which I got cheap £3 on Ebay, taking out the GPS saw filter and it should be a low noise wideband amplifier (hopefully)

Does anyone in the UK got any ideas where I could get some PVC tube 450mm (500mm) long ???? - and end caps for the tube Outer Diameter 90mm Inner diameter 84mm

I've searched and cannot find anything suitable - any ideas or clues on where to look would be great please

I've been looking at the idea of rtl_tcp and done some research

What do people think of these??

http://www.cdlmicro.co.uk/usb2-boost-usb-2.0-to-rj45-over-cat5-cat5e-cat6-extender-repeater-cable-lead-wire-adapter.html

Basically for those who don't like clicking links, its an active usb repeater using cat5/5e cable

IF it worked the way I think it might, it would allow the receiver to be mounted in the same tube as the antenna/amplifier (or very close to it) and eliminate all cable losses

Would this work for the copper? Its cheap

http://www.ebay.co.uk/itm/291333330893

Hello… I think I solved the tube diameter availability problem … just take some one sided self adhesive plastic/paper and roll it to the diameter requested. Be sure to draw some lines that will eventually overlap at each roll so that you have a control mechanism for rolling the right size. Do the rolling as many times as you like/or requested. Also for fixing the cooper foil on the tube we could use kitchen transparent foil and after that another roll of the above plastic/paper from which we built our cylinder. Take all this and put it in whatever bigger plastic cylinder you have cause I don't think that will interfere with rf. Be aware that not all plastics are resistent to uv light and I don't know if painting the exterior with spray paint would interfere with rf. I think that a piece of polypropylene water tube is a good place to start.

A good add on to this antenna would be a diy pcb design for the LNA and for a 5v or something power injector trough the coaxial cable.

This is a nice project and I hope will get a good final result as long as everyone solves a small part of the problems

Keep the good work and thanks.

I'm nearly ready to finally put the parts together to make the antenna

I have a problem though - I hope someone has some ideas how to fix

HOW do I mount (attach) the 90mm diameter antenna to a 2 inch (50mm) diameter pole?

Any ideas or suggestions? pictures would be good if you have ideas please

Help

Can anyone tell me HOW to print the svg file properly?

I've tried everything I can think of and it doesnt end up the same size as the original

The closest I have got is 61 X 52 X 17cm

I've got Windows 8.1 X64

I've tried, paint, acdsee, inkscape printing from chrome and internet explorer

Inkscape was the one the forums said try so I downloaded it,. but it just prints a blank page and not the image

The only thing I could get it to do was export as a png - it wont even export to pdf

It will print as pdf but only saves a blank page

Lewis

Well I made mine last night and got it in the attic today.

Must say - first impressions is I'm impressed.

I was able to audibly hear Noaa 18 today when it was appx ove the east border of Turkey, I couldn't hear it that far east using the proper turnstile antenna tuned to 137Mhz - it was in the noise but I could definitely hear it as well as see it on the waterfall of the sdr receiver.

It's only in the attic at the moment, I'll get it outside in the clear and higher sometime in the next couple of weeks (hopefully)

I used 1mm thick copper foil bought off Ebay, and a preamp off http://www.g4ddk.com ( http://www.g4ddk.com/PGAV2.pdf )

Stuck it inside a tinplate box and shoved it inside the tube under the antenna, the feed for the preamp I just used a short piece of 75ohm coax,

I use 75ohm cables and F connectors for my receivers, much lower signal loss, and the difference in impedance means nothing on receive.

Has nobody else made this antenna yet?

I'd like to hear other peoples views on how they think it performs

I build this antenna last year. It's placed in the attic with a few higher buildings in the neighborhood and located in a valley, so conditions are not that good. The LNA (cheap one for SAT purposes) is connected to the copper element via an F connector and the cable to the receiver is only about 5cm long. I use an raspberry pi to stream the data when I want to play around with SDR# or similar software, The pi is powerful enough to decode ADB-S/ACARS signals directly, so no need for streaming there. It's important that you use a cable connection though, WLAN might only work if you have a REALLY good connection. I mainly use the antenna for aviation related signals like ADS-B (1090Mhz), ACARS, FLARM(868.2/868.4Mhz) or just for listening to AM communications. This is the first antenna I use for SDR so I have no reference. There seems to be a lot of noise which might be caused by wireless devices in the home, not sure. I was able to receive ADS-B signals from 260km, which is quite impressive (depends on weather conditions though).

Built the aluminium antenna and had problems soldering the damn thing to the cooper wire … aluminium can not be soldered with soldering wire Pb to nothing, even to Al so it was only a contact transmission for the signal. Was pretty happy with the signal (first antenna built for 119 MHz AM and was ok but for the 1090 MHz was not) so had to go for the originall …

ReBuilt the antenna of cooper and I live with the sensation that the aluminium (4m cooper wie ) was better …. the cooper I bought is 99.9 pure (for electronics use, Pb solder sticks to this one and used multifillar cooper coax, max 10m wire for connection to the RTL) - 40eur for 3kg band 0.2mm x 300mm this is enough for 6 antennas per design) and when putting it inside the tube it bent freely … this was not my plan but ahappened to be the case, with aluminium as it was pretty sturdy and didn't bent easily, I will have to redo it to bend on the 80mm (now 67mm diam for antenna) tube and include it in some 90 mm tube when I figure out how to make it weather proof (together with the Gamma tube and the wind generator and the rasp pi 2.

This being said do you recomand/impose a setup to test the antennas? Software / Hardware recomandations like a procedure and predefined tests? maybe based on satellite signals/rtl chips and manufaturers strenght which should not vary too much over large swats of continents so we can have a reference?

I enjoy learning and i think this should be 4 everyone

dan. PS Could I not be human … robots do tests ?????

Could it be the same concept of PA0RDT mini whip? At first everyone wondered how that magic antenna could get so good reception being composed only of a LNA and a 3×3 cm pcb as antenna; then it became apparent that the real receiving antenna was not the pcb 3×3 but the shield of the coax cable. For this reason it was so important to place the antenna at a minimum height of 5-6 meters, because it needed a long vertical coax cable to receive

mhm I am new into radio stuff but I have a 900mhz version of this antenna but it seems not to function properly. It has a lot less noise than the tv antenna that came with the tv stick but does not have as much gain as the original antenna mhm…

Made one of these using 0.5mm sheet AL, 80mm inner and 90mm outer pvc. Add a few tweaks to make rolling and connection easier, no solder just a crimp tab on the bottom end. see this blog for pics.

http://cometal-comets.blogspot.com.au/2015/09/rough-dressler-antena.html

Updated blog with a link back to here.

Would be very interested to know. What are the important numbers in this design? the long 65/55 cm ? the 14cm at 90 degrees, of which I could only make 15 cm work? The angles of the long section? Is 40.5cm important? Is the vertical height of the spiral important? Please point to a good technical paper if you know one. Other wise I'll have to experiment??…. 8)

It is possibile to use brass instead of copper?

If you are looking at a source of 80mm tubing check out any source of high power rocketry components (public missiles is one source). A 3” tube is actually 3 inch internal diameter and 80mm outer diameter. The materials vary from cardboard which could be used as a form for the antenna. Other materials are phenolic, plastic and q-10 fibreglass. The 3.9” tube is just over 100mm outer diameter. The tubes come in 36” lengths. They also source end caps and various centring rings which could be used in the construction of the antenna. Note that all of these materials are RF transparent (the carbon fibre is not).

To all still following: I made some attempts at modeling the antenna and put my results here: https://www.samuelburri.ch/2016/06/10/ara-2000-antenna-model/ No conclusion as of yet. If someone can take it from here to improve the antenna or give me a few hints where to go it would be nice. I am no antenna specialist, only an electrical engineer that started a bit into SDR and plans to make this antenna sometime soon.

Hello all, some sources of materials for those in UK. 80mm former material is easy to find! Floplast gutter down pipe,metal tube/pipe stockists, fabricators,may even get an off cut for free if you look around. Here are a few links to get started. Thank you for making this info available, I shall build and post results/methods etc when I get around to it.

Copper foil http://www.tiranti.co.uk/edgeimpactshop/subcatdivision.php?Division=290 and http://www.fredaldous.co.uk/copper-roll-30cm-x-3-6mt.html

80mm tube http://clearplastictube.co.uk/80x3-1000mm-Clear-Acrylic-Tube

https://www.carbonfibreprofiles.com/index.php?main_page=product_info&cPath=5_149&products_id=349&zenid=qrvclu9lu5fjadhn9hi778p7b1

http://www.drainageonline.co.uk/Floplast-80mm-Round-Plastic-Downpipe/80mm-Round-Downpipe-x-4m-RPH4.htm

http://www.ebay.co.uk/itm/Aluminium-Alloy-Round-Tube-Pipe-Circular-Polished-8mm-to-102mm-upto-1-Metre-1m-/222164455072?var=&hash=item33ba088ea0:m:mjUL65OWft_T1Pnw8toBMgg

Will post more as I find them.

Almost forgot a source of 90mm pipe and end cap..

http://www.irrigationonline.co.uk/20mm-upto-125mm-pvc-pipe-various-sizes-2-x-50cm-lengths/

End caps http://www.irrigationonline.co.uk/products/PVC-Glue-End-Cap-Fitting.html will need solvent weld,available at any plumbers merchant,B&Q,Screwfix etc.

Nice to see recent activity on this thread. Thanks Dave for the links.

Thanks for this Chrono, has inspired me to have a go myself, sourcing components may be difficult in Indonesia, but that is all part of the challenge. Does anybody have any feedback on how sensitive this antenna is to local noise? I live in a very noisy city environment and am plagued by electronic smog!

Stats

Hi, i am planning to build this antenna, But unfortunately i could not get components for ARA-2000 LNA and fabricating PCB with filter for BFP420 is not economical. I am looking for alternatives like this

https://www.aliexpress.com/store/product/New-Arrival-0-1-2000MHz-RF-wideband-amplifier-gain-30dB-low-noise-amplifier-LNA/1748488_32668459406.html

Do you this will this work?

I wish that Chinese site would give the noise figures, instead of just saying “low noise”

I' wondering how 2 of these in series would work!

Have you received feedback? and how (put pictures)? Best regards Bernard

Hello the Group and manager

I am also very interested to make this antenna. Please actually give a new name to this spiral Log, why not call it: LG2016. I started its realization in respecting your data specified on your site for the dimensions of the copper tape. I placed the copper tape following your method on an actual diameter of 80 mm exact reference diameter tube Tube-pmma-extrude-incolore-transparent-brillant-80x74mm - 1 m

The French plastic supplier custom web link: http://www.plastiquesurmesure.com/MATERIAUX-Plastiques-1/tube.html?cat=66 For diameter 80 mm length 1 m = http://www.plastiquesurmesure.com/MATERIAUX-Plastiques-1/tube/tube-PMMA-extrude-incolore-transparent-brillant-80x74mm-1M.html For the 90 mm in length 1 m = diameter http://www.plastiquesurmesure.com/MATERIAUX-Plastiques-1/tube/tube-PMMA-extrude-incolore-transparent-brillant-90x84mm-1M.html

In the end of the installation of the spiral on the tube, I noticed that the spacing of the copper strip is quite parallel that is the spacing of the copper is not the same all along this spiral. The spacing of the copper tape decreases significantly upward. To be a bit more clear: In the lower part from the high point of the copper of 35 mm width Strip In the first round I have a 105 mm spacing In the second round only have a spacing of 33 mm It is worth noting that the final bottom of the second round is almost directly above the start of the copper tape. The copper tape did two laps on the tube.

My early production below

How, place a photo?

Is it normal for you to find this provision?

Specific points: It is noted, that I used a film easier and much less expensive than Aslan S22 to fix the future antenna element copper strip. Decorative adhesive film transparent smooth matte Reference A67-C3411 of society CORYL. Dimensions of the roll 67.5 cm length 2 m Waterproof film, UV-resistant Its primary function is its installation on window glass. It was easy to use it to fix the copper strip.

Second point: your project less than €50 uro is not viable, because nothing that the purchase of the two lengths of 1 meter of tube, already exceeds this value. For information the two tubes of 80 and 90 in length of 1 m purchased and delivered in all taxes = €76.44 uro

Third point: ATTENTION: for insiders names, especially not to realize this antenna with PVC color tubes grey found commonly around because in manufacturing it is added graphite (carbon) in its manufacture, which is not the best component for a good passage of HF VHF UHF waves and Hyper frequencies, because there is an absorption of waves due to the screen of the graphite content in this type of tube or hose. It is the same with the support of antenna masts: one does not use masts in carbon, but only non-conductive fiberglass masts.

In the end, I have not bent the tip of the antenna element which, for me, is not justified, because it is part of the item reception. I guess that initially the Dressler company, wanted to be in modules of Cup final tube in manufacture of 500 mm maximum length.

The suite coming soon

Best regards

73 Bernard

Hello No one wants to meet me! It's very Bizarre for motivated people! How to place images or photos? I analyzed the production of my great with my antenna analyzer DSA 815 Rigol .. How to send you my results? 73 BM

Hi Chrono, How would I go about uploading a pdf file? I have made a cad drawing of the copper antenna element, it can be printed 1:1, split over a few A4 pages, the pdf file has alignment marks to join papaer and a test line for checking dimensions. If interested I could email it/upload it etc.

Hi, you can upload at www.tinyupload.com and post the link here. The registration is not requested.

First a happy new year..

I started to build the antenna for my SDRplay RSP1 To find the copper sheet was a problem. Now i have one laying shiny here on the table. I found it on a chinese website www.Banggood.com Product ID: 961487 The have also connectors, cables and preamps. I don't tested the chinese preamps because i want to use a (MBVV-2000-VOX)external preamp. I will to try (2m & 70cm) to transmit on the antenna to for local usage.

73 Glenn.

@beckgyver, or anyone else with a BGA2709 based LNA, do you still have the LNAs you tested? There was a call for help on IRC:

( 10:26  gotramaval ) Hello guys!
( 10:27  gotramaval ) I´m modifiying the small LNA amplifier shown in this article
( 10:27  gotramaval ) specifically, the cheap one, that based on the chip BGA2709|
( 10:28  gotramaval ) While desoldering, I´ve spoiled completely capacitors C6 and C8 according to the board markings.
( 10:28  gotramaval ) Anyone with this LNA, can please measure the capacitance values of these two so I can replace them?
( 10:28  gotramaval ) many thanks!

I have got 0.1mm copper with glue on one side. Is there any problem to stick it directly on a 80mm orange PVC hose?

Im confused about the diameter of the antenna. It is stated several times that the diameter of the “antenna coil” is 80mm, but apparently it is put into a tube with an inner diameter of 84mm. Doesn't that mean that it will rattle around inside the outer tube, due to the extra 2mm on each side? The PCB layout for the amp, which is placed at the bottom of this 80mm diameter roll-up is specified to be 63.5m. What is the correct diameter and how much does it matter to use a tube of e.g. 82mm instead of 80mm when building the antenna?

Awesome, thank you very much!

Hi, I'm a newbie in electronic construction, but I would like to take up a challenge and build this antenna. I would like ask a few question about OK3ZB ARA-2000 LNA: - is there any filter in this implementation? - how this LNA is supplied (I suppose that any LNA needs power supply to work) - My RTL/SDR dongle (DX Patrol Mk3) does not feed power to coaxial so I need Bias-T device: which one will be best? Best regards! LukiD

Thanks for the information

Hi Chrono, How would I go about up loading a .pdf file?

an extremely interesting article

Great job, Dave. Thanks a lot for it, I'm sure more people will appreciate it when they replicate their own. I will try to make a video of it and will get you the youtube link soon. :)

Great website … will use this site again in the future THANK YOU !!!! Greetings from Germany