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/hamradio/ - Electronics

For the discussion of electronics, tinkering, radio, amateur radio, and related electromagnetic phenomena and communications.

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Winner of the 53rd Attention-Hungry Games
/d/ - egenerates

August 2018 - 8chan Transparency Report
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File: 1425522766479.jpg (17.21 KB, 240x160, 3:2, man-headphones-configures-….jpg)

 No.180[Reply]

Welcome to /hamradio/

http://8ch.net/hamradio/rules.html

Have an excellent day.

LocalLink:

http://8ch.net/hamradio/

List of some Ham Radio activities:

http://www.qsl.net/w2vtm/hamactivities.html

http://www.arhab.org/

Youtube channels:

https://www.youtube.com/channel/UCPhfct0hwCpv_q6_BVSFsRA

https://www.youtube.com/user/w2aew/videos

Resources:

Component and parts sources:

http://digikey.com

Flat rate shipping. Great for transistors.

http://www.mouser.com

http://www.elexp.com/

^ Good prices on silver mica caps/ 1N34A diodes/ if American.

http://allcan.com/

You can order from a dealer or your local radio shop

http://www.minicircuits.com

Good mixers/ amplfiers/ etc.

Post too long. Click here to view the full text.
24 posts and 37 image replies omitted. Click reply to view.
Post last edited at

 No.991

>>990

Perfect!




File: 1449251026045.jpg (84.96 KB, 471x600, 157:200, shy_dog_by_cajophora.jpg)

 No.578[Reply]

I can't do it! I got my ham ticket. I got my HT. I have a club nearby and they run a net (fat old dudes who put the ham in ham radio).

But I can't speak! I just go real shy. Calling CQ is like freaking me out.

What do? I would prefer HF and try talking to people miles away, but the $$$ of a rig hold me back.

5 posts omitted. Click reply to view.

 No.590

I got my ham ticket just a few days ago and just made my first QSO last night in a net. I was nervous but not so much anymore if you just know that nobody thinks you're such special shit like you think you are. just talk. nobody gives a fuck.


 No.1029

>Spend 9 months getting licenced, getting hardware sorted, hardware working

>learn the EM waves, learn the oscillators, learn the filters, learn the matching

<…and The only local activity is the 4WD Owners chat

Fucking Amateur Radio taking all the fun out of being a Radio Hobbyist. Nothing kills a hobby faster than other people insisting doing things their way.

I just want to generate radio and see that it works, not get caught in a forced conversation with a cashed-up bogan.

15 years ago, my area had a big ATV and packet scene, and that's been completely erased. :/


 No.1034

A "I don't go on air because it's full of fucking retards" whinge.

Last Sunday there was a big Antenna lecture extravaganza about 100 miles away that I'd waited a month to go to, but a few days ago the starter motor in my motorbike exploded. Bugger.

So, I turned on the radio to listen to the local VHF repeater to see if anyone else had plans to attend, so I could beg a lift from them… Instead, I got:

VK2FourWheelDriveOwner: I can'ts upload to youtubes from my smartphones

VK2AdvancedRetiree: Use a computer.

VK2FourWheelDriveOwner: MAHSMARTHPONE!

[30 minutes later]

VK2FourWheelDriveOwner: <…> I'm 20 minutes from my driveway

[later]

VK2FourWheelDriveOwner: I can Echolink from my smartphone

[later]

VK2FourWheelDriveOwner: I'm going through …. <never copied because the retard spent 5 solid minutes to give half a sentence in his Over, repeating himself about 60 times>

[later]

VK2FourWheelDriveOwner: I wants to buy a new smartphone this one don't werk

[later]

VK2FourWheelDriveOwner: cekewcekewcekew <blah> Listening

No fucking way I was going to risk spending ~5 hours in a 4WD with that vegetable if he replied to my request. I stayed home.


 No.1053

You could use a Text-to-speech program.

If anyone asks why you use it, just tell them that you are very shy about your voice.


 No.1054

>>579

>Just say hi. Nothing bad is gonna happen.

Fuck you, Anon. I tried that, and…

…a guy breakered and bitched about someone playing 'silly buggers with the repeater'

…and got into a ragchew with the guy who had attempted to do the QSO with me.

…that went on for about 30 minutes




File: 7568d8e1968384d⋯.jpeg (96.12 KB, 1476x1038, 246:173, download.jpeg)

 No.858[Reply]

Can someone list the pros and cons of

Straight Keys

Bug Keys

Iambic Paddles

6 posts and 6 image replies omitted. Click reply to view.

 No.932

File: 4f5c90789c71d1a⋯.jpg (49.17 KB, 800x800, 1:1, 50300_orig.jpg)

>>929

Ameco bakelite $12 USD. All a straight key is doing is completing a circuit. You can build one yourself if you wanted to.


 No.933

>>932

I have built a few, all are shit.

I'll take a look if I can source that.

Thanks for the suggestion.


 No.934

>>933

I expect the big part of learning Morse is getting the rhythm down, which a properly balanced key helps with, and a thrown-together switch doesn't.

Note also how the 'British'? keys have a spark-guard, and the American-style ones don't. Apparently the subtle difference in key grip and action is what gives the Yanks RSI and had them invent Bugs and the like…


 No.1018

File: 3e010e997035213⋯.jpg (212.2 KB, 1198x768, 599:384, 20180422-123558-morsekey.jpg)

File: 433a3243f7ba202⋯.jpg (276.7 KB, 1024x682, 512:341, 20180424-214015-morse-shop….jpg)

Woo-hoo! /Finally/ got ahold of a cheap straight key – $10 instead of $70+ like everything else.

It's an Australian clone of the British WT8A Mk.2 from WWII, made in South Australia in 1943 .. The knob had a severe butchering, but the 1945 Penny finger guard is a nice touch.

As I expected, it's been a lot easier to get the practice to stick with a proper key.


 No.1051

>>931

Machinist here from /laboratory/; any chance you can post those cad drawings?




File: c8cbe475e6df1e4⋯.png (52.13 KB, 412x248, 103:62, 40meter_coverage.png)

 No.1031[Reply]

This will be the thread for amateur radio schedualed contacts. All modes welcome.

40 meters, SSB anyone?

To make a coverage map:

http://www.voacap.com/area/index.html

 No.1032

Does anyone do FreeDV 700D or 1600?


 No.1033

File: 187e771efef649f⋯.webm (1.42 MB, 854x480, 427:240, 20180617-freedv.webm)

Yay. After a month of trying, I've finally managed to receive a FreeDV transmission …using a cheap SSB radio (AR1780) and random wire, when all but the closest online VK5 SDRs never got a peep.

VK5QI did his weekly FreeDV test retransmission of the WIA broadcast, 7.177 LSB 400W PEP eastwards from South/Middle Australia (towards Sydney, New Zealand). I could /just/ get a signal from Newcastle (1-2 readable words per sentence; a "11" signal report?). The SDRs in Sydney (150 kms south) and Goulburn (another 150 kms south) had nothing, but a ZL KiwiSDR was receiving about the same signal quality as myself. The callbacks seemed to be just VK5, VK3, and one VK2 (who lives on the border of VK3).


 No.1050

File: 57dcaef776dc7c0⋯.jpg (56.79 KB, 540x533, 540:533, 1510804801451.jpg)

>>1033

Digital! Some kind of voodoo!




File: 9ff447026a5d256⋯.jpg (220.89 KB, 964x632, 241:158, article-2527641-1A39278D00….jpg)

 No.1048[Reply]

When the final nuclear war comes, what are you going to do via shortwave? Are you going to mantain Global communications between America-Europe-Asia? Are you gonna sit back and just watch, or will you try to help society rebuild?

 No.1049

>what are you going to do via shortwave?

Shitpost like I've never shitposted before.




File: 891a5a783ef1fab⋯.jpg (104.87 KB, 1080x608, 135:76, y.jpg)

 No.994[Reply]

The Yaesu FT-818

The 8Chan hivemind is sighing at Vertex putting any effort into making a QRP radio for the 21st Century, correct?

- pissweak NiMH internal battery

- no SDRness,

- no 'easy' DSP features like software roofing, instead /still/ requiring that expensive Collins mechanical filter bullshit.

- no USB, either for CAT, or recharging.

I /get/ the belief that superhet radios are Real Radios, but chuck that into the extra-enthusiast market, not as the mainline products of CURRENTYEAR.

5 posts omitted. Click reply to view.

 No.1035

File: 23580983cab8fbc⋯.jpg (687.06 KB, 3872x2592, 121:81, hf_2110-manpack-handles_e2….jpg)

>>994

>- pissweak NiMH internal battery

< NiMH is preferable for operation in cold conditions. Li-Ion blows chunks when it's frozen.

>- no SDRness,

<Does something in this category really need it? Plus, a software-defined receiver would presumably require more power for all the processing, which defeats the point of a lightweight portable HF rig.

>- no 'easy' DSP features like software roofing, instead /still/ requiring that expensive Collins mechanical filter bullshit.

< Again, power consumption.

>- no USB, either for CAT, or recharging.

< Batteries are too high in voltage for USB charging. Plus USB connectors suck, especially in a mobile application.

Nothing beats this radio in features or quality at this price point. The build quality is actually comparable to some of the "real" commercial radios I've worked on - it's not the standard amateur pretty bullshit you find on most modern radios from the big three.

>>1022

It's dirt fucking cheap for what you get. Picture related is easily $3,000+ in "Ham Friendly" configuration, and it's much larger and only does HF.


 No.1038

>>1035

> NiMH is preferable for operation in cold conditions. Li-Ion blows chunks when it's frozen.

Neither are any good around my place, where it pushes towards 50C during Summer. Everyone's putting DIY battery packs in them anyway.

>>- no SDRness,

>Plus, a software-defined receiver would presumably require more power for all the processing, which defeats the point of a lightweight portable HF rig.

Tell everyone the 817/818's receive power consumption. It's among the worse around in its category.

DSPs/PRUs doing direct conversion need easily a 1/25th the power of a regular double-superhet. It also makes the hardware a lot simpler and cheaper. (Of course though if Vertex did make a FT-SDR for about $150-cost, they'd still sell it at the ~$1000 mark..)

>> no USB, either for CAT, or recharging.

> Batteries are too high in voltage for USB charging. Plus USB connectors suck, especially in a mobile application.

As much as the fucking worthless RJ45? And 4 billion mobile phones beg to disagree, too. USB CAT/10h-charge-through-a-buck-converter isn't going to interfere with its mobile use.


 No.1039

>>1038

>Everyone's putting DIY battery packs in them anyway.

So why does it matter then? A Li-Ion pack in that form factor will probably cost twice as much, and you're already bitching about the price.

>Tell everyone the 817/818's receive power consumption. It's among the worse around in its category.

First tell me what figure you're using and how it's measured. Receiving with maximum audio power out? Squelched? Band? Mode? Input signal? Lights on or off?

Also, what else out there is in it's category? As far as I know, nobody else makes an all-amateur-band, all-analog-mode portable.

>DSPs/PRUs doing direct conversion need easily a 1/25th the power of a regular double-superhet. It also makes the hardware a lot simpler and cheaper.

I'm going to need sources on this. Software-Defined RF (the implicit definition of SDR that you're using) transceivers trade RF hardware complexity for overall system complexity, and are almost always more expensive than an equivalent-performance conventional design, excluding meme features.

>As much as the fucking worthless RJ45?

At least an RJ45 is a latching connector and easily repaired/replaced.

>And 4 billion mobile phones beg to disagree, too.

Four billion throw-away consumer devices sold for a tenth the cost is a really solid argument.

>USB CAT/10h-charge-through-a-buck-converter isn't going to interfere with its mobile use.

Ah, yes. Let's put a noise generator in the same metal can as a sensitive receiver. Surely this will have no unintended consequences! Let's also ignore all the drawbacks of USB connections in general at high fPost too long. Click here to view the full text.


 No.1040

>>1039

>>Tell everyone the 817/818's receive power consumption. It's among the worse around in its category.

>First tell me what figure you're using and how it's measured.

No, you have to go to a website reviewing the FT-817/817 yourself and post it here. What? You don't want to be made to post "Sorry, I was lying and denying facts, because I'm one of those incel flakes who hangs out on 'Dolf worshipping websights."

As it's obvious you need hand-holding, I'll help out a bit: https://www.google.com/search?q=ft+817+receive+power+consumption

>I'm going to need sources on this.

Every USB2 RTL-SDR dongle ever made, fuck.

(This is were you go "hurr they has like 2 bits resolutions")


 No.1047

>>1040

Holy shit you're clueless.

From the very first fucking link:

<…Even though it pulls roughly 300 milliamps when sitting idle on receive, this is certainly less than most any other full-featured HF transceiver that you'll likely find. (Yeah, yeah, I'm sure you can come up with an exception or three, but I did say "most.")…

<…There are also a number of mode/band/option selections that can significantly affect current consumption. Below is a list of various parameters that can affect current consumption…

<…Display backlight: 27 milliamps, regardless of color….

<…Rear antenna: 20 milliamps of additional current is consumed when the rear antenna connector is selected owing to the relay being energized…

<…When squelched, current consumption reduces by between 9 and 11 milliamps, depending on band and mode…

<…Next to the radio just being on, the audio amplifier can be one of the largest factors affecting current consumption, and minimum volume is the best way to reduce this current. Current may be further reduced by using headphones instead of the internal speaker. This current saving can easily average between 10 and 20% when listening on a noisy HF band…

>USB2 RTL-SDR

Yes, because a muntzed-as-fuck over-the-air TV reciever that can be badly hacked into a lousy wide-band receiver when connected to a massive power-hungry computer that it absolutely relies on for all signal processing is a perfectly valid competitor to a compact, high-performance, station-in-a-pouch transceiver.




File: 1445482990136.jpg (99.22 KB, 1410x985, 282:197, 1444965726686.jpg)

 No.530[Reply]

Are you brave enough to dox yourself and give out your call sign?

27 posts and 2 image replies omitted. Click reply to view.

 No.1028

KE7TXZ,quietsurvivalist.com


 No.1037

>>530

K4PSB @ libertyandlead2.blogspot.ca


 No.1041

N0PE


 No.1045

W6DJL - DX Legend

T!

Mojave Desert, California USA


 No.1046

>>740

Happy B-Day




File: 8251a8ce5a10682⋯.png (302.66 KB, 416x363, 416:363, AlphaVirgin.png)

 No.1044[Reply]

Hi there, gonna study up and take HAM test soon but, how do you figure out what to buy first to get started ? seems like there's so many different radios and stuff over whelmed,,,



File: 3653e8bc3dc7aff⋯.png (257.58 KB, 699x750, 233:250, RBS0Wya.png)

 No.750[Reply]

Let this be the Ham jokes thread (aka an excuse for me to post this)

2 posts omitted. Click reply to view.

 No.802

File: 67692e6207b82af⋯.jpg (77.13 KB, 840x960, 7:8, Frank Klaasen-C7-66evWkAAO….jpg)


 No.823


 No.851


 No.958

File: 26a69dba849c94a⋯.gif (822.05 KB, 320x240, 4:3, 5828BA82-4A67-4C2B-B502-1F….gif)

>>802

Fantastic.


 No.1042

File: 5715f5e7935ff1b⋯.jpg (23.73 KB, 306x423, 34:47, article-0-0F13C43300000578….jpg)

Studying for the Aussie Advanced Licence, and I have needs to remember how the callsign allocation is done.

Foundations: VKxFxxx – as already well-aware…

Standards: VKxHxx, VKxLxx, VKxMxx, VKxNxx, VKxPxx, and VKxVxx.

Advanced: almost everything else (except VKxQxx, VKxRxx, and a few other little ranges).

What a mess. At least I was able to make a joke out of it…

"Heavy Ladies Must Not Poledance Vigorously"




File: d3b19ef2b7f29de⋯.jpg (171.13 KB, 1184x1500, 296:375, 81 s5VwqdQL._SL1500_.jpg)

 No.962[Reply]

How is the baofeng UV5RA Radio for getting started, and learning the basics for a Radio Licence? Is there a better one for that price?

I am just expecting to listen to all the frequencies and understand ham radio stuff, not to talk.

and by better, I meant one that you can progress your knowledge quite far with, and or has many features to potentially explore.

Thank you

15 posts and 2 image replies omitted. Click reply to view.

 No.985

https://youtu.be/w_urWSSZgwU?t=30

My hypothesis is that those people who only get an entry level baofeng are less invested in the hobby, and are therefore more likely to put it down.

Just some fuel to stoke the flames. :)

I wonder if there is a way to test this hypothesis?


 No.987

>>984

>>978 claim, not mine.


 No.989

>>985

or just poor


 No.992

>>989

Ya baofeng is a fine entry level rig, when one is aware about it's short comings.

Had a lovely demo on an licensing course.

Wouxun (cheap, but traditional superhet receiver) next to a UV-5R baofeng (with it's low-if DSP receiver) Both on 433.550MHz

And then keying up with a TETRA handheld on 427MHz. Lovely TDMA of the TETRA transmission made the baofeng give out all kinds of funny noises while the wouxun did not.

The 4x in price does mean something.

That does not mean I don't own any boafengs.

I have two of them.


 No.1036

>>962

You get what you pay for. They're cheap. They're questionably legal. They do very little hand-holding. The software and firmware is garbage. Performance blows and is almost always worse than advertised. They fail in bizarre, counter-intuitive ways, and they fail all the time.

There's a difference between a $15 Chinese handheld, a $250 amateur handheld, and an $8,000 professional handheld. If a $15 radio was good enough, nobody would buy the $5,000 radios.




File: 76e6e9bb822bda5⋯.jpg (824.58 KB, 3356x1636, 839:409, fl2k_devices.jpg)

 No.1017[Reply]

 No.1019

What am I look at here?


 No.1020

>>1019

Hyperlinking allows references to other content, providing pointers of a kind to further information. They're followed by clicking the hyperlink with a mouse, or touching its area on the screen.


 No.1024

Exiting stuff for SDR hobbyists.

Can't wait to see what this will result in.


 No.1025

>Hai guise so awesum i'm spoofing GSM!

>lol opensource Stingrays when??

facepalm.bmp


 No.1026

>>1025

At least then there will be proper effort to build protection against them when kids can make 'em for 20usd.

But I don't personally see that as a viable problem.

The current "GSM spoofing" thing for fl2k literally just repeats a prerecorded transmission.

So it looks like a GSM bts, but there is 0% smarts to it and no receiver.




File: 1459826697613.jpg (2.89 MB, 4320x2432, 135:76, IMG_20160404_185414283_HDR.jpg)

 No.640[Reply]

I'm getting my tech. license soon, so I decided to build a 2m (maybe 70cm too) antenna for my ((Baofeng(Please see sticky for more information on this radio))(Please see sticky for more information on this radio)), it consists of 75 ohm RG-59 (supposed to use 50 ohm coax but w/e) and heavy gauge solid copper wire, 2 16" (cut them to 20.5 innastore) long segments from insulator to insulator (pex tubing). I just used eyelets I blued to give the wire stability, and then I soldered the wire to the coax. I haven't really been able to test it, since I am waiting on a coax-BNC adapter to arrive innamail.

I had a question on improving the performance. Would it be beneficial to strip the copper wire, or would the gain be too minimal, making no meaningful difference to such a hodgepodge dipole?

Also, I wrapped the center insulator in electrical tape after I took the picture.

3 posts and 1 image reply omitted. Click reply to view.

 No.1005

File: fb39b3fca6e3be3⋯.png (301.55 KB, 606x733, 606:733, 3976c70d8c1995090f3dad9e01….png)

I made a shitty dipole by wrapping a couple wires onto a banana plug -> F-BNC. I was very excited that my first antenna was able to get perfect reception from the local repeater and NOAA station.

Then I went to unplug the antenna and realized that just pointing the bare coax plug towards the repeater gets me almost the exact same reception. I'm not very good at this hobby.


 No.1006

>>1005

Well you are learning.

That's what we do in this hobby.


 No.1009

>>1005

I can top it– I tried to run the 70cm band through 20 metres of RG58. A mate 10kms away could only just hear me…


 No.1010

>>1009

Hah.

Sene people claim their HF antennas are awesome on 70cm "I get 1:1 VSWR across the whole band"

No shit, you are feeding it with 50meters of RG58.

So don't hit yourself over it, its a common mistake.

On the other hand I have held 70MHz and 145MHz QSO's to approx 12km away with my 80m-10m OCFD, it is fed with HFX50 low loss coax so it's not a pure restive match.

I guess I'm burning the RF to heat at the balun instead of coax and that radiates enough.


 No.1021

File: 70a91c82ff751f7⋯.jpg (112.99 KB, 432x800, 27:50, 20180428-172659-jpole1.jpg)

File: bfe8660a6e3d530⋯.jpg (74.6 KB, 612x800, 153:200, 20180428-180517-jpole2.jpg)

File: b300c076a29e5d8⋯.jpg (235.42 KB, 815x768, 815:768, 20180428-174957-analysier.jpg)

File: f2b06b1d75edccc⋯.png (516.51 KB, 864x1200, 18:25, folding-jpole-1.png)

File: d6c1bbfb4b8f69b⋯.png (385.44 KB, 864x682, 432:341, folding-jpole-2.png)

I bought $40 worth of Copper

…and it actually works!

:D




File: 1411626328857.jpg (64.18 KB, 852x462, 142:77, MyShackInProgress.jpg)

 No.1[Reply]

Post your shacks
38 posts and 26 image replies omitted. Click reply to view.

 No.788

File: b4b4bd0fbb76d9f⋯.jpg (326.76 KB, 1200x800, 3:2, 20170920-092803-aprs-test.jpg)

>>787

>HT

wut wut wut wut wut

I was actually thinking a VX-8DR– but the 5 wuts, and the crap internal TNC support in it, killed the idea. The '7900 just needs a TNC (which an Arduino could do), so when I've decided on whatever big rig to get, this gets a permanent job doing Packet.


 No.793

File: 06e34bff5f4e5f8⋯.jpg (17.05 KB, 394x315, 394:315, 1312026872615.jpg)

>>736

>the tiny little drawers for parts


 No.797

>>217

You put all your stuff in a drawer, gj.


 No.826

>>786

I like it! Keep up the good work.

Nice APRS set up.


 No.1016

File: f53a23b2cd7a282⋯.jpg (377.09 KB, 1147x768, 1147:768, shop8.jpg)

>>724

A little late, but here it is:

http://www.ic.gc.ca/eic/site/025.nsf/eng/h_00040.html

Pdfs are on that page.

Picture kinda related. Not my shack.




File: d066d1137d78d89⋯.png (201.89 KB, 1026x400, 513:200, SDRetard.png)

 No.1011[Reply]

I'm trying to make an SDR setup that can get the best possible reception on HF while simultaneously being something that I can bring with me on travel without having to dedicate much luggage space. It seems the best option would be a Spyverter and a random wire plugged in to either a RTL-SDR or HackRF. Using a SDRPlay would probably be better, but Spyverter doesn't list it as a supported SDR; not sure if it's due to obscurity or actual lack of support.

Obviously I'm going to experiment and figure out what the best setup is, but what's a good way to set up the wire if I can't pack any poles, and may not necessarily have trees around to tie off the wire? I imagine I'd just have two ground wires if I left them sitting around on the ground, right?

 No.1012

>>1011

Just use a web sdr


 No.1013

Or any of those SDRplay devices.

The new ones have built in baluns and filters for using longwires.

High performance at a decent price.


 No.1014

First of all, you don't tie the wire elements to trees. Use guy rope for this. You should also have insulators between the guy rope and wire elements. Your reception will be absolute trash laying the elements on the ground. It needs to be up in the air, preferably as high up as you can get it.

https://www.dxengineering.com/search/department/antennas/brand/alpha-delta/product-line/alpha-delta-antenna-hardware-kits?autoview=SKU&sortby=Default&sortorder=Ascending

You don't have to buy it here, but some kit like this would be well worth it.

https://www.amazon.com/MFJ-270-Lightning-arrester-DC-1GHz-MFJ/dp/B00YFU3F26/ref=sr_1_sc_1?ie=UTF8&qid=1523418053&sr=8-1-spell&keywords=lightening+areestor

Lightning arrester, 10ga ground wire, and short copper rod that you can fit into a backpack will help you get better gain and keep your equipment from getting fried.

You could quite possibly shove all of this shit with a short length of 50 ohm coax inside of a backpack. This would be the best possible reception for travel.

If you don't care about best, a mobile HF whip would do.




File: 1411627176023.jpg (53.69 KB, 563x473, 563:473, diode_prep.jpg)

 No.2[Reply]

Testing out xchan and dumping some optical communications images.
Picture kind of unrelated.
38 posts and 37 image replies omitted. Click reply to view.

 No.998

iikes


 No.1001

Optical coms are cool.

I have been interested in doing cloud scatter WSPR and JT65 with infrared leds.

How's that for a covert channel.


 No.1002

File: 95980cd1999ef36⋯.png (174.2 KB, 1048x1500, 262:375, ar201012-optical-1.png)

File: 6314133dee2ebe4⋯.png (175.55 KB, 1048x1500, 262:375, ar201012-optical-2.png)

File: ed68fcbf3e1a472⋯.png (200.57 KB, 1048x1500, 262:375, ar201012-optical-3.png)

File: ff52fee4dafd384⋯.png (103.39 KB, 1048x1500, 262:375, ar201012-optical-4.png)

I was just reading about this in a hand-me-down copy of AR yesterday…

CDROM burners (not DVD burners) used a ?5W IR laser IIRC.. I'm on the lookup for large A4 Fresnel lenses now..

>How's that for a covert channel.

Them Gungrabbers will still detect your FT817.

(Zero indication of Preppers or the like here in the VK Ham scene.)


 No.1003

File: 54db41d72aad5a0⋯.png (566.54 KB, 1115x1500, 223:300, ar201012-thz.png)

>>1002

In the same issue of the mag.

"474 THz"


 No.1004

>>1002

Maybe 5W peak, for a few microseconds.

But most definitely not 5W CW on near-IR.

50-200mW MAX.

Interesting article, thanks.




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