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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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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.
16 posts and 31 image replies omitted. Click reply to view.
Post last edited at

 No.619

>>611

Go for it. What's the worst that could happen?




File: 1432342355218.jpg (43.19 KB, 500x340, 25:17, 1335122230936.jpg)

 No.321[Reply]

So I happened along something today, apparently 14.313 has a reputation for being full of shitty and unlicensed operators, cranks, and shitty cranks.

Plug the number into google and the first few pages are full of nothing but reports of these kinds.

Apparently there's a russian guy in Canada, VE1KFM, who's known for being either completely nutty or a complete troll, not sure which. The USA hams hate him, and he's technically broken all the regs, but Canada refuses to do anything about the guy.

Google that call, and you'll see even more reports and some pretty humorous recordings.

Anyone else ever heard things about or on this freq?

26 posts and 5 image replies omitted. Click reply to view.
Post last edited at

 No.610

>>607

Hah.

I know more pirates that are hams then not.

Yet to meet a ham who does not routinely broadband his rigs.

Those who use them out of band are less common, but many do.


 No.612

You fags are so far up your own asses it's hilarious. Some guys are having fun on the airwaves and everyone's so anally devastated that he said H - E - double hockey stick. Grow the fuck up, stop bitching, and use your fat sweaty fingers to turn the dial to another frequency


 No.616

File: 1455414387249.gif (1.43 MB, 400x254, 200:127, E8dR7VC.gif)

>>612

Thing is… they don't even sound like they're having fun.


 No.631

you know, for some odd reason, with my radio, I've never been able to pick up anyone on 14.313, are the signals too weak for my portable antenna? or do I just have bad timing?

but when listening to 27.025 however, I get plenty of chaos there, particularly around 0200 onwards.


 No.635

>>631

I go on 27.025 and I just hear weird beeps




File: 1455379531728-0.jpg (824.31 KB, 5144x1298, 2572:649, Ot7xFOV.jpg)

File: 1455379531728-1.jpg (178.32 KB, 543x936, 181:312, 1454792869881-0.jpg)

File: 1455379531728-2.jpg (6.11 KB, 255x188, 255:188, 1454792869881-1.jpg)

 No.613[Reply]

Does anyone here know anything about these images?

apparently they were received by a radio operator (Dr Prutchi) attempting to bounce signal off the moon. His gear was just set up for this in 2008. He was apparently involved in Project ARGUS which is crowd operated SETI programme. The image dates back about 2 years. An image search lead to a few forums abut never really settled as to whether it was legit or not.

I don't know whether this is a hoax or not.

I'll save you some time, the math is in base 6 and positional.

so:

/ is1

^ is 2

[/] is 7

[^] is 8

^[] is 12

^[/] is 13

/[][] is 36

/[/][] is 42

/[/][/] is 43

/[/][^] is 44

^[][] is 72

Apparently this came from an audio file converted with SoX. other people later did image manipulation to clean up the pictures.

its mostly just maths equations

'A' =

'–|' +

'–N' -

'F|' *

'>>' /

the last part of image is supposedly a picture of the aliens who sent the signal. and they have 6 finger so base 6 makes some sense.

curiously there is very little higher math which you might expect. there may be indications of primes —- may mean this.

one equation is half missing which may be indicating 31 as a prime.

the large rectangle at the end is about 800 x 150 the dark circles are 60. i believe inside it a geometric proof, it is indicating a calculation of similar to sqrt(2) = 305.47/216

the approximation they use is:

Post too long. Click here to view the full text.
1 post omitted. Click reply to view.

 No.615

>>614

I'd like to concur with 614. I'd assume it's either the author fucking about or someone getting their rocks off.


 No.617

File: 1455417871504.mp4 (6.98 MB, 854x480, 427:240, 1454746197891.mp4)

>>614

>>615

So anything more concrete than that? Anything obvious to confirm or deny it?

Audio found.


 No.618

File: 1455418008351.png (1.15 MB, 2984x1848, 373:231, fermi paradox.png)

>>614

>>615

So this is why we are not getting any messages back?


 No.620

>>618

I'm pretty sure radio signals spread out over distance. Even with super sensitive equipment I would expect the signal to be more mal-formed. The aliums would have had to have a transmitter very close, or be broadcasting with ridiculous amounts of power.


 No.634

File: 1458162132818.jpg (Spoiler Image, 183.04 KB, 749x377, 749:377, gqrx.jpg)

aliens are real




File: 1457976118344.jpg (43.57 KB, 750x408, 125:68, radioshack-htx-10[1].jpg)

 No.632[Reply]

Finally going to use the General privileges of my license, had it since August 2014 and no I'm going to use it. I picked up a Radio Shack HTX-10 it was a decent price and it'll get my feet wet. Still waiting for it to be shipped, but I'm already planning for it. Already built a 10m dipole, don't need to do much of anything to get it hung at about 21' E-W horizontally, however, N-S, might have to go inverted V. I have an SWR meter/matcher that supposedly does 10m-60m, Even rigged an only CB whip to give that a shot, need the radio before cutting.

Here's my problem, I'm interested in digital modes. Sure I might be able buy something that could work, but I'd rather build.

Anyone know of any good plans to build a digital interface for the radio?

 No.633

kenwood ts 480 owners manual has a diagram showing how to build an interface from a few resistors, the you'll have to look up cbtricks.com for the mic wiring to match your rig. I'd just pick up an isolation transformer from ebay though. digimodes is very prone to rf on the audio.




File: 1457335227096.jpeg (215.25 KB, 907x1355, 907:1355, image.jpeg)

 No.627[Reply]

Pray tell oh hams, WTF is going on here??

 No.629

>>627

Natual selection at its best.


 No.630

>>629

Yep. Some fool will fry.

You get horrific RFI near powerlines anyway.




File: 1452159835980.png (845.68 KB, 1728x1340, 432:335, Schermafbeelding 2016-01-0….png)

 No.602[Reply]

Heya /hamradio/

So I fucked up. I blew out the charging base of my ((Baofeng(Please see sticky for more information on this radio))(Please see sticky for more information on this radio)) HAM radio with 12 volts, when it needed 10 volts.

I already bought a new one a while back, but I'm wondering if I could fix the old one with a new lithium charging board.

The battery pack is 8.4v, so I went to eBay and searched for a 2 series lithium charging board. All I could find however are these boards that have a balancing pad that goes between the 2 cells. The battery nor the base have a 3rd terminal, so it's just a postive and a negative going in.

Could I still use that board to safely charge the battery? It also doesn't have an indicator light when it's full so that's also something I'm worrying about. ( I could just calculate the approximate charging time but I'm not too fond of that method)

My new charger base also stops charging when it's 8.2 volts instead of 8.4, which pisses me off a bit since I'm not getting a 100% charge. Could I fix this as well? I don't want to buy a new one *again* just because this one is kinda DOA. I still use it though, and I should have noticed it earlier and disputed it with the seller back then. Don't want to do a paypal claim because I think that's a bit unethical.

Pic related of the charging board and info. What would be the correct input voltage for that board?

 No.628

>>602

that's not a charging board, it is just a protection board to prevent fires. you need something like this http://www.batteryspace.com/Internal-Smart-Charge-Module-1.2A-for-7.4V-Li-ion-Rechargeable-Battery.aspx




File: 1456675339628-0.jpg (241.93 KB, 1273x935, 1273:935, 20160228-074520-ccarc1.jpg)

File: 1456675339649-1.jpg (312.17 KB, 1271x913, 1271:913, 20160228-074154-ccarc2.jpg)

File: 1456675339669-2.jpg (256.83 KB, 1314x919, 1314:919, 20160228-072356-ccarc3.jpg)

File: 1456675339669-3.jpg (383.58 KB, 860x800, 43:40, 20160228-185932-ccarc-halu.jpg)

 No.622[Reply]

Every year at this time, for like the last 60 years, there's been the biggest Amateur Radio event in the Southern Hemisphere, held on the Central Coast of NSW, Australia.

I'm not licenced, but at least I can make good use of the carpark flea market… The weather was great this year (it didn't rain like it had for the past 3..) and the stall turn-out was the best I've ever seen it.

 No.623

>622

Is that last image your haul? Impressive assortment. Also, that white boat anchor in the first pic is fucking magnificent.


 No.624

>Is that last image your haul?

Yep. Unfortunately, I fucked that ASUS W5F (upgradable!) laptop less than 24 hours after I got it– I was testing what voltage was needed to get the recharger going, and got the polarity wrong. https://8ch.net/tech/res/533549.html .. It'll at least be an easy fix if I can find out the component which blew.

> Impressive assortment. Also, that white boat anchor in the first pic is fucking magnificent.

Very. And the prices they were asking were very very reasonable for restorations – although I did hear them be selective, making sure the pieces went to an enthusiasts. (Cool!) .. I thought about getting the signal generator on the end ($100), but I really need a frequency counter.


 No.625

Thank you for sharing!


 No.626

>>625

What the fuck? You don't say shit like that on chans.




File: 1448302293194.jpg (83.75 KB, 562x441, 562:441, QRP-Pixie-CW-DIY-Kit-a-sim….jpg)

 No.566[Reply]

Well, I'm deciding to take a dive into making my own radio, I figured I start with a kit. Not only that, but I'm going to attempt to learn Morse. I have a General ticket, with I'm planning on upgrading once I get the hang of it.

Now, does anyone have any experience with with Pixie kits? Any tips on construction? Common problems to watch out for?

Also, what are some good resources for learning Morse? Anything including audio or even written based learning. Any tips for learning? Maybe even key building resources?

I may be a no-code ham, but at least I'm willing to try.

10 posts omitted. Click reply to view.

 No.587

>>586

Use a good power supply for it. The LM386 audio amplifier might be oscillating. A weak power supply can do it.


 No.596

I bought a couple Chinese kits last month, a Pixie and a Frog Sounds (both on 40m). I can say that the Pixie works fine for such a simple rig, and receives plenty with just my 2.5m magloop, but my 20m Rockmite wipes the floor with it. The Frog Sounds receiver seems to perform about as well as my Rockmite (though they're on different bands, so I can't do an A/B comparison). Also the Frog Sounds puts out 3 watts to the Rockmite's 0.5 and Pixie's 0.1, so there's that.

If you like building cheapo kits and want something beyond babby's first cw trx, go grab a Frog Sounds. Fun little radio. (Side note, the winding numbers for the toroids are wrong in the manual - look at the reviews on Banggood for the correct ones)

>>567

Second this. Go get a 8AA battery holder and power it from that.


 No.598

>>575

True. I might just invest in an SWR meter and go build my own backpacking-style yagi antenna instead of going HF.

Would you recommend UHF or VHF for those distances?

I think I'd still prefer HF though. It might be a bit harder to operate but with detailed instructions and practicing the deployment a couple times I think I'd achieve better results than a ((Baofeng(Please see sticky for more information on this radio))(Please see sticky for more information on this radio)).

>>596

Yeah I found out about those 40m Rockmite clones just today. 5-8 watts at 12V, that's pretty nice!

If I build the transmitter + keyer in an enclosure and have it a the center of the dipole, would I still need a balun? Or is that only when you have a feedline?


 No.600

>>598

A balun isn't necessary at power levels like these, feedline or not, as long as it's close to resonant in the first place. It's not strictly "best practice", but you'll be absolutely fine. It'd be a different story if you were running 100W into it, though.

I mentioned magloop antennas earlier; you may want to look into building one of those. I built one recently, and for about $40 worth of parts you can make a really nice portable antenna. (3.8m DRF-400, 2x SO-239 and 2x PL-259 from Universal Radio, a 566pF capacitor from Mike's Electronic Parts, a project box from eBay, and some wire and RG-58 to feed it, plus $5 of PVC parts for the stand)


 No.621

"Making the Pixie QRP transceiver kit slightly less appalling"

https://www.youtube.com/watch?v=roAc4c1a-a0

VK3YE Really knows his shit and is a qrp operator, so hes words are worth something on the subject.

One of my pixies has those switches for two crystals.

In my case it's the stock 7.023MHz and 7.040MHz. But yet to add an VXO.

When (if) I stuff it in a proper case I'll take some pix for you folks.




File: 1443528975659.png (8.44 KB, 739x66, 739:66, decrypt.PNG)

 No.484[Reply]

Hi @ all

First of all - sorry because of my bad English - i´m Austrian :P

For a few weeks i´m trying to gain insight into the world of SDR. Now i located a POCSAG signal BUT the messages are encrypted (you can see it on the pic). Is there a way to decrypt dem without knowing the key? Thank you for your answers.

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

 No.576

>>484

Same country, same name, same interests…


 No.601

So, it's for Brittish mail carriers?


 No.603

>>601

Where I'm at, everybody with a pager, and some automatic sensors, use either POCSAG or FLEX, and most of the transmissions are not encrypted.


 No.608

>>484

What's your setup OP?


 No.609

File: 1455112966853.png (76.82 KB, 930x650, 93:65, pager.PNG)

I use SDR# and PDW Pager

(GiXa Technology Stick - Chip RTL2832U, Tuner R820T)




File: 1452607451641.jpg (30.45 KB, 513x641, 513:641, 1tnhu0r0.vichan.jpg)

 No.604[Reply]

My sister spilled milk on some electronics, and after looking at the board, i can see a few components clearly burnt out.

They are marked C76 for example, which i suppose stands for capacitor, but I don't know what rating etc.

- Is there a way i can identify and replace burnt out components?

-Do you think it makes sense, or is the damage likely to be more serious, and replacing stuff in the spill/burn area wont help.

pic unrel

 No.605

File: 1452668087366.jpg (44.54 KB, 500x500, 1:1, 1448381089475.jpg)

Post high resolution pictures if you want any chance of help.

The only other option is to learn to do it yourself. Download the electronics section from this torrent:

magnet:?xt=urn:btih:0bbfaaf5f469a2bd3d762f6942a302f7014a35e9&dn=Gentoomen%20Library&tr=udp%3A%2F%2Ftracker.ccc.de%3A80&tr=http%3A%2F%2Fannounce.torrentsmd.com%3A6969%2Fannounce&tr=http%3A%2F%2Fannounce.torrentsmd.com%3A8080%2Fannounce.php&tr=http%3A%2F%2Fbttrack.9you.com%2F%3A8080%2Fannounce&tr=http%3A%2F%2Fannounce.torrentsmd.com%3A8080%2Fannounce&tr=http%3A%2F%2Fbitflip.uni.cx%3A6969%2Fannounce




File: 1446020841441.jpg (141.06 KB, 640x426, 320:213, Birds_on_a_Telegraph_Wire.….jpg)

 No.537[Reply]

. - - . . . . - - - - . - . . - - . . . . . . - . .

 No.541

_ . _ . _ _ . _


 No.543

File: 1446236745890.jpg (15.93 KB, 460x258, 230:129, 1444975161386.jpg)

No I don't. But every few weeks I learn a new letter.

http://lcwo.net/

Koch method with faster letters (23WPM) with a slower word speed (15WPM) seems to be best for learning.


 No.545

>>543

http://lcwo.net/transmit

here's a good way to learn letters


 No.557

– -.– -.-. — -.. . .. … … .-.. — .– .- … … …. .. - -… ..- - .. - … … ..- – - …. .. -. –. -…-

.. .— — .-. -.. . .-. . -.. …– -. . .– -.-. .– -..- -.-. …- .-. -.- .. - … … — .. -.. -… . - - . .-. -… .-. ..- … …. ..- .–. –.- ..- .. -.-. -.- …. .. …. ..


 No.599

–. .-. . . - .. -. –. … / ..-. .-. — – / .–. — .-..

…. — .– / – .- -. -.– / — ..-. / -.– — ..- / .- .-.. … — / -… .-. — .– … . / .–. — .-.. ..–..




File: 1450408002131.jpg (2.71 MB, 4032x3024, 4:3, Transceiver.jpg)

 No.588[Reply]

I'm looking to get started with amateur radio. My grandfather was into it, and I inherited some things of his many years ago. Sadly, I wasn't really in a position to pursue the interest at the time, and after any gear I had was put into storage, it was quickly forgotten.

Something sparked my curiosity again, so I went looking through my things to see what equipment I actually had. I may have some other things in storage (it may have been cleared out, I can't depend on my parents to hold this stuff forever), but all I know at the moment is that I had pic related, a Yaesu Transceiver, tucked away in the corner of my garage. I haven't even gotten around to dusting it off yet.

It was (presumably) fully functional when I received it as it was used regularly, but that was many years ago.

I have no idea as to how I should test it. Is there anything I need to do before I plug it in and turn it on? I don't know if the vacuum tubes can go bad, or if I'll do damage to them if I just plug it in.

Oh, I should mention, I'm still unlicensed, and I really don't want the FCC busting down my door.

I plan on studying for the exam over the next few weeks, assuming this transceiver works, of course.

 No.592

Google:

"Ft-101 Service manual"

will tell you what to test for and how to repair it.

and "FT-101 Users manual"

Will tell you the startup procedure.


 No.594

>>592

absolutely this

Unless you have a General class license you'd better only key it up into a dummy load, but you can short-wave listen all you want. You'll need to lurk for a while so you don't sound like a lid anyway.

I strongly suggest reading a lot about antenna theory, it will help you the most as a ham. Fortunately your tube-type rig can be tuned up to drive loads that aren't quite 50 ohms.




File: 1450654576287.jpg (120.89 KB, 840x585, 56:39, Benito.jpg)

 No.589[Reply]

Shalom /hamradio/, I have a few questions regarding a few projects I have going

1:

How badly would a 1/10th inch plexiglass sheath affect the rx of a QFH antenna? I was thinking that I could make a circular radome for one I'm building to keep water out and make it look a bit nicer.

2: Does a steel coupling nut conduct well enough to be the only contact between two SO-239 or BNC connectors, or should I fill the space inside of it with copper wire or something? I need some double ended connectors I'm making to fit within a two inch deep box, and this is the easiest solution I've come up with.

3: What is /hamradio/'s preferred way of elevating an antenna if I can't stick it to my roof, I'm too cheap to buy a mast, and I don't trust any of my trees not to blow over and rip my shit out through my window?

 No.591

File: 1450781129436.png (35.35 KB, 640x400, 8:5, koality.png)

1.)

It's possible it will very slightly detune it in either direction. It won't be much, if at all.

2.) Solder every electrical connection. But, looking at the QFH antenna, I can't see why you would connect rwo connectors?

3.) Buck up and stick it to your roof anyways :^).

Since you're trying sat work you'll want it to be maneuverable. Just aim it out the window.

If your doing local work, just make a 1/4 wave with ground plane. You'd be surprised how many people don't care about antennas.

http://fucimin.altervista.org/en/groundplane.html

Another simple antenna is the slim jim, it has the advantage of having a wider bandwidth http://www.hamuniverse.com/slimjim.html

It's also harder to see.

Picture related

Mount it to a block of wood for the appropriate pitch of the roof. And mount it to the gable of the roof. Paint the wood/ant. the same color as the cable. Staple the coax near the frame of the house. Use spraypaint to change the colour of the coax. Pretty stealth.


 No.593

>>591

I should have mentioned, only my first question involves a OFH antenna, which I'm making for somebody else. Otherwise, I would just put it up myself and not bother with a cover. The reason I want two connectors is for a connector box I'm putting in my window so I can keep holes in my wall to a minimum, and I don't want to put it on my roof since I have a steep roof, and no way to climb it quickly without fucking up the shingles. For the mast, I think I'm just going to buy a modular aluminum one on ebay since they're so cheap, or just make one myself out of aluminum tubes.




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.

1 post omitted. Click reply to view.

 No.581

>>578

Maybe you'd find it easier to get into if you use text modes such as PSK31? You can do it without an SDR, you just need a computer with line in and line out hooked to your transceiver, and a program like fldigi. Depending where you are though it might be hard to find someone else to talk to.


 No.582

Yeah it's weird. I'd like to talk to people, just not the fat dudes locally.


 No.583

>be me

>call CQ

>more dead air than CB in the antarctic

>TFW


 No.584

>>582

Well then either linked repeaters, stuff like echolink/IRLP or get on HF.

Depending on where you live you should be able to get some older HF rig for around 250eur. Bouht my first HF rig for 250eur, it was a Icom IC-731.

It if you are not afraid of tubes, then older hybrid rigs are also quite cheap (hybrid like solid state everything else except the power amplifier). I have heard and seen FT-101's going for 150eur.

Then there's also it building and modifying old equipment.

f op is in the usa and is a tech license holder then some "freeband" or "export" cb with ssb that does 10m might be a fine choice for getting on hf.

Or some older 10m only rig like realistic htx-100.

A friend of mine has had great fun with his 10m rig (he's a former 11m freebander so the thing does 10m) and worked all around the states and south America.

So there are low cost options out there.

>>578

Just call. it only hurts once. If they give you shit then just turn of the radio and do something else for a moment.


 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.




File: 1429479454652.png (182.51 KB, 320x480, 2:3, Screenshot_2015-04-09-17-1….png)

 No.260[Reply]

Let's have a /hamradio/ net!

IRLP reflector: 9221.

Every sunday at:

0300 UTC TIME

Anybody down for this?

 No.335

Bump


 No.535

sounds cool


 No.542

ill try it

see you then


 No.585

File: 1449571180683.jpg (126.94 KB, 640x960, 2:3, rf.jpg)

Bumping again!

Come on down, don't be mic shy.

IRLP reflector: 9221.

Every sunday at:

0300 UTC TIME

See you then!




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