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Jonny 290 posted:
So, always use channel 13 for my home gear, got it.
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Oct 2, 2016 13:35
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wifi channels 1-6 exist in a part of the spectrum shared with the 13 centimeter amateur band. if you stick to "ham radio rules" (ID with your callsign, nothing offensive, no crypto and no for-profit traffic), you are allowed to use up to your license limit, which for all classes in the US is 1500 watts peak power and no limit on antenna gain, which is a bit more than the watt or two you get with 'regular wifi' 
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| # ? May 9, 2024 13:19 |
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Cocoa Crispies posted:shame about the encrypted traffic rule though, basically means you're stuck with websites that don't use https then? And also an open network Stuff could still be cryptographically signed though
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Oct 2, 2016 16:58
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Yep. guys use ssh with no crypto all the time, just for session management and authentication. That's fine. ---- HAMFEST DAY budget: $100 1 absolutely enormous EF Johnson variable cap in good shape. I've seen this exact one at the past 3 hamfests and the guy's dropped it from $30 to $10, and i bit. 40-400 picofarads, 3500 volts. Unf.  sig gen $20  2x fluke bench meters, basic but will be very useful $10/ea  Alinco EPS-120 power supply (it's bigger than this and has binding posts and such) - 20 amps of linear adjustable fan-cooled PSU for $20. Hard to say no to that. and probably my favorite snag  DIP METER! In PERFECT shape. With a fresh 9 volt. And the entire coil set. And manual. I gladly gave the geezer $30 for this. not bad for a benjamin. bench is filling out nicely
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Oct 2, 2016 19:52
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can I be the enormous Johnson
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Oct 2, 2016 21:39
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Latest Tom Scott video has some cool radio stuff: https://www.youtube.com/watch?v=eQEGPATQe5s
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Oct 3, 2016 20:28
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from another thread:Jabor posted:The FCC publishes a bunch of its enforcement actions against people transmitting illegally. https://www.fcc.gov/general/amateur-radio-service-enforcement-actions found a good one already: https://transition.fcc.gov/eb/Orders/2015/DA-15-1438A1.html
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Oct 4, 2016 03:43
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the WARFA net is the ham radio equivalent of a Historically Black college and Crowell (W6WBJ) is a super piece of poo poo troll
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Oct 4, 2016 03:52
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is it intentional that the w5yi header image looks like some white supremacist thing or is it just inadvertant:
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Oct 4, 2016 06:05
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Progressive JPEG posted:is it intentional that the w5yi header image looks like some white supremacist thing or is it just inadvertant: what does ur heart tell u (jesus is just to the right of the picture, and he's got a heathkit)
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Oct 4, 2016 07:29
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Pham Nuwen posted:what does ur heart tell u
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Oct 4, 2016 07:56
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considering dropping $400 on a limesdr, already got a Zynq board that can be hacked to run up to 50Mhz radio but is better used as a lovely oscilloscope also have a cheap-rear end 433.92MHz ASK transmitter that i got to gently caress with my lights and it can control the neighbors' if i tell it to
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Oct 4, 2016 10:17
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how hard is it to get an amateur license in Europe?
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Oct 4, 2016 10:23
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Malcolm XML posted:how hard is it to get an amateur license in Europe? highly dependent on country, there's no one european ham radio license
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Oct 4, 2016 11:45
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Jonny 290 posted:the WARFA net is the ham radio equivalent of a Historically Black college and Crowell (W6WBJ) is a super piece of poo poo troll like, it's a mostly minority radio club?
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Oct 4, 2016 15:49
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maniacdevnull posted:like, it's a mostly minority radio club? 
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Oct 4, 2016 15:54
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pirate radio is good and should be encouraged. play grime, gently caress the police.
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Oct 5, 2016 00:55
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vodkat posted:pirate radio is good and should be encouraged. it wont be the police it will be the feds, and they will take all of your radio and computer like things and you will never get them back and you will lose every license you hold on a federal level that pertains to radio whatsoever
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Oct 5, 2016 00:59
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Sniep posted:it wont be the police only a real dingus runs a pirate station out of their house. Or traceably at all
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Oct 5, 2016 07:04
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hand etching boards out of common pcb material, maybe even using dead bug or point to point wiring on salvaged copper shingle gloves left and right the full time mask and hairnet too mix of chinaboat standard parts and desoldered components from consumer gear basically there's another hobby that has the cleanroom standards you need to pull it off rock solid, follow their ideas. even then if you're using an internet or digital link there are a host of other concerns. probably consider something like a detuned FRS or even broadcast FM - the former better though b/c you can use high gain yagis pretty readily at least one end if not both, latter better if you want a good qual link the more obscure and untraceable your remote link frequency is, the more traceable and unique the radio is. one option is to have no remote link, you can cram a lot on a 2gb sd. again though, traceable serials
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Oct 5, 2016 07:11
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Jonny 290 posted:hand etching boards out of common pcb material, maybe even using dead bug or point to point wiring on salvaged copper shingle used or discarded ipod shuffle and a solderless breadboard
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Oct 5, 2016 07:19
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Sniep posted:it wont be the police a lot of pirates still seem to broadcast, though, aren't there a few really well known/infamous ones or do they only start to really give a poo poo when it's interfering with actual broadcasts instead of some normally silent part of the band
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Oct 5, 2016 18:24
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Zamujasa posted:a lot of pirates still seem to broadcast, though, aren't there a few really well known/infamous ones In parts of the US I know there are some very very lazy FCC officers and if you don't broadcast something they can hear from their hometown and if no one complains they will never actually check even if you are say running a pirate commercial fm station
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Oct 5, 2016 19:32
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great ebay snipe last night: some resistors 1000pcs smm0402 10k 0.1% 15ppm/delta K resistors! checked the mouser cost and they cost about $1 piece if you order 1000 so i picked up around $1k in resistors for about $25 gonna build so many differential amplifiers
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Oct 7, 2016 17:23
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hahaha, nice. I found some 0.01%'s at Electronics Goldmine or something other night, few bucks each. Thinking of picking up a couple for meter cal
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Oct 7, 2016 22:24
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The Ham radio thread in DIY seems to be dead so I thought I should crosspost this here. So, I'm going for an upgrade to General soon. I picked up a WRL Galaxy V transceiver on ebay for $40  And a Heathkit HP-23A power supply that I got locally for $20 to run it. The Galaxy still needs one more 12VDC rail at 1A to make it work. I can do that... The PSU and Transceiver will need a full electronic restoration. I'll post my progress here. ***Three weeks later*** I made some progress on the Galaxy 5 Transceiver. I found a seller on ebay that offered a kit to make a new 6ft interconnect cable for the Heathkit HP-23 Power Supply. I happened to have the correct female 12 pin cinch-jones plug to mate with the Galaxy, it was used as the AC power connector for an early 60's RCA tube CB transceiver i picked up for $2 at a yard sale years ago because it came with a great turner hand mic. Soldered up the the cable and replaced one dried out electrolytic cap in the power supply and this is the result: https://youtu.be/yrOkI1rcOmM  It's still going to need a lot of work. The 10 meter band is dead, from what I can tell it's looking like a dirty or corroded bandswitch. The S meter works during final tuneup but is non-responsive on receive. The radio has some paper caps in the RX and TX sections, and small electrolytic caps in the solid state audio output stage that definitely need to go before I can put it into everyday use. The tuning vernier is full of dried grease and stiffer than it should be, but all in all, I consider this to be pretty good progress for one evening. Edit: I forgot one thing. The 12VDC rail needed to operate the RX/TX relay and transistor audio amplifier for the speaker is being fed by a wall wort from a long dead linksys router. The Heathkit doesn't have a 12vdc rail but there is an unused 6.3V 5A filament winding on the power transformer that I will eventually use to drive a rectifier and voltage doubler to get the 12V 1A I need rather than the janky Linksys hackjob. Here's a couple shots of the vacuum bulbs. Its amazingly compact for a tube rig. These were very popular as HF mobile rigs in the mid to late 60s. This one came with a massive under dash mounting bracket that I will never ever use.  
MullardEL34 fucked around with this message at 09:41 on Oct 11, 2016 |
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Oct 11, 2016 09:23
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welcome and thanks for joining us! Yeah that thread is sleepy, i try to poke it when i can. That's a beautiful rig. I too suspect bandswitch on 10m, though watch out for weirdly positioned or too-long wires - can wreak havoc up here too.
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Oct 11, 2016 09:37
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Jonny 290 posted:welcome and thanks for joining us! Yeah that thread is sleepy, i try to poke it when i can. I have another potential suspect now. The Galaxy uses a couple of crystals that mix with the VFO frequency to derive 15m and 10M. I've had bad crystals in Cb radios and tube color TV sets of the same era. Hmmm... MullardEL34 fucked around with this message at 21:23 on Oct 11, 2016 |
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Oct 11, 2016 09:52
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longview posted:great ebay snipe last night: some resistors reel is here, the two first clocked in at +0.01% and -0.06% using a 4-wire DC offset compenated 6.5 digit measurement not too bad really, for truly critical applications it would still make sense to either match them or add a manual trim. manual trim might make things worse since most trimpots have a lot more than 15ppm/delta K drift though. in that case it would probably be better to accept a pretty good but highly stable matching instead of something that's amazing at room temperature. the setup for trimming that matching would also have to be highly sensitive.
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Oct 12, 2016 17:32
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knowing far less about radios than I should, I have a project that looks like it's targeting the 3cm band... this should be interesting
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Oct 12, 2016 17:36
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Star War Sex Parrot posted:knowing far less about radios than I should, I have a project that looks like it's targeting the 3cm band... Is the project ur dilz?
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Oct 12, 2016 17:43
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Star War Sex Parrot posted:knowing far less about radios than I should, I have a project that looks like it's targeting the 3cm band... microwave poo poo is insane and cool, 10ghz and up 'ham radio' is basically 95% high precision metal shop work and 5% absolute black loving magic
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Oct 13, 2016 00:08
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Jonny 290 posted:microwave poo poo is insane and cool, 10ghz and up 'ham radio' is basically 95% high precision metal shop work and 5% absolute black loving magic
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Oct 13, 2016 04:49
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also watching youtube videos of dudes making their own microwave transceivers is neat
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Oct 13, 2016 04:50
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a lot of the techniques are very strange generally, how to generate microwave RF: generate a lower freq square wave, with a pissload of harmonics, filter out the ones you dont want at microwave freqs you can do this with a pipe cap and a screw, tuned to the harmonic you want.  its super power inefficient. if you need 1 milliwatt of 3ghz RF and the third harmonic of your 1ghz generator is 20db down, you need to pump 100mW in. usually this is worth it though because its easier to make an amplifier for the lower freq and just burn off the rest
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Oct 13, 2016 04:58
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and then there's this guy who built a bunch of 60ghz radio experimentation equipment in india at the turn of the 20th century out of wood and other available materials turns out a book makes a pretty good horizontal polarizer if you shoot beams at the edge of the pages
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Oct 13, 2016 09:48
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Jonny 290 posted:a lot of the techniques are very strange aren't microwave freq synths super cheap due to cell phones
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Oct 13, 2016 12:09
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Malcolm XML posted:aren't microwave freq synths super cheap due to cell phones 1-3 GHz is fairly afforable i guess, but cell phone gear doesn't really go higher than that except for 5 GHz wi-fi. 10 GHz is serious business and unless you can use satellite TV LNBs you're looking at fairly weird stuff like yig oscillators, gunn diodes and strange tubes
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Oct 13, 2016 20:07
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longview posted:1-3 GHz is fairly afforable i guess, but cell phone gear doesn't really go higher than that except for 5 GHz wi-fi. 10 GHz is serious business and unless you can use satellite TV LNBs you're looking at fairly weird stuff like yig oscillators, gunn diodes and strange tubes fairly bitchin' stuff yigs:  couple a yig sphere to a pair of coils and put it in a magnetic field to turn it into a tunable filter from 3-50 ghz  gunns:  diode has negative differential resistance, circuit has positive differential resistance, they cancel out to produce a circuit with zero differential resistance that randomly starts oscillating. give it DC bias and a yig filter and you've got a microwave source weird tubes:       
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Oct 14, 2016 01:53
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yes please let me fire up the ole o-carcinotron. please stand back
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Oct 14, 2016 01:55
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| # ? May 9, 2024 13:19 |
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multistage depressed collector 
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Oct 14, 2016 01:58
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