Activity Stream

Filter
Sort By Time Show
Recent Recent Popular Popular Anytime Anytime Last 24 Hours Last 24 Hours Last 7 Days Last 7 Days Last 30 Days Last 30 Days All All Photos Photos Forum Forums
  • brandon lind's Avatar
    Wed 20th Jan 2021, 23:45
    brandon lind started a thread Close call in The Junk Box
    I've had a Siglent SVA1032x sitting in my cart for 3 days while contemplating my options and today my cart was empty. The site said to contact the company for availability, so i did. The lady I spoke to was completely flustered and had no idea what happened or how long it would take to get more. Did Rigol finally sue them or did the 1032x just go extinct? Telectronics.net had 2 left.
    0 replies | 100 view(s)
  • HFkx3's Avatar
    Sun 17th Jan 2021, 22:06
    Just wanting to make sure I'm not completely wasting my time. I have a elecraft kx3 and this is what I want to do. I plan on making a window pass through using wood. I'll have 16 feet of coax going from radio to coax barrel connector which will connect to a ldg RBA- 4:1 Balun. From there I'll have a long wore probably around 58' long coming out of second story window and tied off to a pole roughly 12' in air. Should I use counterpoise or ground wire as well?
    0 replies | 104 view(s)
  • Tempstar's Avatar
    Sat 16th Jan 2021, 13:19
    Roof eve would be better and let the end hang in an inverted "L" configuration and you should do fine.
    1 replies | 261 view(s)
  • WZ7U's Avatar
    Fri 15th Jan 2021, 21:55
    I'm curious how it ended up going for them....
    9 replies | 3964 view(s)
  • gnuuser's Avatar
    Fri 15th Jan 2021, 03:14
    living out there in mass. i would most likely change the coax and or the antenna both. I suspect with a high probability that its water inclusion and possibly salt corrosion due to close proximity to the ocean. trying to reuse that coax would be a moot point ( even if dried out the damage is already done) clean and tight connections are a must and sealing it from possible moisture issues is paramount (Especially when you live close to any salt water body)
    9 replies | 3964 view(s)
  • Frodge's Avatar
    Wed 13th Jan 2021, 21:19
    Frodge replied to a thread Antenna shaft sections in Antennas
    Thanks for the photos. It makes Everything very clear. Ideally I think it would be better to put a flanged or fluted end on each section like a fuel line.
    11 replies | 500 view(s)
  • gnuuser's Avatar
    Wed 13th Jan 2021, 19:26
    dont be afraid to experiment with old junk parts to see what they do. learning electronics is fun and rewarding when you build something and it works. If it doesnt then you troubleshoot step by step to find out why. Dont be afraid to ask questions but remember google is your friend! building your own equipment gives you a valuable bank of knowledge. also do not transmit until you have your license
    2 replies | 386 view(s)
  • gnuuser's Avatar
    Wed 13th Jan 2021, 19:18
    gnuuser replied to a thread Antenna shaft sections in Antennas
    cut apart a junk antenna to get pics for him It takes two of these shims to keep the shaft centered. its difficult to see but the end of the tube has two small holes drilled into it (crappy web cam)
    11 replies | 500 view(s)
  • WZ7U's Avatar
    Wed 13th Jan 2021, 19:13
    If you are smoking food, how do you keep it lit? :chuncky: In the US, ARRL has some good material. In fact, if you scour the web, there are tons of resources (even YouTube) that are helpful. Some ham (lower case, unless you want to rial up the old timers) websites even have practice tests you can indulge yourself in. Please, don't transmit with your radios until you have a basic understanding of whats going on. Saves everyone a ton of hassle. Welcome aboard to the ridiculously fun hobby of ham radio. Be warned, the rabbit holes are slick and deep. You have a lot of reading ahead of you, fyi.
    2 replies | 386 view(s)
  • Lambjx's Avatar
    Wed 13th Jan 2021, 14:42
    Lambjx started a thread Mobile Radios Propagation 2 em waves in Amateur Radios
    hi guys i'm new to the forum, i don't know i chose the right section. Then I have to transmit the modulated audio signal in AM, without other modulation like SSB or DBB because these are more difficult to demodulate. So my first signal is modulated in AM, then I have to send a second wave that has the same direction and direction as the first signal only more shifted downwards, and therefore through the phenomenon of beating, when the two waves affect the receiver the half waves negative signals of the first signal will be eliminated and a pulsed current will be conducted. But now tell me how I can do this, and if there is any danger that the carrier will be suppressed
    0 replies | 125 view(s)
  • Frodge's Avatar
    Wed 13th Jan 2021, 12:44
    Frodge replied to a thread Antenna shaft sections in Antennas
    I found a photo on the internet of the shims. Iím guessing if I keep my food radios in a room thatís stable this is not as likely to happen. Iíve been using a long wire more often now anyhow. Are most antennas able to be found years later?
    11 replies | 500 view(s)
  • BDub's Avatar
    Wed 13th Jan 2021, 03:04
    Hi All, My previous employer had a HAM radio in one of their buildings and I had no clue what it was. I then recently have been given a couple HAM handheld radios from family for emergency use. Before I was given the HAM radios I had been somewhat interested in getting a CB radio and started researching. After seeing HAM radio pop up in these searches I decided to look into that and I have ended up here. I am from San Diego, CA and my hobbies include lifting weights and smoking food as well as spending time with my family. Some questions I have: 1. What is a good study guide for FCC licensing (I have 0 background in this kind of stuff)? 2. Some literature on protocol (channel use, language etc.)? 3. Anything you experienced folks think will help me out?
    2 replies | 386 view(s)
  • 2E0JTP's Avatar
    Tue 12th Jan 2021, 21:44
    2E0JTP replied to a thread Totally clueless in Introduce yourself
    Until physically visiting local ham clubs/conventions or stores becomes a thing again, the best alternative is YouTube. Find a radio that meets your needs and you like the looks of, then do a YouTube search on the radio. It's as close as you are going to get to seeing it in the flesh, so to speak. You never mentioned which aspect of the hobby interests you. There's a lot to choose from. No radio will let you do everything, so choose wisely.
    5 replies | 598 view(s)
  • brandon lind's Avatar
    Tue 12th Jan 2021, 17:46
    What i am about to suggest, i have not tried. I recommend testing it on a junk antenna first (ive tore all mine apart or i would). What if, a quarter inch from the rolled edge of each section at the top, a mini copper pipe cutter is used to slightly indent the outer tube such that when the antenna is extended, the shims on the bottom of the inner pieces meets the slightly indented part of the outer tubes as a means to make it tighter when extended? Gently as to not cut or crease the tube though. And make sure the sections are not fully extended when you try that so the shims dont get indents. A cheap dull cutter would be ideal.
    11 replies | 500 view(s)
  • gnuuser's Avatar
    Tue 12th Jan 2021, 16:40
    gnuuser replied to a thread Antenna shaft sections in Antennas
    i cant find a picture on the web but as best describes them one tube slides inside another a bit loose, then thin sheets of copper or brass are formed to fit between the inner wall of the lower tube and outer wall of the upper tube, the tubes have small holes drilled in the sides in which a small tab on the shim is inserted (to hold it in place) the shim takes up space and makes it tighter inside the lower tube, the top end of the lower tube is rolled in to stop the shim from pulling out the top. what usually happens is oxidation and corrosion build up on the shims and the stress from friction breaks off the tabs on the shim, once that happens the shim will drop out and the tubes will pull apart easily. Ive replaced numerous portable antennas on radios, older phones, rabbit ears on old tv's and such. while they do work well these antennas are rather cheaply made with very thin tubing.
    11 replies | 500 view(s)
  • brandon lind's Avatar
    Tue 12th Jan 2021, 04:32
    welcome aboard!
    1 replies | 288 view(s)
  • brandon lind's Avatar
    Tue 12th Jan 2021, 03:28
    Mylar doesn't stretch, id have to send it up partially empty. I think I'll stick with a normal balloon. Air has a density of 0.001225g/cm^3 a 2:1 mixture of hydrogen and oxygen obtained from electrolysis has a density of 0.00044g/cm^3 Hydrogen gas alone has a density of 0.0000899g/cm^3 I think i would be sacrificing a heck of a lot of buoyancy going with that 2H₂ + O₂ mixture, so i'll do the math. I intended to use the less dangerous pure H₂ and just get a compressed tank from the welding supply. But lets say for fun we make it with chemistry and not electrolysis... Two baofengs come in at 1 pound. with balloon, nozzle, diplexer and antenna, I anticipate the need for 3lb of buoyancy. Lets call it a 1,500g payload. Air minus Hydrogen = 0.001135g/cm^3 displacement. That's 1,322L of hydrogen, and at STP, 59mol of H₂.
    4 replies | 294 view(s)
  • Frodge's Avatar
    Tue 12th Jan 2021, 00:34
    Frodge replied to a thread Antenna shaft sections in Antennas
    Iím trying to picture the copper shins in the holes. Do they bust off often? Do you have a photo?
    11 replies | 500 view(s)
  • brutus51's Avatar
    Mon 11th Jan 2021, 22:02
    Thanks to Covid getting started in this hobby is a bit challenging. I live in northern Illinois and surprisingly can't seem to find a Ham radio store anywhere in my area, nearest place is in Milwaukee and they are curb side service only for the time being. Spoke with a really nice gentleman there who is sending me some literature but I really want to see first hand some of the equipment.
    5 replies | 598 view(s)
  • gnuuser's Avatar
    Mon 11th Jan 2021, 21:43
    gnuuser replied to a thread Antenna shaft sections in Antennas
    usually there is couple of small copper shims inserted in holes at the bottom of each section that are stopped by the rolled in top edge. if one of these comes apart then the shims have broken off. on the telescoping mast's however there are 3 types of locking mechanism's external set screws, internal twist lock clamps, and compression gland clamps. twist lock type consist of a dick at the bottom of each section that is drilled off center twisting it will cam the disk out and bind inside the lower shaft. compression gland locks squeeze a copper or soft brass ring until it binds tightly against both the inner and outer sections. of the three the set screw types offer the strongest holding power (unless they are stripped out)
    11 replies | 500 view(s)
  • 5B4AJB's Avatar
    Mon 11th Jan 2021, 21:35
    Personally, I would go with metallised Mylar, it's far cheaper and filling it with a mixture of hydrogen and oxygen produced by electrolysis of water from solar power is as free as it gets. You might not want to make this bigger than about 4 space blankets though as the resulting static it will pick up will likely cause self-ignition and may be quite loud at ground level. Sounds like fun. Helium is a rare, finite resource and I can't stand the thought of it being used up, even for science...
    4 replies | 294 view(s)
  • brandon lind's Avatar
    Mon 11th Jan 2021, 19:18
    I don't plan to let it go much higher than a mile or two and would account for expansion. As for gas retention, I do not intend to have it deployed for any more than a few hours at a time, so whether it will stay inflated or not isn't an issue. My singular concern is how many times it can undergo the inflation and deflation process while retaining its integrity. In other words, can I deploy it on 100 different occasions reeling it back in between or will the material fail due to the repeated stretching?
    4 replies | 294 view(s)
  • 5B4AJB's Avatar
    Mon 11th Jan 2021, 18:39
    They usually burst at high altitude due to extreme internal gas pressure, I think they are permeable, so the gas will eventually leak out and not have enough lift. Mylar balloons are not gas permeable and stay up indefinitely, they are also a better radar target. Maybe a couple of survival blankets heat welded together would give you enough lift?
    4 replies | 294 view(s)
  • brandon lind's Avatar
    Mon 11th Jan 2021, 15:36
    I am interested in building a cross-band repeater deployed on a tethered weather balloon for emergency situations where local repeaters may be overwhelmed or non-functioning due to power loss. I plan to install the whole setup in the back of a pickup truck with the tether on a large motor-driven spool. I want to be able to deploy it in a moments notice. My question is this: Does anyone here know, assuming it is never in the air for more than a few hours per deployment, how many times the balloon will be reusable? Do they wear out fast or will I be able to reel it back in and use it a hundred times? 75 bucks is a lot of money if I will wear it out the first few times I test it. All attempts to find this answer online show results pertaining to how long balloons hold their gas ~ which I am not concerned with. I need to know how many times they can be reliably filled up before wearing out and tearing. Thanks!
    4 replies | 294 view(s)
  • Frodge's Avatar
    Mon 11th Jan 2021, 01:21
    Frodge replied to a thread Antenna shaft sections in Antennas
    On a portable radio, how are each of the shafts held together?
    11 replies | 500 view(s)
  • HFkx3's Avatar
    Sun 10th Jan 2021, 19:07
    Hi Everyone! I hope everyone is doing well. Thought I would introduce myself here. I've been out of the hobby for years now so I have a lot of relearning and catching up to do. I'll try not to ask to many dumb questions ;) . I have my extra class license so I have a lot to get caught back up on before I start transmitting again. I just ordered elecraft px3 so I'm excited for that. Need to buy or get components to make a window pass through to connect radio to antenna. Need to figure out what antenna to use (it broke but I was using a par end fedz trail antenna out my second floor window tied off to a telephone pole (under the telephone wire). Not sure if I'll do another end fed antenna or see if wife will let me do a dipole or even using binding posts for a random length antenna and counterpoise.
    1 replies | 288 view(s)
  • Frodge's Avatar
    Sun 10th Jan 2021, 18:56
    Frodge replied to a thread Antenna shaft sections in Antennas
    Thatís weird because some guys I know say theyíve never had a collapsible antenna fail. One of these guys had over 300 radios. Any way to take good care for this not to happen? How about a tight shaft segment. (Not due to corrosion) on a newer radio.....
    11 replies | 500 view(s)
  • HFkx3's Avatar
    Sun 10th Jan 2021, 18:53
    HFkx3 started a thread 20 watt amp for kx3? in Accessories
    Hello everyone, I've been out of the hobby for a while and decided to get back into it. I have a ton of reading to do to get caught back up knowledge wise. I'm looking for a amplifier for my elecraft kx3 radio. I don't have the uhf vhf add on but I do have all the filters and ATU. If I remember correctly the built in ATU can handle up to 20 watts of power. I'd like to be able to operate on all bands from 10-160 but realistically I think I mostly hung out on 20 and 40 meters. I do have soldering iron somewhere and not opposed to a kit as long as it's not overly complicated. If it matters I also operate phone but looking into learning CW. I hope to be around and ask other questions as well. Like I said it's been a while and I don't want to just get on the air and break all the rules or cause interference. Thanks!
    0 replies | 165 view(s)
  • gnuuser's Avatar
    Sun 10th Jan 2021, 17:45
    that looks so cool !
    7 replies | 407 view(s)
  • gnuuser's Avatar
    Sun 10th Jan 2021, 17:15
    gnuuser replied to a thread Antenna shaft sections in Antennas
    quality aside often the ambient temperature can affect the manufacturing process (IE. hotter expands and cooler contracts) an item made in a warm climate will often shrink slightly in a cold climate and can cause unexpected headaches. when you couple the fact that manufacturing machines wear out and or go out of calibration, and quality control sampling may only be checking 1 out of a 1000 collapsible shafts are designed for rapid or easy set up and tear down and the trade off is that the parts will wear out quickly eventually.
    11 replies | 500 view(s)
More Activity