This is my first video filmed using my spiffy new Sony a7 IV camera, so there are some dodgy bits of focus and a weirder-then-weird dropouts on audio. After some fiddling, I found the root cause. Machining sounds and compressed air blasts sound like wind noise. Wind noise suppression is on by default. Turned it off now. Also the built-in microphone is VERY omnidirectional and picks up my heavy breathing, sniffs and other environmental noises. I'm going to use a directional mic when I'm doing machining shots in the future as there are weird hums and buzzes from contactors and the lights, plus my 100 watt LED flood has a noisy fan that's intrusive. Oh, the joys of being a beginner videographer... Luckily, my youngest granddaughter has a degree in photography and teaches it at a local college, so I've been quizzing her endlessly. (Hi Violet!)
Having an idea, even if it would work doesn't mean you have invented anything, it means you have thought of something. The inventor takes the thoughts and turns them into reality.
Qdos for the Quinn reference. I've been thinking of building one of these for a while (as soon as I get time). In the mid 1990's when I was one of only two amateur operators with 6m band equipment in Hervey Bay (QLD Australia). I was on the approach path to the airport and the phase distortion was REALLY noticeable when an aircraft flew between us.
I first heard/saw aircraft scatter in the mid-1960s on Band III television. We lived under the flight path of the Vulcan bombers from RAF Waddington. Scatter at 10 GHz is usually ridiculously short, but the in-flight refuelling tankers over the North Sea to my east often fly a path which is along the direct line of sight from me to some of the propagation beacon transmitters in the Netherlands and Germany, giving up to 90 seconds of signal with almost zero doppler shift.
I was hoping to get the software installation and config in this one, but I ran out of time after having a lovely visit today from granddaughter and great-granddaughter. It's also 2.30 AM local time and I have to be at work in six hours so I must get to bed. The receive setup is the colinear into an RTL-SDR and Raspberry Pi 3 running a custom image from OpenSky. It connects over ethernet into my home LAN. I've done a little iptables NAT trickery and added a netsh portproxy on my Windows machine to get round a software bug in the prediction software which is expecting a local dump1090 instance and refuses to work with a remote IP device. The NAT has to be there to publish the dump1090 service on port 30005 as it's bound only to the loopback instead of the ethernet so isn't routable. Computers. Yuk
@@MachiningandMicrowaves also, this antenna is a collinear type? What's the radiation pattern? To receive signals from up in the sky one would think that a collinear would make the takeoff angle pretty low
@@MachiningandMicrowaves so if I understand correctly, dump1090 is the ads-b decoder and runs on the Raspberry, reading data out of the rtlsdr and presenting it to the network. The prediction software however is a (closed source?) MS window program, that only wants a local source for dump1090. My instinct would try to solve that in user space with ssh -R, but while I am confident it'd work for Unix systems, I don't know how well it would work on windows. The reason you have a Raspberry in the loop is merely due to the fact you don't want the RF line to be too long in order to reach your PC?
@@AlessioSangalli Great-granddaughter, soon to be joined by a second great-grandchild. My seven grandchildren are in their mid to late 20s. Some of my stepchildren are almost my age. I might be able to retire in a few years. Caroline was 20 years older than me, and came with a ready-made set of offspring. Her previous husband was born in 1918. "It's complicated"
I've not heard it by aircraft scatter much, but I've had some very good rainscatter returns from it. It has one heck of a good antenna site on top of that giant concrete monolith. There's an awful lot of Wales in the way between me and RPE, plus a lot of mud and rock in Derbyshire/Staffordshire to get over. 311 km over a highly-obstructed path on 10 GHz www.beaconspot.uk/beaconc.php?beaconcall=GB3RPE
@@MachiningandMicrowaves It would be even better if the concrete monolith wasn't in the bottom of our Welsh valleys and I wasn't in the bottom of a different one
@Tim Clark I work Clive GW4MBS now and then on 10GHz and he's in IO71XW in a hole in the ground. Also heard him on aircraft scatter but it would need a fast mode to make a contact with only 2-3 second reflection peaks. Maybe JT9F-fast at 15 seconds per transmission?
I seem to have gathered quite a few from ebay, from 6 mm up to 50mm, mix of Mitutoyo, Bowers, Tesa, Oxford and SPI. Some are a little battered, but with a good selection of gauge rings I can get very close fits with them. I use Starrett telescopics for anything over 50 mm
Dumb thought with regards to the unsupported cable- could you make a delron (or similar plastic) plug a bit smaller than the ID of the mast, fix it to the cable, and then run a set-screw or two through the mast at a pre-determined height to secure it?
I think the simplest fix is to weave a four-strand sinnet plait into a finger-trap. I'm a basketmaker in another existence so that's an easy job. then just tie that to a bolt or loop. Then maybe use some closed-cell foam disks with a hole and push them up the inside of the mast to give a bit of lateral support. Main thing is to avoid pulling the braid/foil or inner conductor out of the N connector while also avoiding the ding-ding-ding so beloved of folks who live in a marina.
Drilling into a round surface with no spotface or even spotting drill, plus running your edge finder and tap in a drill chuck, I'm surprised AIMEE didn't give you any lip. Also, when we had our spot drilling discussion on Discord a week or two ago I did find in my Machinery's Handbook that you should always start with a spot or center drill when drilling on the lathe. No mention of spot size of course.
Heh heh, I have a feeling that the friction edge finder will compensate for runout in the chuck. No defence for using a tap in the chuck, that was just laziness. Most of my drills are ground to a split point so they start themselves pretty well even on round workp;ieces. My father taught hor to grind those split points when I was knee-high to a grasshopper. He retrained as a tool and cutter grinder after many years working on turret lathes and mills in a gas turbine plant. I hope Brother Taps might do a vid about the best size for a spot relative to the size and angle of a drill. I used a 3mm carbide spot drill in my latest vid, using a 2mm spot for a 3.3 mm drill and a 3mm spot for a 5.0 mm and they appeared to stay spot on track.
@@MachiningandMicrowaves I would love to learn how to grind a split point. I just do some web thinning if the drill is big enough that I think I can get away with it, and hope I don't make things worse. I don't have all that much experience sharpening twist drills, so it's always a learning experience.
I have a couple of ideas from doing similar setups on other antennas. It's tricky with foam insulated cable with a foil sheath as it's easy to damage the cable, but a spider that clamps to the cable and rests on a ledge inside the tube might be the simplest way. It needs to be loose so I can remove the antenna if necessary. Quick and dirty solution is to fill the tube with poly building foam, but that's a bit permanent!
@@MachiningandMicrowaves I don't know how much support you'd need, but I can see that the moment you fixed the cable permanently you would need access. 🙃 If crushing the cable or foil is the issue maybe a C shaped collar of ensolite or other resilient closed cell foam could grasp the feed when pushed inside? Don't mind me. I'm just another screwball enthusiast who really enjoys your mix of machining and sarcasm.
@@nbtmx1 Other good things about using foam are that it stops condensation form diurnal pumping and stops the ding ding ding as the mast moves in the wind and the cable slaps the inside of the tube.
Great, as always. A grippy split rubber ferrule could support the coax from the bottom end of the mast, making the coax slack a bit, spiraling along the inside surface. Hair brain idea, but I heard comments are helpful for a channel, even worthless ones.
That is actually right on the money. Plan is to fit an internal collar in the tube about 50 cm down, then fit a compression gland to a disk of Delrin, leaving 51cm of feeder above it, and form a loose spiral with the slack.
I change methods depending how I'm feeling. I didn't know the exact dimension as I only set the parting tool by eye, so I had to measure it carefully. Often I use a chuck spider to space the part away from the chuck, then I can use the parallels of that tool as my datum for measurement. There's probably lots of wrong ways to do it. If I can fit in a hub micrometer, I use that when the linear dimension really REALLY matters
@@MachiningandMicrowaves Definitely nothing wrong with your methods, they get the job done and I'd say very well at that. I see Adam (Abom79) doing the same thing all the time. You just happened to be the one I'd ask 😄 Most of the milling I do is CNC so I'm certain that has a lot to do with why I only touch off on one side 90% of the time. Keep up the good work, always enjoy your videos!
The actual first was from a spammer offering rather eye-watering services from a nice young lady. At least I think that's what it said. Google Translate was blushing a bit and some nuances were absent from the English version I think. It was trapped by the spambot as usual though
