Hello From W1VLF, I am just a guy who has many interests and has done lots of diverse and weird experiments mostly in the electronics area. Such as Laser light and LED light line of sigh and non line of sight communications, machine shop activities
Hi.. Common mode currents, in this case the noise, travel on the outside of the cable. The CMC acts like a resistive element and stops the currents, noise from getting close to your antenna... Yes there is not a connection to the center conductor W1VLF
I'm interested in making one of these specifically to get rid if my own 1460 khz transmitter thats interfering with reception of my primary EAS station on 1030khz, Is this do able? Thanks
Keep up the great work mate 🙏 Based on your schematic You can greatly improve the efficiency of your system by connecting an additional wire between the two capacitors and either running it to an independent ground or into an inductor that has an L value that is far too high for the frequency you are harvesting to get through the inductor. Easiest way is an independent path to ground or to a long wire running along the ground. By adding an escape path between the two Capacitors you provide a path for the current that is forced to go via the diodes & better than simply the path across the Caps & of course the diodes then get to rectify more current.
I've built a 60khz antenna for the MSF signal in the UK, not as long as yours but I didn't have a secondary coil on it. It's 7.6mH with around 925pF cap. Some exciting work to be done. Please keep it up
7:50 Sounds like digital radio transmission. I have digital radios and when you listen on an analog radio at the same frequency you hear this sound. You can also hear it if the antenna is close to a speaker but very faintly (also depends on the type of radio and speaker. The speaker should also be receiving power in standby [without audio])
It's a very good idea~ If the AM broadcast frequency is in the range of 535~1605KHZ, the center frequency is 926KHZ~ If you tune based on this frequency, you won't have to go through the trouble of turning the varicon every time~ And if the receiver's external antenna input impedance is 50 ohm or 75 ohm, it doesn't matter, but if there is no separate external antenna terminal, the impedance is very high (about several K ohms), so you will need a transformer to lower this impedance. Personally, I made an amateur band antenna for 3.5MHz and 7MHz with a 1m long ferrite bar antenna, and it was possible to receive it indoors despite its short length~ I hope you have a fun hobby~^^
Sorry to ask this but maybe you could help me. Back in the analog TV days there was a local TV station in my city that had local news shows and they broadcast from outside the studio in some places around the city, what I discovered is that when you change your TV reception from antenna to cable and tune channel 28 while the news program was on the air you could see and hear what the reporter was doing and talking when he/she wasn't reporting. When the news program finished its transmission this weird signal on cable channel 28 also finished at the same time. Do you know what could that be? Why I could watch that signal on that channel?
Well, when there were the good analog TV signals available in Mexico I remember listening to local news of my local TV channel 6 through 87.7, I didn't know this was possible until I grew up and started to investigate about TV frequencies and more.
Starting at about timestamp 8:10 you can see where the the B force causes the contactor to make a second closure with a smaller spark which discharges additional cap energy into the coil...looks like you are getting some LC oscillation from the cap (C) and coil (L) resonate freq.
According to your total of 6000uF @ 1000v (and if all capacitors are equal V and C) This says that the caps are rated (each) at 500v 15,000uF. since 15,000uF is rather high for blue caps...I was wondering if they are 15,000uF EACH....what is printed on them?? THANKS MUCH!!!
A dab of hot glue to the coin...and it will stick on the puck as-is. Better yet, stick the coin to the wood bottom. ...would be nice to see a puck-only launch! GREAT VIDEO!!!
The site you want to scope out is the Mt Everett reservation in SW MA. Not sure if the fire tower is still there, and I think the road to the top is closed to vehicles, but that is one GREAT location. Of course, that means that one would have to hike to the top, and I know of two people that leaves out 🙂
Hiya Paul. Great job documenting these locations. Not sure if I missed it but folks may want to know if you can have access during the winter. If available in the winter I bet a lot more angles will become available when all the leaves are gone. 73
Not really at this point. The purpose of the video is just to give folks an idea of what is actually available when they are thinking of travelling to this site. Thanks for the question W1VLF
I use this tape for many projects. When it's time to remove, I use a fishing line to skim between the part and the tape to separate the glue, very handy on glass (not to break) or painted parts not to peel the paint. I also find putting many patches instead of a single large continuous patch makes it easier to remove and seems to offer more tolerance to temperature variations. I leave a 2mm gap between the patches.
Hello I am a SDR-beginner and it would be helpful to get some information which Antenna you use to receive the DCF77 Signals. The Clocks that Decode the Time Signal use a Ferrit and some thin wire wrapped around the Ferrit Stick. But I also heard of Loop Antenna used together with SDR-stick with a Stick capable of 77,5 kHz . Could you describe your Setup please.
You may also want to check the resonant frequency of your coil to make sure it is higher than the frequency you are trying to pick up or you will never be able to tune it properly and that is easy to do with a signal generator and scope.
Thank you for the wonderful video!! Could you give the values of capacitances you used and/or the range of the variable capacitor? We are making one for SID Monitoring
I would like you to check something for me. If it is a very good square wave output, it is supposed to be the fundamental and odd harmonics. Check the signal strength of the odd vs. even harmonics. The odds should be much stronger. If they are not, that says that the fundamental is not a really good square wave. I have used TTL devices for markers and other uses. Good thinking.
Excellent investigation ! I switched to using laptops as I couldn't find a way of making my monitors quiet. What is the conclusion ? Best way to supress noise is to tweak monitor orientation to null the noise ? It works but is not always practical ? Anyone have any more ideas ? I wrapped a monitor in chicken wire which worked great (see my channel) but of couse is totally impractical if you want to see what is on the screen ;-)
