WWVB Antenna Part 2
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- Опубліковано 5 жов 2024
- Here is part 2 of the series on building your own WWVB ferrite loop low noise antenna. We wind the coil , explain how the antenna works, define a parts list. Check it out , and please subscribe for part 3 coming soon.
W1VLF
This 16 inch antenna is worth the effort to make. It works better than my 100 foot random wire antenna. Took me about 2 hours to make a hack-version. I used #26 wire and wound the PVC pipe. Put masking tape on the ends of both ferrite rods to build out the diameter enough to snugly press fit inside the PVC pipe - no glue. Resonance at 60 kHz was achieved with 377 pf. I used an electric drill to rotate the PVC pipe during winding. Really impressive performance, reduced noise pick-up, sharp nulls when rotated, sharp peak at 60 kHz, small size.
Always good stuff Paul! I might fire up the lathe today actually . :-) I don't know why I never thought of using my lathe before for winding!
~K3FEF
LOL ... Mike.. Maybe your just not as lazy as me LOL. It was out of necessity. With something like 800 turns.. I thought there must be a better way
I'm as lazy as they come so this is a useful "new" idea for my old Atlas lathe! :-) And of course I just wound a big loading coil for a very short BC AM vertical - by hand. LOL.
you probably dont give a shit but does anyone know a tool to get back into an instagram account..?
I stupidly forgot the login password. I love any assistance you can offer me!
@Jaden Zev instablaster :)
@Kasen Ahmir thanks for your reply. I found the site on google and im in the hacking process atm.
Takes quite some time so I will get back to you later when my account password hopefully is recovered.
Part 3 needs to drop very soon! (The suspense is KILLING me.)
- Curt ~ N6ATC
Just a suggestion. Instead of burying the parts list 3/4 of the way into part 2 of 3, put it at the start of part 1.
Good point noted...Thank you W1VLF
cureous for part 3 gl
Will building one of these finally make my atomic clock be able to pick up a signal and work?
Sir thanks for the antenna.
Where did the sample winding come from?
I keep looking for the parts list and not finding it - specifically what ferrite are you using? Good grief 23:12
Would an ideal be to have a dowel in between the two cores? Pushing them to the ends of the PVC?
You certainly can try that.. I never found it necessary when that expanding glue sets, the cores cant move. I suppose if you made the CPVC pipe way to long you might need to do that.
Will this work with Iron?
Daniel, KQ4GOB
Possibly, but the number of turns would be radically different and the iossed in the iron core would be very high. This is why they laminate Iron cores at 60HZ and it gets worse as you go up in frequency
how does this antenna compare to a loop or a long random wire for AM?
Hi Bill, It does not work on the AM band at all. The antenna is very narrow band, a consequence of a tuned antenna with a high "Q" If you are using an AirSpy.. I routine use a 30 foot circumference untuned loop out in the back yard for low noise AM listening.
Did I miss the description of the ferrite mix?
look at 22:47 there is a parts list
@@W1VLF Mmkay, permeability isn't the ferrite mix but I'll go with it and see what I can find out. I'm guessing it isn't too critical given that the rods are Russian surplus. thanks for getting back to me!
yikes ... Guess I should read your comment more carefully. I am not sure of the mix... I know that these rods work well.. I tried some other mixes #77 and although I could use less turns, the captured signal strength wasn't much better. The cost how ever was like a order of magnitude of or deer more.. I just stuck with the ones I am using now.. There are at least 100 of these antennas out there using this mix.. Good luck
@@W1VLF No worries! It was clear that the ferrite you selected was surplus. After heading over to Fair-Rite and reading a couple white papers I too determined that #77 would be appropriate but as you found the cost didn't make a purchase that mix cost effective.
Thank you for the design. I built mine yesterday and realized that the end caps need to be double-checked to see if they fit inside the 1” tube. Mine didn’t. Oops! It possible best to swap to an internal stopper style end cap and make the 16” tube slightly longer if you have this issue with your local lumber shop have bulky end stops.
Oh … and don’t skimp on the hole size on the end cap, when that glue expands and foams, it really wants a place to escape. I wiped the resulting bubble of foam off three times during the hour++ it took to set. Next up … measure that inductance! Thanks again for the design. - Martin W6LHI/G8LHI
Your WWVB loop stick antenna seems quite a bit easier to assemble than the instructions I found for the Ultima VLF Antenna here: img2.tapuz.co.il/forums/1_120115724.pdf
I'm curious is there a difference in dB gain between your design and the Ultima VLF?
I take it you no longer have time to manufacture these antennas for sale anymore? Thanks