Build a Dip meter probe : HAM RADIO : COAX Trap

[@G0USL]

A right tidy job Mike, Gonna be building one of those for the analyser here, Yet another great video, 73

[@mike-M0MSN]

Thanks 👍

[@souta95]

Thanks for the video! My local club just had a demonstration last month on how to use a dip meter.

[@mike-M0MSN]

That is awesome!

[@willian.direction6740]

Great project for anyone who wants to test traps. Thanks for sharing.

[@mike-M0MSN]

Thanks for watching!

[@alanthomas8817]

Thanks Mike, recently built this, works great, just need some antenna ideas now to make more coils/traps 😀 👍

[@Steve-GM0HUU]

Good idea, thanks. More advanced than the few turns of wire messy solution that I usually use with my MFJ to check for resonance.

[@mike-M0MSN]

Glad to help

[@acestudioscouk-Ace-G0ACE]

Even I could make one! Thanks Mike.

[@mike-M0MSN]

Go for it!

[@wfwtheradioguy3414]

Nice work Mike, think I'll go build myself one now. Thanks for sharing.

[@mike-M0MSN]

Many thanks!

[@markramsay6399]

Another really interesting video Mike.

[@mike-M0MSN]

Many thanks!

[@DennisSlade-l3b]

Thanks Mike for your vidio, but because of my very bad hearing could not hear everthing you said, so amm I right in thinking that the Red wire has 20 turns and one end soldered to the coax copper core but the other end is soldered to the Woven Copper Shield and the Copper Core, not just the Shield. Thanks, Dennis

[@mike-M0MSN]

yep spot on

[@adelarsen9776]

Hi Mike. Great job overall. You showed the trap was resonant but you didn't show the dip take place. Doesn't matter for me but some new kid might learn more if he/she could see the dip. Keep up the good work. Thanks and cheers :-)

[@mike-M0MSN]

Good point Ade, easy to forget these things when you do it all the time. 👍🍌

[@adelarsen9776]

@@mike-M0MSN It could be your dementia kicking in. Happens to everyone over the age of 60.....

[@adelarsen9776]

@John Cliff Hi John. Folk who pass 60 are basically useless so we just forget about them. What were dinosaurs really like John ?

[@The-Chaos-Shack]

Interesting. I'll look into this and have a play.

[@MeineVideokasetten]

6:24 Nice One

[@dixpears1081]

Thank you Mike 7X2CX

[@mike-M0MSN]

Many thanks!

[@keithpetherick3425]

interesting.. Have been playing with a simple lc circuit and calculating the frequency with a calculator and measuring the frequency with a dip meter which means I have been checking the dip meter frequency with a radio. Get results out which vary about 500 kcs to 1.5 megs out. Have to move the coils quite away apart to only get a slight dip; otherwise the dip meters swing too much in opposite directions. Now I have seen your vid, I shall try to use the 259b so maybe I will see the frequency without having to find it on the radio. Then I think I will put the 259 in parallel with the tuned circuit and oscilloscope to see if I see the highest wave on the oscilloscope, and if it gives me the same frequency as the mfj - if it works. Thanks for the idea. Keith G0odu

[@littlebear5219]

Thank you ? Is it only the mfj 269cm this works with!! Thank Mike

[@mike-M0MSN]

No just about any Antenna analyser with do it

[@martine4607]

I just took a nanoVNA and did it the same way like a filter. I didn't use my MFJ any more, since I have this amazing and cheap device.

[@mike-M0MSN]

yes there are good. : )

[@ukm6yik69]

Great video as always Mike. Just wondering how many times you have cut your thumb with the Stanley knife 😂

[@markramsay6399]

I do have to cover my eyes. That kitchen table would be covered with blood stains if I were doing this.

[@mike-M0MSN]

LOL more times that I can recall, practice makes perfect...

[@billgatewood9578]

Hi Mike, If I have a 33’ wire vertical for 40 meters and want to make it for 80 meters what should my coil read. Haven’t tried doing this yet. Thanks

[@kevinkc3onohelijeepworld953]

Nice iron lighting what iron is it ? Or is the lighting secondary??

[@mike-M0MSN]

Weller 40W LED Soldering Iron

[@Linas_LY2H]

Nice and elegant! I think it would work equally good with any other antenna analyzer/ NanoVNA. 73! Linas LY2H

[@mike-M0MSN]

Yes, you are right, hopefully it should. :)

[@johnnyjohn6527]

we need more vids

[@ErnestGWilsonII]

Thank you for making another great video and sharing it with all of us! I have a couple of questions I'm hoping you can answer please: 1.) When using traps, can we use as many traps as we want and make and EFHW antenna that is 160-10 that is multi-band and works on every single band by using traps at every interval? 2 ) How much power can go through a trap? Is there a way to know that if we built an antenna using a series of traps for a multiband antenna that it could handle 1500 Watts? I am of course subscribed with notifications turned on and thumbs up! 73 W3GUY

[@mike-M0MSN]

You could use a trap for each band but is is not recommended as each trap brings a dB loss ( I think is 2dB per trap). A 49:1 or 64:1 transformer EFHW, will resonate on 20,40,80,160 if it is 80m in length anyway. Also the trap is a low power device unless you use lmr400 or a ptfe based coax like 316.

[@ErnestGWilsonII]

@@mike-M0MSN thank you for the reply! I was wondering how much loss was involved, sounds like traps are not a great plan for multiband. Each road seems to lead me back to EFHW as the solution of choice for HF multiband. 73 W3GUY

[@brendanhynes473]

Premature end there Mike , or did I miss something. De GM0CQV

[@mike-M0MSN]

Not sure, made probe, tested, used it on 40m antenna.

[@brendanhynes473]

@@mike-M0MSN Hi Mike I re watched it and you did as you said, I think perhaps you not speaking saying what was happening, I think I must have been waiting for a verbal conclusion, cheers Brendan de GM0CQV

[@noelbulls8628]

How long does the piece of coax has to be? Can you tell me your diameters? I want to make one for me. Thanks 73 Noel NP4M

[@mike-M0MSN]

15cm its not to important.

[@markg6jvy135]

👍👏👏

[@mike-M0MSN]

Thanks Mark

[@dennisthrush2835]

Thank you for this video. I think I was one of those asking questions about the probe. Now another question, being left handed, I would probably wind the coil in the opposite direction from you. Is the direction the coil is wound in critical?

[@mike-M0MSN]

Good question! and nope. :)

[@YZFoFittie]

What's this used for?

[@mike-M0MSN]

in this case the trap freq...

[@YZFoFittie]

Do you have a link to the other video so I can learn how this is used?

[@johnlees8418]

going to make 1 for sark100 . worth a try

[@mike-M0MSN]

always worth a try. :)

[@johnlees8418]

@@mike-M0MSN i done it and it works also i made 1 that is 2 turned loop :) . building traps now just for sake of it . getting 2 identical is hard . good fun trying

[@TheBrynu]

couldn’t you just put a single loop at the end of coax.

[@mike-M0MSN]

Maybe 2 or 3...

[@DennisSlade-l3b]

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