Thanks for this series of video's Tim. I am learning a lot. Cheers Phil ZL2VTH

@timg5tm941

Жыл бұрын

Thank you Phil! 73

Great job Tim. The cap hat is always more effecient than a loading coil, but most don't emply a cap hat due to mechanical restricions. I advise all to use a cap hat first with an excellent ground radial field, THEN add a coil if needed. This will keep losses to a minimum. It's what we do in AM commercial broadcast when the tower is electrically less than 70 degrees or so. 73 OM.

@timg5tm941

Жыл бұрын

Spot on!! A high Q centre loaded antenna plus cap hat can do very well on 40,80 even 160 just using a short radiator

Excellent presentation. You have filled in the gaps that many of has had

@timg5tm941

Жыл бұрын

Thank you Gil!

Nice! I designed a 3D printed coil a while back and this vide would have been so great to have to better understand why coils are built the way they are! I understand them much better now!

@timg5tm941

Жыл бұрын

Thanks Miles!

Thank you !

Fabulous comparison. Thank you Tim, and 73 zzz!

@timg5tm941

Жыл бұрын

Thank you! 73

The secret sauce of making a loaded antenna as efficient as possible.

@timg5tm941

Жыл бұрын

Absolutely

Tim - I dont operate Mobile like I did 10-20 years ago, but I had great success via a capacitive Match at the base of my 8 foot cut for band "Hamsticks", I believe I used simple 1kv 470pf disc caps for 75 meters, and 240 pf at 40 meters, you could select the right capacitor for the best SWR. If you operated "off resonance" in a particular band, that capacitor sure would get hot! But it worked well, and more importantly survived the weather well, snow, ice, rain etc. I did try the coil matching technique as well, but it did not survive the winter elements at all. Worked a ton of DX via this technique. 15 meters was a blast, but I could also maintain regular contacts on 75 and 40 meters, by simply swapping 8 foot Ham Sticks around. Ahhh, the good old days.... 73s I like your YT Channel de Jerry KC2UT

@timg5tm941

11 ай бұрын

Great examples Jerry - thanks!

First class as always mate. What I find amazing is the contacts you can make such an "inefficient" antenna. Just goes to show that what matters most is just getting some RF into the air.

@timg5tm941

Жыл бұрын

Rule number 1 .. get on the air mate! 73

@TankdozerCavalry

Жыл бұрын

@@timg5tm941 Any antenna is better than no antenna!

@timg5tm941

Жыл бұрын

@@TankdozerCavalry absolutely!

I watched you in your car doing the contest. VERY interesting.. I talked about you at our weekly club meeting here in Brussels Belgium (BXL) I was wondering about your antenna. This video is what I am looking for Thanks

@timg5tm941

Жыл бұрын

Thank you Peter! 73

Brilliant video, very informative

@timg5tm941

Жыл бұрын

Thank you Bill!

Great video thanks Tim

@timg5tm941

Жыл бұрын

Thanks!

Enfin une bonne analyse !

@timg5tm941

Жыл бұрын

Merci beaucoup!

Interesting video again mate

@timg5tm941

Жыл бұрын

Thanks Nick!

Thanks for another good one.

@timg5tm941

Жыл бұрын

Cheers Mike!

Hello Tim. Great job sharing so mutch important knowledge Buy the way, my mobile antennas are Diamond HF-CL / 73 CR7BDO

@timg5tm941

Жыл бұрын

Thanks Jose - I am looking at those in a future video.

@joseneves2822

Жыл бұрын

@@timg5tm941 Nice 👍

Your are my lawyer against Antenna Manufactures

@timg5tm941

Жыл бұрын

Ok!

very nice

@timg5tm941

Жыл бұрын

Thanks!

Hi Tim, is there a way to measure the insertion loss of a loading coil or a way to measure its efficiency at specific frequencies? If so, how would you go about this? Knowing this information would be extremely helpful for people running qrp.

@timg5tm941

4 ай бұрын

That is something I need to investigate

@kylefreemason

4 ай бұрын

Hi Tim, I sent you an email.

Then a centre loaded over/ near sea water for compact size or just a plain vertical (DX Commander type) near same?

@timg5tm941

3 ай бұрын

Full size 1/4 wave has a slight advantage. Also depends how short the loaded vertical is

There are many more variables to this you even get capacitance between the windings, Plus many more things like the pitch of the windings, I'm not going to give away info that went into the two years R & D of the Slidewinder dx coil, But basically it wasn't just some wire wound on a former.

@Tantalicdavid

Жыл бұрын

@@timg5tm941 Good video Tim, Most of the foundation theory of loading coils was covered so you have done quite alot of research, It was good that you showed center & top loading isn't as good as some may think.

@timg5tm941

Жыл бұрын

@@Tantalicdavid I agree about centre loading. So many think the enhanced current pattern is the be all and end all but forget about the extra coil resistance. My next video about this directly compares examples of well known mobile centre and base loaded antennas.

@Tantalicdavid

Жыл бұрын

@@timg5tm941 Looking forward to watching it Tim.

@chrissuddell7940

Жыл бұрын

@@timg5tm941 if you want to see a silly stupid large coil drop me a PM and I'll load you mine, I built it for 80m. M0VUE

What about top loading. it does exist....or 3/4 loading?

@timg5tm941

Жыл бұрын

Spoke about both in the video.

@G7VFY

Жыл бұрын

@@timg5tm941 I have seen big mobile whips with some curious coils. I have all the Hustler ones (Except maybe 17m) but the one I saw was far bigger, and in red fibreglass. looked like an oversized CB antenna,

First. Never done that before. 🙂 Now I'll go and watch the video having been told it was released 24 seconds ago...

@timg5tm941

Жыл бұрын

Ha! Nice one Paul

We could do all of this, and still not be heard. Simply add a gigawatt amp and your all set, as long as you keep the output power below 1.21, NO flux capacitor is required.....

@timg5tm941

Жыл бұрын

Ah right