Search found 118 matches

by Andrew (grayhat)
Wed Dec 06, 2023 4:52 pm
Forum: Questions & Advice
Topic: Portable 10M Yagi ?
Replies: 10
Views: 6669

Re: Portable 10M Yagi ?

Andrew, How would you go about constructing the jungle job? For 28MHz, you'd need about a 16 foot reflector. Do you make it out of aluminum pipe or PVC with wire inside (or outside)? To me, it sounds a lot more difficult than a Moxon with a 3D printed hub - maybe because I've already printed the hu...
by Andrew (grayhat)
Mon Dec 04, 2023 8:07 pm
Forum: Questions & Advice
Topic: Portable 10M Yagi ?
Replies: 10
Views: 6669

Re: Portable 10M Yagi ?

A moxon may be a nice antenna, but... please see my observations; and then, a "Jungle Job" is really easier to build and deploy in almost half the time needed to deploy a moxon and is much simpler than the mox if you think at it for a second, plus ... well want we talk about performance of...
by Andrew (grayhat)
Mon Dec 04, 2023 3:42 pm
Forum: Questions & Advice
Topic: Portable 10M Yagi ?
Replies: 10
Views: 6669

Re: Portable 10M Yagi ?

Bob, I understand your wish to try maximizing the little power you use, but... If it was a matter of chasing DX or to contact some "rare" call, then I'd absolutely go for a "Jungle Job", since it's easy to put together so that it will be easily portable/deployable and since it wi...
by Andrew (grayhat)
Fri Dec 01, 2023 1:24 pm
Forum: Questions & Advice
Topic: Portable 10M Yagi ?
Replies: 10
Views: 6669

Re: Portable 10M Yagi ?

couple notes, first of all, it will be easy to optimize the "jungle job" for CW, just calculate it for the middle of the CW slice and then prune the dipole to bring it to resonance Then... a contest like the one you named is somewhat "a different kind of beast" and in that case y...
by Andrew (grayhat)
Fri Dec 01, 2023 9:12 am
Forum: Questions & Advice
Topic: Portable 10M Yagi ?
Replies: 10
Views: 6669

Re: Portable 10M Yagi ?

Why not a G4ZU (SK) "Jungle Job" antenna ? https://www.essexham.co.uk/images/g4zu-junglejob-01.jpg it's a 2 elements yagi with a decent gain and the size is still manageable, plus it just needs a simple 1:1 balun at the feedpoint; a note, the formulas given are for metric units with a bit ...
by Andrew (grayhat)
Fri Nov 24, 2023 4:52 pm
Forum: Questions & Advice
Topic: RG316
Replies: 2
Views: 2124

Re: RG316

How long can i go with RG316 before the losses are too much. i usually carry 35’ of RG58 just thinking something smaller and more manageable for a push up mast. regarding the RG58, check the loss here https://messi.it/en/comparison-chart-50-ohm-cables.htm and then, regarding cable, check out the li...
by Andrew (grayhat)
Wed Nov 15, 2023 3:21 pm
Forum: General Discussion
Topic: Vertical antennas, an interesting discussion
Replies: 2
Views: 2267

Re: Vertical antennas, an interesting discussion

A tribander on a 100 foot tower will outperform just about anything, but it's really hard to fit one in my backpack. I think the same thing applies here - a 1/4 vertical is probably easier to carry and set up than a 5/8 vertical, so even if it may technically have better performance it loses in the...
by Andrew (grayhat)
Sat Oct 21, 2023 8:26 am
Forum: General Discussion
Topic: Vertical antennas, an interesting discussion
Replies: 2
Views: 2267

Vertical antennas, an interesting discussion

The infos are here

https://practicalantennas.com/designs/v ... s/5eights/

in short, a "poor" quarter wave vertical can outperform a 5/8 if installed at the "right" height, the trick is to adjust the top height :D
by Andrew (grayhat)
Fri Oct 20, 2023 2:29 pm
Forum: General Discussion
Topic: Travel to Europe with KX3 questions
Replies: 13
Views: 6304

Re: Travel to Europe with KX3 questions

Slowy working on a "Field Trip to Greece" report for Thomas. Half our group got COVID, including my YL, so things have been moving pretty slow. I got some weird Asia Minor virus that's persistent. Anyway, trip was totally worth it. Hope it isn't the so called "long COVID", at an...
by Andrew (grayhat)
Tue Oct 10, 2023 5:12 pm
Forum: General Discussion
Topic: Travel to Europe with KX3 questions
Replies: 13
Views: 6304

Re: Travel to Europe with KX3 questions

So you finally got back home :D !

Now... once the dust sets, may we hope to see some report with pics and notes :) ?