Search found 186 matches

by Andrew (grayhat)
Wed Mar 19, 2025 9:25 pm
Forum: Questions & Advice
Topic: don't underestimate the humble dipole
Replies: 4
Views: 12397

Re: don't underestimate the humble dipole

and then here are some considerations regarding vertical antennas

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

HTH
by Andrew (grayhat)
Tue Mar 18, 2025 5:32 pm
Forum: General Discussion
Topic: The perfect POTA/SOTA rig
Replies: 8
Views: 48211

Re: The perfect POTA/SOTA rig

ok, perfection isn't of this world, but let's just try to play with some imagination, start with an existing or a non existing rig, and add all the features you feel important for a POTA/SOTA activator or for a hunter, come on, let's raise some holidays dust :) P.S. keep real, don't ask for dilythi...
by Andrew (grayhat)
Tue Mar 18, 2025 8:51 am
Forum: Questions & Advice
Topic: 49:1 antenna question
Replies: 5
Views: 16413

Re: 49:1 antenna question

if space is constrained and you are ok with using an ATU, you may consider this linear loaded doublet

https://www.m0pzt.com/80m-cobra-doublet/

which allows to cover all bands from 80m up
by Andrew (grayhat)
Tue Mar 18, 2025 8:45 am
Forum: Questions & Advice
Topic: 49:1 antenna question
Replies: 5
Views: 16413

Re: 49:1 antenna question

Good morning, Got a question regarding my 49:1 and wire length. Is there a wire length that is shorter than the 67' roughly that I'm currently using for multi band ? Im looking to get a short no tune 40m wire made up. The current 67ish feet im currently using is great but just looking to go short t...
by Andrew (grayhat)
Mon Mar 17, 2025 12:58 pm
Forum: Questions & Advice
Topic: don't underestimate the humble dipole
Replies: 4
Views: 12397

Re: don't underestimate the humble dipole

Voacap is fantastic. I shared the tool with my club a couple months back, was well received. Nice write up on Dipole as well. Thanks for sharing! I agree regarding VOACaP but my post was mainly about the best height for a dipole and it starts at a minimum of 0.6 wave height, a dipole at such height...
by Andrew (grayhat)
Mon Mar 17, 2025 11:16 am
Forum: Questions & Advice
Topic: 49:1 antenna question
Replies: 5
Views: 16413

Re: 49:1 antenna question

https://www.aa5tb.com/efha.html

worth a careful read imVHo
by Andrew (grayhat)
Mon Mar 17, 2025 11:13 am
Forum: General Discussion
Topic: Simple beam antenna - the G4ZU "Jungle Job"
Replies: 1
Views: 20437

Re: Simple beam antenna - the G4ZU "Jungle Job"

if someone here isn't familiar with ERP/EIRP and antenna gain, my suggestion is to try this

https://m0ukd.com/calculators/erp-eirp-calculator/

just enter the output power of your TX and the antenna gain and check the EIRP value, then change the antenna gain and look at its effect
by Andrew (grayhat)
Sat Feb 15, 2025 12:27 pm
Forum: Questions & Advice
Topic: EFHW UNUN test
Replies: 2
Views: 21361

Re: EFHW UNUN test

by Andrew (grayhat)
Fri Feb 14, 2025 7:58 pm
Forum: General Discussion
Topic: Kite lifted antennas
Replies: 6
Views: 63189

Re: Kite lifted antennas

https://www.aa5tb.com/efha.html

I think one of those, cut for the 80 or 160 meters band may fit pretty well the kite setup