Tag: DIY

More Easy Antennas for the VHF/UHF

For the purposes of the next Radio Communications Seminar I constructed 2 antennas.

The first one is a ground plane field antenna using a folding handheld radio antenna.

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An SMA to chassis mount adapter is used and the radials are just solid core wire twisted through the adapter mount holes. The good thing about this method is that the antenna requires no tuning as the vertical element is already pretuned.

Continue reading “More Easy Antennas for the VHF/UHF”

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One more DIY Groundplane Field Antenna version

Bret at the SurvivalComms Youtube channel (it is not me, just a name coincidence I did not expect) has built his own version of the Jungle Antenna (Link 1, Link 2)

He uses a ring made from ABS rods to “hang” and position the ground wires, and the handheld’s radio own antenna. From the looks of it performance can further be increased with a telescopic antenna like the Diamond RH-770.

He also has a build of a discone antenna with the same method.

DIY folding VHF / UHF Discone Antenna

Check him out!

 

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Easy DIY VHF Antennas with the BNC Male to Banana Jack Connector

In this short piece I will exploring the uses of the BNC Male to Banana Jack Connector in VHF antenna building.

It is a very controversial item cos it allows easy connection of the antenna elements, has a build-in coax connector, is stout enough for field work, and has also 2 mounting holes to pass your wire or paracord through. Practically you can build anything with it as long as you can cut and strip some wire.

Unfortunately I am too  occupied with lesser stuff to make and tune the actual antennas, so please make do with their simulations and a few comments.

The Vertical Dipole

Dipole

Continue reading “Easy DIY VHF Antennas with the BNC Male to Banana Jack Connector”

Χρησιμοποιώντας δυο Aσύρματους σαν Repeater

Η ιδέα δεν είναι καινούργια, και μπορεί να το κάνει ο καθένας διασυνδέοντας δύο ασυρμάτους μεταξύ τους ώστε να λειτουργούν σαν Repeater (Επαναλήπτης) για να καλύψει σημεία που δεν έχουν επαφή μεταξύ τους.

Η σύνδεση γίνεται με καλώδιο μεταξύ της εξόδου του μεγαφώνου του πρώτου ασύρματου  (που ακούει), και του δεύτερου που αναμεταδίδει στην υποδοχή του μικροφώνου του.

Στο YouTube υπάρχουν δύο σχετικά βίντεο αλλά κάτι δεν πάει καλά με την συνδεσμολογία τους.

Continue reading “Χρησιμοποιώντας δυο Aσύρματους σαν Repeater”

Setting up 2 Radios as a Repeater

There is a good chance that you have already watched at least one of the following Youtube  videos.

Both show how to make a repeater by linking two radios (usually Baofengs). But I am having my reservations about the wiring they use.

This one has it DEFINETELY wrong.Set up a Baofeng UV-5R Repeater System

Similarly,  Miklor’s site shows the same method in detail.

The reason is explained in the second video, but still I cannot get what he is doing with the wiring.

HAM repeater (field expedient) using UV-5R Radios

So let’s take it from the start.
Below is the Kenwood type interface, applicable to most Chinese radios our there (Baofeng and Wouxons for sure).

Continue reading “Setting up 2 Radios as a Repeater”

Prototype Build: Backpackable Foldable Yagi antenna

This is only the proof-of-concept prototype.

I have been cooking a design for a backpackable 4-element Yagi antenna for some time now.

The basic idea is to make a telescopic boom out of two PVC pipes and have removable elements that store inside it.

It took me some time to figure the method of attaching the aluminum welding rod elements (used Kosh electrical connectors) and how to integrate the feed point inside the boom. This will be the next build step.web-0593-640

Feedpoint detail

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My Tupperware Baofeng Radio Kit

First I am cheap. Then I am unemployed. And lastly it is foolish to travel to the next big city to find a padded pelican case and pay for it as much as the kit costs, AND as much for gas money. So an old Tupperware brand food container was used. See, I do try for quality when I can!

So I started with placing a carton sheet on the bottom of the box, and continued by laying the items, and marking the dividers position. Then I removed the carton, made the dividers and glued them on. Then I proceeded with gluing thin packing foam sheet.

With a bit thicker packing foam I covered the bottom of the compartments and I also cut a covering sheet by the same material.

And I ended up with the following. Not pretty, but functional, and easy enough for your kid to do.

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New Batterypack and Custom UV-5R Battery Eliminator

This is a continuation of two other projects the External Battery Pack for our handheld radios and an improvement on the Battery Eliminator we did for the Bao.

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The Battery-Pack / Powerbank

This is a smaller size using two 18650 Lithium-ion rechargables to get the same voltage as the original Baofeng battery.

We have an affinity for the 18650 batteries, mainly because they are easy to handle, they lead the battery technology at the moment, can be cross loaded to other devices such as USB powerbanks, and we have a plenty of, since we are into flashlights too.

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Αναδρομή σε Παλιότερα Άρθρα μας.

Το SurvivalComms γεννήθηκε εξελικτικά μέσα από το GreekPreparedness Blog. Κατά την πορεία του συμπεριλήφθηκαν αρκετά άρθρα σχετικά με τις επικοινωνίες.

Μπορείτε να τα δείτε ακολουθώντας τα παρακάτω link.

 

Το Σεμινάριο Βασικών Γνώσεων Ασυρμάτου του Greekpreparedness Blog

 

Γενικά

10 Σημαντικές Δεξιότητες Επικοινωνιών σε Περιπτώσεις Αναγκών (αναδημοσίευση/μετάφραση)

Ένας προβληματισμός για την Αξία των Κινητών Τηλεφώνων σαν μέσο επικοινωνίας ανάγκης.

Continue reading “Αναδρομή σε Παλιότερα Άρθρα μας.”