Month: May 2016

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.

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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).

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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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Notable Notes 3: Get Ready for the DMR radios

It is happening for just a while but it is happening Fast!

The new digital radio technology has come to market and it is reasonably cheap and accessible.

There are many applications one can use for the benefits the survival community, like AES encryption for $100, and Digital/Analog interoperability.

But that is the tip of the iceberg, there are many interesting options, so take the time to watch at least the first video.

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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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