Category: Power

HAMsmithing July 2017

This is a DIY USB charging cable for my Kenwood TH-F6A/F7E handheld radio.

web-IGP3869It is the same concept like the Baofeng USB to 10V charging cables that are found on eBay and amazon. But the virtue of the Kenwood HT is that it accepts a wide array of operating and charging voltage. Plugged to a 12V source it both charges and operates.

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Charging your Kenwood or Yaesu radio with USB power

If you are an owner of Kenwwod or Yaesu handheld radio, or anyone that accepts a charging input of 12V, then you might try this:

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The item regarding, is a USB to 10V adapter made for the Baofeng cradle charger. Its power plug is a 5.5×2.1 one. Then one can add an adapter cable for the plug his radio uses (the Kenwood one is 3.5×1.35mm). And have a way to charge from any USB port.

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The Ultrapack Battery Pack for QRP Low Power Radios

Survival Tech Nord has an open project running for making a small external battery bank for radios that operate at low output (5+ watt).

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The basic principle is using 18650 lithium-ion (Li-Co or Li-Mn) batteries that have big energy density and match their voltage to that of the radio.

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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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Notable Notes 3: A Look at AC Inverters for Off-Grid Power

Starting with a Note… I started this Notes series as a way to redirect readers to worthwhile articles and info sources. Sort of what you do when you share a post in Facebook. I strive for original content, so this method allows me to avoid informing readers of the good stuff out there without having to synthesize a new article of my own.

 

On the subject matter now, recently I stumbled on 2 articles on Inverters and the way to apply them for off-grid (read that as emergency also) power. They are on the Off-Grid HAM blog. Check them out!

AC Inverters For Off Grid Power, Part 1

AC Inverters For Off Grid Power, Part 2

Οι Μπαταρίες ΑΑ και ο Ασύρματος σας

Κατά κανόνα υπάρχουν μπαταριοθήκες ΑΑ & ΑΑΑ που αντικαθιστούν την κανονική μπαταρία για τους περισσότερους ασύρματους χειρός. Οπότε είναι καλό να έχουμε μια σαν εφεδρική πηγή ενέργειας, αλλά θα πρέπει να την δοκιμάσουμε εν λειτουργία πρώτα.

Και αυτό γιατί:

  1. Το βολτάζ των επαναφορτιζόμενων και των αλκαλικών μπαταριών ΑΑ είναι διαφορετικό και μπορεί ο ασύρματος μας να μη δουλεύει με έναν από τους δύο αυτούς τύπους.
  2. Συνήθως οι ασύρματοι χειρός κατεβάζουν ισχύ όταν χρησιμοποιούν τέτοιες μπαταρίες γιατί αυτές δεν έχουν την δύναμη να αντέξουν το φορτίο σε πλήρη ισχύ.

Διαβάστε περισσότερα στο blog μας GreekPreparedness

 

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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The AA Batteries and Your Radio

Luckily most handheld radios and some QRP Rigs (Low Power shortwave radios) have an alternate AA battery option. It is prudent to include a AA case for any radio you own, but DO TEST it first.

Do not make the assumption that all will work fine, there are two hidden bugs particular to any radio.

These are:

– Voltage incompatibility depending on the type of batteries you use.

– The radio dropping its power on AA batteries.

 

So in the past few days we have been testing our Baofeng with various kind of AAA batteries options. Also Kenwood has details enough on final power out in the manual of the TH-F6 handheld that we also own. To summarize both:

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A look at some Older Articles of ours

The SurvivalComs blog sprouted from our other blog, the GreekPreparedness Blog.

In there one can also find articles on survival communications.

Yu can have a look at them by following the relevant links.

 

A Spare-Emergency Cell Phone Kit

 

Battery Banks for Handheld Radios

DIY Handheld Radio External Battery Pack

My HT Radio Powerbank, Generation 2

Continue reading “A look at some Older Articles of ours”