By a strike of luck the SurvivalComms name is used by me and another guy (Bret) for his Youtube channel.
It also happens that we both are focused on practical HAM radio matters for Survival and Prepping.
Bret is not only knowledgeable but also good at breaking down matters and applications into simple, layman’s terms. Among these are his DIY simple antennas.
So DO subscribe to his channel.
Building a Communications Network.
When building a communications network, one must answer 3 basic questions which form one of those dreaded decision triangles.
What is the purpose and object (what signals must be exchanged, text or e-mail maybe?)
Continue reading “Radio Communications Musings no2.”
What is Communications?
The word has obviously has to do with “Community” in the sense of Sharing. Sharing of information that is. But what kind of information?
To put it straightforward, it is about information that will allow proper decision making on all levels of involved parties, and for the task at hand.
Imagine you are in a rescue team searching for an injured hiker. What kind of information would you beam back to base once you find him?The victim status is an obvious one. Time of arrival is another, needed resources and assistance on route is another, etc.
But does the base needs to know that you have arrived at a tight spot and you will have to rig a way to pass the stretcher along a crevice? So in the process you need to judge what to pass on and what to leave out. Cos too much of data may needlessly burden and clog the command center, delaying decisions.
Continue reading “Radio Communications Musings no1.”
Ο παρακάτω πίνακας συντάχθηκε κατά την προετοιμασία της παρουσίασης για το επόμενο Σεμινάριο Ραδιοεπικοινωνιών.
Δεν είναι λίγες οι φορές που ένας νέος ραδιοερασιτέχνης ή χειριστής επιλέγει ένα κοινό ομοαξονικών καλώδιο μεταφοράς για την κεραία του, το RG-58. Αυτό βρίσκεται εύκολα, είναι σχετικά οικονομικό, εύχρηστο αλλά παρουσιάζει μεγάλες απώλειες ισχύος, ειδικά στις μεγάλες συχνότητες.
Continue reading “Μια ματιά στις Απώλειες των Ομοαξονικών Καλωδίων των Κεραιών μας”
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.
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”
The man behind the GuerillaComm Youtube Channel does wildfirefighting comms. In his new videos he loads up the deployment comms and personal gear and sets up a filed repeater. Do not miss this!
You have your first radio for some time now, you want to increase its performance in the field and also make a better radio kit for it. If you haven’t heard or read yet, the three most important words in radio communications are: Antenna, Antenna, Antenna
(which are followed by the next three: Location, Location, Location)
So, let’s see what your starter antenna options are . And that means simple, economic, easy to deploy -or even make- radio antennas for the VHF and UHF bands.
It is the antenna that uses an artificial “ground” to work. In a base antenna the “ground” is the 3 or 4 radials that extend from its base. In a mobile (car) antenna the “ground” is defined by the car’s metallic body.
So a way for a ready-made option is to take a mobile antenna (that is already pre-tuned) and create its ground yourself.
One option is to get a magnetic base antenna and nail a metal sheet on top of a pole. This can be a lid of a paint can, a cookie baking tray etc etc. Then you stick the magnetic mount antenna on top.
Continue reading “Basic Antennas for VHF-UHF Field Communications part 1”
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:
- 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.
- 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
If there was a plan for little green Martians to conquer the earth, they would hide inside the Baofeng (UV-5R) radios and then pop out the same exact moment all around the world.
And those being so popular and cheap are two of the reasons for trashing them around the web. But are they…
Glorified FRS radios or Incentives for new HAMs?
Among the preparedness and survivalist communities the BAOs are prevalent. And I do not think there is anyone that has a second radio and it is not a UV-5R. so even the advanced HAMs among us could not resist the temptation of the cheap and “easy” radio.
Continue reading “Random Thoughts on the BAO(feng)s”
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.
– 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:
Continue reading “The AA Batteries and Your Radio”