Monday, September 19, 2022

The GRHub Network is still operational even if there is a Power or Internet Outage!!


With Stage 6 Load-shedding (blackout) in full swing in South Africa I have been asked whether the GRHub Network is still operational during load-shedding and even when there is no Internet Services.  The quick answer is YES.  It works despite load-shedding or Internet outages.  Unlike Echolink that will not work if there is no Internet, the GRHub Network that runs AllStar is operational during loadshedding and Internet Outages. 

The only draw back is that you will not be able to connect to stations elsewhere in the country or world.  Locally you will be able to use the 145.550 Mhz link to get access to the network.  I am currently busy to look into methods to add HF Radio to the GRHub Network whereby I hope you will be able to access the network via HF.  It is imperative that we look at ways and means to still use the GRHub Network despite all odds.  I will soon test several alternative options.  I am looking at HF, AREDN, Winlink etc.  

Another problem we currently experience is that the broadcasting of bulletins sometimes gets interrupted when the Internet Fails.  The plan is to run pre-recorded bulletins from HF/VHF/UHF to the GRHub Network when there is loadshedding.  Currently we run bulletins from the Internet (Echolink) to the GRHub Network.  It has now happened several times that bulletin playbacks stop halfway through the broadcast and you then need to re-run it in Echolink.  If the Internet is down you cannot broadcast a bulletin from Echolink to the GRHub Network.  The change will result in a bulletin that will be broadcast via radio instead of the Internet.  I will start conducting tests this morning in this regard.  Locally radio amateurs should have no difficulty to listen to bulletins being broadcasted on the GRHub Network.  It is hoped that our Internet listeners will also be able to listen uninterrupted to any of the bulletins being broadcasted by the GRHub Network in future.

I hear many shout:  " That the Internet....you cannot rely on the Internet!!"  The GRHub's Internet rarely goes down.  The problem comes with loadshedding where areas of the country experience outages at different times and where loadshedding "hogs" the Internet.  Slow Internet speeds due to loadshedding also cause problems.   The GRHub Network uses an LTE  Internet connection which is 99.9% reliable in my area.  

I would like however to encourage radio amateur to switch from Echolink to AllStar.  The benefits of AllStar speaks for itself.  It works even if there is no Internet.

Finally:  The GRHub Network has experience two incidents where Internet Outages occurred this past week.  This is really no "car smash" taken into account how long and at what frequency loadshedding occurs.  Furthermore loadshedding and Internet outages is currently no problem to the GRHub Network.   However I do not know what the future hold for power in this country.  It does not look good and we must urgently look at alternatives. Thus far I have been able to come up with alternatives to curb power and Internet outages.  I find it very satisfying when I can come up with alternative solutions iro VOIP or Amateur Radio.  Updates to follow in this regard.

Sunday, September 11, 2022

DIY External 18650 Li-ion Battery Pack for the Yaesu FT817 (Version 1)


In this posting I will describe how I built a cheap DIY 18650 Lithium-Ion battery pack for my Yaesu FT-817. I decided to go the cheap route by salvaging 3 x Laptop battery packs that was in my junk box. I tested each cell and discarded dead or bad cells. These cells were all Li-Ion batteries. The cell voltage of the batteries I used was in the 4.18v range.. So that gave me 12,6V on a 3S pack which is in the specs of most standard amateur radio transceivers. 

I used a simple tester to test each individual battery. However this is not the way to do it but I had it on hand and thus far it has worked for me. (More information on the tester can be found later in this posting) I charged each cell separately using a one cell charger as shown in the photo. Once all three batteries were charged to within specs I used a 18650 holder instead of solder directly to the batteries which is not a good idea. There after I soldered the wires to the connectors and wires as shown in the images and schematic diagram. I did not use a Battery Management System (BMS) as I own a balancing charger. I only added a power lead for charging and a balancing lead.

The charger is depicted in the photos below. I decided to build this battery pack as simple as possible with very little bells and whistles. Thus far it works flawlessly with the FT817. This pack can also be used for a variety of other power sources. You can either add a power up converter or a down converter for the voltage that you need.

I decided to build a lightweight, low cost and KISS power pack for the FT817 but also to be used in other projects. I still have several 18650 batteries in the junk box and will construct a larger capacity battery bank for the FT817 in future. 

The total cost of the project did not exceed +- R60.00 having used salvaged batteries, junk wire and balancer lead from the junk box. The items that made up the total cost was the heatshrink, XT60 connector and the 18650 case.

Finally:  When using the battery pack with the Yaesu FT817 I will add the  Lithium Battery Low Voltage Alarm Indicator to the balancing lead to monitor the full (All)  battery voltage and also individual No 1-3 cell voltages.  Update to follow in a future post once the pack is tested  fully.

(Click on images for larger view)








Above:  Single cell 18650 USB Li-ion Battery Charger

Above:  Battery Tester 2S-6S RC Lipo Li-ion Lithium Battery Low Voltage Alarm Indicator Meter Checker Tester Red LED Digital Display 2-6S Voltage Tester.

Specification:

Used for 2S-6S(7.4V~22.2V)Li-Po /Li-ion/LiMn/Li-Fe Battery

Voltage detection precision:±0.01V

Unit voltage display range: 0.5V-4.5V

Total voltage display range:0.5-27V

Pins distance: 2.54mm

0.36 inches digital display

Voltage Display unit is \”v\”

Display \”NO.1/2/3/4/5/6\” is the number of battery cell

Display \”ALL\” this is total battery voltage.

The use of programmable memory for calibration of the voltage measurement accuracy

Test the working state of lithium battery.

Compatible for 2-6S Lipo/ Li-ion/ LiMn/ Li-Fe battery

Color: red

Size:4.8×1.8×0.8cm

Net weight:7g




 

Monday, September 5, 2022

#9 What is in the Envelope/Box?


Here is another "What is in the Envelope/Box?"  As stated before we do not have a local emporium that sells electronic components.  I have to order components from the big cities.  Be as it may, receiving a parcel with goodies is always exiting.  The components will be used in various upcoming amateur radio projects.  Stay tuned!

Components:

 2 x Syba USB Sound Adapters (CMedia CM119)

24 x XT60H (XT60 Upgrade) Male Female Bullet Connectors Power Plugs with Sheath

I looked all over South Africa for this specific USB Sound Adapter but could not find this specific product.  I then decided to import the product.  Although this is not the best audio USB Sound Adapter out there it is more than adequate for amateur radio use.  

The 24 x XT60H connectors were available at an astronomical price and of lesser quality.  I found this product listed on Amazon.Com and decided to order hopefully enough for my future use.  More on the projects in future postings.

Here is more information about the products:


Syba external USB Stereo Sound Adapter for Windows, Mac, Linux Extra Audio Source with 3.5mm Audio Mic Jack C-Media Chipset 

Product details:

Brand Syba

Hardware Interface USB 2.0

Audio Output Mode 2.0

Platform Linux

Hardware Platform Headphones, PC, Laptops

Maximum Sample Rate 48 KHz

  • Compliant with USB 2.0 Full Speed (12Mbps) Specification
  • Compliant with USB Audio Device Class Specification 1.0, Compliant with USB HID Class Specification 1.1
  • USB Bus-powered Mode, No External Power Required, Near full 5V power ouput to Microphone
  • Connectors: USB Type-A, Stereo output jack, Mono microphone-input jack
  • LED indicators: Microphone-Mute Status, Activity FG-UAUDV1-C119


 

24 Pair XT60H (XT60 Upgrade) Male Female Bullet Connectors Power Plugs with Sheath

Product details:

Brand FymuSing

Battery Cell Composition Lithium Polymer

Recommended Uses For Product Drone

Unit Count 12 Count

Item Weight 3 Kilograms ??

  • 12 Pair high quality female and male XT60H Connectors
  • For RC Lipo Batteries Drones Airplanes Cars Vehicles
  • 60 Amp Current Handling Bullet Connectors, Suit for 90-120A current application
  • High Temperature Nylon Material, Half open end, easier for welding and no heat shrink required
  • Protected to avoid shorting and reverse polarity

 

 
 

 

 

Photos:






 

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