During the weekly F-troop there are mentions of software, websites and solutions that are worth taking note of. This website attempts to document them.

20180512 - Programming the Ailunce HD-1

posted May 11, 2018, 6:44 PM by Onno Benschop   [ updated May 11, 2018, 6:46 PM ]

Carsten VK6PCB has shared with us a guide to programming the Ailunce HD-1 DMR radio.

20180421 - Air Variable Capacitor

posted May 3, 2018, 11:51 PM by Onno Benschop

Roger VK6FRAN has been building rotors and stators as one stack to construct an air variable capacitor. Denis VK6AKR said:

Roger milled all rotors and stators as one stack over about 55 minutes.   The time could be reduced, we believe, by being more aggressive with our feed parameters and choice of lubricant but such is the nature of experimentation!

His next intention is to add a fine tuning capability.   Now to locate a nice loop design that can tune with around 20 to 25 pF.

20180428 - Where to Get Fasteners?

posted Apr 27, 2018, 5:32 PM by Onno Benschop

Places to get bolts and weird threads:
  • Searle fastners - Willeton
  • Hosemasters
  • Konnect - Osborne Park
  • Super Cheap Auto
  • Car scrap yards

20180407 - SMS QSO confirmation

posted Apr 6, 2018, 6:02 PM by Onno Benschop

W5WTH Pat shares with us a project he's just completed:

20180212 - Emission Modes

posted Feb 11, 2018, 2:51 PM by Onno Benschop

Andrew VK6AS shares a tool that allows you to lookup the emission modes that the ACMA uses to designate different types of transmissions:

20180127 - HF exploration

posted Jan 27, 2018, 12:12 AM by News Team

John  VK6JD shares an online series of tools that can be used to determine propagation levels around the globe:

20180127 - HF Signals to check propagation

posted Jan 27, 2018, 12:10 AM by News Team   [ updated Jan 27, 2018, 12:11 AM ]

John VK6JD reports from Kalgoorlie that one of his preferred tools for propagation is listening to the Wiluna HF Weather Fax service broadcast on many different frequencies:

20180120 - Flowerpot Antenna for 2m and 70cm

posted Jan 19, 2018, 4:53 PM by Onno Benschop   [ updated Jan 19, 2018, 5:04 PM ]

Lots of discussion about a simple to construct antenna. A good example is:
Bert VK6HDY built one and shares it with us:

#antenna #build

20180114 - Soldering Tips

posted Jan 15, 2018, 5:47 PM by Onno Benschop   [ updated Jan 15, 2018, 5:48 PM ]

Denis VK6AKR sends in this information about soldering:

Hello Onno

One thing that time did not permit mentioning this morning relates to power connections.   Mainly DC power connections.   For these, especially those carrying significant current crimping or compression screwing wins every time over soldering.   The reason as you'll doubtless already know is that a soldered joint *may* offer some resistance which will give rise to heating in the presence of significant current flow.

Crimp connectors, correctly sized for the cable and correctly crimped offer gas-tight joints with high quality (low resistance) contact into the connector pin, finger, whatever.   A good alternative is a screw type connector such as an electrical "blue point" connector.   But in this case the individual strands of wire must not be tinned (soldered) together no matter how tempting that may be.   The reasoning is that solder tends to "flow" over time under pressure and this again gives rise to resistance and heating.   With attendant fire risk.   Not a good look.

So important is this latter point (not tinning wire bundles) that back in my apprenticeship days (radio and TV - valve radio, valve black and white TV) we had to obtain our "cords and plugs" electrical workers' licenses.   This enabled us to carry out necessary repairs to electrical appliances of the plug-able variety.   No fixed-wired stoves, hot water system, etc.   Part of the license was a test where we were presented with various flexible cords, plug tops, terminal blocks and so on, screwdrivers and other hand tools, and a soldering iron, flux and solder all in good working condition.   It was an instant fail for anyone tinning wire bundles to be held under screw tension in plugtops, etc for the above reasons.

Above I said that soldered connections *may* offer resistance.  Ideally a soldered joint will use the solder purely as a mechanical bond.   Electrical conductivity a distant second.   So joining wires involves making the tightest possible mechanical bond between the wires prior to applying solder, which will then maintain the bonding.

Not sure if this is selling coals to Newcastle but there you go.

Denis VK6AKR of crappy signal fame!

#vk6akr #soldering #tips

20171230 - Skywire Antenna

posted Dec 29, 2017, 4:55 PM by Onno Benschop

Denis VK6AKR sends us some details about radiation patterns related to skywire antennas:

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