Wednesday, September 30, 2026

Cleaned the work bench - why is it so damn hard?

My electronics work bench seems to descend in to entropy of its own accord faster than I can deal with it. Part of the problem is my short attention span - I start new projects before finishing the current ones.

I've had "clean shack bench" on my daily Reminder list, haunting me for months. Finally, over two days, I've taken drastic action.

Part of the problem is all those components, plugs, sockets, adapters, and bits of wire fall between not useful enough to have a proper box to go in and not useless enough to go in the bin.

My radio shack is quite small - probably a good thing - like a gas, junk expands to fill the available volume.

Cleaning up also triggers the mind and it's hard not to see something and start tinkering with it again.

Anyhow, I'm pleased that it looks good enough to work on again.



Tuesday, September 29, 2026

Built another NE602/LM386 Direct Conversion Receiver

In recent months I've been off in the land of software development and have been sadly ignoring the electronics workbench. To get me back in the mood I built another instance of the simple direct conversion receiver using two ICs described in Experimental Methods in RF Design.


NE602 mixer chips are a bit hard to find and the only ones I have are surface mount so you can see it on a little carrier board above. This design uses the on-chip oscillator. My tuning is extremely sensitive and will need some padding to give me band spread of just the 40m band. At this point I haven't tuned the front end and it's undoubtably way off so the receiver is quite deaf.


In the past I've built the, all discrete component, Soldersmoke Direct Conversion Receiver. That project is much more challenging than this little one but each has it's good ideas. I'm thinking of bringing over the PTO from Soldersmoke to this design just for fun (or perhaps over-thinking it and adding an Si5351 VFO!).

Here's the schematic.


(Click to enlarge).

Wednesday, September 23, 2026

Tech Talk on ABC Radio - AI dangers and opportunities

AI is moving beyond being a tool we use into systems that can make decisions and act autonomously. There are growing questions about how much control we have over them. 

Prime Minister Anthony Albanese in the US talking AI at the United Nations, and Nightlife looks at where this technology is heading and what it could mean for all of us. 

Peter Marks, software developer and technology commentator from Access Informatics, joined Philip Clark and listeners to Nightlife with the latest tech news and information. You can listen here.

Tuesday, September 22, 2026

Some terrific club events

I've been a bit quiet here on the blog recently, in part due to some excellent club events I've been involved with.

The Macedon Ranges Amateur Radio Club had a great meeting with two fascinating talks.

Beekeeping Meets Radio: Building a LoRa Network for the Apiary

Bouncing Light Off Clouds: 357 km Across Bass Strait on 730 nm

The Radio Amateurs Old Timers Club had:

Melbourne ATV Repeater VK3RTV A Brief History – the journey from Analogue AM to High Definition Television by Peter Cossins, VK3BFG.

We are lucky to have so many excellent speakers and events here in Victoria, Australia.

Friday, September 11, 2026

My longest distance FreeDV RADEV1 contact 14,342km

There have been reports recently of 20m openings so I left WSPR receiving and noticed the US was coming in. Switched over to FreeDV RADEV1 using my macOS version of the software called FreeDVNeo. Keyed down and on Reporter I could see that Dudley WA5QPZ in Austin Texas was receiving me. Not perfect copy, but not bad either.


Also, I'm running the release candidate of macOS 27 Golden Gate which will be out in a few days. So far it seems stable and fast.

Thursday, September 10, 2026

Robert Glasser - my 97.5 year old uncle, friend and radio amateur has died

Sad news that my 97+ year old uncle Robert Glasser, ex VK3QA & VK3DRG, has died after a fall at home. Robert was my first exposure to the ham radio hobby which has been a much loved part of my life. He had a tilt-over tower in the back yard (which he referred to as "my erection") with a beam for 20m when I was a child.

It's a credit to his kids, my cousins, Tracey and Paul, that Robert was able to stay at his home (with visiting carers) until just about the end. I know he appreciated that very much.

I would visit every few months when in Melbourne to catch up with friends and he was always excited to see me and hear about the evolution of ham radio technology. Once I dropped in on the way back from the Rosebud Radiofest and gave him a copy of the 1956 ARRL Handbook. He leafed through it and exclaimed "nothing's changed!". 


On another visit I brought along an IC-705 and showed him the waterfall display. He was impressed.

In later years he had a 2m radio but rarely was on air.



Robert, and his wife my dear aunt Peggy (who was an amazing person in her own right and the subject of this ABC program), were always kind and encouraging to me as a child and rather lost teenager. 


I asked Robert about his ham radio history during a visit in 2025.

Robert got his amateur licence when he was seventeen. You had to have morse code which he had known from childhood. The morse test “wasn’t too much of a problem for me”. 15 words per minute. People would buy tapes, punch tapes, to learn the code.

Callsign was W6HWA “Hard working American”

An early transceiver he owned was a Hallicrafters SR-150. He may have had a Collins KWM-1.

He had a three element beam for 20, 40 and 80m.

At Albany road he had a tilt-over tower with a beam that did 20 and 10m.

At seventeen, Robert lived in California.

Robert had contacts both locally and overseas. Mostly just calling CQ rather than regular nets.

I showed Robert a QMX transceiver. He was amazed at the size and the fact that it did multiple bands including 80m.

We discussed the difficulty of soldering to enamelled wire used to wind toroids.

We discussed QST magazine and the ARRL.

Robert moved to Australia in 1950. He rattled off a series of addresses in California where he had lived.

We discussed WSPR beaconing and low power operation. There had been a large solar flare in the last few days.

Robert commented “how times have changed!”.

Henry Radio was a shop he used.

Robert asked if the ham radio license is easy to get these days. We discussed the levels and the fact that tests are now multiple choice rather than essay.

“A lot of water has gone under the bridge”.

Robert’s dad was a real estate broker in California. Mainly houses. Beverly Hills. Beachside communities.

I mentioned the Palisades where there have been fires. Robert said he lived there at one point but got out in time. 

Robert’s older brother had married a girl from Melbourne and he came out to visit his brother. His brother was nine years older. He introduced Robert to Peg who he used to produce on radio. Robert just stayed in Australia after that. He can’t even recall going home for a visit (but he must have). 

“Time marches on, we’re all getting older.”

Farewell dear Robert. I will always remember you. Ex W6HWA , VK3QA & VK3DRG SK.

Wednesday, September 09, 2026

Tech Talk on ABC - with Cat Marks

Close readers of this blog will have noticed that I do a national radio talk about technology every fortnight but this week I was away on a hike. The program was looking around for someone to contribute the spot and went for my daughter Cat. 

It might be seen as nepotism except for the fact that she's much more qualified and certainly smarter than me. Here's her spot: 

The UK has just taken its first step into the Robotaxi era, with Wayve's self-driving cars now available to book through the Uber app; but there'll still be a licensed human driver in the front to take over if needed. 

Communications Minister Anika Wells has announced that the draft Digital Duty of Care law will be introduced into parliament this week, including a requirement that platforms offer the ability to 'opt-out' of their algorithms. What does this all mean?

Cat Marks, data scientist and Principal at Ember Advisors, joined Philip Clark and listeners to Nightlife with all the latest in tech news. Listen here: https://www.abc.net.au/listen/programs/nightlife/nightlife-tech-cat-marks/107131014