Amiga 1200 upgrade

March 26th, 2015

Blizzard 1220/4 for Commodore Amiga 1200Until recently I had a Marpet 1207 RAM card installed on my A1200. It worked well, but I encountered a Blizzard 1220/4 on eBay at a good price. I received it, and replaced the CR2020 battery, I installed a 40MHz 68882 FPU and 40MHz crystal with I soldered directly to the board for best chance of reliability. I also soldered the jumper that switch the FPU speed to 14/28/OSC speed/or off.

Blizzard 1220/4 Sysinfo BenchmarksThe Blizzard 1220/4, whilst not the fastest accelerator in the world, is a very compatible one and it gives one’s Amiga a modest yet noticeable boost. The MC68EC020 25MHz CPU running at 28MHz (double standard clock speed), gives a great Amiga experience.


Commodore / Escom Amiga 1200 / A1200

Completed Amiga 1200 in my shack


M0SAZ Shack Update

March 26th, 2015

Yaesu FT-857DI have had a little change around in terms of layout and I have also sold the MD-200 microphone and replaced it with an MD-100. The MD-200, perhaps because of its high fidelity, I struggled getting anything like the power output I had the radio set to unless I put the mic gain up particularly high. The MD-100 “excites” the radio so much easier yet still produces a high quality audio. Happy with the setup. Enjoy the photo!

Initially perplexed by Android Lollipop on HTC One

March 6th, 2015
Application Organiser on HTC One

Application Organiser on HTC One

Following the update to Android 5.0 on my HTC one, I discovered Chrome no longer has a tab button and instead there’s app organisation buttons for the latest version of the OS that Chrome (and other apps) makes use of, on the bottom of the screen.

However, on my device I couldn’t see these buttons. I assumed HTC Sense had removed them but some webpages were saying they are restyled on the HTC but are still there. I tried everything until I finally found a site that said double clicking on the phone’s own home button will activate the application organiser where you can switch between and close tabs as well as other running apps.

Happy to report that worked and I can now use this new feature.

The Amiga and Ham Radio Man Cave Lives!

January 27th, 2015

Looking great. More tales from Mike / A1200 / M0SAZ soon!

A1200 FT-857D

A1200 Magic Workbench Screengrab

All change at the M0SAZ home QTH

January 7th, 2015

I have changed my radio recently. I am now armed with an FT-857D with TCXO and filters. I also have simplified my Antennas, without compromising on performance. Now I use a HyEndFed 5 band antenna for HF (all bands possible with my ATU) and a Diamond X50N for VHF/UHF. Despite the simplicity, I am enjoying the station very much. I have been using my Amiga A1200 more recently. I replaced the A600 in the shack for the A1200 some time ago.

Some photo’s of the changes (click to enlarge):

HF and 2m/70cm Antennas at M0SAZ QTH

Antennas at my QTH

M0SAZ QTH Shack Setup Yaesu FT-857D

My station setup

Amiga A1200 System in M0SAZ Shack

Amiga’s Power! Picture taken before FT-817ND was replaced with the FT-857D.

Yaesu FT-817 & FT-817ND owners resources

September 2nd, 2014

FT-817NDCalling all Yaesu FT-817(ND) owners! New resource has gone live – IRC channel ##ft817 on Freenode. Use it to talk about this great little radio, sort our problems or arrange QRP skeds! For those without IRC client software, you can use

Other established Resources:

FT-817 Yahoo Group

FT-817 Google+ Community

A “self mounting”, sturdy, multi-band base HF vertical antenna practical solution.

August 9th, 2014


Since being licenced, I have always run modest HF antennas at my home QTH. I was restricted in physical space at my previous home and at the new location I have more space for slightly larger antennas, but decided to keep the setup stealthy to reduce the risk of complaints from neighbours.

Antennas at my QTH, Western HF-10 (HF), Diamond X50N (V/UHF).

Antennas at my QTH, Western HF-10 (HF), Diamond X50N (V/UHF).

I have always tried to have 2 antennas installed at any one time; a horizontal and a vertical. I have had great successes with horizontal antennas, the Alpha Delta DXCC, G3TPW Cobwebb and my current horizontal Antenna, the Western HF-10 have performed very well indeed with no issues mechanically. The Western has been a loyal servant to me since moving into this house. On 80/40/20m especially, I cannot rate it highly enough.

Whilst the aforementioned antennas have been excellent and remained in service at the station for some considerable time, I have always struggled to find a vertical I have been happy with. Why have a vertical? Well propagation is one reason; often signals are stronger when switching between a horizontal and vertical. Also, I think having a spare antenna is great if you want a bit of redundancy from a damaged antenna or feeder. Lastly, FM repeaters on 10m and 6m will be horizontally polarised, as will FM simplex contacts as a rule of thumb. So a vertical of some description is worthwhile.

Most verticals I have tried have been rather short in size which has a performance issue from the outset. There are larger verticals on the market, a few of which I have tried but they have always disappointed as they have either required significant wire radials to perform or they are so long they need guying which is both ugly and impractical for my station. In most cases they are expensive.

Then, recently I read a book “How to listen to the world” by Ken Reitz KS4ZR. An excellent read, aimed mainly at people new to ham radio and shortwave listening but there is a lot of interesting information in there, especially regarding broadcast AM and receiver equipment which would interest the OMs as well.

2” Aluminium mast mounting

2” Aluminium mast mounting

In Ken’s book he recalls not being ready for field day and as the start time loomed, improvising an antenna by hooking his ladder to his ATU and it ended up working rather well! This got me thinking about my vertical issue and I have found getting lots of metal in the air certainly is an advantage with a vertical but it then gets into all sorts of difficulty as mentioned – swinging in the wind and ready to snap as soon as a heavy gust of wind hits it. That or we guy the antenna, creating cheese wire type hazards all over the garden.

That’s when I thought, I wonder if the mast that has played host to several lacklustre vertical antennas and currently just supports one end of my wire antenna would actually work as a HF antenna? Well, the cogs started turning and after some thought, I decided I would try.

Soon after the build began. In addition to the mast itself, I would use a 9:1 UnUn and an earth spike in the ground to create the antenna. I assembled the antenna with the radiating side of the UnUn connected to the mast via a short length of flexweave, attached to the mast by nut and bolt and washer, all waterproofed with silicone sealant. I also waterproofed the connections to the UnUn by wrapping the entire thing in self-amalgamating tape.
My masts I use now are a slot together affair but that was just for ease of shipping, I have also had a single length of pole in the past which would logically make no difference when using as an antenna. The 2” diameter aluminium pole is supported by 2 galvanised standoff brackets, attached to my garage-come-shack. This particular mast has a length of 9m in height and is mounted about 1 meter off the ground.

I set to work, building the simple antenna with a pre-built UnUn from my Pro Whip Antennas 10m portable antenna. I added 7 turns to the RG-213 feeder cable to act as an RF choke and once completed, I attached the other side of the feeder to my MFJ antenna analyser. No band showed a SWR of over 3.1:1 and most (including 160m were between 1:1 and 2:1).

Connections to the UnUn – flexweave to the mast and to the earth spike.

Connections to the UnUn – flexweave to the mast and to the earth spike.

OK so we know just because the SWR looks great it doesn’t mean its going to be a particularly efficient antenna. However on something like the 20m band this near ½ wave antenna is particularly “hot” and when switching between this and my Western HF-10, there were occasions where the vertical did outperform it on receive. It “gets out” too. My first contact was on 14.290MHz with OH1TD 59 report; I was using 60 watts. Later that evening I worked SP8K and OE5XJN on 20m and SV7LNX/P on 40m using 100 watts who gave 59+5, 57 & 55 reports respectively.

One thing with verticals, they are generally more susceptible to atmospheric noise. This design is no exception. I found listening to the chaps on 1.933MHz rather difficult to hear on the vertical but the Western HF-10 received them better, mainly because of the reduced noise floor. The Western HF-10 is advertised as top band capable but I haven’t been able to get mine high enough or the ladder line vertical to allow for this. The solution is to use the vertical for transmitting and the Western for receive, achieved in my case by pressing the Ant A/B button on my LDG ATU when switching between TX and RX but could also be done with the A/B antenna switch on some radios, or using the RX antenna jack on others.

I am more relaxed when the wind is up now because, there is no weight being supported by the 2” aluminium pole other than the pole itself, so it would take an apocalypse type event or a strategically positioned lightning bolt to bring this antenna down. Additionally I have the accolade of being able to say I am using a homebrew antenna too, and it only took a few moments to build!

Photo showing Western HF-10 and Diamond X50N from other side.

Photo showing Western HF-10 and Diamond X50N from other side.

So, next time you are looking for a simple HF vertical, and with bad weather a part of life for most of us on this turbulent planet, why not look up at what your VHF/UHF collinear or small HF compromise antenna is actually mounted on and ask yourself:
“Is the mount actually a better antenna than the antenna?”

Update 05/10/2014: I have now added 3 radials to the “earth” side of the UNUN, which seems to have helped with the noise a little and from casual observations seems to be bringing up in performance a little more.

The Axeman is back!

May 17th, 2014

After many months of not having a station setup, I have finally gotten around to getting back on the air. The house purchase took 5 months to complete and (apparently), you can’t move in and setup radios and antennas straight away! When I first decided to buy the house, I thought of large beams and a “man size” antenna farm, but after getting a feel for the village tolerances and my own appreciation for the view at the back of the house, I decided to keep my station reasonably stealthy.

Antennas consist of a Western HF-10 and Sandpiper MV5+3 for HF and a Diamond X50N for 2m/70cm.

Some close ups of some of the installation (click on the image to enlarge):

M0SAZ Amatuer Radio Station Detail

Originally I was going to setup my shack in one of the bedrooms I had made into the study but it turns out that was incompatible with my XYL’s plan, so I settled for the garage which has been partitioned insulated, carpeted and blinds fitted, as well as a patio door added to the rear (not all my work, a previous owner had a sewing studio in there). It turns out the garage is great as routing cables and doing adjustments was a lot simpler. It also makes testing portable antennas from the garden a good deal easier.

Here are some photos of the finished antennas (click to enlarge):

M0SAZ Antennas

Antennas at the M0SAZ QTH

Ham Radio Antennas DE M0SAZ

And finally, a picture from inside the shack (click to enlarge):

M0SAZ Amateur Radio Shack

How well does it work? Well its early days but I can access all the local repeaters on 2m/70cm and heard G3LDI and the participants of the Morse training on 145.250 simplex with no problem. On HF, the 1st 3 contacts were Algeria (Sandpiper), East Sussex (Western), and Alaska (Sandpiper). Hopefully we will get a good summer for radio! See more information on my QRZ page.

New Amiga in the shack

November 17th, 2013

I was planning my new shack for when I move into the new house and thought it would be nice to have a little A600 for IRC and other Lo-Fi Internet tasks, so I can chat whilst doing various tasks on the A1200 which can involve rebooting if in a game or demo or something I am trying out crashes. So I bought a few A600’s from eBay and picked out the best condition case and latest version motherboard from the ones I acquired and added some modest upgrades. Here is a quick storyboard of the upgrade process. You can click on an image if you want to make it bigger.

Amiga 600 3.1 ROM

Chose this revision 1.5 motherboard, and added the 3.1 ROM so we can run Workbench 3.1.









Amiga 600 Case Floppy

The A600 motherboard is sitting in the case and floppy drive is now added.









Amiga 600 top RF shielding

No Wait! I am a radio ham, let’s put the often omitted top RF shield on – keep RF interference to a minimum.









Amiga A600HD Upgrade

Now the shielding is on, we can replace the motherboard in the bottom case and attach the floppy disk drive once more.









Amiga 600 HDD Hard Disk Drive SSD Flash CF

We now add a 512MB Solid State HDD known as a Disk on Module or DoM. This is an industrial model with a wide operating temperature. It attaches to the IDE pins directly but we replace the HDD caddy to give the A600 keyboard extra stability.










Amiga CHIPMEM RAM 1MB 2MB A604n 600 Fast memory

Here we add the extra 1MB CHIP RAM expansion to give us a total of 2MB. This is a modern board made by Individual Computers – A604n. It also has the optional RTC board which plugs into a clockport on the expansion board.










Amiga A1200 Key board. Amiga 600 keyboard.

Just sizing up the keyboard… The A600 doesn’t lay on top like the A1200, instead it clips into the top case. But I thought I would show it in position anyway.









Commodore Amiga A600HD released 1991

All done! Keyboard and LEDs are attached to top case and we close our patient up. Notice I managed to source an A600HD labelled case.










Amiga white case & keyboard photo

Looking good! Its hard to get hold of Amiga machines this white nowadays. If you have a yellow one, you can try making a cleaning solution known as Retrobrite which can remove a lot of yellowing. Luckily I don’t have to for this machine.











Amiga External Disc Drive. Rear ports.

Rear ports – Disk Drive, Parallel, Serial, Audio, RGB, Composite Video, RF, and power. Toby the cat, who up to this point had been helping me, decided to take a nap.








Amiga PCMCIA NIC 10/100 Ethernet Wi-Fi RJ45

The other side of the case clearly shows the A600HD label and the PCMCIA port which will be the host to a 10Mbit Network card.









CBM UK Commodore Business Machines Amiga

The underside shows the Commodre installed 64MB hard drive and some QC check from Commodore UK. It was checked by L Robinson on the 15th May 1992. I wonder what he/she is doing now?










Amiga 600 Computer Upgrade Test Installation Hardware and Software

Time of truth. And it works! Result. I have connected the A600 to the TV via SCART for a crisp image. Unfortunately, all my Workbench and other discs are in storage, so we will have to do some more when I get the keys to my house. Shouldn’t be too much longer.












There you go, all done. It is not the most ambitious A600 upgrade ever (this website used to be about a much more upgraded machine), but this machine should be stable and reliable and more than able to do what I have planned for it. I did not replace the capacitors that have been known to fail on some of these machines but if I notice any instability issues moving forward, I will perform the exercise.

I am hoping that one day I can do some ham radio things with this A600 or with my 68030 powered A1200. That would be cool. I would also like to write a book on one, as in Word Processing a book using the Amiga – not writing about an Amiga (or maybe I will). Thanks for looking at my little project, that took just as long to chronicle as it did to perform the upgrade procedure!

Coming Soon…

January 9th, 2013

We are back…

Phase5 Blizzard 1230 MKIV