A Woman’s Prerogative

I was originally going to archive this blog and made an announcement that it would not be updated any longer. Then I changed my mind. I am sorry to say that many of the older posts have lost YouTube content due to me deleting my YouTube account. I could not bear to see myself, such is the nature of gender disphoria.

I have now decided that this blog should become my own again. I changed the  name of the blog to match my new callsign. There is not much I can do to change the old posts to match my affirmed gender nor my new name.

I have moved from acreage in a regional city to a one bedroom apartment in Australia’s largest city. My partner and I lost our business, almost all of our possessions and personal wealth due to my depression, anxiety and panic attacks due to gender disphoria. My new location, housing arrangements and budget mean that I will not have the impressive station that I once had. I will have to find new ways to operate and new interests within amateur radio.

For those of you still interested in what I post, thank you.

(I have since moved to Gunnedah NSW where I can pursue my gliding goals)

Kimberly  VK2KMI/VK4KIM ex VK4MDX

The Facts on Australian Coal Fired Power Stations

Please don’t talk politics on amateur radio. If you are stupid enough to do so. Know your facts.
Coal-fired power stations remain the dominant source of Australia’s fine particle pollution PM2.5 (25% of the national ‘all sources’ total), oxides of nitrogen NOx (25%), and sulfur dioxide SO2 (49%) – some of the air pollutants most toxic to human health


Longer Term Assessment of the Nested Marconi Antenna

It is fair to say that I’ve been very happy with the performance of the Nested Marconi antenna to date, but I’ve not spent a great deal of time on bands other than 80m and 40m, where the nested Marconi performs really well. While the SWR is fine on all bands (except 160m), the performance has not really been explored by me.

Recently I tried it out on 20m, using the additional 10m/20m attachment and I found the performance much reduced compared to my ZS6BKW. 15m and 10m seem similarly reduced but I really need to do more on these bands to make a real assessment. .If you have a small yard, this is a great antenna but I’ve found it lacking on 20m. Today I made a coil for 160m (44mH) and it does allow me to tune it to 160m. I’m yet to test it out.

Here is my work to get it on 160m

Audio interface for the Icom IC756ProII

Today I spent some time modifying the audio interface that I used to use with my Icom IC706MKIIG, so that it would work with the IC756ProII. I removed the 13pin DIN and replaced with with an 8 pin microphone plug. Unfortunately I didn’t’ have much cable so I had to make do with what I had. The box contains two 6.5mm phono sockets wired up to the microphone plug. One socket is for PTT, the other for audio. PTT is operated via foot switch. It is important when setting up something like this, that you adjust the microphone gain, and mixer so that your ALC is as per the manufacturer’s recommended settings.

New Radio, Moving QTH and Ameritron Repairs Continue

I’ve been off air for some time because I’m restarting my business, Learn to Tow at http://www.learntotow.com.au. I deliver towing training on weekends. I’ve also got a new full time job at Cessnock, so once the COVID situation changes I’ll be moving house. Meanwhile the Barrett 950 had to go into the 4WD, so I needed a new radio. I managed to get my hands on an ICOM IC756ProII which I’m loving. It is now time for me to finish off the repairs and modifications to the Ameritron AL811.

What Purpose the Zero Ohm Resistor?  ICOM IC-703 Antenna Socket

“Always walk through life as though you have something new to learn, and you will.”

Due to delays waiting for parts for my Ameritron AL811 project, I decided to start on another repair job that has been awaiting my attention. Last time I used my Icom IC-703 there was no power out on transmit. I suspected blown finals- that will be a painful repair job with SMDs! But today when I attempted to power it up, it was completely dead. I opened it up and checked the internal fuse; it was intact. I checked the rectifier diode a DSA3A1. It was dead. Hmm Why a rectifier diode on a dc supply? I guess it is normal to use these where there may be a fairly decent current (direct connection to a car battery for example) and to provide reverse polarity protection from that current.

So OK but why no transmit when it was powering up? A closer look revealed a little teeny resistor that runs from a track on the PCB, to the centre of the antenna socket has come away from the PCB. It had broken off and left the tail embedded in the board. This thing was tiny! I had to desolder the antenna socket anyway, to get access to the bottom of the board, to remove the diode, so I set about doing that and flipping the board. That is when I saw this tiny resistor. It had no coloured bands at all but it looked to me to be a resistor. I searched the Icom Service Manual and found it on the PCB drawing, labelled W999. The table of components told me it was generally referred to as a Jumper ERD-S2T0. Searching this info online I found that it referred to a zero ohm resistor. Now that got me really thinking. What possible purpose could be served by a zero ohm resistor? Why not just a short wire?

The answer may well not surprise you, it didn’t me. The answer is speed, time and cost in manufacturing, especially if that manufacturing is done in part or completely by robotics. The part has no electronic purpose.