Hello and welcome to the 505th installment of Linux in the Ham Shack. In this short topics episode, the hosts discuss efforts to mitigate QRM, licensing for eLoran frequencies, Project Boondock, Wine integration with Wayland, Azure Linux, the Dolphin project and much more. Thanks for listening and have a great week.

73 de The LHS Crew

In this episode, we join  Martin Butler M1MRB, Chris Howard (M0TCH), Martin Rothwell (M0SGL), Frank Howell (K4FMH), Bill Barnes (WC3B) and Leslie Butterfields (G0CIB) to discuss the latest Amateur / Ham Radio news. Colin Butler (M6BOY) rounds up the news in brief and in the episode's feature is Intro to Spectrum Analyzers.

We would like to thank Martin Malley (WØZZK) and our monthly and annual subscription donors for keeping the podcast advert free. To donate, please visit - http://www.icqpodcast.com/donate

• New SO-50 Distance Record
• NCDXF to offer $100k for solutions to deliberate QRM
• Cars Would be Required to Keep AM Radio under a new Bipartisan Bill
• ACMA Licencing Update
• Hamfest India
• Museum Ships On-the-Air Weekend
• AMSAT Orbital Elements Manager Retires

Do we need those inline fuses between our radio and power supply, most if not all radios come with them but are they always needed? There was a time when I thought the more fusing the better and safer, but does it add to the safety or is it just redundant fusing? First off let me begin with, this is my own opinion and I do follow it whether you choose to or not it is absolutely up to you. 

I was having an issue with my Icom 7610 cycling off and then back on again while transmitting . The issue was narrowed down to resistance within the cable from the power supply to the radio. I first replaced the poor terminal connections on my Astron power supply. The issue returned again it was then further determined that the guilty party was the inline fuse/fuse holder connection. I cut out both inline power cable fuses...OMG, you say?
Well, not really if (the big if) you have a power supply with very good built-in protection meaning over-voltage protection (crowbar), over-current protection (fold-back current protection), over-temperature shutdown and an internal AC fuse I believe you are good to go without inline DC fusing between power supply and your rig. Again in the background I hear "OMG, you did what"

I do hear some saying "Wait what if there is an issue in my supply line from the power supply to the rig" This is true BUT keep the power cable as short as possible and if you have worries about overheating cables, moving parts or rodents then you have bigger issues than un-fused power cables. Having said that if something between the power supply to the radio power cable causes a sudden increase in current or voltage the power supply protection will quickly look after that. 

 Some who have a large rig such as the Icom 7610 or other manufacturers could be saying "there is no way this rig will be used as a mobile by the average ham but it has fused leads". My answer to that is the big 5 (Icom, Kenwood, Yaesu, Flex and Elecraft)  have no idea what power supply you are going to use. Also, some may opt to use a deep cycle battery at home on a trickle charge or whatever. 

After everything I have said about fuses I am not against them and as a matter of fact I have a Rigrunner fused rail and use it and I am thankful for it. I connect my external ATU, noise cancelling unit and SWR meter (for the light) to it. 

Now if you have no issue with your supplied power to your radio and things are not acting up like they were with me then by all means keep the fused line but for me, some radical thinking cured the problem and some power supply understanding allows me to sleep at night knowing the radio is in good power supply hands.

Ham College episode 101 is now available for download.

Extra exam questions 39.
E8A AC waveforms: sine, square, and irregular waveforms. AC measurements, average power and PEP of RF signals, Fourier analysis, analog to digital conversion: digital to analog conversion, advantages of digital communications.

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 I wanted to thank the Dutch PACC contest committee for a nice participation ribbon that arrived today. It was the first time I took part in this contest and it was well-attended and fun. When I looked up my log results I was not able to find them at first. I later clued in that I entered as SOAB low-power MIXED! I have to pay closer attention as I was and always am CW and not mixed.

This past weekend we had record-setting temperatures and amazing weather! Unfortunately, I heard the call of the wild and not what contesters call "Butt in chair" My name was being called from many directions..the BBQ, the deck chairs, sunny skies and later in the day a cold beer. This was a small still voice of the CQ WPX contest but at times was silenced by the fair day voice. I chose to mostly enjoy the day as there will be more contests and over the summer I will get tired of the very warm weather. 

The contest conditions when I was taking part were filled with QSB and many repeats of progressive serial numbers. For the time I spent in the contest I was happy with my results and I could tell that my consistent contest practice is paying off. I can copy much faster and more accurately. In all CW contests that involve numbers in the exchange, many stations will send what is called cut numbers. These are letters in place of the actual number. The most common are 9 (N), 1 (A) and 0 (T) there are some others but these are the most common. Why am I telling you this.....well for the first time I heard a station ID his call with a cut number. As an example, my call VE9KK would be sent as VENKK. Most contest rules if not all do not allow this as well I would think the telecommunications governing body of the country they are from would not be pleased. As always I entered the contest as Low power (100 watts or less), unassisted (did not use spotting assistance) single operator and single transmitter. I used my Icom 7610 and Hustler 4BTV vertical antenna.