AmateurRadio.com

Once again our quiet English backwater of West Cumbria is in the news for the wrong reasons, this time after hitherto mild mannered taxi driver Derrick Bird went on the rampage with a sniper rifle killing 12 people and injuring 11 others – many apparently for no reason other than being in the wrong place at the wrong time – before killing himself. This kind of event is traumatic at the best of times, but in a sparsely populated area there are few people who don’t know, or know someone who knows, someone who witnessed or has been affected by the atrocity.

Britain has very strict gun control rules. Gun owners have to give good reason why they need to own a weapon and confidential enquiries are made as to their soundness of mind before granting permission. Derrick Bird had apparently legally owned his weapons for 20 years. But understandably questions are now being asked as to why people who have no professional need to own weapons capable of such carnage should be allowed to keep them in their house.

The sporting guns lobby has reacted with, it seems to me, rather disrespectful haste, to stem cries for even tighter controls, using arguments such as banning guns would make it impossible for Britain to host the Olympics. I doubt if the relatives of the 12 innocent people who were killed could give a damn about the Olympics at this moment.

There are many other silly arguments being raised against tighter controls. It is argued that much gun crime is carried out with illegally owned weapons, so making it harder to legally own one wouldn’t make a difference. But if Derrick Bird and others who use guns in crimes of rage or passion had to obtain them illegally first they would probably just resort to shouting or using their fists like the rest of us.

Another daft argument is that cars can kill and no-one advocates banning the use of cars. But quite apart from the fact that cars are useful to almost everybody whilst guns aren’t, it is also true that serious road accidents are examined to see if road safety legislation could be improved in order to try to prevent such accidents in the future. So I think that examining the laws regarding gun ownership is entirely appropriate.

If people own guns solely for sporting reasons, do they need to keep these weapons at home? Perhaps they should be securely kept at a licensed gun club or a police station and signed out for a specific period of time and purpose.

If Derrick Bird had not been able to get his hands on his weapons whilst he was thinking murderous thoughts, 13 people would still be alive today and 11 more would not be in hospital. Can anyone seriously argue that their sporting freedom is more important than that?

When using a hand held radio with a long whip antenna for more gain I often prefer to use a speaker mic so I can hold the radio in a steady, upright position. I have a speaker mic for the Kenwood TH-F7E (which fits the old TH-205E as well) and I have one for the Motorola GP300. But needless to say neither of them fit the Intek H-520 Plus 10m rig because the wiring and pin spacing is different. The official Intek speaker mic is rather expensive so I looked on eBay and found a speaker mic for “Alinco Icom Standard 2-pin” with the correct pin spacing for less than £7 including postage from Hong Kong.

When it arrived I decided to check what the audio sounded like by listening on the K3 while I made a call. The mic keyed the radio up but there was no audio. To make troubleshooting easier I swapped the antenna for a dummy load and audio was then heard!

I then tried a variety of different antennas and power levels and was soon pulling my hair out. I would hear audio with the dummy load connected and none as soon as I switched to an antenna. Eventually I tried the very short antenna supplied with the H-520 on the lowest power setting, 0.1W and I heard audio. It was looking very much as if the presence of radiated RF was somehow interfering with the audio. But the amount of RF required to cause the problem must be small as 0.1W on any of the larger antennas resulted in no audio from the speaker mic.

I didn’t know whether the RF was causing a problem with the microphone or the radio. I tried clamp-on ferrites at both the mic end of the cable and the plug end but neither made any difference so I was none the wiser. This particular made-in-China speaker mic is held together with screws that require a nonstandard five pointed key to undo so I couldn’t look inside to see if it used screened cable. I decided to give up on that speaker mic and do what I could have done in the first place if I hadn’t thought spending seven quid would be an easier solution.

In my junk box was the business end of another cheap Chinese speaker mic from which the cable had been ‘borrowed.’ I noticed in the past that the curly cables used for these speaker mics are often not screened. I happened to have a length of stereo audio cable with each channel separately screened. I wired this up to the spare speaker mic and attached suitable 2.5mm and 3.5mm jack plugs to the other end. When I tested it I now had transmit audio even on high power with the 4 foot telescopic whip!

At this time I don’t really know whether the mic I bought was at fault because I don’t have another radio that uses the same size plug spacing to test it with. Given that I have been less than impressed with other aspects of the H-520’s performance I wouldn’t be surprised if it wasn’t the radio that has inadequate filtering for RF picked up on the speaker mic cable.