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Edward George Bowen AWA Newsletter #48 December 2009 A Member Reflections: of the SARL Things are really warming and whistles and can even using. “That sounds pretty up, the bands, the weather switch the kettle on for us. impressive,” the voice on the and even the shops, as all other end says. “This side We get with it, a fully syn- start to gear themselves using a homebrew QRP rig Antique thesised 1Kw linear which up for the “silly season”. running 1 watt into a in- Wireless Association will be programmed to only verted V at 6m”. Who do you I call it this because it just put out 400w maximum of Southern Africa think is getting the most seems to me this is the (Ha Ha) and buy a log peri- enjoyment out of his hobby ? time of year when every- odic beam that does all the one who was at least a frequencies. That’s what I love about little bit sane, tends to valve rigs and old Boat An- Inside this issue: We get on the air, switch in lose it all. chors. They give you as the graphic equaliser, CW Net 2 much enjoyment as the QRP We’ve reined ourselves in speech processor and DSP homebrew rig because you up until now. Not over- with automatic noise got it up and running after a SSB Activity 2 spent or maxed out the blanking and signal en- long arduous struggle of credit card. Kept the hancement like you have cleaning and refurbishing. spending of extra cash to a never seen, and call CQ. AM 2 Then you still had to tune it minimum. Now comes Even the lights in the properly so it gives you A Visit To Duxford 3-4 that time of year when we house dip. spend all that hard earned maximum power out. We call CQ again and a money on things like trips Whatever your need, what- station comes back Taffy Bowen 5-8 to Mauritius, the Sey- ever your preference, do “ZS6XYZ, this is ZS1XYZ, chelles, or maybe even have a happy “Silly Season”. you’re running a 5/9 here Europe. We buy the most in to Cape Town”. You go exorbitant presents for Notices 9 back and tell him he’s run- those nearest and dearest Best 73 ning a 5/9 to your QTH as to us. Look for a good, well and then proceed to De Andy ZS6ADY brand new plug and play give him the run down of rig that has all the bells all the equipment you’re Wikipedia—The Resistor Carbon composition resistors consist of a solid cylindrical resistive element with embedded wire leads or AWA Committee: metal end caps to which the lead wires are attached. The body of the resistor is protected with paint or plas- tic. Early 20th-century carbon composition resistors had uninsulated bodies; the lead wires were wrapped ∗ President—Rad around the ends of the resistance element rod and soldered. The completed resistor was painted for colour ZS6RAD coding of its value. ∗ Technical—Don ZS5DR The resistive element is made from a mixture of finely ground (powdered) carbon and an insulating mate- rial (usually ceramic). A resin holds the mixture together. The resistance is determined by the ratio of the ∗ Net Controller—Willem fill material (the powdered ceramic) to the carbon. Higher concentrations of carbon, a weak conductor, ZS6ALL result in lower resistance. Carbon composition resistors were commonly used in the 1960s and earlier, but are not so popular for general use now as other types have better specifications, such as tolerance, voltage ∗ Newsletter/PRO— dependence, and stress (carbon composition resistors will change value when stressed with over-voltages). Moreover, if internal moisture content (from exposure for some length of time to a humid environment) is Andy ZS6ADY significant, soldering heat will create a non-reversible change in resistance value. These resistors, however, if never subjected to overvoltage nor overheating were remarkably reliable. They are still available, but comparatively quite costly. Values ranged from fractions of an ohm to 22 me- gohms. Page 2 AWA Newsletter CW Net: With the change coming about in the encourage those who have been waiting bands and some rather improved condi- for some change in the bands, that it has tions, we have seen a few of the old CW happened. If you don’t get on the air now, enthusiasts return to the frequencies. How you’re going to miss it. wonderful it has been to hear John ZS6JBJ I wonder if there are any stations out there coming back with 599 reports from Wit- thought of trying to get WAZS in the CW bank after a long dry period of no contacts mode ? I was looking at it the other day at all. and thinking this will be quite a challenge. John ZS5JON in Durban has also been Especially today, not using all the previous HK 802 absent for a while as have a few others contacts on CW from 10 and 15 years ago. who now come up regularly. Forgive me if Are there still 50 plus CW operators in netted a total of 29 entrants. Lets hope the I don’t mention all the call signs, but it is Div 6 ? This would be a challenge on it’s next one will be much better attended. so nice to go and sit in the shack on a Sat- own. urday afternoon now, at least knowing To coin a phrase “CW, the gentleman's art there will be a few of us up on the CW net. Early in February we have the AWA CW of communication”. (Thanks Ian) activity day over a period of 24 hours. I cannot help but thank those old Faith- This would be a good time to try and full's who have sat through this dry period gather as many call signs as possible to- De ZS0AWA/CW …-.- every Saturday, even if just to come up wards the illusive “WAZS CW”. The last and say hello. Now of course we want to one, which actually was the first one, only SSB activity: Although the bands are slowly improving on region, to use 80m (3615). It doesn’t help So come on guys, work with us on this one further stations, the closer stations don’t that you can hear the Div 2 and Div 5 sta- and use the 80m relay. seem to be able to break the back of it. Div 5 tions or even Z2 stations. If the control sta- and 2 are certainly working well on 40m, but tion can’t hear you, then we can’t call you in, stations closer to home are not making the S5 nor can we relay you for the rest of the guys levels. If you can’t work them on ground who can’t hear you. wave, then you can’t hear them properly. It makes sense, well to us anyway, to use Willem and myself have been finding it in- 80m if you are close enough for it to work creasingly difficult to hear each other on for you. The 80m relay was put in place spe- 40m. Dave ZS6MUS is quite readable to Rad cifically for that reason, and it does work. in Midrand, yet to Willem and myself, we Just ask those who do use it. have difficulty copying him. No offense to Yes we are all hoping the 40m band will you Dave, just using it as an example. improve so well that we will all be able to So what is the solution ? Once again, we work on it without having to relay. But at the Drake TR-4C need to encourage the local guys, Gauteng moment that is not possible. AM: The AM net has had a few surprise visits the net, so now here’s your opportunity to we cannot hear him too well, but there are during the month which have been quite give us some feed back. We know the guys also times when he is heard with a good Q5 welcome. Om Derrick ZS5DM, and Garth will all appreciate some reports and find out readability. ZR6SUN, have been heard with good reports what their signals are like out there. Do come up on 3615 AM on Saturday morn- on the net. Basil ZS6BDS popped in one Om Dave ZS6AAW, listens to the net most ing from around 05:30 and join us. morning to say hello too. Saturday mornings a on a little portable re- We have had a request to take reports on ceiver that has general coverage and then SSB after the AM net on a Saturday morn- gives us a report on the SSB net from his ing. We just could not think why we had not favourite haunt at ZS6MUS from Swartkops thought of this before, but if you listen in on Airbase. the AM net and you don’t have an If you have an AM rig and want to join in the AM transmitter, then feel free to come back fun on AM, please do. Om Garth has proved after the net and give us some reports, when that it doesn’t take a terribly strong AM sig- asked to do so. nal to be heard. Garth runs a QRP rig with We know there are listeners who tune in to only about 10w out. Yes there are times that Collins 200A AM Tx Page 3 AWA Newsletter DUXFORD By Richard ZS6TF My first visit to Duxford near Cambridge was in March 2008.
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