Kempton Rally

Also known as the West London Radio & Electronics Fair and possibly the largest rally now in the UK.  Its terribly easy to get to – follow the M4, the M3 and you are basically there!  So, a quick and easy drive for us…

In attendance are: Waters & Stanton, Radioworld, Moonraker, Icom, Kenwood the RSGB…  Yup, you get the picture is a well attended rally.

It occurs on Sunday April 19th and doors open at 10AM.  If you would like to attend please contact Andrew G0RVM.

Rally website: http://www.radiofairs.co.uk

Antenna Matching by G0RVM

Antenna Matching, G0RVM

Announcement: Change to the TSGARC Programme.

For some time now I’ve had it in mind to give a talk about the importance of matching the antenna to the radio and to identify some common myths.  I’ve dropped this into our programme on Wednesday 25th March just prior to our clubhouse antenna maintenance day on the 28th.

Andrew
G0RVM

Ham College

Whilst browsing the Internet today I discovered a new video series by the AmateurLogic.tv guys.  Its called Ham College and focused at those new to Amateur radio.  Its aimed at the American amateur but, those parts aside, there is some excellent foundation content.

In the first episode they build a basic CW key and sounder then extend it to be a spark gap transmitter.  The second episode is about a crystal receiver.  Definitely worth watching but be prepared to skip around the bits that are not applicable here in the UK.

Andrew
G0RVM

Bletchley Park

Bletchley Park

Bletchley Park

WOW sums up my day at Bletchley Park (BP).  What a place.  I can highly recommend a visit to anyone who has not been.  Well, actually even if you have been!

We arrived just as the doors opened and stayed until they shut and still we felt we could have spent another day or two looking around at the various exhibitions.  Bletchley Park actually consists of several museums.  One is dedicated to WWII codebreaking, Enigma, the Bombe etc another to the National Radio Centre and there is also the National Museum of Computing.

The wartime museum tells the story of Bletchley Park exceedingly well.  Not only where the exhibits excellent but the staff were very knowledgable, keen to talk and to show exhibits working.  How cool was it to see a genuine working three-rotor Enigma 🙂  One of the major creations of BP was the Bombe and to see it working is amazing.  Just its sound and smell are truly memorable.

The National Radio Centre was good and it told the story of radio well. But with the station, GB3RS, I was very disappointed.  In fact I’d say it was the most disappointing element of my day, probably as I had high expectations.  It did not have that welcoming feel and in looking through the door-way I didn’t see much that I felt would draw non radio amateurs in to discover more.  The station was capable of V/UHF and HF operations, however, the V/UHF was unattended and did not appear to be doing much apart from tracking a cube-sat and the HF radio was being used by the RSGB representative initially for Morse then SSB phone.  An area of technology that seemed almost totally unrepresented was data.  This seemed strange as data is the dominant form of communications and is core to the IT and software world that we live in nowadays.  Data modes are great for attracting the inquisitive; its easy to erect some big displays showing waterfall diagrams and real-time contact mapping (e.g. psk reporter, wsprnet), add some computers running ROS, JT65 etc and I’ll bet GB3RS looks more interesting to visitors.

Colossus Bletchley Park

Colossus Bletchley Park

The National Museum of Computing is full of that stuff we all threw out years ago believing it was nothing more than junk. It has the earliest computers, Colossus, through to the latest and everything in between!  I was fascinated, as they seemed to have each pivotal piece of equipment ever made!  It goes without saying that Colossus was amazing, but imagine my surprise to find an early magnetic disk which must have been 4 foot in diameter!  Everything that I’ve grown-up with was there: the Research Machines RM-380z, Sharp MZ80K, Sinclair ZX81, PDP-11, MicroVAX, Commodore PET, VIC-20 and 64.  Dragon 32, IBM PCBBC Micro (In fact they had a whole room of working BBC micros!).  The list goes on and on.  I even found a genuine and working Space Invaders arcade machine.  Now that is COOL!

The afternoon weather was foul.  Cold, wet and windy which made moving between the huts that house the exhibitions unpleasant.  It would be so much nicer in the summer when the weather is more conducive to loitering outside looking at the lovely old house or duck pond.

OK, so you get the message.  I had a great time 🙂

So, thanks to my co-conspiriters for a great day: Paul, JohnL, Andy and David.

Till next time,
Andrew
G0RVM

Bletchley Park Visit

Bletchley Park

Bletchley Park is famous for its wartime codebreaking activities but it also hosts the National Radio Centre.  As visiting radio amateurs we are welcome to spend some time operating this station if its open and if we bring a copy of our Amateur Radio License.  The station has the callsign GB2RS.

The TSGARC will be visiting Bletchley Park on Sunday 22nd February.  Bletchley is near Milton Keynes and about 2.5hrs drive away. The centre is open from 09:30 to 16:00hrs.  People who have been say its well worth a visit and to allow plenty of time to see all its attractions.  The plan, therefore, is to depart at 07:00hrs in the morning as this should get us there for opening time.

The entrance fee is £16.75 for adults unless you are an RSGB member and then its free!  Yes free 🙂 But RSGB members MUST bring with them an admission voucher which they can obtain from the RSGB website.  Login with your account details and then look for a link called ‘Visit Bletchley Park’.  That will take you to a page that allows you to get an admission voucher.  Note that the voucher is only valid for the selected day and named individual.

When the trip was discussed last Wednesday at the club, six people (who know who they are) confirmed that they would be attending.  If you wish to go and have not yet let Andrew know, please do so ASAP so that he can arrange transport.

Andrew
G0RVM

Harwell Radio Rally Visit

The TSGARC visited the Harwell Radio Rally at Didcot today Sunday 8th February 2015.

Members Paul, Rex, Roger, Andy, David, John, Graham and Richard visited the Rally at Didcot and came away with a few bargains and needed items between them.

Unfortunately this rally has been reduced in size this year by one Squash Court however it is still a worthwhile rally at the start of the year.

Plans are to visit the Newbury and Yeovil rallies to this year with other members visiting other rally too.

My thanks go to Andy who drove the second car.

Paul
M0ZMB

When you need a friend…

Steve M6HOB here. I’m relatively new to amateur radio, having obtained my Foundation Licence a year ago and although I attend the Wednesday club nights, I hadn’t got round to buying any radio kit for my station. I have a very old ICOM 2m rig in my Land-Rover, but it’s not much use for general work with pre-selected frequencies only.

I’m currently studying for my Intermediate licence, and building a Walford Electronics “Berrow” QRP CW transceiver as the obligatory project. The club’s tutors Peter (G4OST) and Paul (M0ZMB) have been really helpful guiding me on the build, especially as it’s a fairly advanced project for the intermediate and a radio novice. Construction stalled once I’d completed the receiver side of the kit, as I hadn’t got an aerial up. Cue a friend and club member Andrew (G0RVM) stepping up and spending his Saturday afternoon to help me set up a 1/2 wave dipole on 30 metres / 10 MHz. Despite the bitter cold, we put up a wooden fence post at one end of my garden, and bolted a 3 metre high steel antenna mast from ScrewFix with an eye bolt at the top to run a cord through. The mast is really sturdy and great value, plus you can potentially stack them and go to 4.5 or 6 metres high, though I’m not sure how much tension one could safely put on the aerial wire at that height without guying the top of the mast.

Andrew kindly lent me a 1:1 balun whilst I await delivery of a new one from a well known supplier in Staines. What a nice chap! 🙂

The other end of the dipole is supported on the apex of my garage roof, which puts the centre conveniently close to my study window, keeping the RG58 feeder fairly short. A few minutes work in the loft to run the RG58 up through the wall and out of the soffit vent, and the job was done!

Andrew also brought along his MFJ antenna analyser, so we could tune up the antenna. The wire hangs about 4m off the ground, rather than at least 7.5 metres for a 1/4 wave, partly because to go any higher would put the wire in the midst of a large oak tree and dense branches. We got it resonant but the impedance of the antenna is 25 ohms at resonance in the band centre. Not great, but workable with an ATU, and it seems to receive well across the band, I heard some CW at +20dB on my FRG100.

Anyway, back to the subject line of the post; it’s brilliant to be able to draw on the expertise, kit and friendship of the club members. Someone’s always ready to lend a hand…

73’s
M6HOB

Harwell (Didcot) Radio Rally

We are planning a visit on the 8th February to the Harwell Amateur Radio Rally at Didcot.

The Rally Starts at 10am, the plan therefore is to leave the home address of M0ZMB at approximately 8:30am. Entry to the rally is £3.

Presently I have 8 members signed up to attend. being Me, David, Andy (new) , Rex, Roger, Mike M, John L and Kyle. I’m also looking for one more volunteer driver.

If you wish to attend to let me know and I will add you to the list.

Paul
M0ZMB