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September 2010
IN THIS ISSUE
Meeting Program
Club News
Future Meetings & Events
Members News
Technical Snippetts
John Logie Baird
Notice Board - Wanted and For Sale
News from other Clubs
Meeting and Event Diary:
03 Sep 10
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M
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An Evening of Three Mini-Talks by Don Field G3XTT
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07 Nov 10
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R
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West London Radio & Electronics Show
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01 Oct 10
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M
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Repairing Vintage Radios - David Smith M0SXD
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21 Nov 10
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R
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33rd CATS Radio & Electronics Bazaar
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12 Nov 10
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M
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Note revised date. Subject TBA
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03 Dec 10
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M
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Christmas Social
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E = External event, M = club meeting, R = Rally
Recent Event News
6th August 2010 - Summer Barbecue
This meeting was a summer social event and eleven of us sat down to share a buffet supper.
Future Club Meetings and Events
3rd September 2010 - An Evening of Short Talks by Don Field G3XTT
Don Field G3XTT is a well-known DXer, DXpeditioner and contester, who has also written extensively including two RSGB books (Operating Manual and a Guide to 6m) and his regular HF column in RadCom. He is currently a member of the RSGB Board. Don plans to do the following three mini-talks:
 Highlights of the various Five Star DXpeditioners trips to Spratly, Comoros, Rodrigues and St.Brandon
 A brief overview of the 6m band
 Looking back on his trip to Moscow this July, where he was a judge at the World Radio Teamsport Championships
Don will also be prepared to take questions on RSGB matters so take this opportunity and come along.
Please note - the November 2010 meeting has been moved on by one week to 12th November to avoid a clash with Fireworks Night activities.
Foundation Training Course
The club will be running our first course in November with the examination in early December. Successful candidates may then apply to the RSGB for a Foundation amateur radio transmitting licence. If you would like to take part please contact Victor G1PKS for more details and an application form.
Members News
a) Shirley, XYL of silent key member Eddie G4KBY has asked the club to assist in the disposal of Eddie's radio equipment, some of which is listed at the end of this newsletter. The remainder will be listed in the next newsletter. The equipment is in good condition cosmetically but has not been tested.
b) Earlier this year we had an increase in the meeting room rent and a further review is proposed in January 2011 although that amount has yet to be decided. It is therefore proposed to increase the meeting attendance fee from the £1 amount which has been in place for many years to £2.00 to cover these increased costs.
Technical Snippets
a) Six meters has produced some interesting openings during the daytime with 9H1 heard and IT9 worked, both on SSB with S9 signals. Few stations were heard on CW.
Your scribe has had some success in the design and construction of valve circuits for his SB-101 rebuild project. The 6AR8 based self oscillating (crystal controlled) balanced modulator is now working correctly and producing in excess of 40dB carrier suppression and a low level amplitude modulator using the heptode section of an ECH81 produces up to 90% modulation depth before significant distortion occurs. Both circuits work at 3.395MHz. The triode section of the ECH81 will be used as a unity gain phase inverter so that push-pull audio signals are available to drive the balanced modulator.
Miscellaneous
Steve G3WZK from CATS writes: As a footnote to the Woodside Brickworks saga (CPREC July 2010 talk - Ed), I did an evening class in geology once and remember being told that, towards the end, the brickworks received a temporary reprieve from closure. At the time, the Victoria tube line tunnels were being dug and producing a lot of valuable clay, so it was decided to keep the works open a little longer so that all the spoil from the excavations could be put to good use. As soon as the tunnels had been dug, the works closed.
Wimbledon & District ARS - Annual Camp
This event takes place each year although this is the first time that I have visited the site. I spoke to Kim on GX3WIM immediately after our Wednesday net finished and he invited me to visit later that week. The site is located in a large farm field about one mile to the east of Junction 8 on the M25.
When I arrived at around midday, most people were still recovering from a very late session the previous evening. There were three station tents powered from a number of generators ranging from 500W to 6KW. The first two photos show an HF and VHF station provided by John G8MNY and the associated aerial system.
The station consists of an Icom IC730 transceiver and a Drake 400W linear for the HF bands and an FT690 driving a 50W solid state linear in turn driving a 4CX250B linear generating in excess of 200W output on 50MHz. The FT690 was throttled back to around 100mW output power.
The beam on the left is a five element vertically polarised yagi for 144MHz. The other two horizontal beams are a five element yagi for 6m and a TA33jr three band yagi covering 10-15-20m. While I was there an HA6 in Hungary was raised on 50MHz SSB at 5&9 both ways.
Radio Station:
Aerials:
Another tent housed a 2m station with a 15 element beam pointing North - the Angus beacon was coming in loud and clear.
Air Day 2010 at RAF Kenley
Your scribe and his XYL Cathy visited this event on 14th August 2010 hoping to see a Lancaster and other WWII aircraft in a fly-past. Unfortunately the weather took a turn for the worse and with the cloud cover as low as 600 feet the fly-past was called off.
However, all of the other programme events took place including an impressive display of radio controlled aircraft with one simulating an on- board fire with lots of smoke and some very clever aerobatics. A number of vintage aircraft including a Hurricane and a more recently built Pitt Special biplane flew into the event and were on display to visitors.
The event also included a demonstration of old steam, petrol and diesel engines
and a collection of MG cars including this one with a picnic hamper on the back:
Notice Board - Wanted and For Sale
The Notice Board is for all club members to use so if you have one or more items that you wish to buy or sell then please send in the details. The current list of items may be viewed at: http://www.g3oou.co.uk/ in the "Notice Board - Wanted and For Sale" section.
Wanted:
SWL club member looking for a VHF multimode receiver covering at least 144-146MHz. Contact Victor on 020 8653 2946 or Bob on 01737 552170.
For Sale:
Ken G3DJK has a PCI Firewire Card 1349A, Maplin Code A49HH (new and unused). Best offer secures. Contact Ken on 020 8679 2717
Sycom run by Robin G3NFV supplies a range of electronic components & new/second hand equipment. The web site can be found at: http://www.sycomcomp.co.uk/
JAB Electronic Components, PO Box 5774, Birmingham, B44 8PJ supply a wide range of electronic components and can be contacted on 0121-682-7045 or by email at: jabdog@blueyonder.co.uk
73
 G3OOU
Diary of External Events
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11-12 Sep - Gatwick Radio Weekend
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Annual FAMILY RADIO WEEKEND very close to Gatwick on the A217 at Hunters Moon Location; RH6 0HU, GRID TQ 262438.
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1 -2 Oct - National Hamfest
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Bought to you by the RSGB in association with the Lincoln Short Wave Club. George Stephenson Pavilion, Newark and Nottinghamshire Showground, Lincoln Road, Winthorpe, Newark NG24 2NY (close to junction of A1/A46/A17). Morse tests on demand, RSGB Bookstall, RSGB Services & Committees.
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8-10 Oct - RSGB Convention
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Horwood House, near Milton Keynes. The RSGB is pleased to announce that the online shop is now taking bookings for the 2010 Convention. Features include:
Dxpedition Lectures, International Lectures
Major Technical Lectures, All Bands, DXCC Card Checking, Demonstration Stations
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7 Nov - West London Radio & Electronics Show
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Kempton Park racecourse, Staines Road East, Sunbury on Thames, Middlesex TW16 5AQ. Opens 10.00, RSGB, Talk-in S22 (V44). Paul, M0CJX, 0845 165 0351 0845 165 0351, info@radiofairs.co.uk
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21 Nov - 33rd CATS Radio & Electronics Bazaar
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1st Coulsdon Scout HQ, r/o Council Car Park, Lion Green Road, Coulsdon, Surrey. Open 10.00-13.00, Entry £1. Details Andy, G8JAC,
e-mail: secretary@catsradio.org.
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News from other Clubs
Club Secretaries - please send your meeting programs to Bob G3OOU. Our newsletter is now published during the third week of each month and closes for editorial input at the end of the second week. Due to differing publication dates and short lead times it is sometimes difficult to include other clubs' specific events although we will endeavour to do so if advised in time.
Chelmsford Amateur Rado Society (CARS)
Secretary Martyn Medcalf G1EFL Tel: 01245-469008. First Tuesday of each month at MASC, Beehive Lane, Great Baddow, Chelmsford, CM2 9RX. Essex. UK. Web: www.g0mwt.org.uk
07 Sep
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WWII Arnhem Operation Radio Failure" By Peter Best G8BLS.
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26 Sep
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Science & Discovery Day at Sandford Mill, 10am to 5pm - Free.
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Coulsdon (CATS) 2nd Monday every month, 8pm at St Swithun's Church Hall, Grovelands Road, Purley. Contact: Andy Jackson G8JAC, 020 8651 2727, G8JAC@btinternet.com
13 Sep
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Talk on Green Energy by Glenn, G4FVL
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11 Oct
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Talk on WSPR by Walter Blanchard, G3JKV
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Echelford Amateur Radio Society
Meets on 2nd and 4th Thursday of each month.
Phone for details.
Mitcham & District Amateur Radio Society
Secretary: Mike Knott G0WCR, 76 New Barnes Avenue, Mitcham, Surrey, CR4 1LF.
Tel: 020 8764 4716
Phone for details
Reigate Amateur Transmitting Society
Secretary: Tim Trew G8JXV
Meeting on 3rd Thursday of each month, 7:30pm at RNIB Redhill College, Philanthrophic Road, Redhill
Surrey Radio Contact Club (SRCC) 1st and 3rd Monday every month, 8pm at Trinity School, South Croydon. Contact: Ray Howells G4FFY on 020 8644 7589 or secretary@g3src.org.uk for more details.
06 Sep
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TBA
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04 Oct
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Autumn Surplus Equipment Sale
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Sutton & Cheam RS. 3rd Thursday every month, 8pm at Sutton United FC, The Borough Sports Ground, Gander Green Lane, Sutton. Contact John Puttock G0BWV on 020 8644 9945
16 Sep
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`Radio Fox Hunts' by Terry Giles G4CDY
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21 Oct
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'Coping With Weak Signals On HF' by Stan Rudcenko - GØKBL
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18 Nov
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'Building and Using the TenTec 1330' by Martin Butler - M1MRB
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09 Dec
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Christmas Junk Sale (2nd Thursday this month only)
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Wimbledon. 2nd and last Friday every month, 8pm at Martin Way Methodist Church, Buckleigh Avenue, Merton Park, SW19 9JZ
Contact Jim Bell, M0CON on 020 8874 7456
24 Sep
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Radio Susy - John Stockley
G8MNY
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29 Oct
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Annual General Meeting
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26 Nov
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Surplus Equipment Sale
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Sensible bids are invited for the following equipment from the shack of silent key G4KBY (more to follow):
Description
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Price
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Description
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Price
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KW EZ Match 3.5 - 30MHz (two)
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£40 each
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KW103 HF bands SWR meter
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£25
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KW1000 HF bands linear
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£250
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Pye Westminster 144MHz with fist microphone
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£20
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Kenwood TS130S HF bands (3.5 - 30MHz including WARC bands) transceiver - requires 13.5V DC supply
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£150
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Kenwood VFO120 remote VFO in original packing box (for use with TS130S)
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£40
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Trio TS820 HF bands mains transceiver (1.8-30MHz but no WARC)
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£150
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TS820 Remote VFO in original packing box
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£40
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Trio SP820 loudspeaker and audio filter unit
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£25
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Trio R600 short wave receiver (faulty)
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£25
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Kenwood PS30 mains to DC power supply unit, 13.5V 15-20A
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£30
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Shure 444 desk microphone
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£25
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Datong Auto-notch audio filter
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£20
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Datong Morse tutor
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£20
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