Feb - Surrey Radio Contact Club
Contents
1. EC AGM and Construction Contest All Saints Church Parish Rooms Beulah Hill from 7 30pm Bob G3OOU 01737 552170 Meet normally monthly on 1st Friday http www g3oou co uk 10 Feb Coulsdon Amateur Transmitting Society GB3NS by Denis GOOLX Meetings normally held St Swithun s Church Hall Grovelands Rd Purley 8pm 2nd Monday each month Steve Beal G38WZK Secretary catsradio org Tel 01883 620730 20 Feb Sutton amp Cheam RS Fun Cube Satellite Project by David GOMRF Vice Presidents Lounge Sutton United Football Club Gander Green Lane Sutton 8pm Sec John GOBWV 020 8644 9945 18 Feb Bromley amp District ARS Operating Etiquette A Group Discussion What it means and what people do Normal Meetings 7 30 for 8 00 pm Victory Social Club Kechill Gardens Hayes Bromley Kent Contact Andy Brooker G4WGZ 01689 878089 3Feb Noise Cancellation by Graham Somerville M3ZGS of BHI 17 Feb Fix It Move it On Advice Clinic 3 Mar Spring Surplus Equipment Sale 17 Mar Fix It Move it On Advice Clinic 7 Apr SRCC Annual General Meeting 28 Apr Fix It Move it On Advice Clinic 12 May DIY Solar Hot Water with Les Alden G7VML 19 May Fix It Move it On Advice Clinic 2 Jun Understanding the G5RV by Alton Antenna Arrays 16 Jun Fix It Move it On Advice Clinic 7 Jul Club Barbecue at QTH G4CCY G4DDY 21 Jul Fix It Move it On Advi2. GB3NS by Denis Stanton GOOLX Opening remarks by our Chairman Pat McGuinness G4FDN Good evening everyone Happy New Year We have one visitor tonight from Parsons Green Pat then introduced Denis who should be known to most of the twenty seven in the audience this evening from talks at previous meetings and also as a member of the SRCC Before handing over to Denis Pat did remind him of their first QSO via GB3NS on February 20 1977 between 1548 and 1552Z when Denis was operating as G8CUX M while in Ewell Denis the Repeater Keeper began with the history of of GB3NS It came on the air around 1976 77 with an aerial that had circular polarisation as an experiment It worked well in one direction and was tested for nine months Catronics then gave them a J Beam Terry Giles G4CDY built the TX and GB3NS had a very good set up in Banstead where a support group was formed Derek Carrick G7VID built software that would do everything It had to be switched off since the 433MHz output interfered with car security systems ie the cars would not start It was Off for three years until ata CATS meeting Denis decided to get it going again on the original site in Banstead using a continuously running 40W TCVR He was able to keep it there until his Dad died and his Mum got fed up with it It was then moved in December 2011 to the roof of ASDA until June 2012 The repeater was again moved to a temporary location at G4WY J s
3. in the log Moral try harder to get a run frequency from the start next year For masochists of a VHF inclination the 70cm AFS contest is on Sunday March 2 from 0900 1300 UTC At least 2 SRCC members told me at a recent meeting that they intend to be on for this l might even come on myself with my FT847 if can find an 70cm antenna 73 Quin G3BWRR Page 7 of 9 Alvin s Mellotron Project Finished at Last by Alvin G6DTW Although not strictly radio per se thought members would like to see what get up to in my spare time Using six cartridge recorders each having 4 pairs of stereo tracks recorded 48 notes in pairs starting with F and F making an octave of 12 notes including sharps Each pair of notes is on one pair of tracks on a cartridge recorder This took 7 hours for just one pass cello Other pure tones included pan pipes another 7 hours To change voices on the home made mellotron one changes cartridges To go up an octave one changes tracks all six simultaneously Of course track or voice changes can be accommodated within a cartridge but then that lessens the octave range which is 4 octaves Any sound may be recorded One is not limited to musical notes A piece of music can be reproduced of Volkswagens and Fords with differing engine notes Musically there is nothing it cannot do being only limited to one s imagination 73 Alvin Contact at alv
4. it going on with Andrew G4ADM working on a crystal controlled 12V DC to 240V AC inverter and Alvin G6DTW working on an ATU with shorting vanes on one of the variable capacitors Andrew G4ADM Roger G8HDP and Alvin GGDTW Do you want to know the difference between a MFJ 255 antenna analyser and a Sark110 antenna analyser Well suggest you ask John G3ENG as he has both Though both are called antenna analysers the MFJ 255 is really a vector network analyser and so is a more powerful beast altogether being able to measure transfer functions such as filter frequency response and loss through its two port Issue 1 for distribution capability Though that is not to say that the Sark110 is not impressive in its own right If you would like to Know a little more about each links URLs are given below http www mfjenterprises com Product php productid MFJ 225 http sark110 ea4frb eu New Digital Voice Mode for HF FreeDV became aware of this a few months ago via a mention in QST and the latest edition had a short article about it mentioned it to Martin G4FKK on the Top band net that had got set up to listen on this mode and had heard some activity on 20m on 14 236 and within a few hours he had got set up for transmitting and receiving and we had a short QSO with him transmitting on FreeDV on 1 905MHz and me receiving and transmitting back on 433 55MHz FM We were both pleasantly surprised that it worked f
5. manual 1030 FPL fused DC power lead amp ALD 001 3 5mm plug lead 1 2 M long audio lead 1030 UKPA 12V DC mains power adapter LSPKR 20 Watt 4 ohm speaker SPKR8 8 Waitt 8 ohm extension speaker operation Supplied with NEDSP1061 KBD Retrofit DSP pcb module 8 filter levels 9 to 35dB Single button mounting hardware amp full fitting instructions Size only 35mm x 26mm Will fit many transceivers amp receivers Instructions already available for Yaesu FT817 FRG 100 FT 847 FT 897 Icom 706 MKII G Icom 736 738 Kenwood TS50 TS440 Alinco DX Realistic DX 934 amp other radios NEDSP1062 KBD module Amplified DSP Speaker Module Amplified DSP noise cancelling module Fits inside any suitable extension speaker or radio 8 filter levels 9 to 35dB Power on off with bypass 2 5 Watts output Fitting instructions for the Kenwood SP31 amp Yaesu SP8 extension speakers plus will fit inside other speakers like Yaesu SP2000 Supplied with full fitting kit labels and fused DC power T amp lead Accessories for bhi DSP Noise Cancelling Products Extension speakers for use with bhi ANEM MKII or NEIM1031MKII 5 E LSPKR 4 Ohm 20 Watt SPKR8 8 Ohm 8 Watt Mini Switch and connect them Mini Switch Compact two way switch box allows connection of two radios to your bhi noise cancelling product Features 2 x Mono 3 5mm inputs Output to 1 x 3 5mm mono jack socket or 1 x 3 5m
6. noise cancelling base station speaker cleans up noisy voice signals to leave clear speech and works with most transceivers receivers and SDR radios DESKTOP Features include 10 Watts audio Rotary volume and filter level controls Stereo line input Speaker level input headphone socket Audio LED indication of filter function Audio overload Noise reduction 9 to 35dB 12V DC to 18V DC power 2 5A peak Weight 3 6lb dims 8 h x 6 d x 6 3 w mm PSU12 2A 2A 12V DC mains plug in power supply for DESKTOP speaker DTNA Noise Away Base Station DSP extension Speaker Available until stocks are exhausted superseded by DESKTOP DSP speaker Features Basic base station DSP speaker Easy to control via pushbuttons on the front speaker grille Comes with removable mounting bracket a 3 5mm mono 1 2 metre audio plug lead 2 1mm fused DC power lead and user manual weight 1 65Kg Dimensions 200 H x 150 D x 160 W mm Stylish quality matt black speaker Excellent audio quality 4 bass driver and a 1 tweeter unit 2 5 Watt amplified DSP noise cancelling unit Wide audio input level 50 500mW 1030 UKPA 12V DC UK mains adapter ANEM MKII Noise Away Compact inline DSP module Low level audio DSP Amplified Noise Elimination Module Compact in line DSP noise cancelling module Simple push button operation Separate on off and filter select buttons 8 filter levels 9 to 35dB Supplied with user
7. QTH at Tadworth l1091VH where it covered London and North Surrey The final move was to it s present ridge top site just south west of Caterham near Chaldon Page 2 of 9 Common on Willey Park Farm l1O091WG where the antenna could be fixed to the top of a grain silo A fibreglass cabinet was acquired to fit an available space and new equipment was installed The new Motorola DR 3000 is a dual mode analogue and digital device It is rated at 25 to 40w continuous use and is set to give about 13W output after the Band Pass Duplexer and Circulator The RX may have a low noise preamp fitted to help hand held portable use The Logic is an ID O Matic Mk 11 kit which sends a K in morse on carrier drop and is user friendly It is a good site and can reach the outskirts of Brighton and junction 21 on the M25 with 20W ERP on UHF Digital Mobile Radio DMR uses Time Division Multiple Access TDMA which allows two radio transmissions to interleave on one 12 5kKHz wide channel This has the effect of reducing the utilised channel width to 6 25kHz How this is done Take this example two mobiles working through the same DMR repeater have their transmissions sampled in a synchronised manner Some cell phones use the same technique The DMR converts the analogue signal from the microphone to a stream of digital bits which are sent in a 30 msec time slot called a TDMA Burst One slot for each mobile which lasts 60 msec is called the TDMA Fram
8. SURREY RADIO CONTACT CLUB Founded in 1935 FEBRUARY 2014 no 858 CLUB NET 1 905 MHz Sunday 9 30am Hon Sec John Kennedy G3MCX CLUBNET 145 35 MHz 25kHz Friday 9 00pm 22 Croham Park Avenue SOUTH CROYDON Surrey CR2 7HH 020 8688 3322 CLUB Internet WEB Site http www g3src org uk E Mail secretary g3src org uk MONTHLY MEETINGS 15 AND 3 MONDAYS 7 30 FOR 7 45pm Meetings at Trinity School Shirley Park Croydon CR9 7AT kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk 1st MEETING Monday 3 February Noise Cancellation with Graham Somerville M3ZGS 2nd MEETING Monday 17 February Move it On and Fix it Session led by John G8MNY plus discussion on next Club Construction Project SRCC Committee 2013 14 Dear Members amp Friends forecast last month to try it out tend to monitor NS while am busy in the shack so Hello and welcome to the February 2014 issue of will be pleased to talk to anyone via that the Newsletter edited by John G8lYS medium analogue not digital almost added yet but know better All being well shall Editorial Update also be active on the Friday night Club Net on 144 350 MHz This month we will start with some personal amateur radio items rather than subjecting As mentioned recently have also a 70 MHz readers to my home flood experiences Happily Transverter project on the stocks not that it those problems are now almos
9. ation to all who visit the Issue 1 for distribution Museum while helping to preserve and protect the heritage and legacy of this great place More details can be found at http www brooklandsmuseum com index php support us volunteer If you would like to join us or have any questions please contact me by email to peter burton orange net or phone me on 01737 551413 or 07989 557888 AFS 80m RESULTS by Quin G3WRR Just a quick update on the 80m AFS contests in January In the CW event we got on a full team of 4 stations with results as follows GOSAC 190 QSOs G3MCX 87 QSOs G3SRC 246 QSOs G4FYF 46 QSOs TOTAL 569 QSOs Based on last year s score this would have put us about 10 positions higher than last year 26 rather than 36 but given the way conditions vary from year to year such comparisons are distinctly suspect came on in the SSB event again using the G3SRC club call and again from the QTH of Peter Madagan G3RQZ in Godstone thanks Peter but SSB is a very different story from CW the QRM is astonishing with about 300 stations trying to fit into a bandwidth of 125 KHz After spending an hour and twenty minutes tuning around and calling people for 78 QSOs managed to squeeze into a small hole and had a nice run of 109 QSOs in 53 minutes then lost the frequency and was only able to make a further 7 in the following 40 minutes so to my discredit gave up with an hour to go and 192 QSOs
10. bution Page 3 of 9 While thanking Denis for a most interesting presentation the SRCC also made a donation towards the upkeep and running costs of the Repeater This was enhanced by a collection from those present A good evening was had by all All photos above are courtesy of Ray G4FFY Second Meeting Monday 20 January Move it On Fix it and Informal Chat led by John G8BMNY This was a very well attended evening with nineteen present including a visitor from Bulgaria Angel LZ1AHH We also met one of our new Members for the first time Bill M6YCR John G8MNY put a station on the air for testing purposes but we are not sure if he actually worked anything The Chairman s Blog by Pat G4FDN Last meeting on GB3NS know our Hon Sec has provided a detailed write up about this elsewhere in the newsletter but would like to add that the club has quite an active presence on this repeater in both analogue and digital modes know a few more members would be on it too if they could get their Baofeng handhelds programmed with the correct frequencies and sub audible tone and deviation BW setting have got in the habit of monitoring GB3NS when at home and had a nice QSO with Andrew G4ADM M one evening when he was on the M25 on the way back from York Andrew is also active on the repeater s DMR mode At the meeting asked Denis GOOLX to add me to the waiting list for one of the Motorola dual mode handhelds so hope
11. ce Clinic 4 Aug The Crystal Palace Story 1851 1936 18 Aug Fix It Move it On Advice Clinic Message from Bromley amp DARS The B amp DARS are planning to run a Two Day Foundation Course on SATURDAY 16th FEBRUARY and SUNDAY 10th MARCH As you can see this is very soon and if you can pass this to anyone you know who might be interested we will be very grateful Also an Intermediate to follow on SATURDAY 6th APRIL SATURDAY 20th APRIL and SATURDAY 4 MAY Contact See panel Other Clubs Meetings Issue 1 for distribution 14 Feb 28 Feb Wimbledon amp District ARS Antenna Forum with Eric GOKRT VHENFD Then and Now with Jim G4WY J oo ae Jim Noon M6AVV 020 8337 e mail jamesanoon hotmail co uk Web site http www gx3wim org uk Normal meetings are usually at 8pm on the 2nd and final Friday of each month at Martin Way Methodist Church Merton Park corner of Buckleigh Avenue SW19 9JZ 73 John G8IYS Editor SEE also the BHI Flyer Page 9 of 9 bhi DSP Noise Cancelling Products Don t put up with QRM QRN hiss hash white noise etc DSPKR 10 Watt DSP Noise Cancelling Speaker NES10 2 MK3 Features Amplified DSP noise canceling speaker 8 filter levels 9 35dB Rotary filter select control Mono earphone socket 2 W audio 12 24V DC 500mA Filter on off amp Power on off switches Supplied retail boxed with user manual rubber feet fixing screws am
12. d VC10 BAC One Eleven and the only Concorde with public access in South East England It is with this background that we are setting up this display of early radiocommunications equipment They all have an aviation theme and include such iconic items as the 11154 and R1155 We will also have a working amateur radio station as part of the display currently licensed as MOHNS but I ve also applied for GB1BM Because of the Educational ethos of the Museum there will also be a Morse Training Desk and a short wave receiver that the public can play with More details as we build up the display can be found at http www brooklandswireless com The display is being housed in a room within the museum complex and ideally should have a radio minded steward on duty at all times Because the museum is open 7 days a week 51 weeks of the year this requires a sizeable band of volunteer stewards We have already started recruiting but need more people and so am asking if there are any SRCC Members who would like to join us Preferably you can commit to one or more days a week on a regular basis although support for the occasional weekend Special Event will also be welcome Because the Museum is run by a Charitable Trust can t offer you payment for your time or even your travel expenses but can offer you enjoyment and self satisfaction giving time and skill to the Museum is enjoyable and hopefully will give enjoyment and educ
13. e Getting the timing right is absolutely crucial The repeater transmitter keeps running all the time that either mobile is active During the 30 msec time slot the transmitter has to reach full power in 1 5 msec send data for 27 msec and then power down again in 1 5 msec If two slots are in use they can both be voice both data or one of each Analogue only transmissions can only take place using the full 12 5kKHz channel width Digital Smart Technologies for Amateur Radio D STAR uses FDMA Frequency Division Multiple Access and is not compatible with DMR which uses TDMA GB3NS is Analogue and Digital and uses channel DVU54 with operating frequencies repeater input mobile transmit on 430 675MHz repeater output mobile receive on 439 675MHz and CTCSS code D 82 5 Hz GB7NS will be digital only and it is intended to connect it to an aerial on the same mast A new station will be analogue only with 12 5kHz channels To get started a popular DMR portable radio is the Motorola XPR 6550 This comes in both VHF and UHF versions Hand portable rigs are Motorola from Denis for around 75 125 that cover frequencies from 403 480MHz for 7Ocms Denis can be contacted at see GB3NS website or SRCC membership list Denis with mobile in one hand and a circulator in the other A sample of suitable DMRs A DMR base station and link to internet available on e bay or it is possible to buy Issue 1 for distri
14. fully it won t be too long before I m on DMR too For operation at Trinity School Croydon GB3OK on 439 5125 also with 9MHz down shift gives better coverage than GB3NS as it is a lot nearer to Croydon Issue 1 for distribution So maybe we should get in the habit of monitoring that while we are at the second Fix It meetings or on the way to from the meetings Recent club visitors We were pleased to welcome Ryan Sayre M6RSY of Parsons Green near Fulham to our GB3NS meeting Ryan is originally from Portland Oregon and is active on GB3NS and hopes to get going shortly on HF At our second meeting in January we were pleased to welcome Angel Hristov LZ1AHH who is now living locally Angel is interested in contesting and field day operation and plans to take the UK licence exams as way of improving his English which found very good anyway The turnout for the second meeting was very good and we had PSK31 on demonstration courtesy of John G8MNY L to R Alan George John G8MNY Roger GGHDP and Peter G7PWV Bill M6YCR with G3MCX G4XAT and MOLEP in left background Page 4 of 9 At this meeting managed to get a picture above of Bill Jones M6YCR who joined the club in October Bill has done well in getting on the air since getting his licence and has been on the club s Top Band net twice with very good signal strength on the second occasion As usual on second meetings there was a Fix
15. in g6dtw gb cip 32 gbr eu or alvinchallen365 gmail com The finished project Issue 1 for distribution A way of keying for the time necessary for loops PRIVATE SALE by Kim G6JXA KENWOOD TRIO TW4000A 2m 70cm FM XCVR 5 W 25 W 5KHz 25KHz Voice readout No CTCSS Working Low power switch needs cleaning or replacement Switches on mic need cleaning or replacement PTT works OK 30 ICOM PCR1000 PC controlled RX 100KHz 1300MHz AM CW FM LSB USB WEM Filters 2 8kHz 5kHz 6kHz 12 5kHz 25kHz 50KHz 230kHz DSP unit fitted 12VDC operation Controlled by Ham Radio Deluxe software from PC only Should work 50 AOR AR8000 RX 100kHz 1950MHz Tuning steps 5Hz 10Hz 20HZ 50Hz 100HZ 200Hz S00HZ 1kHz 2kHz 5kHz 6kHz 9kHz 10kHz 12 5kKHz 20kHz 25kHz 30kHz 50kHz 100kKHz 250kHz 500kHz Modes AM CW FM LSB USB WFM Auto Memories 1000 12v DC operation or 4 AA Batteries Plug top charger BNC Aerial connector No Aerial 25 Hand held Frequency Counter 3GHz Limit BNC Aerial Connector No Aerial Plug top Charger 10 All items are Buyer to collect by appointment only and pay cash only Contact Kim G6JXA via any of the following g6jxa yahoo co uk Packet Radio PMS G6JXA AT GB7CIO 24hr Answer Phone Text Telephone 07812735507 Home QTH Morden Surrey Page 8 of 9 FUTURE SRCC MEETINGS OTHER CLUBS MEETINGS Date Details 7 Feb Crystal Palace R amp
16. irst time but more work is needed on settings at both ends to maximise the quality This is what it looks like on a waterfall display Fle Tok Hep TA 305 Squelch EET Ds j N i 40 156 2 OTe shw H 3 En Gi Ghai Sto EE i spit aiH 1000H JOH SoH SH Analog i Waara Spectrum Scyiter Fm Aadio fm Hie Tr SpkriHdp wetiddgr The basic info on the mode from http freedv org tiki index php is FreeDV is a GUI application for Windows Linux and MacOS BSD and Android in development that allows any SSB radio to be used for low bit rate digital voice Speech is compressed down to 1600 bit s then modulated onto a 1 25 kHz wide 16QPSK signal which is sent to the Mic input of a SSB radio On receive the signal is received by the SSB radio then demodulated and decoded by FreeDV Communications should be readable down to 2 dB S N and long distance contacts are reported using 1 2 watts power Page 5 of 9 FreeDV was built by an international team of Radio Amateurs working together on coding design user interface and testing FreeDV is open source software released under the GNU Public License version 2 1 The FODMDV modem and Codec 2 Speech codec used in FreeDV are also open source If you have already got going on PSK31 or any other digital mode using a PC or laptop sound card interface you are half way there FreeDV requires in addition a second sound card interface with an analogue headse
17. m mono jack plug lead 3 Watts Maximum Unused input loaded protect audio outputs Velcro pads supplied to enable securing of the Mini Switch to your radio equipment Size Budget noise cancelling headphones Do you use more than one radio with your bhi DSP product Save messing around with cables to one of our switch boxes H2 Proluxe Noise cancelling headphones NCH 1042 Switch Box 1042 Switch Box Connect up to 6 pieces of equipment to your bhi Noise Eliminating Speaker In line Module or Existing Extension Speaker Features 3 Inputs loaded at 8 Ohms 3 Un loaded inputs for low level signals Dimensions L105mm x D75mm x H40mm_ The 1042 switch box is supplied with 2 off 1 2m 3 5mm mono leads To order Tel 01444 870333 or visit our online shop bhi Ltd 22 Woolven Close Burgess Hill RH15 9RR www bhi ltd com Prices include VAT 20 postage and packing not included EA amp O
18. m of 59 95 Euro and thus irresistible Payment via PayPal was easy and delivery was quick Quality is excellent Naturally one has to find a box and a suitable heatsink which is going to be fairly substantial The Vcc required is 50 volts and that is yet another of my started but completion postponed projects 70 MHz 150 Watt Linear Amp and LPF Boards For the really brave the site also offers a 144 MHz Linear Amplifier giving 1 kW output for about 5 W of drive and employs an MRF6VP11KH device it is only 249 95 Euro or 119 95 Euro without the Power MOSFET The site also offers Teflon coaxial cable with characteristic impedances of 25 50 and 75 ohms Just the job for your Wilkinson Combiner or Balun Now onto other items NEXT MONTH S MEETINGS First Meeting Monday 3 February Noise Cancellation with Graham M3ZGS It has been a while since his last visit so we are pleased to welcome back Graham Somerville of Issue 1 for distribution BHI who will present some of his Company s latest DSP Noise Cancellation products For those members receiving this Newsletter by e mail there is a further attachment of the product flyer Those receiving by snail mail will receive a separate printed document Second Meeting Monday 17 February Move it On Fix it Session led led by John G8MNY plus discussion on next Club Construction Project LAST MONTH S MEETINGS by Hon Sec John G3MCX Monday 6 January 2014
19. n hfreadcal pl nosections y amp year 2014 HF and http www rsgbcc org cgi bin readcal pl year 2014 VHF If you are interested and have any queries please do contact Quin by e mail at q g collier btinternet com or myself at g8ivys btinternet com We will be very happy to help with after the event activities such as log preparation and co ordination of their submission Denis Squires G4DAC We were sorry to learn that Denis had suffered an injury to his hip after a fall We are pleased that no fracture was found but scans are planned Denis monitors the Club Nets and hopes to be at a meeting soon 73 Denis Page 6 of 9 Volunteers needed at Brooklands Museum by Peter G3ZPB As some of you may know am leading a small team of enthusiasts putting on a display of some of the many radiocommunications items held by Brooklands Museum near Weybridge Brooklands is the site of the world s first purpose built motor racing circuit and was the birthplace of British motorsport and aviation It is the home of Concorde and the site of many engineering and technological achievements throughout eight decades of the 20th century The Museum displays a wide range of Brooklands related motoring and aviation exhibits ranging from giant racing cars motorcycles and bicycles to an unparalleled collection of Hawker and Vickers BAC built aircraft including the Second World War Wellington Bomber Viking Varsity Viscount Vanguar
20. ount and doesn t really cover posted newsletter costs let alone rent of accommodation at Trinity School So please keep the club fund healthy by supporting this There are usually some great bargains to be had so dont miss it Next Meeting That s all from me this month Hope to see you all on the 3 February to learn about noise cancellation Issue 1 for distribution RSGB AFFILIATED SOCIETIES CONTESTS Reminder Last month Quin G3WRR provided an article on AFS reproduce the event table which he prepared CONTEST DATE TIME MODE 80m AFS CW Sun 12 Jan CW only 1400 1800 UTC 80m AFS SSB Sat 18 Jan SSB only 1400 1800 UTC 432 MHz AFS Sun 2 Feb Mixed 0900 1300 UTC mainly SSB 50 MHz AFS Sun 19 Oct Mixed 0900 1300 UTC mainly SSB Club Calls Sat 8 Nov SSB only 160m 2000 2300 UTC 144 MHz AFS Sun 7 Dec Mixed 1000 1600 UTC mainly SSB The 80m January sessions have now passed see report from Quin later in this Newsletter but in February there is one 432 MHz event It would be good to get at least 4 stations on the air am aware of SRCC activity by Jim G4WYJ and myself John G8lYS plus a maybe from Quin G3WRR hope that other members will also take time to put their 70cm station on the air to support SRCC even if only for a couple of hours The rules are available from the RSGB CC website by clicking on the links from the calendar pages http www rsgbcc org cgi bi
21. p fused DC power lead 1030 VEPL vehicle lead 1030 UKPA 12V DC UK mains adapter Features 10 Watts audio power up to 7 filter levels Simple control of DSP functions Audio input level LED Filter store function Sleep mode Adjustable mounting bracket 10 to 18Vdc operation Auxiliary output socket for headphones or loudspeaker Up to 6 Watts input Separate volume control Dims 135 W x 130 H x 85 D mm PSU12 1A 12V DC plug in mains power supply PSU12 1A EU 12V DC plug in European mains power supply bhi DSP noise cancelling speakers Inline units and internal install modules get rid of noise and interference on all radio bands NEIM1031 MKII Amplified inline DSP Module Features Amplified in line DSP noise cancelling module Use with your extension speaker 8 filter levels 9 to 35dB 3 5mm headphone socket Input level amp volume controls Line level input amp output option 3W audio Requires 12 24V DC 500mA Supplied with fused DC power lead amp 3 5mm mono audio lead amp user manual 1031 108D Horizontal label 1031 stand Perspex mounting stand 1030 UKPA 12V DC mains power adapter Rotary1031 New filter control knob LSPKR 20 Watt 40hm speaker SPKR8 8 Watt 8 ohm extension speaker DSP Noise Cancelling Speaker New DESKTOP 10 Watt DSP Noise Cancelling Base Station Speaker Great Review In Radio User amp RadCom The new bhi 10 watt DESKTOP DSP
22. t sorted and has advanced much since Christmas The 28 70 have been able to spend a few days roller MHz Transverter itself is complete and tin boxed emulsioning the interior of my new shack have and so is the matching Linear amplifier even found time to drop a temporary feeder in hopefully giving 25 watts output all integrated through an opened window permanent lead in within the same enclosure Whenever get the duct yet to be started connecting to my 8 ele 2 chance ponder how to best mount the boxes metre yagi and thence to my 2m 70cm dual within the enclosure and also consider an bander perched on a window sill The antenna economical antenna changeover relay system ie works passably well on 70cm too and have had not an expensive coax relay but ensuring one QSO via GB3NS with Frank G3ZMF just as enough isolation exists between the tx and rx ports and not requiring a 4m 4 x VF coax patch Issue 1 for distribution Page 1 of 9 Also in a relaxed moment undertook a search for circuitry for a further Linear Amplifier to take the Output power up to full UK limit on 70 MHz discovered www dutchrfshop com This is an interesting site and well worth a visit Among several other items it offered a kit comprising double sided plated through boards RF and LPF all passive components including coil winding wire and a Power MOSFET SD2931 10 giving 150 W output for about 2 W of drive This was for the princely su
23. t with mic or a USB headset with mic Please see the above link URL for further information I m happy to test with anyone who wants to have a go Club Newsletter direct to Kindle e reader so far there are just two members taking advantage of this capability but can recommend it to anyone who has a Kindle It is much better than reading on a laptop or PC and saves printing it out It also means you can have all the newsletters in one place If you are interested in trying it let me know and will advise on how it is set up Next club construction project this has been discussed at committee and at the second February meeting we will have an open discussion amongst those interested as to the choice of project We welcome specific ideas but there is the expectation on those proposing that they would be active in leading the project The aim is to kick off construction by the second meeting in May have a couple of ideas of my own but I ll leave details until next time March Surplus Equipment Sale when you read this the sale will be only a month away so am repeating my usual appeal urging all members to support this fund raising event by bringing along equipment or components to sell or donate and also buying some of the items other people have brought along can t stress enough that equipment sales in the club and at Kempton Park are the main source of club income The annual membership subscription is purely a nominal am
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