All posts by John Gumb

“ACE HIGH” Tropo Scatter system

While researching for club talks, I ran across the following link regarding the tropo scatter system used in the 1970s/1980s with eye watering ERPs. A few members will know about this system, however many new to the club may not:

https://www.subbrit.org.uk/features/ace-high-nato-communications-system

Like Graham, G3XYX I have visited the Stenigot site in Lincolnshire wolds (in itself an incredibly beautiful place) – sadly only one dish remains now. Possible club talk if anyone knows a speaker…?

meeting 14th February – TELL US WHAT YOU’RE UP TO!

14th Feb Woodford Park meeting is a chance for us to catch up on the
various projects/activities we’re up to – in particular any follow ups
to the Great Construction Contest but not limited to that.

If you’d like a short (5 minute or so) slot let me know.

Doesn’t have to be stuff – could be contest updates or how RADARC
contributes comms to events like 3 towers etc.

Also – what would you like to see and I’ll try and arrange?

We can take contributions on the fly on the evening if need be.

  • Min G0JMS will kindly bring along a RigExpert HF to VHF SWR meter (Digital display) RigExpert to show you and VHF to UHF swr power meter (Cheap unit) which includes frequency. He will also do a brief demo of Yaesu Fusion – Wires X technology RF paths permitting.

If necessary, I’ll bore you for a few minutes before the bottles and
tomatoes start flying:

  • Geostationary satellite project – es hail 2. Mike G4CDF (and possibly others???) is making the running on this one but I will present on his behalf a very short overview. iirc it’s 2.4GHz up and 10GHz down. tx/rx is based on an SDR transceiver (lime sdr mini).
  • Adventures with FT8 internals and taxi radios (generating FT8 tones by pulling a carrier around) – update. TBH anything that generates a stable carrier and can be pulled a bit maybe down to 1Hz resolution looks like it might work – eg. voltage controlled oscillator.
  • cheap RTL-SDR dongles (£15 delivered). Mine does work but probably better to get the real ones rather than fakes like mine.
  • short gnuradio demo (maybe)

We’ll have the ICOM IC7300 out for people to have a play with and the spectrum analyser.

Tea, coffee and biscuits will be in plentiful supply all evening.

Looking forward to hearing from you.

73

John

G4RDC

Stephen Coleman G4YFB, SK

Steve G4YFB


It is with a tremendous amount of regret that I have to let you know that club member Stephen Coleman, G4YFB, passed away on Friday 4th January aged 66.

He had been battling cancer having been diagnosed only 9 weeks ago.

Steve was a supporter of the Club and recently had been helping Ray with the Intermediate and Foundation courses. Going back to the 80s, he taught the RAE course.

Also, he was a member of the Thames Valley Repeater Group (TVRG) and had used his software talents to provide modern programming software for old PMR radios we had for sale. Those of you that were into packet radio may remember that for a period most of the U.K. mailboxes used the YFB software.

A man of hidden talents who will be very much missed.

” It is very sad to learn of this news. Steve always had a lot of time for anyone. I know he dedicated a lot of time to writing the programming software for the VX-10 before TVRG set about selling them a couple of years ago. He will be missed. ” – Jonathan M0JSX / K6JSX

“Steve gave a talk to the Farnborough and District Radio Society In 2016 and always greeted me when he saw me at rallies. RIP Steve gone too early.” – Phil G1LKJ

“Sorry to hear the sad news about Steve, much to young.” – Min G0JMS

“I am very sad to have lost an old friend and enthusiastic supporter of everything. His dry sense of humour and ‘can do’ attitude was always an inspiration. He will be a great loss to the club and the wider Amateur community.” – Baz G8DOR

“I knew Steve initially through the talk on the Development of Radar and Virtual Radar he kindly did for the club in May 2017. From that it was clear he was a prodigious software talent developing his own ADS-B decoding software. He was very thorough in the prep he did for the talk bringing along examples of kit and demonstrating them. He made it look easy. Anyone that’s ever tried to demonstrate stuff will know, it’s really not.

He was completely self-taught in software. With the hard stuff he was tackling and the results he got, that’s quite remarkable. I was hoping to learn more of the magical things he was doing with TVRG particularly in the area of software for commercial PMR sets.

Someone with Steve’s talent, experience and kind unassuming nature getting involved with training was always going to be a perfect match. I will very much miss him” – John G4RD

The funeral be held at the English Martyrs Church, 67 Liebenrood Road, Reading, RG30 2EB, Berkshire at 13.30 on Tuesday January 29th. This will be followed by a burial at Caversham Cemetery, All Hallows Road, RG4 5LP at approximately 15.00. A “reception” will then follow at the Travellers Rest Public House, 180 Henley Road, Caversham, Reading, RG4 5DL, at around 15.45 onwards.

Dress code is informal – what you feel happy with.

If you wish to send flowers, then these can be ordered via the A.B. Walker website www.abwalker.co.uk Alternatively donations can be made to the Sue Ryder charity, again via the A.B. Walker website, although at the time of writing this hadn’t been set up.

Chris G4CCC and John G4RDC

Memories of Peter, G4JNU

Peter G4JNU talking about his valve display 2017.
Peter in full flow at a RADARC meeting 2017 with his valve display.
Peter G4JNU at the McMichael Rally in 2008
McMichael Rally 2008
Peter G4JNU at RADARC's 70th.
Ever the creator, a demonstration for RADARC’s 70th year (2004). Some beautifully made equipment and some work in progress? Maybe someone can remember.
Peter's celebration of RADARC history at Reading Rugby Football club, 2014.
Peter’s consummately professional display celebrating our club’s history at RADARC’s 80th event (2014), Reading Rugby Football Club, Sonning.
Construction Contest 2013 - Peter presenting first prize to Jim G0LHZ
Construction Contest 2013 – Peter presenting first prize to Jim G0LHZ
Construction Contest 2014 - Peter presenting second prize to John G4RDC
Construction Contest 2014 – Peter presenting second prize to John G4RDC
RADARC AGM 2008
RADARC AGM 2008
Knowl Hill Steam Rally, early 1980s.
Knowl Hill Steam Rally, early 1980s. I can identify Peter, I think. Not sure who the supporting cast are! Health and Safety? Well it was the 80s….

Page to be updated as we get more photos and memories. If you have more to add or further information for the stories above, please use the contact forms via the Contact page.

meeting 10th Jan – Equipment + Alignment evening, Spectrum analyser Intro

Folks,

Happy RADARC New Year to you!

Next meeting is Thursday 10th January, Woodford Park, Woodley.

Eyes down 8pm.

This time it’s the club equipment that’s the star of the show with the new Rigol spectrum analyser and the Icom IC7300 transceiver “Top of the Bill”. However Ray G3SCZ will also give a short introduction to the spectrum analyser and what it’s capable of. Many thanks to Ray for that.

It will be less formal than ‘normal’ talk evenings. This is more a chance for you to play with stuff – and have a natter, of course.

Also note the “humble support acts” are very capable (antenna analysers etc.). If you haven’t used one and you enjoy messing with antennas do come along.

This is a great opportunity to see how test equipment can make your life much easier and what radio equipment we have that’s ready to use.

Bring along any filters you may need aligned, also attenuators and dummy loads to find out what they’re really doing, and antennas within reason. Alignment evenings reborn!

On show will be:

  • Icom IC7300 transceiver
  • Rigol Spectrum Analyser + tracking generator + VSWR attachment
  • MFJ259 + MFJ269 Antenna Analysers
  • FT100D HF Rig
  • Marconi radio test set (combination of sig gen + spec analyser iirc
    donated by Mick G8ZWN. Need to get to know this better.)
  • FL2100Z linear – even if we just admire the glassware on it. Needs bringing up on a variac.
  • FT757GT transceiver
  • Advantest 1GHz spectrum analyser

+more, will keep you updated.

This will also be a good opportunity to discuss what our next equipment purchase should be. One obvious thing I’d say is missing is a decent, modern (i.e. small, light, capable) RF signal generator. Others:

  • 10MHz GPS locked frequency source
  • Decent Frequency counter i.e. accurate and wide range.

Would be good to chat about what makes sense to purchase as a club and what not.

Tea, coffee, biscuits will be in plentiful supply – perhaps a bit
earlier than usual. But only for humans/our membership. A valve linear at full throttle drinking a cup of tea doesn’t bear thinking about! As ever, keep your meetings ideas coming. If you mentioned something to me before and I’ve not done anything about it, please nag me.

Season’s greetings all,

73

John
G4RDC

(Hopefully you can read this. I’m battling the new ‘wordpress’ interface as you may be able to tell.)

New 4 metre web SDR IN South herts.

John G3VHH notes we have a new 4 metre web SDR available to us covering 69.492 – 71.028 MHz

http://81.111.70.181:8091

IP address may change so look at http://websdr.org/ for a definitive address. Text is “4 Meter WebSDR Located in south Hartfordshire UK using a RTL Dongle”. Antenna is a 4 metre quarter wave ground plane.

Many thanks to John and Steven M0XVT for making this available.

73

John G4RDC

Peter G4JNU, SK

With a very heavy heart, I must report that Peter G4JNU died peacefully on Sunday 23rd December.

Peter was held in the highest regard by everyone who knew him. Here are just a few of the tributes:

“As usual I had an amazing demo of a magnificent piece of early 30 line TV equipment he had been working on” – Vin, G4JTR

“Terribly sorry to hear about Peter” – Sean, 2E0ZIP

“Very sorry to hear the passing of Pete, we will miss him” – Michael M0MPM

“I also have very fond memories of Peter, G4JNU. He will be remembered for his re-creation of Baird’s mechanical scanning TV system and the transmission by amateur radio to the USA of these images from the Amberley Museum. He has always been a great experimenter and home constructor.” – Harry G3NGX

“What a shock. Such a nice man and regularly saw his car (registration G4JNU of course) parked here in the village, visiting family or out walking.” – Don G3XTT

“What a huge shame. Peter was a stalwart of the club for as long as I can remember. A true gentleman and a real engineer of a kind you so rarely meet. He will be greatly missed.” – Baz G8DOR

“I mourn the passing of a gentleman in every sense of the word. Peter had so much to teach us all. ” – Ray G3SCZ

“Truly a gentleman in every sense and an inspiration to me and many, many more.” – Dave M0PMZ

“I am truly devasted by this news. Pete was a rock at RADARC and had energy and helpfulness which few could match. RIP Peter, I shall miss you.” – Robin G4IWS

“Peter was a master engineer and always ready to lend a helping hand where needed. The equipment he built and demonstrated were an inspiration to us all. A loss to RADARC. RIP Peter.” – Jim G0LHZ

“He was normally an early starter at the rally helping out where ever he could always with a smile and then going on to the club table. At meeting he would busy himself with getting the room ready before chatting to all. I was astonished by his knowledge on mechanical TV and was able to help him with a presentation he was doing. He gave more than he took.” – Min G0JMS

“A very sad loss. I have many fond memories of Peter over the many years that I have known him. A great enthusiast for all thigs radio and mentor to newer members of RADARC. RIP Peter” – Andy M5ALG

“I never heard Peter complain or judge any one, he always came to the Club Meetings with warmth and a smile. Following on from Min’s comments may I add the tables for the sound and projector were always in place in ample time for the AV. set up . He braved the pull up/fall down finger crushing screen on many occasions! Peter was a regular for NFD set up and tear down and the McMichael junk sale tables , in mature years struggling valiantly with heavy boxes and boat anchors. In memory of a true gentleman. Sadly missed” – Graham G3XYX.

“I always remember the first time I entered a construction contest and thought I was in with a chance with my MSF clock… only to have Peter lift a large box off of his built-from-scratch replica of a Baird televisor which immediately dashed everybody else’s chances. His knowledge of original TV systems led to him making things for a BBC programme a few years ago if I recall correctly. Rest in Peace Peter. You will be sadly missed.” – Des, G8FIF

“A sad loss to the club and to amateur radio. Peter had a great depth of knowledge and experience, he was always willing to listen to the other persons point of view and was greatly respected by all.” – Dave G4BOO

I will close by noting Peter was awarded the Bingham Shield at the RADARC AGM for his tireless support for the club and in particular for sorting through and testing hundreds of valves which raised a considerable sum at the McMichael Rally. Most recently he gave a beautiful demonstration of his ‘Marconi Detector’ at Dr. Elizabeth Bruton’s talk in October.

He was thrilled to bits with the award – particularly as it had his name on it. Peter – it’s yours for that and so, so much more.

I consider it a privilege to have known Peter. Brilliant engineer, gentle soul.

The funeral service will be at St Andrews Church, Caversham Heights, on Friday 11th January at 2 pm followed by a wake at a local venue to be decided.

See https://www.standrewscaversham.org/ for details on St Andrews.

73

John G4RDC