Small Job develops into a Marathon.

It has been a bit rough the last few weeks with periods of high winds, which necessitated the luffing of the Tenna Mast in the back garden. In fact I dropped it over in a bit of a rush one dark night and in the process forgot to slacken off the feeder at the same time as taking the tension off the halyard for the wire antenna, the centre of which is hung from the tower. In the process of dropping the mast, I ripped the feeder out of the plug in the balun!

The Tennamast with The MA5b, the Alpha Delta DX/CC wire antenna, 70cm 4 dipole array and Weather Station!

Today I had an hour to spare and thought I would put a new plug on the feeder and seal it up with some self amalgamating tape. Following the work on the feeder, I performed a quick test for impedance and SWR on a dummy load before putting the mast up again. At the same time, I replaced batteries in the weather station which has been down for a couple of months, but as I went to put everything back, I noticed that the 300 Ohm feeder for the 1/2 size G5RV had become disconnected from the RG58/twin feed adaptor (I use this for a listening antenna for a noise canceller). Upon closer inspection corrosion was responsible for the parting of the ways of the twin feeder from the crimped eye connections in the adaptor. Another repair later, plus re-positioning the beam on the stub mast (it had twisted out of alignment in the wind), and the antenna farm was back in business.

What was going to be a quick plug replacement ended up being nearly 2 hours worth of faffing around, but at least everything is up and running again now.

1st official visit as District Rep 123

21st January was my first meeting as a District Representative of the RSGB.

Regional Rep for Region 12 Peter Onion also attended Bishops Stortford Amateur Radio Society (BSARS) to introduce me to the club.

It was a pleasant evening meeting the club members and exchanging news and views.

Coming up over the next couple of months, introductions at Thurrock Acorns, Harlow and Havering, plus an official visit to Lefars (my own club, but wearing a different shirt!)

So begins what looks to be shaping up for a busy year. With some clubs receiving all too infrequent visits in the past, I am aiming to visit all the clubs on my patch at least three times this year. I am looking forward to representing the clubs and working with the RSGB for all the radio amateurs on my patch.

Appointment by RSGB as a Regional Representative

I am pleased to announce that I am now officially District Rep for the RSGB in District 12 Region 123.

The roll will include travelling to various clubs in the district, supporting Regional Rep Peter Onion in representing the RSGB and acting as a conduit between Clubs, Members and the RSGB.

I very much look forward to engaging with and representing RSGB members, Clubs and Radio Amatuers in the UK and Internationally, and the challenge of helping move the interest of the hobby forward in the future.

If anyone wishes their views to be forwarded to the RSGB, then I am your man, If you need help with EMC or planning issues, we can help.I can be contacted by my details which are listed on the RSGB website under the info for the Region 12 team at http://www.rsgb.org.uk/ 

 

GB2RS surprises

Some of you may know that I am a news reader for GB2RS, ‘The News Broadcasting Sevice of the RSGB’.

Most weeks it is a case of downloading the script on Saturday night, editing it for the local region and entering it ionto the autocue software I use for the next mornings reading. Then in the morning run downstairs into the shack, power up the radios, and key up on 145.525 and 433.525 Mhz at 09:00 to provide a simulcast for GB2RS.

Because the 2m frequency is used by the news reader from Ipswich at 09:30, I QSY to the local club frequency 144.725 Mhz to take signal reports.. and this weekend, I was suprised to hear ON3POJ pop up and say hi from Belgium!

This is not the first time either. I recently submitted a news story to RADCOM, the RSGB members magazine about unusual contacts I have had during the Signal Reports:

“Some amateurs go to great legnths to listen to GB2RS News but on the 11 March Hainault News reader Dave, M0MBD got a post-broadcast reception report from Steve M5BXB via his remote stationn in the Canary Islands.Steve often listens to GB2RS from home and gives reports, but this time he was using his phone to remote into his shack. Dave is used to DX reception  of his 2m & 70cm broadcasts, often ghetting reports from French stations and last December Johan, ON3POJ popped up with a report from Belgium.”

I would have loved to have scanned a copy of the news item and posted it here, but sadly copyright considerations prevent me from doing so.

I would like to take this opportunity to thank all the stations that call in with ‘Sig Reps’ (whichever Country you call from!) as it really make the news reading worthwhile. There is nothing worse than spending all the time prepping and being chained to the mic every Sunday morning if you are not sure if anyone is listening, or, worse still, no one is listening!

CT7/M0MBD/M

It has been a while since I have made an entry on the blog, so here it is:

 

CT7/M0MBD/P

This spring we decided to go on a short cruise. Because I have just taken over another company, I could not afford to be away for too long, so we booked a cruise from Southampton to Portugal. It would take in Vigo (Spain), Lisbon, Porto and Cherbourg and have two ‘sea days’.

As the cruise was so short, I was not going through all the rigmarole of getting the HF radio on the shop like I did for the Caribbean  on the Ventura, as I did not plan on operating on the ship.

I just packed the trusty MD380 and also a selection of codeplugs that I had on my laptop. It was all very last minute and I had not researched any of the repeaters that might be in range at any of the destinations, this would however not stop me from having a bit of fun!

Arriving at Vigo (feeling a bit woozy after the P&O Azura crashed through 6m swells in the Bay of Biscay), I tried every channel I had on the radio & could not connect with anything, so left the radio on the ship. All was not lost though as Vigo was celebrating the expulsion of Napoleons armies from the city in 1809. much fine local food, drink and music was on offer int he old town, as the locals came out to play (while the rest of the shops were all closed!).

I was back on the ship for our next stop, Lisbon, where the CT codeplug I brought with was duly loaded on the MD380. This was a much more successful affair with a number of repeaters opening up when interrogated. During a lull in the sightseeing I took advantage of a quiet moment to shatter the peace and tranquility with some CQ calls on the Worldwide Channel (See Photo above), using the call CT7/M0MBD/P. First response was a chap in Maine USA! Our taxi driver was mightily impressed with the American drawl emanating from my tiny radio and asked if the other station was really in America! Whilst the rest of the family took photo’s of a fine aqueduct (and me) I was deep in conversation relaying weather conditions and a description of the visa to my new buddy in Maine. The problem was I did not have a pen and paper to record the callsign and personal details of my American contact, but you will have to just trust me that I was not talking to myself in the photo!

Back to the ship and it was all on deck for the leaving party. I cheekily went up on the sun deck out of the way and had pit out a quick call as CT7/M0MBD/MM and was inundated with calls, once again from America. I worked about 4 stations as we steamed under the 25 De Abril Bridge (formally know as Ponte Salazar), with contacts on both the East and West coasts of the USA, including some chap in Yellowstone Park! One remarked that they could hear the wind, which was indeed getting up as we approached the mouth of the river Tigus and back into the North Atlantic Sea, so I beat a hasty retreat downstairs and got ready for dinner.

The visit to Oporto was uneventful radio wise as the codeplug did not feature any repeaters that were in range at this location, so the radio stayed n the ship and I concentrated on more important mattes, like visiting the wine cellar of my favourite Port manufacturer, Taylors! The weather was also highly changeable and we gave up walking around the centre of Oporto when we got drenched in a downpour!

A day at sea ensued where we were once again battered by ship ploughing through swells of 6m again at a speed of over 20 Knots! The jarring of the bow coming down into waves was so fierce that equipment from the roof over the main stage parted company with it’s fitting, crashed to the stage and bounced into someone, causing some of the shows to be cancelled for safety reasons. It also made for a weird experience trying to sleep at night as your body weight appeared to fluctuated +/- a few Stone with the rise and fall of the ship. Our location of our stateroom, near the bow of the ship did not help matters.

The last stop of the cruise in Cherbourg was more of shopping trip with our party stocking up on French bread and cheese! I got called back to the ship on business and had to attend to some work online, but managed to get off the ship again in the afternoon to have a look around the Nuclear Submarine ‘Le Redoubtable’ which is open to the public as part of a Maritime exhibition next to the cruise terminal. This was a fascinating look inside a ballistic missile carrying sub, which is the largest submarine open to the public in the world. What was impressive was how they managed to cut out the whole nuclear reactor section of the sub and replace it with a shell which, once you went past the engineering control room, made it appear you have entered a totally empty part of the cylinder!  Interestingly, from the sea (on the ship as we left port), you can still see the actual nuclear reactor portion of the sub which is being decommissioned in the naval dockyard! There was absolutely no playing radio on this part of the cruise as I could not find a suitable codeplug for France and I could not find anything that made any sense about DMR in France while surfing online!

So That was this years ‘Radio on Holiday’ so far! Just a few short contacts from Portugal on DMR, but even then it a too many for my family. It is perhaps just as well I did not take the HF station with me on this trip then!

12m Mast Update

Following my extreme disappointment at losing my 12m mast through an ‘agricultural incident’, I have been heartened by a number of people rallying round to help.

Initially George M1GEO and his dad Chris G8OCV tried to repair the mast by cutting off the broken section and rebuilding it, but sadly with a bit of a bend on the remaining damaged section, it would not retract fully and would be impossible to transport.

However LEFARS club Chairman Dick G4DDP had a mast surplus to requirements which he ‘donated’ to me,  I ended up with a replacement mast, while George kept my ‘compromised’ one! Christmas came a few weeks early for me this year!

I have some minor work to do in order to use it, as I had modified my old mast for use with a Clark guy rope kit, as the lower eyelet on the mast were damaged. This replacement mast has the same issue, but a while ago, I bought a replacement bottom section with intact eyelets, so as soon as the weather warms up i will replace that section and I should have a 100% usable Racal 12m PU mast again, this time using the original Racal guy ropes.

My sincere gratitude goes out to Dick for helping me recover what was an irreplaceable part of my portable setup. I certainly could not afford to buy a replacement mast due to my current financial circumstances!

Sick Icom IC746 repaired

I have been dreading it.. I have put it off for ages, Yes the 746 has been fixed.

A few months ago, I had been using the radio (my main HF rig) and it started making funny noises when the internal tuner tried to match the aerial. It also would not match.

I looked up on the internet for possible issue and solution and discovered that the radio had a known issue with the tuners motors, where a sonic weld fails between the ferrite core and a spindle and washer. The thing is I had a workaround which was to use an external manual ATU, so knowing just how many screws I would have to remove just to get to the motor, the job got put off for some time.

I finally bit the bullet because of the way I operate. With band conditions quite lacklustre at the moment, I frequently band hop, which necessitates frequent re-matching of the aerials. It was becoming a real drag keying up and manually tuning all the time, so I though “damn it, lets get this done’. First thing was to get the video I found about this repair up on my iPad. ( https://www.youtube.com/watch?v=UdY6RhNOCWg ) and then it was a matter of removing over 30 screws and de-soldering the aerial sockets from the board before I could get to the motor and fix it.

The dreaded stepper motor, note the crimped ends which needed prying out.

The motor was extremely difficult to get apart without either damaging it or impaling my hand on a screwdriver, but eventually I got into it and glued the bits together, reassembled it all and hey presto a few hours after I started the 746 is back in action and working perfectly.

I think my new years resolution is to get things done and not let things build up. You never seem to have enough enthusiasm to fix something when you know what a ball-ache it is going to be to do it and the jobs then start to pile up and you never get around to doing them.

 

Aerial Masts and Agricultural Machinery – a Bad Mix!

Field days are always a great day out and a challenge. The thing is that even in the middle of an empty field (or near empty), and no matter what risk assessment you may perform, there is accounting for the stupidity of others and serious damage and financial loss could be the result.

This summer I was invited to take part in an event and turned up to a field with my van packed full of gear for a serious portable session for the weekend.

Upon arrival I checked out the field and asked the organiser where I could set up and was told, anywhere you like..we have the field to ourselves.

Having no reason to question the fact that we were indeed alone in the field, I set up my Racal PU12 mast and set up my NATO tactical Antenna on it which was huge, but as I was well pass the access points into the field, I thought I was well away from anywhere people would be driving vehicles in and out. I asked if I should put some fluorescent picket fencing around the base of the inverted V antenna ends, but was told that I am so well out of the way, no one is going to go anywhere near me.

Everything was going swimmingly for the first day, then I decided to drop the antenna and change it for a three element tri-bander. I disconnected the antenna ends in preparation to swap the aerials and dived in the back of the van and started putting together a workmate bench which I was going to use to support the main boom of the tri-bander while I attached the elements. While is was in the back of the van I heard a noise which sounded like tractors.. I came out the back of the van to see my mast almost bend double with a piece of farm machinery spinning and spooling up my antenna.

Some contractors had come into the field to pick up a load of dried grass and bale it as hay. The problem was that no-one told the field day organiser, or the guy who gave him permission to use the field.

Perhaps it did not seem important for the contractors to perform a risk assessment before charging into the field, but whatever, it caused a real lot of damage and some real political issues about who was responsible and how the damage was going to be resolved. Sadly it was impossible to find spare sections for the mast to replace the permanently bent or snapped sections. I was therefore out of pocket to the tune of about £500!

The site is important to the group and it was not practical to take the owner to task over the mixup about who should have been doing what in the field. Pursuing the contractors and causing ill will would have also created an issue, so in the end another club member who happened to have a ‘spare’ mast offered to help restore the losses.

In the end, the message I took away from this was: If you feel that certain procedures would be good to follow on health and safety grounds, then do it, even if people say you don’t need to. I allowed myself to get dissuaded from putting up picket fencing as a warning about aerial ends. Also that no matter how confident you are that the people in a field know what they are doing, there is no accounting for the poor work practices of others, who should not have been in the field at the same time as the field day group.

I have not mentioned any of the parties involved, but apart from me being totally apoplectic at the time and wanting to sue the pants off of anyone involved, taking a step back and being reflective allowed for other things to happen to help repair my losses. Hopefully it means that the field can still be used by the radio group, and the status quo is restored.

It just means that Risk Assessment will be a higher priority on my next /p expedition, and to presume that everyone will act like an idiot around my mast and aerial setup! OK My NATO antenna can’t be replaced as they are as rare as hens teeth, but the upside is that I have plenty of kevlar aerial wire with which to make new home-brew dipoles, delta loops etc!

Stacked array for 70cms

You might have noticed in the last picture in the blog, not only was there an MA5B on the mast, but I also have a quad 70cm omni array.

 This is the Jaybeam quad array just after being purchased at Dunstable Downs

The aerial was spotted in the back of a pickup truck with a whole load of ex-PMR stuff, and was purchased at the princely sum of £35. Bargain!

This was part of the plan to develop the 70cm side of transmission for GB2RS, the news broadcasting service of the RSGB, which i read for most Sundays. I have been using a duplexer to simulcast from two transceivers on my colinear, but the opportunity for a catastrophic failure was huge, with a fault developing on the duplexer possibly dooming either of the transceivers to meltdown! It would also allow me an opportunity to run maximum UK power on the array, which could handle it easily without melting! This is something the colinear could just NOT do.

I am now looking for a serious UHF linear, which is not going to bankrupt me. If you hear of anyone that has one for sale, please let me know.

 

Aerial rethink Part 2. Cushcraft MA5B

After using the radiator of the Jaybeam as a dipole for a while, I was really missing the Cobweb, as it provided more wavebands than the Jaybeams 20m, 15m, and 10m. I was also considering just keeping the cobweb as a backup and getting a mini beam with some gain.

It would have three advantages. Multiple bands, Gain and a reasonable front to back ratio. Ever since I have got my licence, I knew that I fancied a Cushcraft MA5B. This is a three element trapped beam with capacity hats. Whilst not offering the same performance on all bands, it is probably the biggest all around beam I can get away with at my QTH, but try as I might, I could never find one at a price that I could afford.

Well in July 2017, that all changed, when I heard that Roger Mansell Williams, M0RMW was selling his bungalow and downsizing his setup in a move to Selsey Bill! He was offering his MA5B for just £50, which is a considerable saving over a new one, which cost upwards of £530! All I have to do was to go down to Farnham in Hampshire to take it down.

It came down really easily, it had been well looked after and was in really good condition. It fit OK into the jag with the back seats folded down. Roger was a gent and provided a manual for me to piece my new jigsaw puzzle back together again. It was not too difficult as I put insulating taped codes on the elements as it took it apart to aid with reconstruction!

Waiting for a couple of days for a lull in the thunderstorms, I managed to whack up the beam in a few hours, consigning the Jaybeam radiator elements back to the pile of aluminium down the side of the house, which is the Tribander. Initially the I used the mini beam using the internal matcher in the Icom and it worked will out performing the wire antenna by at least 3S units and being far less susceptible  to noise. In increase of the signal to noise ratio meant I could hear station I just could not hear before. In order to increase efficiency, I will go through a tuning session with the antenna analyser. This will increase transmit efficiency and reduce losses to make this acquisition a real bargain and my find of the year.