Friday, January 15, 2016

Weekend Project - 30 meter Loop

Here's a nice little project which should only take about a day to complete. I found it while trawling the net a few weeks back. It's for a 30 meter loop antenna, very easy to build and so far seems to work well. I've got it strung across a couple of trees, unfortunately not very high about 20 feet but it works reasonable well and is a bit of fun for a weekend project. Have a go and see how you get on.

This antenna is an easy construction project.  It was made out of common number 12 stranded electrical wire.  The side and top attachment points are made by removing two inches of insulation and wrapping and soldiering in short lengths of wire to create small loops. Non-electrical rope should be used for the support line and side pull out lines.  The bottom insulator should be about 3 by 5 inches in size and trimming the antenna to resonance was done at the bottom.

Start with the formula of 1032/Mhz to determine the total length.  I ended up pruning about a foot off of each side to achieve resonance at 10.125Mhz.  I used 72 ohm RG59 for the matching section.  Make sure you take into account the velocity factor of the coax when cutting it to length.  One method is to place a 100 ohm resistor at the end and use an antenna analyser designed for 50 ohms to measure for zero reactance (and SWR) while trimming the section to the correct length.
 
At 10.125Mhz, the SWR is 1.1/2 : 1, R is good at 50 ohms  (When I got these results, I decided not to build a balun).

Within a couple of hours of putting up the antenna I had made five DX QSO's.  It has performed well ever since.  The antenna is not overly directional probably due to the wire sections all being 45 degrees with respect to ground.

Thursday, January 7, 2016

Sending CW with confidence and QRP Work With the OHR 100A

I'm still having some minor trouble with my CW sending in only that I have this fear of sending, it's all due to confidence from post stroke, I'm rectifying by deliberately sending a QSO everyday trying to gain confidence and thankfully it does seem to be working, although local chit chat on CW is rather monotonous!

It's similar to my speech which in all fairness you wouldn't really notice, but I'm a bit self conscious and know that I'm a bit quieter than normal. Hopefully I can gain some voice experience on Sideband, deliberately talking to all manner of Amateurs, eventually I'm sure I will lose the nerves!!

Radio wise its fairly quiet at the moment with just European stations popping up I haven't heard many US or Canadian or for that matter DX in general, I think its just fairly slack but occasionally you do hear the odd station from some distance.

So I'm mainly doing QRP work with local stuff using the Ft2000D on low power or the OHR 100A at 5 watts. This is a pretty neat QRP rig that the XYL bought a few years back as a prelude to me building the K2. I really like it, probably use it as much as the K2  because its so easy to set up and use. The receive capability is very good for such a small kit and the only pain is it tends to drift on warm up, but that is on for the first ten minutes and then it's fine for operating.

The  OHR 100A kit was fairly easy to build, the only practise I'd had beforehand in kit building were the Rock Mites, so I was really starting from a early building position and I found little problems with the OHR 100A.
It's set for 20 meters and does a good job and banging out CW at 14.060 I can guarantee in good conditions I'll get an answer with nice RST reports. If you are thinking of a 20 or 30 meter kit I'd certainly recommend the OHR 100A and its not that expensive either! The only pain when purchasing for UK buyers is it comes from the USA so you have to pay £30 import duty.
Here's the site:  http://www.ohr.com/ohr100a.htm


 
The OHR 100A
The box on top is a home brew frequency counter, very useful.
 
 
 
Very easy to build and produce good results.

Monday, December 28, 2015

When something goes wrong!

I had a great pre Christmas plan to sell some stuff on eBay and then with the money provided I could buy  some new toy to play with after Christmas.
All was going well and according to plan, I'd sold a Microreader, a datong morse tutor and another few bits and pieces. Then it began to go wrong the micro reader didn't arrive at the buyers address and now we are in the process of claiming from the great British postal emporium and me having to refurbish the buyer.

Not the best of outcomes but I've heard of the things happening before and unfortunately it's now happened to me! No doubt I'll pay the money and then all of a sudden it will be returned to me, or turn up at the buyers postal address...typical!

I'm a bit stuck antenna wise at the moment because my MFJ 359 has been borrowed by a friend so I am at a loss without it and cannot design, fix or play antennas at the moment which is rather frustrating. I'd like to do some checks on my latest 30 meter offering at the moment because the SWR is not quite 1:1 its  more like 1:5/1:9 and rising probably because of all the gales we've been having but it could definitely do with a service and a quick check more for my sake and sanity.

I hope you all had a good Christmas and Santa provided some good radio equipment for you all, I did rather well especially with a new fire extinguisher for my shack which hopefully I'll never have to use in anger!
I also had a rather nice morse key arrive which is taking a bit of time to get used to but with a little practise I should get there. It's an old Murphy admiralty key which presumably must have some history, but searching via Google I haven't had much luck.

 
Especially as it has the old call sign of a previous owner. But I will do some more searching and no doubt some information will appear.

Some of you will notice I've changed the layout and design of the Blog, simply because it's the start of the new year and I definitely wish to start 2016 with a brand new attitude and purpose. 2015 was a ghastly year with bad health for me and others in my family. Bring 2016 let's have a nice new start!

Wednesday, December 16, 2015

Another QRP Kit

I'm beginning to think about building another kit, although what to build is the question, I'm getting the itchy feet syndrome!
I fancy something small like 3/7 watts of power but with a bit of intrigue in the building process to keep me interested. I'm looking at Pacific Antenna they have a nice tri-bander the KD1JV which looks pretty neat and I could set it up for 40, 20 and 30 meters band.

It doesn't look too difficult to build after all I have built a K2! So  it shouldn't be too bad the only problem I have is alignment but I'd cross that bridge when I come to it.
That would certainly keep me busy for a while and use my brain a bit which would make a nice change!

The QRP kits are becoming more and more popular now, especially on sites like eBay I noticed Hong Kong and China are selling lots of cheap 40m kits but only 40m, can't understand why surely there's a call for the other bands.

I 'm a bit suspicious about the 40m instructions, which tends to put me off, if they supplied more details in their adverts I would be more confident in purchasing them.
I find the instructions can definitely make or break a kit and the satisfaction you have in building, if you go through a difficult process it's not much fun. So I've been checking their reviews to see what others buyers have said but it only seems to be for other items not 40m kits!

To all my readers have a happy Christmas and New Year and lets hope 2016 is a good year for Radio!

Friday, November 6, 2015

Back at the Helm

Well it’s now nearly 8 months since my unlucky experience and I have to say at last I’m beginning to feel fully back to normal.
The tiredness has gone and my brain seems to be reasonably engaged (the XYL would probably disagree with that!) and the CW seems to be coming back although I am suffering with what I would call CW block which is a more common problem of fear of sending. I just force myself on air and once I’m actually sending the fear goes away. The other problem I have is when I'm tired things seem to go backwards in the CW dept and I have to learn to be very patient, sometimes I have good days and sometimes bad.

The bands are not that good at the moment and I’m limited to the European stations, I haven’t heard the States for a while now which is rather disappointing. But I 've kept on the low bands for most of the time trying to build up speed with the local community.

Sometimes I look at the kit I have and feel I really do have too much, especially in the transceiver department! Kenwood TS 570 with SP23 speaker, Elecraft K2 and various kits all lie about used every so often but not nearly enough. Then there’s what I call the battleship, the Yaesu FT2000D which now I have got used to, a fine radio with excellent DSP capabilities and is a good rig for my CW antics and a lovely speaker, the Palstar SP30H. I must admit when I bought it I was going for its little sister the SP30, but the shop offered a large discount if I paid a little extra for the 30H and I’m very pleased I did, such a bass sounding speaker SSB sounds like FM radio all the time, brilliant!

I’m not a contester more quick CW contact, chat and move on, exploring the bands and seeing what’s about each day. I like to spread across the bands in my search even doing a bit of short wave listening, if you never tried its great fun.

Unfortunately with the recovery  I have had to return to work and am now back full time which is creating less time for the radio work. But I must be grateful for my health and do the Radio hobby when the time is right.

Monday, August 24, 2015

The Club Field Weekend

The local club, CARA (Cheltenham Amateur Radio Association) has a field day coming up over the UK bank holiday which is the 28th August 2015. We will be on air for most of the weekend so there will be lots of different things to try out. This is quite good for me because I can really get down to practising some CW and it’s literally just down from the house and so the take off point is some 700’ above sea level which is very good and we won’t just be having local contacts we should be transmitting out all over the place! 

I'm bringing my Rock mites that I haven’t used for a while and some antennas that have been laying in my shed doing nothing. There’s a twenty and a  forty metre antenna and I’ve got the old 50 Mhz antenna somewhere so we should have some fun, especially as some members are staying up all night to see who they can contact. So anybody across the pond look out for the club call sign GB5BK or my call sign M0AUW over that weekend for a good chat! Or maybe you like to set a sked ....Gives a shout!

Friday, July 10, 2015

CW Frustrations

The annoying thing about having my stroke is waiting for your morse code to come back up to a reasonable standard.

 At the moment reading morse is very difficult, the brain is just not working on all cylinders which is most annoying. Imagine that you know a language fluently, but you have now lost the ability to interpret it? That's what has happened to me with the morse, I used to be able to work eighteen words a minute no problem, but now I'm struggling to hit ten! 

The problem is I can't translate the letters fast enough I track one letter and second later I've written it down but by that time the sender has sent three more letters! Then you get very annoyed and you don't concentrate so you lose the conversation.

 It's getting better slowly and in time I'll be fine but very frustrating it's taking so long but it's a good judge of where you are in the recovery process. Mentally I'm still struggling but physically I'm doing well, I cycled my first ten miler the other day which shows the strength is coming back, hopefully I will be doing a twenty miler in the near future. 

I've gone berserk with new morse keys, I got a lovely old Admiralty NATO key and I have ordered a Spark hand key from Bengali but it won't be ready until mid July, but I can wait I'm not exactly busy at the moment! Most days I practise on the computer listening to G4FON or "Just Learn Morse Code" I generally do about 15/20 minutes a day to keep me in check for when the fog finally clears from the head.

The radios are all performing as they should but conditions have not been that good, mostly European stations but it's enough to keep me in absorbed with the hobby. Antenna wise I'm playing about and doing the usual running repairs to keep me occupied I think I am going to have to start planning another antenna build to keep the brain active, any suggestions? I quite fancy something for 160m but keeping it fairly small and low key.

Wednesday, June 3, 2015

50 HMz

Keeping up with the amateur fraternity is quite a business these days, I notice on the new FT 2000 D I have 50 MHz or 6M availability, I've never used 6M before so it might fun but first I've got to build an antenna. What to build? Something quick and easy, probably a 5/8 vertical I think! I've got some old aluminium  tubing somewhere about, it's an old vertical I had for 18 meters I suspect I'll be able to re arrange length and add a ground plane of some sort to make a 50 MHz antenna. It be interesting to see how the take off point is for 6 meters around here I'm told it's quite good!

Well its up and running and results are not too bad lots of Europeans but I need to get to know the band to find out more information. The picture is showing the antenna low, normally when in use I raise the pole to around twenty feet.


The cobweb is now progressing I changed my mind and am going to complete the G3TXQ version as the G3TPW has given me lots of problems its early complete the but the measurements may be out and after the first SWR readings I gave up I don't need the hassle when I feel like I do! So far I have completed two of the elements 20 and 18 and am awaiting further speaker cable and have started on the frame there's no doubt I didn't get the frame quite right for the G3TPW so I've gone back to the basics and re-read my own description of how I did it (far easier!) I  couldn't understand how I managed the fibreglass poles to sit in the clamps and not be crushed before, then I realised they sat in their own metal sheaths!


Still a fair way to go yet but if I can get the cobweb  performing like the other I'll be well pleased! I've got the poles to sort whether to use the fibreglass ones or the old lightweight wooden ones. 
Then there's finishing off the elements I should think that will take me a few days.


I haven't a clue what to do with it when I finished perhaps I may sell it see what happens I could always start a cobweb business!

Sunday, May 24, 2015

New Toy

I think this Stroke recovery  thing has effected me more than I thought!
Gone is the FT 1000 MP Mk V and in comes the FT 2000 D, better receive capability and 200 watts of power. Getting used to the DSP facility is tricky and will take some time but I'm confident I'll get there. I also have managed to pick up a kenwood TS 570D for a good price off Ebay so I'm doing well at the moment! Now all I need do is sell the FT 1000 MP Mk v (I already have a bid), and build and raise the cobweb antenna and I'll be happy. Lots selling on Flea-bay at the moment, an auto ATU, an old VHF handheld and the filters for the FT 1000. Got to get some money up to offset the  FT 2000 D.


The new FT 2000D

My Morse is gradually improving as the days go by so far I've managed one small QSO with a German station who was very kind and slowed right down for me.This was on The TS 570 which is proving a good back up while I wait to learn about the FT 2000 D. I did think about keeping the FT 1000 MP but I thought it might be too exuberant! And I need some money to offset the price of the FT 2000. The Kenwood will suffice for coming months then I 'll have a think and see what else is about!



The New Looking Shack!

My walking is coming on well and I can now walk with the dogs again which is good news. I can walk about a couple of miles now which isn't bad considering what I've been through. The other noticeable difference since having the stroke and recovering is my CW which is coming along nicely but my writing,  I can't keep up and my receive is suffering for it I need so I need to practice my writing and also do some more  receive work. The Cobweb is coming along slowly I'm having trouble getting some spare parts. You may know the kit I bought is not that good and I have reverted back to my design which needs more parts from eBay.The actual poles I ordered are very good but too thin for my design so I am changing back to light weight wooden design I originally had ( why buy some poles if you have decent wooden ones?)Ah well time flies when you having fun more updates later.

Sunday, May 3, 2015

Update for May



I’ve had a life changing experience since I last wrote. On 30th March I had a stroke - luckily my wife came back from walking our dogs just in time and managed to call an ambulance which got me got me straight to the hospital very quickly. They gave me a clot busting drug and after a very scary first day or two, I have made a remarkable recovery so far. Evidently I had a brain stem stroke which is quite serious and lock down syndrome which means total paralysis; I could only move my eyes which was quite strange, but luckily a doctor noticed this and was able to communicate with me so at least I was aware what was happening. After various stages in different wards at Hospital I eventually ended up on the stroke ward at the General Hospital where I was well cared for.

I came home the other week having stayed there for about 3 weeks and now am having lots of physio etc at home. I've been very lucky and don't have any paralysis but do feel very tired and I'm a bit wobbly on my feet. My speech is improving all the time but does deteriorate when I get tired, so I find it difficult to speak on the radio for long periods of time. It is early days and if I carry on improving as I have been doing I am sure I will make a full recovery before too long.
CW is a bit strange I’ve had to stop the local club challenge (locating & contacting the 73 countries that make up the whole of Europe!)as my control of the key both paddle and up & down key has somewhat slowed right down, (5 wpm) which is most annoying!

 I’ve bought myself a new VHF radio as a present for getting better so quickly, it’s a Alinco DR138_H 2 meter transceiver with 60 wtts of power so I can get out from the house quite easily. It’s a very nice radio all for the princely sum of £64 which I reckon is pretty good deal! I’m still learning how to work it, gone are the days of simple instructions, this thing takes quite a while to work especially if you have lost all of your coordination skills!

I’m also on the lookout for a manual ATU for my K2 transceiver, I’m getting annoyed having to alter the LDG auto tuner every time I use the rig at more than 10 watts of power so I figured a manual tuner would be better and I could adjust for accuracy. I know most would find it annoying to have a manual but they seem to be more accurate than the auto ones so I’m going buy one and see.

 I’ve also decided to make another cobweb antenna as a project to keep me occupied for the next few weeks also to improve my coordination skill. I have built two already, so I am quite experienced in making them. Although I wont start from scratch as that would be too difficult, so I have bought a semi built one off EBay and will alter it to my specifications’ my interest in Cobwebs started along time ago and so far I’ve built two  have been the

G3TPW original and the G3TQX and this time I shall have a play  and do my own design changes to get the best out of it and have a bit of fun!