WAB TL70 RSARS 4267 103m ASL
Skype: g8cyk.cq EchoLink G8CYK Twitter @G8CYK
NEWS: What is CYQ?
I am trialling an idea I am developing for "break in" CQ calling, where calling. CYQ means "call anytime you like, and I will hear you". CYQ means full duplex operation on a single frequency.
This scheme is best used on 40m and above, with stations more than 100km away. Close stations may not be heard.
It's not witchraft, more details in due course.
Thanks for stopping by - I am just back after 35 years away - girls, wives, kids, mortgages, college fees - now it's MY turn. :-)
That is not a current mugshot! Chelmsford is the spiritual home of broadcasting, where Marconi made early broadcast systems in factories dotted around the town. As the result of some bad decisions by successive town councils, we are struggling to create a proper heritage facility to recognise and celebrate the simple fact that Chelmsford (Essex, UK) is where most of the rules of early wireless were explored and developed from the early 1900s through to the 90s.
(And joined by studio TV cameras along the way in the 40s until Japanese companies took over when Marconi dropped that ball, amongst all the others, in the 80s/90s)
... and this is not my current radio room, but it's interesting to note the basics of shack layout have not changed much over the years...
Chelmsford Amateur Radio Society does its best to keep the memories Marconi alive - from the 1920s through to 90s, Marconi was Chelmsford's largest employer, occupying numerous buildings around the town centre and a research facility at Great Baddow with an antenna platform, that I would like here.
The Great Baddow Tower / Mast is the remains of Britain’s early warning defence network from WW2. A series of masts formed a line along the British coast in what was called the “Chain Home” and these detected enemy air craft as they approached across the North Sea and English Channel. This is the only complete radar tower left. It was moved to Great Baddow in 1954 and used by the Marconi Company to further develop radar. The tower is 110 metres tall (360 feet) and consists of six cantilevered platforms with observation platforms.
After a 35 year gap (see below) I began this phase of my ham life in 2016 rather impatiently when a 20W HF all mode X108G arrived - and I used a garden fence as part of a "quick and dirty" antenna... it loaded very well using a Tokyo Hypower Pi match tuner - and I worked more UK and Europe stations than I really should have done, with such a curious antenna. But things have advanced!
There is now a sloping long-ish wire tied to a branch, AKA the "CYK Rubbish Antenna", which goes to show that a little Royal Signals training and cunning still works ... frequently getting 5/9 back from stations running >500W into beams and quads.
I am embarrassed to admit what I am using.
My next project is to work out how to insulate and load the 6 section aluminium flagpole.
It plainly has little ground wave performance - on any HF band - as stations ~5 miles from here are barely audible. Maybe the earth bank running along on the East acts as some magical skywave reflector? This might also keep the noise levels down?
The main HF antenna is currently an embarrassingly simple 33m of wire rescued from a skip (hence the "G8CYK Rubbish Antenna") end fed, via a (hamgoodies.co.uk) 16:1 UNUN matching transformer - in turn fed using 16m of RG58 from the MFJ ATU with handles the SWR perfectly although cannot perform magic - and with a galvanised wire (earthed) and wood paling garden fence as some sort of counterpoise.
This combo can be tuned 1:1 on 160-10 and has got me around Europe and N America with 20W- 60W.
This is a 24MHz sweep from 2-26MHz.
So basically resonant on 7Mhz, 11MHz, 16MHz (this pic's marker) 18MHz and 23.5MHz. I need to work on taming it...
The home made slim jim for 4m also works OK on 6m as a halfwave something-or-other.
Having cut and tested a reference 20m dipole (at the same height) to compare with the Rubbish Antenna to see if I was missing out, I found the dipole to be around 20dB worse in terms of S/N on receive. It loads and tunes (1:1) as expected, so it is not a short in the coax. BUT I did not use balanced feeder, and/or a balun feed, otherwise I have no explanation why it is so awful when compared to the Rubbish Antenna. I need to get some measurement tools and plot exactly what is going on.
The G5RV erection - 14DEC16
Well, we got a real one up about 45 feet high, with 1:1 balun for a 50ohm feed to the tuner, about 30 feet below the feed point
The analyser shows it's rather less well tuned than the random Rubbish end fed antenna, albeit the peaks are on the amateur bands but the first contact was New Brunswich on 18m, and the next was West Virginia. Saved by the MFJ differential tuner. But there is more work to be done to work out what actually goes on.
Maybe one useful test would be to erect another G8CYK rubbish antenna at 65 feet, and end-feed it? I have a suspicion this 5RV is also picking up a lot more ADSL noise which makes anything below 6MHz pointless. Hoorah for web SDRs, boo for BT.
AND you really should graze through the qsl.net ultimate wire antenna page - 287 types to look at, but not one of them is a CYK Rubbish special.
CYK Antenna Field Project
This is the tale of a fenced field near here that has magical RF properties. I just took the dog for her evening stroll an took along a Tecsun HF portable. to check out 40m at 22:00z. I heard a couple VKs 5/9 as I approached the wire fence and overall more DX and less noise than I have ever heard on 40 from the "real station" antennna and receiver 300m away.
A field well away from interference sources 300m from here has recently been fenced by the farmer using two strands of galvanised wire stapled to wooden posts. The wires are about 0.7m apart with the lower one about 0.7m off the ground. The field is facing NNW with about a 30m decline to the North. The perimeter is 1.34km and a long side is 500m. What sort of an antenna might this make, I pondered.
So I connected a Yupiteru MVT-7100 wideband scanner to the upper wire the other evening around 10pm, to see how it worked with top band, and it was epic, requiring rather more attenuation than the scanner could provide - but by using looser coupling (waving the telescopic antenna near the wire) I could hear big signals with none of the s9+30 noise I suffer in the office..
So I then took the antenna analyser and connected the input to the top and the ground to the lower wire and got the results shown with a near resonance on 3.5MHz. I moved 30 feet down the wire and tested again, and this time it was resonant around 1.6MHz (2MHz X axis grid). So I am guessing that by measuring at various points it will be possible to get quite accurate 160m and 80m matches.
Connecting the analyser the other way round - ie the "signal connection on the bottom, and earth on top produced a surprisingly useless result, considering how random this process has been so far. A flat line along the top with a couple of ripples without a hint of resonance. I should have taken a picture.
I was first licensed at age of 15 in 1968, and was an active 2m/70cm QRP experimenter when 1W transistors cost >£5 in REAL money in the 60s/70s. I got hooked on designing and making RX/TX things, and generally creating world class TVI :-). And I would love to do all that again - in spite of all the imported gear that seems to have stunted much of the creativity in the hobby. Maybe not so much TVI, though, although digital TV gives precious few clues and simply breaks up when interferred with. Many neighbours of hams with discreet antennas (ie not 60 foot towers) probably have no idea why their TV goes on the blink every now and again. Satellite TV is probably 100% immune.
I have been away from amateur radio since 1985, mostly thanks to WKM (wife/kids/mortgage), and a career with computers and internet - some of you still seem to remember I was one of the founders of the Ambit mail order business in the 70s, specialising in wireless components at a time when no one else did. You can download PDFs of the famous Ambit catalogues at http://usp.net/ambit
And like many others approaching retirement, I am exhuming old interests and finding the amateur radio scene (especially in Essex) has never been more vibrant, but the use of the excellent 2m, 6m and 70cm repeaters is minimal.
I suppose the old addage about "content is king" is relevant to amateur radio as much as broadcast radio, and there are only so many discussions to be had about antennas, microphones and begonias. You would think the makers of the gear would have thought this through and come up with more engaging ways to get people to use it, but no evidence thus far. Contests seem to have a negative effect, and just drive "normal" amateurs away.
The absence of CRT display scanning noise is wonderful, although XDSL and dodgy SMPS - especially LED lighting - is a considerable but fixable menace. Reception below 7MHz is generally compromised by noise, probably ADSL and VDSL from overhead BT cables, and that is my next challenge. Replacing all first generation LED Mains lamps made a big difference - and leaving just one dodgy LED lamp can be fatal, since the lamp itself is not the issue - the house wiring to the switch and lamp is a very effective antenna. Meantime, the various web SDRs can provide respite and workarounds.
Equipment in use
For HF, I presently use the only rig to have these days - the almost ubiquitous IC7300. Here is my 10p mechanical audio filter mod. Just move a piece of (well sanded) 4x2x3 inches wood (or thereabouts) around on the speaker louvres.
- and a seperate WinRadio Excelsior SDR receiver/scanner.
Frequency range 9 kHz to 3500 MHz (except cellular bands where required by law)
Ultra-fast search speed 1 GHz/s
And always remember - Ham Radio is just another form of fishing...
7952107 Last modified: 2017-03-08 00:20:18, 20923 bytes
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