Bill Watson

New Moxon aerial for meteor radio scatter

From: bill Watson [mailto:bill.g4eht@yahoo.co.uk]
Sent: 27 April 2017 17:31
To: Thornett Andrew (05Y) Walsall CCG
Subject:

 

HI ANDY

WE HAVE……………GOOD NEWS…….AND………BETTER NEWS. !

I HAVE TESTED THE 2 MTR MOXON…….IT IS FINE…..ABSOLUTELY NOTHING WRONG WITH IT……ITS BANG ON RESONANCE…..NO PROBLEMS. I TRIED MOUNTING IT VERTICALLY THOUGH………….NO CHANCE. !! HAVING THE POLE BETWEEN THE 2 ELEMENTS IS A……NONE STARTER. – SENDS IT WAY OFF RESONANCE, AND THE SWR GOES THROUGH THE ROOF. !

MOUNTING IT VERTICALLY WOULD MEAN USING A …NONE METALIC SUPPORT AT THE TOP SECTION…..AS I POINTED OUT. SO……I SET ABOUT MAKING YOU ANOTHER ONE ANDY. THIS ONE, I HAVE DESIGNED DIFFERENTLY……ITS MOUNTING POSITION IS DESIGNED TO FIT AT THE BACK OF THE REFLECTOR, AND NOT IN THE MIDDLE OF THE 2 ELEMENTS.

WHEN DESIGNING THEM LIKE THIS, YOU ALWAYS HAVE TO MAKE SURE THAT THE DISTANCE BETWEEN THE REFLECTOR AND THE MOUNTING POLE IS STILL NOT TOO CLOSE. !    A SIMILAR DISTANCE BETWEEN THE 2 ELEMENTS ID USUALLY SUFFICIENT….SO THATS HOW IT IS BUILT. I HAVE RESONATED IT AGAIN, SO THAT IT IS USABLE FOR 2 MTRS……IT CAN NOW BE USED EITHER VERTICAL/HORIZONTAL VERY EASILY WITHOUT BOTHERING ABOUT THE TOP POLE NOT BEING MADE OF METAL. I HAVE ALSO TREID USING IT FOR YOUR ‘METEOR RECEPTION’…….BRILLIANT. !

I MOUNTED IT VERTICAL FOR THIS TEST OF COURSE, HOWEVER I HAVE HAD ANOTHER THOUGHT. YOU PROBABLY HAVENT HEARD OF THIS ANDY – SLANT POLARIZATION. THIS MOXON, YOU CAN NOW EASILY…………SLANT POLARIZE…..IF YOU WISH. BY DOING THIS, IT’S POSSIBLE TO ( IF YOU LIKE ) GET THE ‘BEST OF BOTH WORLDS’. A BIT OF VERTICAL…………. A BIT OF HORIZONTAL………WHICH, IF YOU THINK ABOUT IT, MAY WELL E BETTER FOR YOUR METEOR DETECTION. FOOD FOR THOUGHT.?

ANYHOW……ITS UP TO YOU, TO USE IS IT, AND MOUNT IT AS YOU WISH. WHAT YOU MAY OF COURSE FIND, IS THAT AS YOU WILL NOW HAVE THE CAPABILITY OF EXTRA GAIN DUE TO IT BEING DIRECTIONAL  ( UNLIKE THE 5/8 VERTICAL )  AND BEING ABLE TO MOUNT IT VERTICAL AND BEAM SOUTH EAST, THEN IT COULD OUT PERFORM THE 5/8 WAVE. !!!!!!!!!!!!

HOWEVER…..IT WONT LOOK AS ‘NEAT’ AS THE 5/8  FOR YOUR XYL AND NEIGHBOURS. !

ANYHOW………ONCE AGAIN…ALL VERY WELL MADE AND SET UP, AND FOR CERTAIN IT WILL MAKE YOU A EXCELLENT PORTABLE AERIAL ANDY.

LET ME KNOW WHEN YOU CAN PICK IT UP, OR I CAN EASILY DROP IT OFF FOR YOU WHEN YOU ARE IN.

BYE FOR NOW

Vy 73……………..de……………….Bill…………..G4EHT

Further success recording meteors at LRO by radio scatter 22-23/4/2017 (Lyrid meteor shower)

The combination of our Yaesu FT-817 radio, high quality feeder cable and Bill Watson’s carefully hand-made 5/8 vertical aerial (made to be resonant at 149.049MHz) at 2.4m height (top of log cabin – neighbour politics mean I can’t have it higher) has led to great success detecting meteors by radio scatter during this Lyrid meteor shower – the best detection rates we have ever had in Lichfield. This demonstrates the importance of using a sensitive modern radio and a resonant aerial when detecting meteors.

I have also spent today trying to get FunCube Dongle Pro Plus working – without success!! I need help with this!

We proved that 143.049MHz Upper Side Band (on Yaesu appears as 143.049.00 R MHz USB) is a good frequency to detect meteors, the carrier for Graves appears intermittently and then goes again, when it does appear it varies up and down consistent with pulses from the radar, and that a resonant aerial is required.

Andy

Best screenshots from the Lyrid Meteor Shower 20-23/4/2017:

 

Following shows 2 typical meteor peaks but also shows Graves carrier which is usually not seen – meteor frequency is offset from the carrier.

2 meteors – these are probably 2 fragments of same meteor coming in one after the other:

Large rolling meteor – up and down with time as surface area increases and decreases with roll of meteor (below):

3 successive meteors:

                

Meteor below shows variation on frequency axis – this is due to multiple fragments together travelling at slightly different speeds – Doppler effect changes frequency:

Excellent example below of large rolling meteor:

     

Screenshots below show the 3D Spectrum Lab screenshot and also the WSJT-10 waterfall – this shows the ping that is seen and also heard if the computer’s speakers are turned on (audible ping not recorded here):

 

A possible reason for lower than expected numbers of Lyrid meteors detected before midnight by radio scatter from Graves last night

HI ANDY

JUST TO LET YOU KNOW FIRST OF ALL….

I AM SENDING THIS ON THE LAPTOP YOU AND RHYS KINDLY GAVE ME….I HAVE MANAGED TO GET IT TO TETHER TO MY FONE. IT IS EXCELLENT…….MANY THANKS TO YOU BOTH…

DEZ IS DOING HIS CONTEST…….BUT CONDITIONS ARE VERY DISTURBED AND THERE IS A GEO-MAGNETIC STORM THIS COULD WELL BE A FACTOR IN WHY THESE METEORS HAVE BEEN VERY SPARSE  TO BE DETECTED…..SO ANOTHER THING TO TAKE INTO ACCOUNT FOR FUTURE REFERENCE.

I WAS PLEASED TO SEE THAT PLANET THRU YOUR TELESCOPE. IT WAS REALLY GOOD TO BE ABLE TO SEE THOSE BELTS VISIBLE ACROSS IT……ALSO THOSE MOONS TO THE SIDE TOO.

THANKS AGAIN……………I WILL TRY THE ANALYZER ON THE 2 MTR MOXON……AND IF ITS OFF RESONANCE FOR ANY REASON I WILL ADJUST IT ACCORDINGLY.

BYE  FOR NOW

73…………..de,,……………..Bill………………G4EHT

Observing Log 22-23/4/2917

Observing Log 22-23/4/2917

Andrew Thornett

Damian, myself, Bill Watson and Rhys observed from Rhys’ and my garden in Lichfield.

Ten inch Orion Dobsonian Telescope, 20mm and 9mm Explore Scientific 100 degree field of view eyepieces, 6mm Televue Ethos eyepiece, Televue Paracorr coma corrector, Telrad single power finder, Sky Safari planetarium software on Apple iPad.

 

Tonight is the predicted peak of the Lyrid meteor shower. Thin high cloud limited visibility.

Jupiter, Planet in Virgo, 22 Apr 2017, 22:53:31. First object was Jupiter. Four moons arrayed alongside. I could see six belts using the 9mm Explore Scientific eyepiece. Collimation in ten inch Orion Dob could do with being better so I cheated and used my Televue Paracorr to correct it pending doing the job properly at some point. The annoying thing about Orion scopes is that they don’t have easy to use hand-turned collimating screws which makes correctly collimating more difficult in the dark (UK Orion). Bill had never seen Jupiter before and was appropriately impressed and pleased! Always a lot of satisfaction in showing newcomers to our hobby the large planets.

TYC 1472-0330-1, Star in Bootes, 22 Apr 2017, 22:59:46. This is the end star of Picot 1, also known as Napoleon’s Hat (because it looks like one). This is an asterism rather than a cluster of related stars but us a pleasant star pattern previously mentioned by myself and Damian in our night sky talks for RAG. I have listed the star rather than asterism as the asterism does not appear on Sky Safari’s search list but the star does so you can use that to locate Picot 1 in Sky Safari.

Delta2 Lyrae, Variable Double Star in Lyra, 22 Apr 2017, 23:10:42. The radiant of the Lyrids.

Sadly high level cloud means that telescopic observing almost impossible by now. Therefore we pulled out chairs for naked eye meteor observing instead.

23:30 For the last five minutes we have seen a strange green-tinged line extending from north horizon to south horizon, from below pole star through the zenith and close to Arcturus. This is not a usual location for a flight path over my garden although a vapour trail is the most obvious explanation. It persisted for quite a significant period of time (30 minutes at least). We watched planes going overhead and none of them left s trail like this. We wondered what this was? In past, one of our members, Nick, saw a strange vapour trail and it turned out to be from a rocket launch. I wonder……

23:20 Cloud getting quire bad now. We have not seen a single meteor and very little on the PC by radio scatter. Looks like peak was two days ago (based on detection rates by radio scatter on my Yaesu with 5/8 aerial) and predictions of the peak being this evening online were wrong. Just goes to show that meteor shower predictions are not always accurate.

Hercules Cluster – Messier 13, Globular Cluster in Hercules, 22 Apr 2017, 23:39:28. Well done to Damian for finding this in the smog! In the 9mm ES it appeared as large fuzzy ball. With careful focusing, we could resolve streamers of stars.

Jupiter, Planet in Virgo, 23 Apr 2017, 01:20:46. We took a break to read through the night sky presentation for RAG next week (the talk after the guest speaker has spoken) – its brilliant! Damian has done a great job – and then Damian and I went outside to see if we could see the Great Red Spot. Success! Right in the middle of the belt – seen with 9mm Ethos eyepiece. Sky has become somewhat clearer now, although I still wouldn’t describe it as great – still misty.

We then spent 20 mins sitting outside looking for meteors, as this was meant to be a meteor observing session. The computer in the log cabin was now picking up meteors by radio scatter approx one every 4-6 minutes – a significant increase on pre-midnight levels. This is the famous rain on the front windscreen effect as the Earth turned into the meteor particle stream so that meteors were directly impacting our side of the planet. However, visually, I was the only one of us to see a meteor. I think it was probably a Lyrid meteor as it was in the direction from Vega in Lyra towards the Pole Star and seen briefly as it transversed Ursa Minor.

We packed away at 01:45.

The evening had not turned out to be the lovely clear sky with hundreds of meteors that we had hoped but we had some great views and it is always great to spend an evening under the stars, however poor the seeing or transparency!

Andy and Dame

Success moving aerial to top of log cabin

More success! I have now moved the 5/8 homebrew aerial to the top of the log cabin. Still using Bill’s feeder cable and the Yaesu FT-817 – and still detecting meteors at 143.049.00MHz USB. Can’t make up my mind yet whether number of meteors detected has gone now with move of aerial…..numbers have dropped since this morning but that could easily be due to variation in meteor rates anyway.

Andy

Bill Watson’s response to Andrew Thornett’s post on success of meteor detection at LRO 20/4/2017

HI ANDY

JUST READ YOUR COMMENTS RE-METEOR DETECTION…..YES, VERY GOOD AND THE PICCYS OF COURSE.

YES…..ONCE I HAD CARRIED OUT MY OWN OBSERVATIONS AND WAS CONFIDENT THAT VERTICAL POLARIZATION WAS THE BEST I THEN DECIDED THAT WITHOUT DOUBT THE BEST VERTICAL AERIAL HAD TO BE CONSTRUCTED!

THE 5/8 IS THE BEST PERFORMER DUE TO ITS ‘LOW ANGLE OF RADIATION’ AND OF COURSE, AS ‘GRAVES’ IS SO FAR AWAY FROM LICHFIELD FOR VHF THAT WAS OF VITAL IMPORTANCE. THE PROBLEM WAS…….CONSTRUCTION. ! THEY ARE FAIRLY DIFFICULT TO MAKE DUE TO THE FACT THAT A PROPER IMPEDANCE MATCHING NETWORK NEEDS TO BE MADE AT THE BASE TO ALLOW 50 OHM IMPEDANCE FEED TO BE CONNECTED……NOT ONLY THAT BUT ALSO A PROPER ‘RADIAL SYSTEM’ NEEDS TO BE FITTED AS WELL. THIS WAS ACHIEVED, BOTH THE MATCHING COIL  AND RADIALS AFTER QUITE A BIT OF TRIAL/ERROR  TESTING…..USING THE ‘MFJ ANALYZER’ WHICH IS A …..MUST HAVE TOOL. THE OUTCOME……RESONANT ON……143.049…….IMPEDANCE…….50 OHM.

…………….NOW…ON TO RECEIVING QRG…TESTED TODAY

…………… DURING HIGH LEVEL OF ‘MS’ ACTIVITY.

OPTIMUM QRG……………………………………………………..143.049 Mhz……… ( usb )

TESTED QRG WHERE ‘MS’ ALSO RESOLVED……………..143.049.50 Mhz

TESTED QRG WHERE ‘MS’ ALSO RESOLVED……………..143.048.50 Mhz

PLEASE NOTE……………………..AT NO OTHER QRG WAS THERE ANY ‘MS’ ACTIVITY.

WHAT SURPRISES ME ANDY IS THIS…..THE BOOKS SAY…….143.050 Mhz……….IF YOU HAD TOLD ME THAT QRG FROM DAY ONE, WHEN YOU ASKED ME AT CHURCH A COUPLE OF YEARS AGO THEN I WOULDN’T HAVE RECEIVED A DICKY BIRD. I WOULD HAVE JUST THOUGHT…….NO……NO CHANCE….IT DONT WORK. ! SO, IT WAS FORTUNATE THAT YOU DIDNT TELL ME WHAT THE BOOK SAYS AT….. 143.050 Mhz…………..OTHERWISE YOU’D STILL BE TRYING. !

I WILL LOOK FORWARD TO SEEING YOU ON SATURDAY EVENING AFTER 9 PM

73…………..de,,,,,,,,,,,,,Bill………..G4EHT

Success with meteor detection by radio scatter from Graves on 143/049MHz at Lichfield Radio Observatory!

Fantastic news! We have successfully detected meteors again at LRO – and what meteors!! They were coming in thick and fast approx 1 every 1-2 minutes when Rhys and I left home today at midday. These are best detections we have ever achieved.

Credit for this must go to Bill Watson, our good amateur radio pal from Lichfield – without whom this achievement would not have happened.

If you have read previous reports, you will be aware that we have have been experiencing incredible difficulty detecting meteors at LRO for several months. Even before that, rates were a lot less than Peter Hill records with his setup. I could never work out why this should be. Then, last year, LRO stopped picking them up at all. I put this down to the old ICOM R7000 receiver giving up the ghost……

Having been on holiday for the last two weeks, this seemed to be an excellent opportunity to explore why we were experiencing these problems and to try and find solutions. The icing on the cake is that this weekend is the predicted peak of the annual Lyrid meteor shower. Wouldn’t it be wonderful if we could detect meteors again in time for this shower. The weather forecast was not good for visual observations but radio detection can still work with clouds! (Although note the forecast has now changed and predicts a clear night on Saturday so a great opportunity to observe this shower is now available).

The problem with working out where the difficulty was is that the Graves signal is not normally detectable – unless it bounces off a meteor. Therefore it is very difficult to be sure that the radio is correctly tuned – and of course if it isn’t then low meteor detection rates will be obtained regardless of other issues in the setup. To make matters worse, our investigations in the first week of our Easter holiday demonstrated that meteors can be detected all the way between 143.049MHz and 143.050MHz BUT that rates vary. Graves transmits on 143.050MHz but this does not mean that this is the best frequency to use – I must admit that I have not quite worked out why that should be but in the first week we demonstrated that it was very difficult for us to detect meteors at 143.050MHz and Bill confirmed this will his own radio equipment – which acted as gold standard for us throughout this exercise as he can detect meteors approx. one every 2 minutes even outside of meteor showers.
Therefore, there were several potential reasons why we might be experiencing difficulty detecting meteors:
(i) The radio was deaf
(ii) The radio was incorrectly tuned either because we were using the wrong frequency or because the tuning was off on the radio.
(iii) We were using the wrong band (needs upper side band).
(iv) The aerial was incorrectly tuned for 143.049MHz.
(v) The aerial was pointing in the wrong direction.
(vi) The aerial was horizontal when it needed to be vertical or vica versa.
(vii) The material used for the aerial mast (old steel poles from a trampoline) was interfering with the aerial.
(viii) There is a problem with the aerial feeder cable (e.g. water has got in to it).
(ix) The aerial is not mounted high enough.
(x) Our house is located in a radio dead-spot.
(xi) Software settings problems – we are using Spectrum Lab and we are finding it complex to get our heads around it.

Bill confirmed that the best frequency to use (using his own gear in Lichfield at his house) is 143.049MHz, upper side band. Detection rates are high here and even if this is not the best frequency it is very close to it with more than enough meteors detected for our purposes.

The next step was to use a radio that was proven to be sensitive enough to detect meteors and to confirm this. We opted to use our Yaesu FT-817 for the initial tests – a modern sensitive radio. We took this to Bill’s house and disconnected his radio and confirmed that the Yaesu is more sensitive than his own rig and easily detected the Kent beacon on 144.430MHz (www.gb3vhf.co.uk, the website of the 144.430 MHz and 432.430 MHz amateur radio beacons located at BT Fairseat on the North Downs in Kent) using his aerial in his garden.

I was also able to use my own laptop to record meteors at Bill’s house, so that I could demonstrate successful use of WSJT-10 and Spectrum Lab for this purpose (at least successful enough to be able to see meteors although I have problems with the programming script in Spectrum Lab software still).

Taking this Yaesu FT-817 back to LRO, we found that detection rates in the log cabin were poor using the Moxon homebrew on top of the cabin and we could not detect the Kent beacon. This should have been possible and suggested that either the aerial, feeder cable or position/location were at fault.

The next step was to take the 5/8 vertical (Bill has tuned this for 143.049MHz) and today we tried this in the garden at LRO using the computer in the log cabin and Bill’s feeder cable – success! The best meteor detection rate we have detected ever!

I also found a small program which works under Windows 8 (on computer in log cabin) called IrfanView which can be easily configured to record screenshots automatically – just by starting the program and then pressing “C” and putting in appropriate settings on the box that appears. This is much easier to use than Spectrum Lab’s scripting software and also allows screenshots of both WSJT-10 waterfall graph and Spectrum Lab to be simultaneously recorded together.

Our next step is to remove some of the poles on the 5/8 aerial to see how high it needs to be (wife and neighbour don’t like tall aerials), then to move it to the top of the log cabin in exchange for the Moxon there. If that works, we will then try out the feeder cable from the log cabin (currently using a new one from Bill) – as it is possible that water has got in to the feeder cable and is the cause of our problems). We then would like to try the FunCube Dongle Pro Plus as we do not wish to leave the Yaesu FT-817 permanently turned on – it is an expensive machine and we prefer to keep it in good condition, particularly as there is a risk of lightening damage to any radio connected to an aerial.

Andy & Rhys

Bill with his homebrew 5/8 aerial erected outside his house in Lichfield – this gives a sense of perspective on how high he mounted it:

Meteors being detected today at LRO using the 5/8 aerial:

IrfanView recording screenshots directing into a folder of our choice:

Settings on IrfanView for automatic screenshot recording every 30 seconds:

I think (but am not sure) this might be carrier from Graves which can appear sometimes for short while, depending on atmospheric conditions (Bill has confirmed this can happen):

WSJT-10 is useful to demonstrate that the input gain is 0dB – I set it to -1bD as it can vary by 2 dB and it is important not to let it go much above 0dB (better to be -1 to 0bD):

Possible Graves carrier signal:

Frequency on the Yaesu FT-817 which worked well for detecting meteors today at LRO:

Bill’s homebrew 5/8 aerial at LRO today – I have added a choke by winding the feeder cable into a loop:

The strange trace below is what happened when Bill changed the aerial outside his house!

The dial below shows the best aerial directional setting for Brams in Bill’s experience from Lichfield:

The dial below shows the best aerial direction for Graves:

Bill has also had success detecting meteors from Brams – this is the frequency he used:

Meteor detection at Bill’s house (shown on waterfall on WSJT):

The following is an alternative aerial Bill has made – a Slim Jim:

More meteors being detected at Bill’s house:

The frequency Bill uses for Graves (143.049MHz USB):

More on homebrew aerials for Graves detection (meteor radio scatter) 18/4/2017

HI ANDY,

FIRST OF ALL…….YOUR COMMENTS RE THE QRG OF GRAVES…..143.049 MHz DEFINITELY NOT ANDY……THAT’S THE QRG QUOTED AND THAT’S WHAT MUST BE ADHERED TO. !

I HAVE ONLY EVER USED THAT, AND UNLESS I HAD GEAR THAT COULDN’T TUNE EXACTLY TO THAT QRG THEN I WOULDNT CONSIDER TRYING ANY OTHER QRG…….UNLESS VERY CLOSE.

ALSO………UPPER SIDE BAND AS THEY SAY…AND NOT ANY OTHER MODE AS THAT WOULD MAKE THE QRG IN-CORRECT TOO.

SO…….IF YOU’VE NOT BEEN RECEIVING ANY METEORS THEN IT’S FOR SOME OTHER REASON…..AND CERTAINLY NOT THE QRG.

ANOTHER THING I WOULD RECOMMEND USING IS…WSJT9…AS I KNOW HOW RELIABLE AND ACCURATE THAT IS TOO ANDY……I DONT LIKE THAT SPECTRUM LAB PROGRAM……..IT APPEARS COMPLICATED, AND THAT’S THE LAST THING YOU WANT…….YOU JUST WANT TO SEE A NICE WAVEFORM/WATERFALL……AND INSTANTLY SEE/DETECT AND METEORS OR PINGS, AND THATS EXACTLY WHAT HAPPENS WITH WSJT9….YOU ALSO HEAR THEM TOO (UNLESS YOU ARE SOMEWHAT DEAF LIKE ME) AND YOU SEE A BRILLAINT DISPLAY, ESPECIALLY POTENT METEORS. ! !

RIGHT……I HAVE BEEN BUSY BUILDING A FURTHER VERTICAL AERIAL FOR 143.049….. NOW THAT I HAVE CONDUCTED THESE TESTS WHICH DO SEEM TO CONFIRM THAT GRAVES IS VERTICALLY POLARIZED.

I DIDN’T ATTEMPT ANOTHER 5/8 VERTICAL AS FOR ONE THING I HAVENT GOT THE MATERIAL TO CONSTRUCT ANOTHER……I USED A PRETTY DECENT FISHING ROD TO MAKE THE 5/8 WAVE VERTICAL, AND AS I HAVEN’T GOT ANOTHER ONE I HAD TO…GET MY THINKING CAP ON. !

ONCE AGAIN, I HAD TO SCOUT AROUND TO SEE WHAT I HAD, AS I HAVE NOW GOT VERY LITTLE IN THE WAY OF FISHING ROD AND BITS/BOBS LEFT….SO…..WHAT I HAVE MANAGED TO MAKE IS THE FOLLOWING….A….’SLIM JIM’…..DESIGN…..IT IS A ‘HALF WAVE VERTICAL…CONSTRUCTED FOR 143.049 OF COURSE……….IT DOESNT (OR SHOULDNT) HAVE THE GAIN OF THE 5/8 WAVE, BUT IT WILL CERTAINLY OUT PERFORM A…QUARTER WAVE VERTICAL. LIKE THE 5/8 WAVE, IT IS FAIRLY CRITICAL TO MAKE, BUT NOT QUITE AS CRITICAL AS THE 5/8………..IT DOES HAVE THE ADVANTAGE THAT IT DOES NOT NEED ANY ‘RADIALS’ CONNECTED TO IT……SO THERE ARE THINGS IN ITS FAVOUR.

ANYHOW……THE ACID TEST IS……………DOES IT WORK?

HAVE I MANAGED TO HEAR ANY METEORS ON……143.049. ?

THE SIMPLE ANSWER IS……………..YES IT DOES WORK. !

HAVE I HEARD ANY METEORS/PINGS……………………………….YES I HAVE. !

SO….THERE WE ARE.

LIKE THE 5/8 VERTICAL……..THE HIGHER IT IS UP IN THE AIR……THE BETTER BUT AT JUST 2 POLES HIGH (TEN FEET) I HAVE HEARD METEORS ON MY IC-706 WHILST SITTING OUTSIDE WITH EARPHONES ON.

SO YOU ARE WELCOME TO HAVE SOME FUN YOURSELF THIS WEEK END IN YOUR GARDEN………..YOU WILL DEFINATELY HEAR METEORS/PINGS WITH EITHER……THE 5/8 SHOULD PERFORM BETTER……BUT THE ‘SLIM JIM’ DOES PERFORM WELL TOO, WHEN TESTING FROM MY QTH. REMEMBER THOUGH………….ONLY TUNE TO…….143.049 MHz…… (UPPER SIDE BAND)

AND I RECOMMEND, ONLY USING………..WSJT9 TOO

HAVE FUN

DE…………………..Bill…………………..G4EHT

Detection of meteors by radio scatter from Graves 18/4/2017

HELLO ANDY

WELL, I HAVE DONE FURTHER TESTS AND FOUND THE FOLLOWING

FIRST OF ALL, I AM DELIGHTED TO SAY THAT MY KENWOOD – TH-F7

I HAVE MANAGED TO GET IT TO ‘FINE TUNE’ SO WAS ABLE TO TUNE

IT EXACTLY TO….143.049…..USB

I GOT THE IMPRESSION THAT IT WASN’T AS SENSITIVE AS THE IC-706

ALTHOUGH IT SHOULD BE, AS THE TECHNOLOGY BUILT INTO IT IS

MORE ‘UP TO DATE’ THAN THE IC-706 BY QUITE A FEW YEARS…..

SO, I ADDED MY H/BREW PRE-AMP IN LINE…….AND I AM DELIGHTED

TO SAY THAT I DID RECEIVER A COUPLE OF METEORS/PINGS. !

THIS AGAIN WAS ON…………143.049…….USB

NOW…..THINKING ABOUT USING THE MOXON FOR VERTICAL POLARIZATION..

THIS IS …EASIER SAID THAN DONE ANDY. !!!!!!!!!!!!!!!!

ONCE YOU START DOING THAT THE FOLLOWING HAPPENS…..

BECAUSE YOU WILL THEN HAVE THE AERIAL SUPPORT (METAL MAST)

RIGHT IN LINE WITH THE 2 ELEMENTS, INSTANTLY THE POLAR DIAGRAM OF

THE AERIAL IS DESTROYED. !   THAT’S THE BEAUTY OF USING THE MOXON

(OR ANY YAGI AERIAL) HORIZONTALLY, AS THE METAL MAST SUPPORTING

THE AERIAL DOES NOT AFFECT IT……….HOWEVER, WHEN MOUNTED VERTICALLY

(AS DESCRIBED) THE METAL MAST AFFECTS THE AERIAL TERRIBLY. !

THE ONLY WAY AROUND IT IS THIS…….

THE TOP SUPPORT/MAST MUST BE MADE OF A…NONE METALIC FORM…

EITHER, FIBREGLASS/PLASTIC/WOOD………….OR SIMILAR……IT IS THEN

FINE AND WILL WORK PERFECTLY…….BUT IN PRACTICE, THIS IS VERY

OFTEN, EASIER SAID THAN DONE. !

SO……IF YOU WANT TO USE THE MOXON VERTICALLY…..THIS MUST BE DONE

OTHERWSIE……………FORGET IT……….IT AFFECTS IT THAT BAD.

NOW……….SECONDLY…I HAVE DONE SOME MONITORING THIS MORNING

AND I CAN NOT RESOLVE ANY…..’DATA TRANSMISSION’ WHATEVER FROM GRAVES…

SO I CAN ONLY ASSUME THAT CONDITIONS ARE NOT AS FAVOURABLE TODAY AS

THEY WERE YESTERDAY. ?    I CANT IMAGINE THAT THE DATA TRANSMISSION HEARD

YESTERDAY IS ONLY TRANSMITTED AT CERTAIN TIMES. ?   BUT IT CERTAINLY

WAS NOT DETECTABLE THIS MORNING, BUT I DID RESOLVE A HAND FULL

OF METEORS.

REGARDING MY H/BREW 5/8 VERTICAL………….YES ANDY IF YOU WANT TO TRY IT

THIS WEEK END, THEN THAT’S FINE………….YOU WILL NEED A GOOD LENGTH OF

LOW LOSS 50 OHM FEEDER  ….IT HAS A SO–239   SOCKET FITTED TO IT……

BUT ENSURE THAT YOU CONNECT THE FEEDER CAREFULLY…AND DISCONNECT IT

CAREFULLY AT THE END OF USE…….

IT HAS 2 RADIAL TUNED ELEMENTS FITTED TO IT………….THEY NEED TO FACE DOWNWARDS

IF POSSIBLE, BUT THEY TEND TO LIE IN ABOUT THE CORRECT POSITION ONCE LIFTED

UP IN THE AIR.

NOT MUCH ELSE………….ITS ALL GUD STUFF…

OH YES….FINALLY THE QRG…..

I HAVE NEVER HEARD ANY PINGS/METEORS ON ANYTHING OTHER THAN….143.049   USB

BUT THERE NEEDS TO BE PLENTY OF METEOR ACTIVITY TO CONFIRM ONE WAY

OR THE OTHER.

THE INFO ALWAYS SAYS…..143.049…USB……SO IF THIS WASNT IMPORTANT I FEEL

THEY WOULD SAY OTHERWISE.

HAVE FUN

de……………………Bill………………G4EHT