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

Leave a Reply