WELCOME TO MY HOMEBREW PAGE
SOMETIMES ITS GOOD TO TRY A BIT OF HOMEBREW EQUIPMENT
IT PASSES SOME TIME WHEN THE BANDS R DEAD
ITS GOOD FUN AND U LEARN QUICK BELEIVE ME
ON THIS PAGE U WILL FIND SOME INTRESTING THINGS TO TRY
MANY OF THEM I HAVE BUILT AND MOST OF THEM WORKED SO IF I CAN
BUILD IT SO CAN U WITH A LITTLE THOUGHT AND HALF A CLUE HAHA
NEARLY ALL THE STUFF IVE BUILT HAS BEEN BUILT THE DEAD BUG STYLE
&
SOME OF IT HAS BEEN REAL UGLY BUT IT WORKED & U DONT SEE IT
WHEN ITS BOXED IVE EVEN GOT 1 OR 2 BITS THAT ARE NOT EVEN BOXED AND
THEY R STILL WORKING SO GO ON TRY IT
THE FIRST TIME I TRIED ANYTHING IT WAS SHEER LUCK BUT IT WAS QUITE
EASY WHEN I LOOK BACK NOW. ....IT WAS A BEAT FREQUENCY
OSCILLATOR
WHICH U CAN USE ON MOST SHORT WAVE BROADCAST RADIOS AND LISTEN TO
SSB SIGNALS WITHOUT PULLING THE RADIO TO BITS IT JUST SITS BESIDE THE
RADIO IN A SEPERATE BOX OR WHATEVER U LIKE
LOOKS HARD BUT ITS QUITE EASY &WORKS GREAT ON THE NEXT
PROJECT
THIS NEXT PROJECT STARTED WHEN I BOUGHT A SMALL KIT AND BUILT IT
UP AND WAS AMAZED AT THE RESULTS IT WAS THE RAMSEY HR 80 AN 80M
DIRECT CONVERSION RECEIVER AND WITH THE ABOVE PROJECT ADDED TO IT
THEN THE AUDIO OUT CONNECTED TO A SUITABLE AMPLIFIER I COULDNT
BELIEVE MY EARS U WOULDNT BELEIVE THE STATIONS IVE HEARD WITH THAT
LITTLE BOX FROM USA TO AUSTRALIA AND DURING THE DX SEASON [
WINTER TIME] IVE EVEN HEARD N7ML WEST COAST SO WHO NEEDS KENWOOD
EH?
FROM THEN ON IVE BUILT A FEW DIFFRENT BAND MODELS JUST CHOPPING
AND CHANGING BITS HERE AND THERE AND THEY R ALL DEAD BUG STYLE
THE ONLY DOWNFALL WITH DEAD BUG RECEIVERS IS TO TRY TO KEEP ALL
WIRES AS SHORT AS POSSABLE BECAUSE THEY R PRONE TO BREAKTHRU FROM
OTHER BANDS BUT IF U GOT AN A.T.U WELL THIS WILL HELP U CUT MOST OF
IT OUT ...THE ORIGINAL HR80 KIT WORKS WELL WITHOUT AN ATU
HR80DIAG.BMP ...
HR80PARTL.BMP
here a zip file that shows u how 2 build low pwr radio
tranmitter
low pwr
radio transmitter 88-108.zip
homebrew
antenna's
here is some antennas i have
built in the past and present and all have worked
well
i like to play with antenna
s to see if i can squeeze that little bit more signal from
them
first there was the 10m
4element beam made when i was on 11mtr band many years ago
it seemed to be quite good
for directional rxing but never had the chance to transmit as i wasnt
allowed on 10m
and it was a heavy antenna
so only got it 15ft or so up the mast but that was my first and it
inspired me to investigate further about the yagi antenna.. most of
the beams built have been taken from books and fiddled around a
little
a good book on yagi antennas
is THE BEAM ANTENNA HANDBOOK by william orr W6SAI and stuart cowan
W2LX
VERY USEFULL FOR THE
HOMEBREWER
hope u find the info usefull
happy building
10M 4 ELE
YAGI
10M LO 28.6MHZ DESIGN
FREQUENCY
DIR 1 LENGTH ==15 FT 11 INCH
(4.86M )
=====================================
DIR 2 LENGTH==15 FT 11 INCH
( 4.86M )
======================================
DRIVER LENGTH==16 FT 5 INCH
( 5.02M )
==============================================
REFLECTOR LENGTH==16 FT 11
INCH (5.16M )
==========================================================
SPACING FROM REFLECTOR TO
DRIVER ==6 FT 9 INCH ( 2.06M )
SPACING FROM DRIVER TO DIR 2
==8 FT 4 INCH ( 2.57M )
SPACING FROM DIR 2 TO DIR 1
==8 FT 4 INCH ( 2.57M )
TUBING IS 1 INCH DIAM 2.
54CM UNTAPERED
GAIN IS ESTIMATED AT 9.1DB
OVER DIPOLE AND F/B AT 27DB
THIS NEXT ONE IS MY LATEST
MODEL FOR 10M AND FRONT TO BACK HAS BEEN TESTED AND SHOWS
A
MASSIVE 36DB GAIN OVER THE
DIPOLE
MATERIALS FOR THIS COST JUST
UNDER £40 QUID AND FOR THAT PRICE ITS WELL WORTH
PAYING
MIND U I HAVE STILL TO WORK
DX WITH THIS ONE HI HI
10m low
28.6mhz
DIR LENTGH== 15 FT 11 INCH (
4.83M )
======================================
DRIVER LENGTH == 16 FT 7
INCH ( 5.06M )
==================================================
REFLECTOR LENGTH == 17 FT 3
INCH (5.26M )
================================================================
SPACING FROM REFLECTOR TO
DRIVER == 4 FT 9 INCH (1.44M )
SPACING FROM DRIVER TO DIR
==5 FT 2 INCH ( 1.57M )
TUBING BASED FROM THE BOOK
IS 1 INCH (2.54 CM )
BUT MY DESIGN IS MADE FROM
CHEAP CB RADIO DIPOLES SO DIAM IS 1.3CM AND 1CM
+1.6CM
I ALSO MOVED THE DESIGN
FREQUENCY DOWN A LITTLE TO 28.450MHZ
SOME FINE TUNNING WAS NEEDED
BECAUSE THE ELEMENTS ARE TAPERED
REFLECTOR AND DIRECTOR HALF
TUBES ARE CONNECTED TOGETHER WITH 12 INCH OF 1.6CM
TUBE
AND ISOLATED FROM BOOM AND
DRIVER IS JUST SPLIT DIPOLE AND FED WITH BALUN
WORKING ON A BETA MATCH (
HAIRPIN ) SOON
DRIVER ELEMENT WAS ALSO
MOVED BACK TO 1.3M SPACING FROM REFLECTOR FOR BETTER F/B
GAIN
THIS BEAMS DIMENSIONS WERE
PUT TO THE PC AND CHANGED FOR BEST GAIN AND F/B
RATIO
COMPUTER CLAIMS A WHOPPING
F/B OF 43.39DB AND FORWARD GAIN OF 8.10DBI
MY TESTS SHOW A F/B OF 36DB
.....FORWARD GAIN STILL TO BE TESTED
GET THE PROGRAMME FOR
DESIGNING BEAMS
HERE
LOOK FOR 10M3E.INP FOR
GRAPHS OF THIS ANTENNA
