Comments for Reflection Technology

Comment on VP2E offcentre-fed fullwave inverted-V antenna by John Rowlands

John Rowlands — Sat, 01 Dec 2012 22:02:54 +0000

Well done on spotting this one! It’s actually included as a model in the latest MMANA-GAL. Lower the lowest point of the antenna and the pattern changes a bit whilst the gain goes up to a very respectable 4+dBi. That, and the angle of radiation seems hardly affected by low end-points for the antenna, at least for my ground conditions, which are the best land-based conditions you will find.

I then started wondering: wouldn’t a half-loop for 40m (my band of interest) be just as good or better? I’ll have to check that, too!

Comment on VP2E offcentre-fed fullwave inverted-V antenna by Rich - KF9F

Rich - KF9F — Wed, 19 Sep 2012 17:36:12 +0000

NICE INFO & REFERENCE.
CURIOUS AS TO THE TERMINATING RESESTANCE YOU REFER TO IN MILITARY VERSION.
HERE A GOOD NUMBER OF GUYS WANTING NVIS & OTHER CAPABILITY,
WONDERED IF THIS ONE WOULDN’T MAKE A GOOD CHOICE FOR THAT.
I HAVE A “SPENCER” DIPOLE IN AN OCF CONFIGURATION, SEEMS
TO WORK VERY WELL 160 – 10.
REGARDS
RICH
KF9F

Comment on VP2E offcentre-fed fullwave inverted-V antenna by Dr Don Sanders

Dr Don Sanders — Sun, 16 Sep 2012 12:25:14 +0000

This antenna is similar to others that have been documented in several texts.
Basically a 1 wave length , fed 1/4 wave from one end, usable for NVIS and portable use.
The US Military has a similar ant in their antenna handbook, also similar with a terminating load at the opposite end from the feed and a ground mounted wire return from one end to the other making a loop. Again intended foir NVIS comms useage.

It can also be viewed as two halfwaves in phase current fed.

Comment on VK5JST Antenna Analyser by dave

dave — Tue, 22 Apr 2008 08:49:29 +0000

I’ve just finished the Aerial analyser and I can tell you it works, very well .although I do miss the analogue meters of a MFJ .
It is a lot cheaper and works just as well if not better than the MFJ259 .I used a larger LCD module as my arms are not long enougjh these days to focus,

Comment on VK5JST Antenna Analyser by dave

dave — Sat, 15 Mar 2008 09:15:19 +0000

Hi , I’ve got all the components now , i’ve opted for a bigger LCD screen .I did find a source of the tuning wheel. an asprin pill container top ,cut down ,works well.
got some help with the software statments, it now boots up Dave GM3WIL, it is all starting to work now …really chuffed .
Dave

Comment on VK5JST Antenna Analyser by dave

dave — Wed, 05 Mar 2008 17:20:50 +0000

Giovanni, I haven’t got my LCD yet and I’m short of transistors the PN3563 and the monolithic decoupling capacitors I also need the little wheel for the variable capacitor ,don’t know where I’ll get one.
I’m really keen to try it all out I’ve even tried to put my Callsign in it might even work.
I will just need to wait.I’m not kit building, it is all from scratch.
I have used ribbon cable on the PCB side and that should allow mw to move it to where It looks best

I have other projects like the ARDF 80 Metre Transmitter qrp 4 watt TX
This is the second one I’ve made I need to built a small ATU inside it
I thought a loading coil and a Parrallel 300 pF capacitor to ground so It will tune a 4 metre length of wire
73 Dave

Comment on VK5JST Antenna Analyser by Giovanni

Giovanni — Wed, 05 Mar 2008 05:20:23 +0000

Dave – It also reported half the memory empty (left) when I upload new versions so it all sounds good.

Does the display show anything sensible?

I hadn’t realised before I assembled it that the little row of wires from the LCD to the main board is a tight fit. I was going to put sockets and use ribbon cable but the 1cm long (or thereabouts) row of wires provide quite firm support for the display.

Comment on VK5JST Antenna Analyser by dave

dave — Mon, 03 Mar 2008 22:47:39 +0000

Ok Giovanni, I also want to use a bigger LCD screen as my arms are not long enough these days to see small sceens, I’ve loaded the sofware ,but I don’t know if it is OK it reports back that about half the memory is used.
I used the send option on the programme to put the prog in
Dave

Comment on VK5JST Antenna Analyser by Giovanni

Giovanni — Mon, 03 Mar 2008 19:28:41 +0000

Thanks for the tip about CD sound cables – I have several and they’re easy to get – visit your local PC Store.

About programming with the unit only partially built – personally I wouldn’t. Get it going as supplied, otherwise if it doesn’t go you don’t know whether the programming didn’t go well or what.

You can find the 28X1 on the View Menu/Options/Mode Tab.

Comment on VK5JST Antenna Analyser by dave

dave — Sun, 02 Mar 2008 20:14:01 +0000

I just discoved that I could use a computor sound cable for a CD player fits perfectlty on to the PCB serial interface