[UK-CONTEST] VHF beams

[Mike Chamberlain]

Notes from my lab book tell me that at 50.150 MHz I got a 1.3:1 VSW with my
3 element Moonraker using the following dimensions.

Director: 280cm
Driven Element: 294cm
Reflector: 304cm
Gamma match on director side of driven element
Gamma match to driven element connection at 21cm from boom
Unfortunately I didn't note the boom to outer cylinder on the gamma match
capacitor, but I suspect it was the 7.5cm shown on the assembly
instructions.

I received a 5 element unit from Moonraker yesterday that I'll put together
next week in time for the summer season on 6m.

73
Mike G3WPH



-----Original Message-----
From: uk-contest-bounces at contesting.com
[mailto:uk-contest-bounces at contesting.com] On Behalf Of Alex GM3ZBE
Sent: 08 May 2009 18:47
To: Ian White GM3SEK
Cc: uk-contest at contesting.com
Subject: Re: [UK-CONTEST] VHF beams

It's quite gratifying to hear it wasn't just me!

I suppose what I should really do is get on to Moonraker and see what 
they say, although I have the feeling that would not get me very far.

It rather looks to me like some designed it by computer modelling and 
assumed it would translate to the physical world without any further 
tweaking, such as boom factor correction.  I get the impression the 
whole thing is just too high in frequency.

What is this G8VR - any source of info?
73 es thanks for the responses.
Alex

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