[Amps] new amp race / antenna take-off angle

[Jim Thomson]

-----Original Message----- 
From: Leigh Turner
Sent: Tuesday, May 23, 2017 8:37 PM
To: 'Jim Thomson'
Cc: 'AMPS' ; leigh.turner at ieee.org
Subject: RE: [Amps] new amp race / antenna take-off angle


<Hi Jim,

If folk want to learn how to work the world on 160m top band DX from a
suburban block and cleverly work-around any perceived antenna height and
size restrictions then I recommend a careful read of Steve's VK5SFA very
informative website:

http://members.iinet.net.au/~sadler@netspace.net.au/

http://members.iinet.net.au/~sadler@netspace.net.au/tmla.html

A detailed eyebrow raising keynote presentation of this remarkable 160m/80m
TMLA was given at a technical symposium held at the annual WIA AGM last
weekend here in Adelaide. The session was augmented the following day with
live field demonstrations of its on-air performance and auto-tune features.

Steve's impressive 160m logbook of DX contacts racked up for the past year
of deploying this novel antenna is the envy of everybody here in VK land
including the sceptical diehard topband aficionados.

This is a prime example of the application of a bit of ingenuity for which
the amateur radio community are renowned for...to the contrary Jim, rather
than being doomed to failure as you incorrectly assert one can instead
experience rewarding nirvana!

The small footprint TMLA works because it's radiating useful power down at a
low angle to enable long-haul DX propagation path circuits. On Rx it also
exhibits an exemplary SNR in an urban/suburban environment in respect to
man-made noise rejection.

73

Leigh
VK5KLT

##  Excellent info leigh.    87 Amps of RF current with just 400 watts 
applied, and
only a BW of just 4 khz on 160M, ...and 8 khz on 80m, would limit max power 
that could be
employed.    Still, it would work good on RX..which is where folks like me
have a helluva time hearing on 160M.    If it was used as an RX ant only, 
the vac cap
could be either still used..or replaced with something else.   Or a smaller 
vac cap, but
padded....would also work good.   Air core heliax, or perhaps  1.125 cu 
tubing could be used,
or 1 to 1.5 inch OD soft drawn al tubing, like  3003 alloy, in H0.

##  Steve used  2 loops.  Can 3 or more be used ?

Jim   VE7RF