View Single Post
  #9   Report Post  
Old May 28th 05, 10:00 PM
Fred W4JLE
 
Posts: n/a
Default

a 2:1 balun should get you close.

"hasan schiers" wrote in message
...
Thanks Harold, but that's not what I'm trying to do. I'm not trying to
broadband the antenna...I'm trying to simply match it...so that starting

out
at 1:1 instead of 1.7 : 1 will broaden the 2:1 vswr points a bit. I'm

going
to use a tuner on the band edges anyway.

So the only question is:

Simplest way (without caps) to match 29 ohms to 50 ohms at the feedpoint.

...hasan, N0AN

"Harold E. Johnson" wrote in message
news:q1Zle.15771$IC6.11043@attbi_s72...
Well, you can make it a little short and add a base inductor to tap to

get
the high end of the band, or you can make it a little long and shorten

it
with a variable cap.

W4ZCB
"hasan schiers" wrote in message
...
This is a source run for an inverted L antenna for 80m that is 43 feet
vertical and 23 feet horizontal.

What would be the simplest matching network to use to produce a flat

match.
My primary use would be 80m low angle work at 3.7 and 3.5 Mhz, but also

want
to be able to use it (with a tuner, of course) for a local net at 3.97

megs.

While a 1.7:1 vswr at resonance is usable, I would like to get my
starting
point as low as possible to maintain some sort of reasonable vswr at

the
band edges, for those times when I need to check into the net.

By simple I mean no caps...they are not all that easy to find (in a
hurry)
any longer. I need power handling of 500w. My two thoughts are some

sort
of
1/4 wave transformer (although that's a lot of coax), or a simple
toroidal
transformer.

Any suggestions? Core material for the toroid (including availability),
turns ratio, etc? Or is a toroid a bad idea for this app?

TIA,

...hasan, N0AN


EZNEC ver. 3.0

Vertical over real ground 5/28/2005 6:39:29 AM

--------------- SOURCE DATA ---------------

Frequency = 3.71 MHz

Source 1 Voltage = 29.15 V. at 0.61 deg.
Current = 1 A. at 0.0 deg.
Impedance = 29.15 + J 0.308 ohms
Power = 29.15 watts
SWR (50 ohm system) = 1.715 (75 ohm system) = 2.573