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#4
May 28th 05, 01:36 PM
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"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 |
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