Antenna coils Traps

[G. Lofstead]

If they are Spiro's, send him an Email and ask.  Otherwise, they normally would go out about 2/3 from the center.   I use a trap dipole on 80 & 40 M.  Your traps may go at the 20M dipole end length...  You get a 40 & 20 M dipole...

Been using a trap antenna since the original W3DZZ in teh early 50's.  My original traps just recenltly were replaced with Rayco traps...

Jerry
W3CDE> 
> From: Don Melcher <don at HFRADIO.COM>
> Date: 2006/03/02 Thu PM 09:26:10 EST> To: HEATH at LISTSERV.TEMPE.GOV
> Subject: Re: [HEATH-TEMPE] Antenna coils
> 
> Well - you could dig out the Antenna Book and calculate the inductance (or
> measure it if you have the tools - like maybe a known capacitance and a dip
> meter) and then go from there - but probably somewhere around 1/2 to 2/3 the
> way out - the farther out the loading the better (generally) - but the
> farther out the more inductance needed for the same overall length.
> 
> -----Original Message-----
> From: Heathkit Owners and Collectors List [mailto:HEATH at LISTSERV.TEMPE.GOV]
> On Behalf Of FRED HOLNAGEL> Sent: Thursday, March 02, 2006 1:10 PM
> To: HEATH at LISTSERV.TEMPE.GOV
> Subject: [HEATH-TEMPE] Antenna coils
> 
> Question. I have two antenna shortening coils for 40 meter dipoles. I think
> they were made by Spiro. PVC pipe about 7" long and 1.5" in dia.  They are
> marked in pencil 38 feet overall. Any thoughts as to correct placement in
> the wire elements? Fred W7PRV> 
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