[Milsurplus] Forest Service SPF radio detail (Windom)

[k2cby at optonline.net]

When I started out in this game some 60 years ago the 2-wire-fed Windom was
fairly common among operators who wanted multi-band operation on a budget.
The two wire feedlines in those days were 300-Ohm television twin-lead (or
300 Ohm open wire if you could find it) , and they were coupled to the
transmitter with a Heathkit 75 Ohm to 300 Ohm balun coil and a length of
RG-11 coax. This leads me to believe that the characteristic of the Windom
antenna was somewhere around 300 Ohms. That was my Novice setup running a
Heathkit DX-40.

Single wire feed would seem to be another matter entirely because it works
against ground. As such, the actual impedance at the transmitter end not
only depends on the antenna impedance but also on the impedance of the
ground connection - i.e., length, number and size of the counterpoise
wire(s) as well as the integrity of the connections. In other words, it's
anybody's guess! 

 

Miles B. Anderson, K2CBY
16 Round Pond Lane
Sag Harbor, New York 11963-3821
Phone: (631) 725-4400
FAX: (631) 725-2223

e-mail: k2cby at optimum.net

 

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