Fw: Fw: Re: [Antennas] 450 Ohm Ladder Line
Cletus W Whitaker
[email protected]
2002年12月13日 16:36:20 -0500
de WB2CPN South Central Pennsylvania 2002年12月13日
First, way back then the BC-779 Super Pro and the SX-28 both
had adjustable S-Meters. Way back then a calibrated signal
source was unknown in the field, so they were usually set
to where they didn't bang the pin, or all set to the same
reading from a local signal.
Second, I've used 200-Ohm twin lead in the USAF at the end of
WWII, and up through the mid-50's. The highest quality
transmission lines for large receive rhombics was a 4-wire
open-wire line supported on poles. Diagonal wires were tied
together, and the overall Impedance was 200 Ohms. The twin
lead was very heavy, and was used to run the lines from the
poles outside the receiver building to the receiver patch
bay. The BC-779 and its replacement had balanced inputs.
Does anyone know what the replacement for the BC-779 was?
It came before the SP-600 series. It looked somewhat like
a BC-779, but had a crystal bank. 73 Clete