thanks for all the help, I'll start researching an impedance matching
transformer for my setup, I guess I'll probably need to wind a balun to
match the antenna and coax


"Richard Harrison" wrote in message
...
Jeff Dieterlle wrote:
"I ran RG 6-U coax to the roof of the factory (approx. 100 ft) and
considered buying a loop antenna but at this group`s suggestion
connected the coax to the long wire. The stations I`m interested in are
Indianapolis 1070 kc and Chicago 670 kc & 1000 kc. I installed 200 ft of
#12 ga insulated wire that is oriented in line with these 2 cities
and....."

Jeff didn`t say how far he is from the stations. All 3 stations run 50
KW but have daytime directional patterns which may affect the signal
strength he receives.

50 KW nondirectional can produce 1860 millivolts per meter at one mile
or 9.3 millivolts at 200 miles. I said may because it depends on ground
conductiviyty and other factors. I listen to to a 50 KW station 200
miles away 24 hours.

RG-6 has a capacitnance of 20.5pF/ft. So, 100 ft. totals 2050 pF. At
1000 KHz, its reactance is about 78 ohms. This is shunting the impedance
of 61 meters of 12 gauge wire (0.0033 WL), a fairly figh capacitive
reactance at 1000 KHz. This is a voltage divider. Most of the energy
captured by the wire is dropped scross the wire and reradiated never
reaching the receiver. That was why a loop which matched the coax was
suggested.. Jeff pribably gets enough signal in his antenna. He might
get more of it to his receiver using a broadband transformer between his
antenna and coax which stepped doown the impedance to match the coax
approximately. He may need to step it back up at the receiver end. I
recall using this arrangement in 1938 with a General Electric all-band
doublet kit and it worked well.

Pointing the wire at the station is fine for a Beverage antenna but
about 2 wavelengths is needed for a Beverage.. That wold be 1968 feet at
1000 KHz. The Beverage is vertically polarized, as needed to receive a
ground wave. Otherwise, shorter antennas may do better at a more
broadside attitude towards the signal wavefront. A random wire generally
uses its vertical component to receive groundwaves.

Best regards, Richard Harriison, KB5WZI