You are correct. The towers were about 400'. When I converted meters to feet, I entered the wrong number. My wrong.
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WWVA towers on the ground
- Thread starter wgliradio
- Start date
TomT said:
The emergency antenna uses a 150' horizontal loading wire from the
50' stub of one of the towers to another tower stub, from which
it is insulated. A NEC model of that system shows this, FWIW:
The model used 1/2" OD wires, did not include the remaining stubs of the
other two towers, and assumed the total of the loss in the connection to r-f
ground plus the loss in the matching network to be 3 ohms. The feedpoint
terminals are the bottom of the 50' vertical wire and r-f ground.
- The vertically-polarized far-field radiation pattern is omnidirectional
with a max gain of 2.33 dBi (including the 3 dB reflection from a
perfect earth)
- The inverse distance field at 1 km for 1 kW of applied power for those
conditions is 232 mV/m (518 mV/m for 5 kW)
The IDF of this configuration is "only" about 2.7 dB below that of a
perfect, unloaded 1/4-wave monopole with a zero-ohm connection
to a perfect ground plane.
//
Is it day & night with these facilities?
I would think that based on what other stations have done, my guess is that it would run about 10 kW day and night. But just now I see that a previous post says it's 5 kW.
The maximum that they can run non-directional at night under STA would be 12.5 kW, 25% of their directional night power. From what I'm hearing, they'll get there once they get a temporary guyed tower erected. In the meantime, 5 kW is about as much as the lashed-up inverted L antenna can handle.
I'm not sure whether they'll run a full 50 ND into the temporary stick during the day.
No STA request has been filed yet, at least nothing that shows on CDBS, though they may well have received a verbal STA from staff that will be followed up with a more formal STA request this week.
I'm not sure whether they'll run a full 50 ND into the temporary stick during the day.
No STA request has been filed yet, at least nothing that shows on CDBS, though they may well have received a verbal STA from staff that will be followed up with a more formal STA request this week.
I'm presently hearing a religious talk program on 1170 presumably WWVA with a ~2 Hz heterodyne of approximately the same amplitude that doesn't seem to be modulated. Also IBOC hiss fading in and out from presumably WHAM on 1180.
As I recall, I'm outside the 0.5 mV/m 50% Skywave Contour of WWVA with the newfangled geomagnetic midpoint latitude skywave prediction, somewhat off the back but still in the protected skywave azimuth part of the pattern. I don't think WYLL or the Covington, Kentucky area station on 1160 are IBOC. Probably a daytime station forgot to turn off the carrier on 1170.
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