开云体育

What is ERP -- earned run potential?

-- Bil

----- Original Message -----
From: KQ6XA <xtalradio@...>
To: <FT817@...>
Sent: Thursday, May 31, 2001 6:34 PM
Subject: [FT817] Rules of Thumb: HF Portable Power/Antennas

Relative Scale of Approximate Power and S-Meter Signal Strength
For Various SSB Transmitting Systems at Low Takeoff Angles on 14MHz
(HF-DX)

S9: 1kW + beam = 4kW ERP
S8: 1kW + dipole = 1kW ERP
S7: 100W + beam = 400W ERP
S6: 50W + beam = 200W ERP
S6: 100W + dipole = 100W ERP
S5: 50W + high dipole = 50W ERP
S5: 12W + beam = 50W ERP
S4: 50W + low dipole = 25W ERP
S4: 12W + high dipole = 12W ERP
S3: 12W + low dipole = 3W ERP
S3: 50W + backpack whip = 12W ERP
S2: 5W + high dipole = 5W ERP
S2: 12W + backpack whip = 3W ERP
S1: 2.5W + high dipole = 2.5W ERP
S1: 5W + low dipole = 2.5W ERP
S1: 5W + backpack whip = ~1W ERP
S0: 2.5W + low dipole = ~1W ERP
S0: 2.5W + backpack whip = ~600mW ERP


NOTE: Comparison is approximate, based upon about 6dB for each

S-Unit,

and starting with a kilowatt into a 6dB gain triband yagi. Low

dipole

is considered to be about 3dB loss, and a loaded backpack whip is
considered to be about 6dB loss as compared to a high dipole.
Source: KQ6XA

73---Bonnie KQ6XA




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