While it is true that, for a station receiving via skywave on the HF
bands, the path loss will usually drive the noise from a Flex TX below
the distant stations noise floor, let us not forget those within range
of the ground wave.
For those, the noise from a Flex at 100w, at -77 dBc (which is -27
dBm), can be quite substantial. Recall that S9 is approx -72 dBm. A
Flex is transmitting wideband S9+45 noise.
I would think that a Flex would be absolutely intolerable for any
event involving nearby stations, such as Field Day.
And I would think anyone running a Flex who happens to have neighbors
within a few miles would not be a popular fellow.
73 de dave
ab9ca/4
On 12/31/13 12:57 PM, Bruce Beford wrote:
Many people seem to be either forgetting, or missing the point of Leif's
article (referenced below). The entire thrust was in the context of using an
HF transceiver as an IF rig with VHF/UHF/SHF transverters. Band noise on
those higher freqs is low enough that transmitted phase noise can be an
issue. This is especially true when running high power.
His summation was that the Flex-1500 is marketed as being perfect for
driving microwave transverters. His article outlines why this may not be
true. The FLEX SDR radios are not as objectionable on the HF bands, where
atmospheric and other noise dominates.
Bruce, N1RX
Based upon the published test results I've seen, if
everyone used FLEX SDR rigs nobody would enjoy SDR rigs ... or any
other rigs for that matter. Check out
http://www.sm5bsz.com/dynrange/dubus313.pdf for the details.
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