[Elecraft] KX3 "Full" SDR

[dave]

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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