[600MRG] 630m background noise

[John Langridge]

Dave, my best 472 rx antenna here is similar in design to what you
describe, but 12 -14 turns on 7 foot spreaders in a square
configuration and a separate pickup loop about 2 inches from the
resonated turns.  I also step up the low impedance to the 50 ohms feed
line with a small binoc transformer..  This setup has been the winner
for years now here.

anyway, when noise sources are in the null. I usually see S0 to S1
band noise here.  Signals seem to jump out when propagation is
reasonable in spite of low S meter readings.  They sound good and
that's all I care about.

so if I am interpreting your comments accurately you are seeing about
1 S unit of noise which is roughly what I see here.

Hope that helps,

73!

John..


On 1/30/23, Dave Riley via 600MRG <600mrg at mailman.qth.net> wrote:
> The current loop antenna here for 630m is 5 turns of #14 wire, resonated
> and not shielded in a 5' dia.
>
> It out performs previous antennas here so far.
>
> With a 50 ohm load connected to the receiver input I set the audio out (
> no agc ) to 0 db
>
> Replacing the load with the loop antenna I get + 7 db of noise with no
> signals
>
> Is this about average for 475 khz?? Does anyone know what to expect at
> these frequencies??
>
> Dave/W1FRV
>
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