[Elecraft] [K3S] WSPR "Receiver Noise Level"

[Fred Jensen]

Yep, totally true.  Same problem/effect as when someone uses way more 
power than needed on a satellite transponder.  Just be careful of your 
ears.  At 2.7 KHz [widest roofer I have], I never encountered a really 
strong signal in the passband that I could hear, in the fairly short 
time I was using JT-65.  One approach from "way back in radio" is to 
wear your headphones somewhat forward on your head when in these AGC-off 
modes.  CONFIG:AF LIM ON is also a really good idea.

73,

Fred K6DGW
- Sparks NV DM09dn

- Northern California Contest Club
- CU in the Cal QSO Party 7-8 Oct 2017
- www.cqp.org

On 11/27/2016 5:47 PM, Bob wrote:
> Well, everyone is different I suppose, but I believe the intent of
> WSJT-X and the JT65/JT9 modes is to open your RX filter wide, to 4 KHz.
> That lets you see every JT65 AND JT9 signal in the bandpass.  If you
> narrow down the filter you will miss many of the signals.
>
> Because of the wide bandwidth, you really need to turn your AGC OFF.
> This will prevent a strong signal somewhere in the passband from
> suppressing the RX gain to the point that weak signals are missed.  Turn
> your RF gain fully CCW, then turn the AGC OFF.  Then advance the RX gain
> until you see about "30" on the WSJT-x meter (left side - per the
> manual).  I drive my interface off the line output, so the AF setting in
> not material.
>
> When done this way, it is very common to decode 20 or more signals per
> pass on 20 meters.  And it is fairly easy to have DXCC within a couple
> of weeks, especially if you use JT-Alert too.
>
> Good luck!
>
> Bob, WB4SON