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[Linrad] Linrad/sdr-IQ level adkustement?
- Subject: [Linrad] Linrad/sdr-IQ level adkustement?
- From: "f6dro" <wanadoo.fr; f6dro@xxxxxxxxxxxxxxxx>
- Date: Sun, 8 Mar 2009 16:46:54 +0100
I ran some experiments yesterday and this morning , and I have dumb
1) I 1st verified that the hardware really sets the noise floor. No pb I get
18db noise floor increase when the preamplifier is switched off.
To know more , I also checked whats going on when I switch the SDR-IQ input
attenuator : the preampON/preamp OFF ratio immediately goes on the low
Same test with the SDR-IQ IF gain : even with gain set to0db , preamp noise
ratio stays 18 db.
2) Check levels on Winrad :
There was a contest this w.e , with the original settings , I got heavy
saturation on a local friend on Linrad , when my normal rig behaved OK
(TS850+tvter). So probably my level is too high.The S meter is at S9+10 with
red color on the noise level , I suppose it is not good at all?
Question : the only way to get the rigth without killing sensitivity is to
play with the IF SDR-IQ attenuator , I'm not sure the gain box ( associated
with SDR-IQ QRG setting) is effective on the IF gain , someone could confirm
pse?On which gain is this control effective?
If it is not the case , where can I set this? ( Maybe one of the parameters
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