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disable e4k enhanced mixer gain as it seems to have no effect

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This commit is contained in:
Dimitri Stolnikov 2012-08-05 16:35:47 +02:00
parent 88cd4b33cf
commit b49a8336ee
1 changed files with 7 additions and 2 deletions
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9
src/librtlsdr.c
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@ -106,14 +106,18 @@ int e4000_set_bw(void *dev, int bw) {
int e4000_set_gain(void *dev, int gain) {
rtlsdr_dev_t* devt = (rtlsdr_dev_t*)dev;
int mixgain = (gain > 340) ? 12 : 4;
#if 0
int enhgain = (gain - 420);
if(e4k_set_lna_gain(&devt->e4k_s, min(300, gain - 40)) == -EINVAL)
#endif
if(e4k_set_lna_gain(&devt->e4k_s, min(300, gain - mixgain * 10)) == -EINVAL)
return -1;
if(e4k_mixer_gain_set(&devt->e4k_s, mixgain) == -EINVAL)
return -1;
#if 0 /* enhanced mixer gain seems to have no effect */
if(enhgain >= 0)
if(e4k_set_enh_gain(&devt->e4k_s, enhgain) == -EINVAL)
return -1;
#endif
return 0;
}
int e4000_set_if_gain(void *dev, int stage, int gain) {
@ -702,8 +706,9 @@ enum rtlsdr_tuner rtlsdr_get_tuner_type(rtlsdr_dev_t *dev)
int rtlsdr_get_tuner_gains(rtlsdr_dev_t *dev, int *gains)
{
/* all gain values are expressed in tenths of a dB */
const int e4k_gains[] = { -10, 15, 40, 65, 90, 115, 140, 165, 190, 215,
240, 290, 340, 420, 430, 450, 470, 490 };
240, 290, 340, 420 };
const int fc0012_gains[] = { -99, -40, 71, 179, 192 };
const int fc0013_gains[] = { -63, 71, 191, 197 };
const int fc2580_gains[] = { 0 /* no gain values */ };