>From c74f3603e3f0b03d3f41567fea3aa5a756e933ef Mon Sep 17 00:00:00 2001
From: Alexander Kurpiers <[email protected]>
Date: Thu, 9 Jan 2014 20:35:03 +0100
Subject: [PATCH 5/7] E4000 data sheet gain values are a bit off
LNA gain of 30dB seems to be 25dB instead (error in data sheet)?
Low mixer gain is more 5dB than 4dB.
Correct small error for -25dB in "linearity" mode.
---
src/tuner_e4k.c | 32 +++++++++++++++++---------------
1 file changed, 17 insertions(+), 15 deletions(-)
diff --git a/src/tuner_e4k.c b/src/tuner_e4k.c
index 27b44ad..4302fa8 100644
--- a/src/tuner_e4k.c
+++ b/src/tuner_e4k.c
@@ -687,10 +687,12 @@ static const struct gain_table_mode_struct {
int32_t LNA_gain;
int32_t mixer_gain;
int32_t IF_gain[6];
+ /* data sheet seems wrong, LNA gain "30dB" is 25dB and mixer gain
+ 4dB is more 5dB */
} gain_table_mode_linearity[] = { /* LNA Mixer IF Total */
- -250, -5, 4, { -3, 0, 0, 0, 9, 6}, /* -5 4 12 9 */
- -200, -5, 4, { -3, 0, 0, 1, 12, 9}, /* -5 4 19 18 */
- -150, -5, 4, { -3, 6, 0, 0, 12, 9}, /* -5 4 24 23 */
+ -250, -5, 4, { -3, 0, 0, 2, 9, 6}, /* -5 5 12 14 */
+ -200, -5, 4, { -3, 0, 0, 1, 12, 9}, /* -5 5 19 19 */
+ -150, -5, 4, { -3, 6, 0, 0, 12, 9}, /* -5 5 24 24 */
-100, -5, 12, { -3, 3, 0, 1, 12, 9}, /* -5 12 22 29 */
-50, -5, 12, { -3, 6, 0, 0, 12, 12}, /* -5 12 27 34 */
0, 0, 12, { -3, 6, 0, 0, 12, 12}, /* 0 12 27 39 */
@@ -698,20 +700,20 @@ static const struct gain_table_mode_struct {
100, 10, 12, { -3, 6, 0, 0, 12, 12}, /* 10 12 27 49 */
150, 15, 12, { -3, 6, 0, 0, 12, 12}, /* 15 12 27 54 */
200, 20, 12, { -3, 6, 0, 0, 12, 12}, /* 20 12 27 59 */
- 250, 30, 12, { -3, 6, 0, 0, 12, 12}, /* 30 12 27 69 */
+ 250, 30, 12, { -3, 6, 0, 0, 12, 12}, /* 25 12 27 64 */
},
gain_table_mode_sensitivity[] = { /* LNA Mixer IF Total */
- -250, 5, 4, { -3, 0, 0, 1, 6, 3}, /* 5 4 7 16 */
- -200, 10, 4, { -3, 0, 0, 1, 6, 3}, /* 10 4 7 21 */
- -150, 15, 4, { -3, 0, 0, 1, 6, 3}, /* 15 4 7 26 */
- -100, 20, 4, { -3, 0, 0, 1, 6, 3}, /* 20 4 7 31 */
- -50, 30, 4, { -3, 0, 0, 1, 6, 3}, /* 30 4 7 41 */
- 0, 30, 12, { -3, 0, 0, 2, 3, 3}, /* 30 12 5 47 */
- 50, 30, 12, { -3, 3, 0, 1, 6, 3}, /* 30 12 10 52 */
- 100, 30, 12, { 6, 0, 0, 0, 6, 3}, /* 30 12 15 57 */
- 150, 30, 12, { 6, 0, 0, 2, 9, 3}, /* 30 12 20 62 */
- 200, 30, 12, { 6, 3, 0, 1, 9, 6}, /* 30 12 25 67 */
- 250, 30, 12, { 6, 6, 0, 0, 9, 9}, /* 30 12 30 72 */
+ -250, 5, 4, { -3, 0, 0, 1, 6, 3}, /* 5 5 7 17 */
+ -200, 10, 4, { -3, 0, 0, 1, 6, 3}, /* 10 5 7 22 */
+ -150, 15, 4, { -3, 0, 0, 1, 6, 3}, /* 15 5 7 27 */
+ -100, 20, 4, { -3, 0, 0, 1, 6, 3}, /* 20 5 7 32 */
+ -50, 30, 4, { -3, 0, 0, 1, 6, 3}, /* 25 5 7 37 */
+ 0, 30, 12, { -3, 0, 0, 2, 3, 3}, /* 25 12 5 42 */
+ 50, 30, 12, { -3, 3, 0, 1, 6, 3}, /* 25 12 10 47 */
+ 100, 30, 12, { 6, 0, 0, 0, 6, 3}, /* 25 12 15 52 */
+ 150, 30, 12, { 6, 0, 0, 2, 9, 3}, /* 25 12 20 57 */
+ 200, 30, 12, { 6, 3, 0, 1, 9, 6}, /* 25 12 25 62 */
+ 250, 30, 12, { 6, 6, 0, 0, 9, 9}, /* 25 12 30 67 */
};
int e4k_set_lna_mixer_if_gain(struct e4k_state *e4k, int32_t gain)
--
1.7.9.5
