On Wed, May 08, 2013 at 03:19:30PM +0200, Zoran Turalija wrote:
> This makes minimum symbol rate driver capabilities on par with
> windows driver, and allows tuning on linux to transponders that
> have symbol rate below 5000000, too.
Looks like product datasheets for tuners containing STB0899 are
suggesting specification for min. symbol rate of 2MS/s.
Some specs found here, all suggesting 2MS/s for min. symbol rate:
Comtech DVBS2-6899
http://comtech.sg1002.myweb.hinet.net/pdf/dvbs2-6899.pdf
TechniSat SkyStar HD2
http://www.scaistar.com/skystar2/skystarhd2.htm
Azurewave AD-SP400
http://www.pulsat.com/products/AzureWave-AD%252dSP400-High-Definition-PC-Card.html
New patch attached.
--
Kind regards,
Zoran Turalija
>From 9cd352d8cdcdac7e63064ec2ed0e05e1e446d1ea Mon Sep 17 00:00:00 2001
From: Zoran Turalija <zoran.turalija@xxxxxxxxx>
Date: Wed, 8 May 2013 13:50:36 +0200
Subject: [PATCH] [media] stb0899: allow minimum symbol rate of 2MS/s
This makes minimum symbol rate driver capabilities on par with some
accessible datasheet specifications*, and allows tuning on linux to
transponders that have symbol rate between 2000000-5000000, too.
Patch was tested successfully on Eutelsat 16A transponders that
became reachable with it (2000000 < symbol rate < 5000000):
* DVB/S 12507050 V 2532000 3/4
* DVB/S2 12574000 V 4355000 3/4 8PSK
* DVB/S 12593000 V 2500000 2/3
* DVB/S 12596940 V 2848000 2/3
* DVB/S 12600750 V 2500000 1/2
* DVB/S 12675590 H 4248000 3/4
(*) Datasheet: http://comtech.sg1002.myweb.hinet.net/pdf/dvbs2-6899.pdf
Maximum Symbol Rate
QPSK/LDPC/PCH: 20-30Mbps
8PSK/LDPC/BCH: 10-30Mbps
DVB: 2-45Mbps
^--------- min. symbol rate
Signed-off-by: Zoran Turalija <zoran.turalija@xxxxxxxxx>
---
stb0899_drv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/stb0899_drv.c b/stb0899_drv.c
index cc278b3..b3ccd3d 100644
--- a/stb0899_drv.c
+++ b/stb0899_drv.c
@@ -1581,7 +1581,7 @@ static struct dvb_frontend_ops stb0899_ops = {
.frequency_max = 2150000,
.frequency_stepsize = 0,
.frequency_tolerance = 0,
- .symbol_rate_min = 5000000,
+ .symbol_rate_min = 2000000,
.symbol_rate_max = 45000000,
.caps = FE_CAN_INVERSION_AUTO |
--
1.8.1.2
