 | |  |
| |||||||
Would a DiSEqC motor have any effect on the signal quality?Information exchange on LNBs, Single satellite, motorised and multi-satellite systems. DiSEqC switches, positioners, motors, actuators, dish-alignment etc. | |
 |
| | LinkBack | Thread Tools | Display Modes |
23-05-2009
| #1 | ||
| Regular Member Join Date: 15-09-2006 Location: Sweden
Posts: 78
Thanks: 4
Thanked 1 Time in 1 Post
My System: Zehnder DR600 digital receiver, 90cm Amstrad dish and one MTI Blue Line 0,2db LNB. |
Hello, I'll give Astra 2D a try from Sweden soon, but I'm also thinking about getting a motor so I can also use the same dish for the scandinavian Thor sats at 0.8°W. Do you think a motor (correctly setup) would in any way worsen my chanses of getting Astra 2D? Regards Oskar | ||
|  |
|
23-05-2009
| #2 | ||
| Amo Amas Amant Admin  Join Date: 18-11-2004 Location: Blackburn NW England (Siberia)
Posts: 11284
Thanks: 24
Thanked 506 Times in 465 Posts
My System: IDD CI24 ECONO MM Penta 1.20 Galaxy II 1.2Mtr Polar MTG yes it has been on the arc for 21 years and is still driven by a modified wiper motor from a Ford Anglia. It's like me sometimes groans but always performs  Saved us from the black plague of ignoratio elenchi, he awaits a special badge with jugs |
Any interruption to the signal path along the cable by insertion of a device will lose you quality depending on the rated signal loss for that device. So in answer to your question I would have to say yes | ||
| War does not determine who is right, it determines who is left! Formerly toppervte33h whose six pack has turned into a keg Help support this web site by making a donation Or use other options to help support Sats UK Show Your Support by clicking the button  Thank you. Freddie Flintoff is back | |||
|
| |
|
23-05-2009
| #3 | ||
| Super Moderator  Real name: Mark Join Date: 17-05-2007 Location: Kent,UK
Posts: 4493
Thanks: 76
Thanked 632 Times in 600 Posts
My System: TM6800HD, TM1000, TM600 Linux,TM5200, TM2200 motor, Triax TD110 dish + Fortec 85cm. Meter=Satlook Micro+G2 NIT | The attenuation in the motor will be minimal, something like approx equivalent to 10m of cable. The attenuation should not affect the SNR as long as the signal level is adequate to start with. Thus I would say, as long as you don't have an exessively long cable run, the signal quality should be unnafected by the motor. | ||
| | |||
|
| |
|
23-05-2009
| #4 | ||
| Super Moderator  Real name: Paul Join Date: 07-05-2007 Location: South Midlands, UK & Lanzarote, Canary Islands
Posts: 4386
Thanks: 24
Thanked 542 Times in 478 Posts
My System: Zone1, DSI8215 SkyHD, Thomson DSI4214, TF5000CI, Dreambox DM800 HD PVR - Nab BH0.12, TM-5200D, Gibertini 104cm, SNH-031, 36v Actuator, Vbox-II, 42°E to 30°W, Sling Media, Televes H45 Digital Processing Analyser, Satlook Micro+G2 NIT, Rover SDM 1s | As long as the MER/CNR is maintained, you should be ok. The signal loss on a DiSEqC motor is around 2dB, maybe more at 2GHz. | ||
| | |||
| |
|
23-05-2009
| #5 | ||
| Regular Member Join Date: 15-09-2006 Location: Sweden
Posts: 78
Thanks: 4
Thanked 1 Time in 1 Post
My System: Zehnder DR600 digital receiver, 90cm Amstrad dish and one MTI Blue Line 0,2db LNB. | Hello, OK thanks. The cable isn't very long, about 10 meters in total I think. The LNB I'll use will be suited for bad reception since the Astra 2D reception is very weak in Sweden. However, the reception from Thor is very strong. Could that be a problem for the LNB? Also, the dish is a 110 cm with 42,0 gain at 12,75 Ghz (dBi), does that figure (dbi) has anything to do with your figure of 2 dB signal loss? Regards Oskar | ||
|
| |
|
23-05-2009
| #6 | ||
| Super Moderator Real name: Mark Join Date: 17-05-2007 Location: Kent,UK
Posts: 4493
Thanks: 76
Thanked 632 Times in 600 Posts
My System: TM6800HD, TM1000, TM600 Linux,TM5200, TM2200 motor, Triax TD110 dish + Fortec 85cm. Meter=Satlook Micro+G2 NIT | No, the lnb will cope fine. We have a similar situation here with 28E and 7W. 28E is very strong, 7W very weak. The gain of the dish mainly affects the SNR from the satellite, the LNB then provides amplification to cover cable losses. | ||
| | |||
|
| |
|
23-05-2009
| #7 | |||
| Super Moderator Real name: Paul Join Date: 07-05-2007 Location: South Midlands, UK & Lanzarote, Canary Islands
Posts: 4386
Thanks: 24
Thanked 542 Times in 478 Posts
My System: Zone1, DSI8215 SkyHD, Thomson DSI4214, TF5000CI, Dreambox DM800 HD PVR - Nab BH0.12, TM-5200D, Gibertini 104cm, SNH-031, 36v Actuator, Vbox-II, 42°E to 30°W, Sling Media, Televes H45 Digital Processing Analyser, Satlook Micro+G2 NIT, Rover SDM 1s |
Dish gain is quoted as dBi (dBi isotropic). Signal loss or gain at satellite 'IF' intermediate frequency is measured in dBuV. | |||
| | ||||
|
| |
|
25-05-2009
| #8 | ||
| Mod and septic resident  Join Date: 01-01-2000 Location: London SW
Posts: 9265
Thanks: 6
Thanked 204 Times in 190 Posts
| Best way to check is to run a twin or quad LNB on the dish to start with, and link two wires back to the receiver, one via the motor. On the weakest channels, check the signal quality/reception on both cables after moving the dish to the required spot. | ||
| There is a very fine line between "hobby" and "mental illness" | |||
|
| |
|
| Bookmarks |
| Tags |
| diseqc, effect, motor, quality, signal |
| Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
| Thread Tools | |
| Display Modes | |
| |
Linear Mode
