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SL-3 SWM: 21 or 29 volt PI


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12 replies to this topic

#1 OFFLINE   BennyGregg

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Posted 03 October 2012 - 12:38 PM

I believe that the PI for the SL-3 SWM initially was 21 volts but that recently 29 volt PI's for the SL-3 SWM have been recommended. Is either PI acceptable, and is one voltage PI better than the other for some reason?

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#2 OFFLINE   jimmie57

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Posted 03 October 2012 - 01:35 PM

From what I read,
The 21 volt is the proper one for the SWM dishes. They were originally tested with the 29 volt and in some cases where there is a lot of coax with long runs you could see a voltage drop and then the 29 volt might be used for that instance.

I am not an installer or tech.

DirecTV customer since 1996 - Current :Slimline 3 SWM,   HR24-100 HDMI to 32" Sharp LED,
HR24-100 Component cables to 46" Samsung LCD & Optical Cable to Yamaha AVR, H21-200 HDMI to Yamaha AVR & HDMI to 52" Mitsubishi LCD


#3 OFFLINE   BennyGregg

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Posted 03 October 2012 - 01:54 PM

What prompted my question was a specification I saw on the Solid Signal site which says "The SL3-SWM LNB is designed with an built-in 8-channel multiswitch which allows you to have multiple satellite feeds at once. This product requires the SWM PI-29 29v (NOT INCLUDED) Power Inserter ..."

#4 OFFLINE   jimmie57

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Posted 03 October 2012 - 02:05 PM

It sure does say that on the Solid Signal site. I would have bet big money that it said 21 volt.
I just was upgraded in June from a legacy system to the Slimline 3 SWM system and they installed the 21 volt on mine.
Veryoldschool and some of the others will have more information about this.

Edit: I just went to the DirecTV Installers forum and did not see anything about a change in the power inserter.

Edited by jimmie57, 03 October 2012 - 02:18 PM.

DirecTV customer since 1996 - Current :Slimline 3 SWM,   HR24-100 HDMI to 32" Sharp LED,
HR24-100 Component cables to 46" Samsung LCD & Optical Cable to Yamaha AVR, H21-200 HDMI to Yamaha AVR & HDMI to 52" Mitsubishi LCD


#5 OFFLINE   dielray

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Posted 03 October 2012 - 02:38 PM

The PI-21 is the power inserter most commonly used with a SWM LNB.
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#6 OFFLINE   Stuart Sweet

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Posted 03 October 2012 - 03:12 PM

Agreed, but I'll say two things. First of all the extra voltage won't hurt the LNB, in fact it may allow for a stronger signal over long lines. Second, I've heard from several sources that the 29 volt power inserter will be the recommended choice in the future.
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#7 OFFLINE   dielray

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Posted 03 October 2012 - 05:19 PM

Agreed, but I'll say two things. First of all the extra voltage won't hurt the LNB, in fact it may allow for a stronger signal over long lines. Second, I've heard from several sources that the 29 volt power inserter will be the recommended choice in the future.


What do you mean by stronger signal? I've never observed this characteristic regarding SNR. I'll have to look in to power level.

Would be interesting if it becomes standard. One of their reasons for the new broadband DECA was to decrease the number of different power supplies manufactured.
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#8 OFFLINE   Stuart Sweet

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Posted 03 October 2012 - 05:35 PM

I was told the signal strength was a little higher with the 29 volt.
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#9 OFFLINE   caseyf5

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Posted 12 November 2012 - 07:42 AM

I believe that the PI for the SL-3 SWM initially was 21 volts but that recently 29 volt PI's for the SL-3 SWM have been recommended. Is either PI acceptable, and is one voltage PI better than the other for some reason?

Hello BennyGreg,

I have read on this site that the people doing the hardware testing used the 29v Power Inserter due to the fact that there was no 21v PI. That was used at a later time but the 29v PI was used as one alternative if the signal level was lower than optimum after all other methods of increasing the signal level were tried without much success. This seems to be a case where more than one power adapter can be used to substitute for another. :confused: :) :cool:
My setup: 1 HR34/700 DVR no external HD, 1 HR24/500 DVR using WD 2TB Green HD and Antec MX-1 enclosure (used for CE) and 3 H24/700 receivers, 1 SL5 Dish (4 cable), 1 SWM16 Multiswitch, 1 Wired CCK. 1 Whole Home with DECA, 1 Sharp LC-37GP1U TV, 1 Sony Home Theater System HT-CT550W (Soundbar), 1 Impact 6x2 Component Video Matrix (Switcher) and 2 Sewell 1x2 HDMI Splitters with Ethernet, 3D Support and 4Kx2K Resolution with multiple hdmi cables with Ethernet.

#10 OFFLINE   P Smith

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Posted 12 November 2012 - 01:22 PM

I wouldn't bet on the additional 8 volts as a factor of increasing a signal level.

Usually such devices has voltage regulator (someone has bad SL3 LNBF for dismantling ?) and the PI should deliver 2 or 3 volts higher then Vout of the internal VR.
So, increase Vin to 29 V shouldn't change parameters of internal circuit eg gain, SNR, etc.

#11 OFFLINE   Stuart Sweet

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Posted 12 November 2012 - 01:29 PM

P,

I'll take the advice of about a dozen DIRECTV engineers, including the product manager for SWMs, and all of them disagree with you.
Opinions expressed by me are my own and do not necessarily reflect
those of DBSTalk.com, DIRECTV, DISH, The Signal Group, or any other company.

#12 OFFLINE   veryoldschool

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Posted 12 November 2012 - 01:29 PM

I wouldn't bet on the additional 8 volts as a factor of increasing a signal level.

Usually such devices has voltage regulator (someone has bad SL3 LNBF for dismantling ?) and the PI should deliver 2 or 3 volts higher then Vout of the internal VR.
So, increase Vin to 29 V shouldn't change parameters of internal circuit eg gain, SNR, etc.

"You're right, but" if the 21 volt wasn't supplying enough due to a voltage drop through the coax, then the change to a 29 volt would get the SWiM back up to full supply power.
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#13 OFFLINE   P Smith

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Posted 12 November 2012 - 04:16 PM

P,

I'll take the advice of about a dozen DIRECTV engineers, including the product manager for SWMs, and all of them disagree with you.


It would be simple as see your face :) - post a schematics !


Or give me the damn SL3 for dismantling.
Who has broken one ?!




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