"Another option" could be to utilize the current bandwidth by reducing the [current] SWM channel bandwidth of 100 MHz, down to 70 MHz. This would "simply" let 16 tuners access the same "SWM Band" that the eight are now. Guide Data channel stays the same, the upper limit is raised to 2150 MHz from the ~ 1800 MHz now.
I don't know if this is the way they'll do the SWM16, but it would resolve the dual cable problem.
Well, well ... it's time !
For reality. Not papers.
Today was perfect day to see what SWiM LNBF sending to coax.
Used Slimline dish with SL3S4NR2-02 (green label) LNBF, NPM (to avoid damaging HOA paved road ), spectrum analyzer PSA-37D (it's provided +18VDC to the LNBF) and someone in light plastic chair .
Some notes to pictures:
- seems to me the SA has different offset/error on two ranges: 950-1450 and 1250-1750 MHz (it's old model, does not support second stacked range 1650-2150 MHz, but for the SWiM SL3 LNBF it's OK as you'll see from measures); I recall on 950-1450 range it has +5 MHz reading, looks like other range has +15 MHz error;
- I'm posting reading freqs (with instrumental errors);
- FW of the LNBF take time for booting: 10 seconds before any RF signal will comes out;
- last two pictures show output without LOS and with it - to show you : the LNBF constantly sending wide signal to coax cable;
- lowest part of the LNBF signal has two small [analog] peaks:at 907 MHz and 915 MHz;
- LNBF RF wide signal begin from 918 MHz, finishing at 1850 MHz;
- first 'transponder' begin at 940 MHz;
- each 52 MHz band has two parts: first is normal 24 MHz (!) transponder-like pedestal, second part looks unusual - triangle shape (what is there ? artifact ?) ;
- measured 18 bands, first and last freq of each rectangle signal presenting in a table below:
Edited by P Smith, 24 April 2013 - 09:04 PM.