Transponder# to freq converter?

[freezy]

depending where feed research comes from, often a small number is listed not a frequency.

I don't know how to change the number to a freq so I can scan it.

is there a book or something?

thanks

 

[B.J.]

depending where feed research comes from, often a small number is listed not a frequency.

I don't know how to change the number to a freq so I can scan it.

is there a book or something?

thanks

Could you give an example of what you're referring to re the smaller number? Ie the smaller number might be an IF freq, like 970 or something, often used with DCII transponders. If it's really transponder numbers, your best bet is to look at Lyngsat, as that is usually accurate, but there is often a difference between how the satellite owners have named the transponders, and how us users name the transponders.
For C-band, things are usually pretty standard, ie 3720=TP1, 3740=TP2, and so on, up by 20 MHz each transponder. However just because this is the center of the transponder doesn't mean that that is where a DVB signal will be found, unless it is a high SR signal, which are usually centered in the transponder. Low SR signals can be found anywhere within the +/- 20 MHz band.
On Ku, there is no standard. On Ku, sats often have a mixture of normal width transponders, and double wide transponders, and some have intermediate widths, and the sat owners often name what we might refer to as separate transponders as a TP1-low, and TP-1-high, or some notation to differentiate the two half transponders. The newer Ku sats seem to be more standard than the old ones, but there are still enough of the old ones to make things very confusing. Also, the sat owners often name the Ku transponders with numbers that continue on in sequence after the C-band transponders, so where we might refer to a TP-1 Ku, the real TP number might be 25 or something.
Basically, there is no standard on Ku, but even if there were, the freq numbers you'd get would only be center of the band numbers, and would not necessarily be the frequency of the signal. We refer to these satellite signals as "transponders", when in reality, a transponder might have numerous signals.
Sometimes the networks divide up satellites into set frequencies which they name as 1D , 1E, 1F , etc, to represent narrow slots where their uplinks will appear, but these aren't really transponders, just frequencies within a transponder where the signal will appear.

 

[Corrado]

I think you're referring the smaller freq. as the I.F. freq.

Example C band LNB L.O. Freq. 5150mhz-3720mhz=1430mhz

 

[Mr Tony]

yep

for digital C-band take the IF and subtract it from 5150
for KU Band add the IF to the LNB LO (9750, 10600, 10750, 11250 etc)

 

[freezy]

eg....

SBS 6 / 74W - Transponders - 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19

 

[Mr Tony]

some info on H2

Horizons-2

 

[freezy]

seems a waste for only Ohio News

 

[Mr Tony]

lots of sports feeds on there too

When Dish use to have programming on 105W (AMC15) H2 (well it was SBS6 at the time) use to be the "sports feeds" satellite. Then Dish stripped 105 of programming and still is leasing the satellite so now they sublease it.

Now it seems like 105 has more...probably due to the center of the US location

 

[freezy]

therewas some hockey and bsketball earlier. got some soccer going now

do they use the same tp and sr combos or do they switch it around alot?

 

[Mr Tony]

usually different. Some stations may use the same info but the frequencies/symbol rates change all the time. Blind scan receiver is the best for those

 

[B.J.]

seems a waste for only Ohio News

? A waste with respect to us tvor'ers or a waste with respect to the satellite being fully utilized?
If the latter, then I can assure you that that satellite is not going to waste. I just did a scan of the horizontal side, and virtually every transponder, with perhaps one exception is being used. I counted at least 18 quite strong signals on the horizontal side alone, and a few weak ones that I'm not sure if they are real or noise from another sat.
My point is, just because Lyngsat and other lists might only list one or two transponders doesn't mean that the satellite isn't being used. There is one popular satellite up there that Lyngsat has listed as being Ku only, and yet every single transponder is being used on C-band. The people using these satellites generally aren't concerned with making things compatable for us sharing their signal. We're lucky to be able to view what we're able to view.

Anyway, that sat isn't going to waste.

 

[freezy]

like the linear ku side ow 129w. White Springs is kinda lonely. You would think for advertising they would want to be on a busier bird or sidle up with retro tv.

77w seems real popular all of sudden.

I was watching a news truck drive East on I-80 through Illinois AMC6 11703v3195 (Bloom)

 

[freezy]

So what do those 1 and 2 digit numbers represent?

 

[meinename]

So what do those 1 and 2 digit numbers represent?

Frequency range and Polarity
The odd numbered are one polarity and the even are the opposite polarity

What I have trouble remembering is if an Analog NTSC channel/transponder over Satellite is 20 MHz wide or 30 MHz wide as well as if the transponders are stepped or not between polarities. It makes a difference for my example.

Stepped Verision 
note: I used 30MHz here- not bothered enough to fix it. It's an EXAMPLE

Transponder 1 | 11700-11729MHz Vertical
Transponder 2 | 11715-11744MHz Horizontal
Transponder 3 | 11730-11759MHz Vertical
Transponder 4 | 11745-11774MHz Horizontal
...... (I'm fudging it below here...)......
Transponder 31 | 12145-12175MHz Vertical
Transponder 32 | 12170-12199MHz Horizontal

Oh well Wikipedia and the owner say 36MHz per transponder.

Okay now I'll work out the non-stepped version in it's fullest since I've yet to come across a chart of these.

Straight transponder-frequency list
With IF (coax line frequency) assuming L.O. of 10750 for Ku FSS 11700-12200
Transponder  1 | 11700-11736MHz Vertical   | ( 950- 986MHz)
Transponder  2 | 11700-11736MHz Horizontal | ( 950- 986MHz)
Transponder  3 | 11737-11773MHz Vertical   | ( 987-1023MHz)
Transponder  4 | 11737-11773MHz Horizontal | ( 987-1023MHz)
Transponder  5 | 11774-11810MHz Vertical   | (1024-1060MHz)
Transponder  6 | 11774-11810MHz Horizontal | (1024-1060MHz)
Transponder  7 | 11811-11847MHz Vertical   | (1061-1097MHz)
Transponder  8 | 11811-11847MHz Horizontal | (1061-1097MHz)
Transponder  9 | 11848-11884MHz Vertical   | (1098-1134MHz)
Transponder 10 | 11848-11884MHz Horizontal | (1098-1134MHz)
Transponder 11 | 11885-11921MHz Vertical   | (1135-1171MHz)
Transponder 12 | 11885-11921MHz Horizontal | (1135-1171MHz)
Transponder 13 | 11922-11958MHz Vertical   | (1172-1208MHz)
Transponder 14 | 11922-11958MHz Horizontal | (1172-1208MHz)
Transponder 15 | 11959-11995MHz Vertical   | (1209-1245MHz)
Transponder 16 | 11959-11995MHz Horizontal | (1209-1245MHz)
Transponder 17 | 11996-12032MHz Vertical   | (1246-1282MHz)
Transponder 18 | 11996-12032MHz Horizontal | (1246-1282MHz)
Transponder 19 | 12033-12069MHz Vertical   | (1283-1319MHz)
Transponder 20 | 12033-12069MHz Horizontal | (1283-1319MHz)
Transponder 21 | 12070-12106MHz Vertical   | (1320-1356MHz)
Transponder 22 | 12070-12106MHz Horizontal | (1320-1356MHz)
Transponder 23 | 12107-12143MHz Vertical   | (1357-1393MHz)
Transponder 24 | 12107-12143MHz Horizontal | (1357-1393MHz)
Transponder 25 | 12144-12180MHz Vertical   | (1394-1430MHz)
Transponder 26 | 12144-12180MHz Horizontal | (1394-1430MHz)
Transponder 27 | 12181-12217MHz Vertical   | (1431-1467MHz)
Transponder 28 | 12181-12217MHz Horizontal | (1431-1467MHz)

Hoorah I'm an idiot. I'm tired and I missed something really important because that should have ended on 12200MHz (1450MHz) and the analog boxes I have used only have 24 transponders

Remember that H2 @ 74°W only has the first 16 transponders available. Well 4 more are double-wide 72MHz transponders and I Have no idea which ones those are on H2

Disclaimer: This is only what I understand from what I've read. Any real experts on the subject want to correct me, I would love to read what they have to say.
Alot of my ranting, like this, is me collecting and organizing my understanding into something readable/writeable/speakable.

 

[B.J.]

Frequency range and Polarity
The odd numbered are one polarity and the even are the opposite polarity

While that's usually the case now, it did used to allways be true. For example, those crazy Canadians )) used to number like 1-16 one polarity, and 17-32 the other polarity. Even now, I've seen some exceptions to the odd/even way of telling polarity. But in general, yes.

What I have trouble remembering is if an Analog NTSC channel/transponder over Satellite is 20 MHz wide or 30 MHz wide as well as if the transponders are stepped or not between polarities. It makes a difference for my example.

.....

I don't think your examples are correct. For C-band analog transponders are pretty simple, and even though there isn't much analog left, the transponders are still pretty much the same. Ie transponders 1 thru 5 might be:
(1) 3700-3740 center freq 3720 V
(2) 3720-3760 center freq 3740 H
(3) 3740-3780 center freq 3760 V
(4) 3760-3800 center freq 3780 H
(5) 3780-3820 center freq 3800 V

etc, etc . Ie they overlap. Each transponder is about 36 MHz wide, centered in the 40 MHz band. The overlap used to be more meaninful in analog days.

Ku band is more complicated, because most Ku sats are a mixture of different width transponders, but in the end, it is very similar.

Generally, you can go to the web page of the sat owner to get the frequency charts.

For example:
SES AMERICOM - C-band
SES AMERICOM - Ku-band

There used to be bunches of nice charts on the web, but they are getting harder to find. I've collected some of the old ones.

 

[ACRadio]

Going back to what BJ was saying in an earlier post about satellite usage, us TV people sometimes think that if there are no TV signals that the satellites aren't being used. But satellites are clogged with all kinds of internet and data traffic. Email can be spooled off to satellite links since a bit of delay doesn't bother it. Also look at all the gas stations that send their credit card authorizations and lotto ticket info by satellite. They use the same satellites we use to watch TV. Looking at the sats with a spectrum analyzer really tells the story.....

 

[B.J.]

I was trying to find links to some frequency charts I used to go to, but couldn't.
So I'm attaching below an example of what the sat owners used to put on their web pages. I'm sure this and others can still be found in archives, but it's getting harder to find these things.

 

[freezy]

Thats exactly what I was looking for!!!!!

Awesomenesss!!!

 

[Mr Tony]

While that's usually the case now, it did used to allways be true. For example, those crazy Canadians )) used to number like 1-16 one polarity, and 17-32 the other polarity. Even now, I've seen some exceptions to the odd/even way of telling polarity. But in general, yes.

The Anik sats are still like that. AnikF1 is 1-16 V and 17-32 H

 

[meinename]

While that's usually the case now, it did used to allways be true. For example, those crazy Canadians )) used to number like 1-16 one polarity, and 17-32 the other polarity. Even now, I've seen some exceptions to the odd/even way of telling polarity. But in general, yes.

I don't think your examples are correct. For C-band analog transponders are pretty simple, and even though there isn't much analog left, the transponders are still pretty much the same. Ie transponders 1 thru 5 might be:
(1) 3700-3740 center freq 3720 V
(2) 3720-3760 center freq 3740 H
(3) 3740-3780 center freq 3760 V
(4) 3760-3800 center freq 3780 H
(5) 3780-3820 center freq 3800 V

etc, etc . Ie they overlap. Each transponder is about 36 MHz wide, centered in the 40 MHz band. The overlap used to be more meaninful in analog days.

Ku band is more complicated, because most Ku sats are a mixture of different width transponders, but in the end, it is very similar.

Generally, you can go to the web page of the sat owner to get the frequency charts.

For example:
SES AMERICOM - C-band
SES AMERICOM - Ku-band

There used to be bunches of nice charts on the web, but they are getting harder to find. I've collected some of the old ones.

So they were "stepped/staggard" like I thought. It was that 36MHz usable in a 40MHz slot that I think got me.
But that chart was more of a mental exercise for me. Thank you B.J. for clearing that whole mess up