Snr & agc

[Jerry2020]

What is the difference between SNR and AGC?
On which does the quality of reception depend?

[pan1300]

Re: Snr & agc

What is the difference between SNR and AGC?
On which does the quality of reception depend?

hi Jerry2020

SNR is the "Signal-To-Noise Ratio", or the ratio between the signal and the noise. This must be high to have a good quality (the higher the better). AGC is the Automatic Gain Control, and less important.

There's also BER (Bit-Error Rate). The lower the better (best to have 0).

If you want to know more, have a ******

[KVF1966]

Re: Snr & agc

SNR - Signal Noice Rate is the ratio of signal-to-noise ratio value, which indicates the strength and quality of the reception of a satellite signal.
AGC Automatic Gain Control - this parameter shows the status of the automatic gain control for the receiver.
With an ideal setting both parameters are about 100 percent

[Jerry2020]

Re: Snr & agc

Thanks guys.
What confuses me is that for some channels I find the SNR not high enough and the AGC a lot higher, while the channel reception is not good.
Does this mean high interference?

[Satphoenix]

Re: Snr & agc

You have two receiving parameters, the signal strength and the signal noice rate. The first gives information how strong is the signal and the second about the signal quality. A strong signal with a low snr is similar to a white-noise and nearly useless. So it's important to have a high snr.

[pan1300]

Re: Snr & agc

Thanks guys.
What confuses me is that for some channels I find the SNR not high enough and the AGC a lot higher, while the channel reception is not good.
Does this mean high interference?

confirms my previous post: low SNR is bad quality and reception ; some possible reasons: dish too small (check footprint with eg satbeams), setup not perfect (perhaps try to turn the dish slightly left or right) - best is to check with a 'weak' tp to get best SNR.

[Jerry2020]

Re: Snr & agc

You have two receiving parameters, the signal strength and the signal noice rate. The first gives information how strong is the signal and the second about the signal quality. A strong signal with a low snr is similar to a white-noise and nearly useless. So it's important to have a high snr.

This is confusing to me. Which of them describes the quality of the signal?

[Satphoenix]

Re: Snr & agc

This is confusing to me. Which of them describes the quality of the signal?

The snr is similar to signal quality. So it's very important to have a high value there. Only high signal strenght but low snr gives a very poor result. A possible reason is a low quality lnb.

[Jerry2020]

Re: Snr & agc

The snr is similar to signal quality. So it's very important to have a high value there. Only high signal strenght but low snr gives a very poor result. A possible reason is a low quality lnb.

I think a low quality lnb would affect all tp's or at least many ones, correct?

[Satphoenix]

Re: Snr & agc

I think a low quality lnb would affect all tp's or at least many ones, correct?

Yes, but it's not only the lnb. Plugs, cables, dish-size and switches have a sinificant influence to both, signal strength and snr.

[ecsbox360]

Re: Snr & agc

I use the following dubbed down version with anyone i speak to about SNR & AGC when they see it on their receiver.
SNR = Satellite Signal (When installing your dish,tweak dish/motor up/down/left/right & lnb skew for maximum SNR)
AGC = Quality of SNR (depends on dish size, setup, lnb skew etc)

Its possible to get a lock on 39% AGC

[Jerry2020]

Re: Snr & agc

I use the following dubbed down version with anyone i speak to about SNR & AGC when they see it on their receiver.
SNR = Satellite Signal (When installing your dish,tweak dish/motor up/down/left/right & lnb skew for maximum SNR)
AGC = Quality of SNR (depends on dish size, setup, lnb skew etc)

Its possible to get a lock on 39% AGC

I can't see the difference between the two definitions

[easydigital]

Re: Snr & agc

the AGC and SNR is lower on the Solo2, and the AGC and SNR is higher on the Uno....

[Jerry2020]

Re: Snr & agc

the AGC and SNR is lower on the Solo2, and the AGC and SNR is higher on the Uno....

Do you mean the sensitivity?

[jonny2by4]

Re: Snr & agc

The difference between SNR & AGC is:
1- Signal quality
2- Signal strength
Quality of reception depends on both they should be high and your BER should be as low as possible. If not check your dish alignment.