DG-OHM
UNAOHM Srl Rev. 4.0
24
c. Select TRANSMIT from the side menu to send the request to the SCR LNB
made up of:
TRANSPONDER FREQUENCY
POLARITY
10992
V (VERTICAL)
If the LNB is operational on that channel (A, B, C, D), the selected transponder (TP) on the
spectrum will be seen cut in half by the MARKER. This way, we will have correctly selected its
recall for frequency and polarity, therefore the check its quality as also takes place for classic
use we will press
to measure quality (BER MER etc.) and then
to download the NIT
and view the images.
In SCR mode, if the
button is pressed, the side menu appears which allows further
functions:
SCR
A
Selection of the 4 SCR channels
A-B-C-D
POL
V
Polarity setting
V= vertical ; H= horizontal
TRANSMIT
>>
Send request to the SCR LNB
SPAN
6
Select for spectrum view:
SPAN-FILTRO-V.FILTER-MKR
EXIT
Exit the SCR mode to return to classic
use.
ATTENTION:
Due to the diversity of SCR LNB technology with respect to the classic universal LNB, pay close attention to the
following points:
1) Programme memories cannot be used for SCR.
2) To set the frequency, we recommend using a numeric keypad as indicated above. Increasing with the
buttons may be slow, as the transponder frequency setting is not made by the internal tuner of
the field meter, but by the LNB SCR, which receives the request from the instrument and then modifies it
and responds later.
3) The vertical/horizontal polarity is no longer recalled by means of varying LNB voltage (13Volt = vertical,
18Volt=horizontal), but will form part of the package that we will send to the LNB SCR frequency, such
as V = vertical or H = horizontal.
4) To obtain the high band, we no longer activate the 22KHz, since it will be the LNB SCR itself to
understand by means of the transponder frequency we will send.
a. Fr TP < 11,750 low band.
b. Fr TP > 11,750 high band.
c.
