Direct TV disk and LNA
 

Hi Goup de KJ4UO.

I picked up on for the Direct TV disk with the LNA. The LNA states a frequeny
range of 19 to 23 cm.

I understand the the LNA gets it power from a DC voltage that is transmitted
down the line.

My questions:

For the DC voltage on the cable, how much is required and how much is the max?

What is the IF down converter frequency?

Can I use my FRG-9600 which has continuous coverage from 60 to 934 MHz as an
variable IF to decode voice data?

In general is there a good site to return to and get technical facts on DT
equipment.

Thanks,

Paul

In article ,
PDRUNEN wrote:

Hi Goup de KJ4UO.

I picked up on for the Direct TV disk with the LNA. The LNA states a frequeny
range of 19 to 23 cm.

I understand the the LNA gets it power from a DC voltage that is transmitted
down the line.

My questions:

For the DC voltage on the cable, how much is required and how much is the max?

The receiver typically puts either 13, or 18 volts onto the coax,
depending on whether it wishes to receive the lefthand or righthand
circular polarizations. There's often some voltage drop between the
receiver and the LNA/LNB.

What is the IF down converter frequency?

There's no single downconverter frequency. The system uses a
low-noise block converter, which downconverts a whole range of
frequencies simultaneously. I believe you'll find the downconverted
signals located between 950 and 1450 MHz, if you aim the dish at a
DirecTV satellite. The block converter is designed so that its usual
outputs don't fall below 900 MHz - this allows a single coax to carry
both the downconverted satellite signals, and VHF/UHF television
signals via a diplexer.

Can I use my FRG-9600 which has continuous coverage from 60 to 934 MHz as an
variable IF to decode voice data?

I don't know whether the block converter will output frequencies that
low... they're below its normal output operating range.

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

Dave is correct about the IF freq, but: the local osc in the LNB
covers two ranges: 13 to 18 VDC it will osc in the low band, 22-28 it
will osc in the high band. The LNBs I've seen use an signal about
20khz sent from the satellite reciever to switch polarizations.
Adjacent channels are oppisitely polarized, circularly.
On 30 Jun 2004 03:52:52 GMT, (PDRUNEN) wrote:

Hi Goup de KJ4UO.

I picked up on for the Direct TV disk with the LNA. The LNA states a frequeny
range of 19 to 23 cm.

I understand the the LNA gets it power from a DC voltage that is transmitted
down the line.

My questions:

For the DC voltage on the cable, how much is required and how much is the max?

What is the IF down converter frequency?

Can I use my FRG-9600 which has continuous coverage from 60 to 934 MHz as an
variable IF to decode voice data?

In general is there a good site to return to and get technical facts on DT
equipment.

Thanks,

Paul

wrote in message
...
Dave is correct about the IF freq, but: the local osc in the LNB
covers two ranges: 13 to 18 VDC it will osc in the low band, 22-28 it
will osc in the high band. The LNBs I've seen use an signal about
20khz sent from the satellite reciever to switch polarizations.
Adjacent channels are oppisitely polarized, circularly.

The normal DTV uses 13 or 18 to switch polarity. The 20kHz is
probably required for the triple or dual LNBs to select which
of the three birds is being received.

Pete