Norsat 4000A voltage

[Larry Acklin]

I have a channelmaster/andrew 1 m dish, and I am outfitting it with an orthomode feed,both lnbs fed to a multiswitch. The idea here is to use the outputs of the multiswitch to feed multiple receivers for IA-5 Ku. (g-25)

The question- the norsat 4000 lnb specs have a lower voltage of 14v. The receiver likely will be putting out 13 +/- which the multi will push to one lnb all the time.

Does the norsat loose sensitivity when operating at the lowest voltage setting?

Does the regulator inboard drop out and cause the LNB to freak out?

I have 2 commercial grade LNBs for this project, a dawn and a norsat, and the dawn seems to behave well at the lower voltage. I expect the same from the norsat- but don't want to sacrifice sensitivity or stability.

Thoughts anyone?

Larry

[Larry Acklin]

So it works OK. I have the Dawn and Norsat LNBs attached to the Andrew orthomode feed assy, the feed bolted to the Channelmaster horn, and the outputs attached to an RCA multiswitch.

And it works good- PBS feeds at 75%, quality 68-70.
Montana PBS at 75%, quality 65-68
Even the IRDU muslim channels at 75%, quality 62-68

Don't go to this extreme unless you have the parts already- I spent $40 plus shipping for the feed (ebay) another $15 or so for the multiswitch, and already had the LNBs.

All this came about because I wanted 2 independent outputs off that dish, and finding a C120 flange dual output LNB (only Invacom makes it) was getting hard.

But it works, even at the reduced voltages present at the LNBs.



Larry

[wejones]

Good info. I thought your chances were about 50/50. Some lnbs don't work very well at 13-14V. Usually the specs give that as a lower limit. I have 3 Cal-Amp lnbs and one Norsat, and I seem to remember experimenting with one of these at 13V, and it worked, but not as well as it did at 18V.
But anyway, good info.