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From: W. eWatson on 6 Jul 2010 15:24

Somewhere I came across a setup for a simple "itty bitty" radio
telescope a number of years ago. Its purpose is educational. Basically,
it consists of a discarded 18" dish, power supply, and a satellite
signal finder. I happen to have a Channel Master 1004ifd finder, but it
gets its power from the LNB, which apparently gets it from a satellite
rcvr. I have no rcvr. I'm looking for a way to power it.

WEll, lucky me. A small amount of Googling got me to
<http://www.aoc.nrao.edu/epo/teachers/ittybitty/procedure.html>
I'm not sure our local The Shack has a choke. I may have one. My LNB is
different than the one in the pic. It's a Eagle Aspen DTV32+. I'm sure I
have a battery clip and 8 battery holder. This might do it. I didn't
notice the Rx connector on my CM1004, but that is where the power goes.
I may be set.

I constructed the battery pack in the link above, but w/o the coil. I
plugged it into the 1004ifd and immediately got something of a single
note noise from the device. This seems wrong. Any ideas? I did not
connect to the LNB and disk.


From: W. eWatson on 7 Jul 2010 15:48
On 7/7/2010 4:59 AM, Jasen Betts wrote:
> On 2010-07-06, W. eWatson<wolftracks(a)invalid.com> wrote:
>>
>> Somewhere I came across a setup for a simple "itty bitty" radio
>> telescope a number of years ago. Its purpose is educational. Basically,
>> it consists of a discarded 18" dish, power supply, and a satellite
>> signal finder. I happen to have a Channel Master 1004ifd finder, but it
>> gets its power from the LNB, which apparently gets it from a satellite
>> rcvr. I have no rcvr. I'm looking for a way to power it.
>
> 13VDC up the coax, center positive.
>
>> WEll, lucky me. A small amount of Googling got me to
>> <http://www.aoc.nrao.edu/epo/teachers/ittybitty/procedure.html>
>> I'm not sure our local The Shack has a choke. I may have one. My LNB is
>> different than the one in the pic. It's a Eagle Aspen DTV32+. I'm sure I
>> have a battery clip and 8 battery holder. This might do it. I didn't
>> notice the Rx connector on my CM1004, but that is where the power goes.
>> I may be set.
>
> yeah, 12V may be enough, the connector is probably 'F'
>
>> I constructed the battery pack in the link above, but w/o the coil. I
>> plugged it into the 1004ifd and immediately got something of a single
>> note noise from the device. This seems wrong. Any ideas? I did not
>> connect to the LNB and disk.
>
> with the input open circuit unloaded and the output shorted it could be oscilating,
> or that could be the base level tone.
>
>
> --- news://freenews.netfront.net/ - complaints: news(a)netfront.net ---

Thanks. So I should put the choke in and connect the LNB? Yes, F.
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