Re: [amsat-bb] TV splitters-revised question

[Art Goldman <aegoldm@xxxxxxxxxxxx>]

Bob:

I have a DEM converter plus a DEM preamp. The DEM converter
comes with an RCA jack that serves as an alternate power
input (for bench testing I guess). I replaced that with an F
connector and moved the power lead to the point where the
power comes in from the IF connector. On the preamp, I
drilled a hole and installed a chassis F connector, and
connected it to where the power would come in thru the coax
feed. A waterproof F jumper between the two units completes
the circuit. 

I also added an F connector on my 3733 for the same purpose.

Seems to work fine. No splitter required.

Original idea came from Don, W4VQA.

73,
Art N3OY


Bob McElligott wrote:
> 
> Perhaps my original question was not clear enough.  My question is about
> powering a pre-amp and a downconverter on the same coax.  The coax runs from
> my radio carrying 12 volts to the downconverter.  Can I use a common F-type
> TV splitter to split the 12 vdc so that it can also power the pre-amp? Will
> the small amount of 2 Meter RF which comes out of the downconverter affect
> the operations of pre-amp, since the splitter also feeds it back to the
> pre-amp and the radio simultaneously.  Please try to understand my crude and
> simple illustration.
> 
>   2.4GHz Antenna XXXXXXXXXXX         XXXXXXXXXXXXXXXXX
>             >------> Pre-Amp <---------> Downconverter X
> Yeasu 736R Pre-amp Sw.
>                  X XXXXXXXXX         XXXXXXXXXXXXXXXXX
> I---< 2 Meter RCV Section
>                        I                    I        12vdc & 2M RF from
> Downcoverter  I
> 
> I<------------------OOOOOOO------------------------------------>
>                               12vdc       Splitter       Coax carrying 12vdc
> from Radio or DC insertion device
> 
> Sorry if I caused some confusion with my original question, but I really
> appreciate all the nice answers that I have received, but still have
> questions in my mind how to accomplish powering the downconverter and
> pre-amp at the same time.
> 
> Thanks again!
> 
> 73,  Bob McElligott  HL2/KK4UZ
> 
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-- 
Art Goldman
Senior Network Engineer
Logicon DPC, Contractor to:
NSA Laboratory for Telecommunications Sciences
(301)688-1719
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