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Re: Downconverter noise

On Tuesday, May 27, 2003, at 08:28 America/Chicago, Ryan Butler wrote:

> If the full instruction sheet is read, it does make sense, these AIDC
> converters were originally created to drive multiple tv's through
> splitters over long distances (100' of rg-59).  So the IF conversion
> gain on them is at around 37 dB.  So of course on 2m, the noise level 
> is
> going to be extremely high.  K5GNA recommends using at least 50' of
> rg-59 and a 6 dB pad to get the s meter down to s0, or s1.

That's a good point.  I have one of the 30 dB AIDCs but I am running it 
through plenty of RG-6 coax.  I suppose that picking up all the thermal 
noise from internal surroundings plus having a short piece of coax 
would add plenty to the noise seen by the rig.



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