[ARC5] S+N/N ratio results.

[Kenneth G. Gordon]

On 16 Jun 2013 at 18:13, Geoff wrote:

> While the cover accessories for the URM-25 are often missing there is
> plenty of Internet data on rolling your own. Im glad to see more
> people on here are joining the 6dB pad bandwagon I mentioned in this
> thread a few days ago. They are also beneficial and regularly used
> with modern radios and test equipment.
> 
> Carl

Hmmmm....now you guys have me wondering: I have been using some sort 
of pad (one of those that was with my URM-25) between my HP-8640B and 
the receivers I have been "messing with" since this exercise began.

It is one of those 50 ohm jobs that is in the small box with BNCs on both 
ends.

I did this since the only thing I know about the input impedances of the 
receivers is that it is "high", and I figured that such a box would give me a 
more accurate figure of what the SG is actually putting out.

I guess I had better go look more closely at it.

Sigh....this probably changes everything I have tried to do up to this point 
and I'll have to do it all over again.

Ken W7EKB