[TenTec] Effect of roofing filter selection on Orion II NB

[Grant Youngman]

>          There are some key points you omitted.
> First AGC must be OFF, otherwise Orion's AGC will readjust 
> the audio output.  

Yes, it was off.

> Second, is the TS-585 a True-RMS 
> responding meter?  A

No, it was just easier to get to.  So this morning, I dug into my storage
closet, and pulled another meter.  It isn't a 339A but it is a true RMS
meter

I redid the measurement, this time with an HP 331A Distortion Analyser

The results are about the same -- 8-10dB measured on 14 Mhz, and around 5-6
dB measured on 7 Mhz where the noise has a  different characteristic.  Last
night, when 40 was much noisier than it is this morning, the improvement was
only on the order of 3dB, but that was measured with a non-RMS meter so I'll
have to take another look at it tonight.


Grant