[R-390] The OLE receiver sensitivity test revisited

[Curt Nixon]

That is interesting..

I also have a generator that will go down to -138.  I haven't tried it 
but that would be under no noise conditions..only internal noise.  On 
HF, it is my experience that for the most part, we are never limited by 
the sensitivity or the noise floor of the Rx but the level of QRN present.

Curt
KU8L

On 2/28/2012 8:07 PM, wb5uom at hughes.net wrote:
>
>
>   Ok Now that there are some awake from the PING Test:
>
>   I know that there is the 'standard' +30 plus year old method(s) of
>   measuring receiver sensitivity on the R-390.
>
> But, since I took delivery of my AeroFlex 3920 service monitor, (primarily
>   for working on P25 digital radios) and after a couple of firmware upgrades
>   to get the SSB generate fuction on track with the correct readings, and
> seeing as how it now goes down to -138DBm, I though I could put it to use at
> home as well.
>
>   In SSB mode and with a 1000cycle tone, I can hear it all the way down
> to -138DBm on my
>   R-390 (I get down to various levels on my other receivers,but not that far,
>   which tells me I could copy a CW signal pretty much down in the mud (If I
>   had headphones on)
>
>   My idea is to make a test tape of sorts into a .wav file on the pc and play
> it
>   back thru the external mod input on the service monitor
>   to see how far down I can go with VOICE.
> Actually,I thought about recording an actual broadcast of whatever (AM /
> SSB )
> and play that back thru to give me more realism, and crank the level down
> and see how I can go.
>
> What the heck Ive got over $50K in the machine, might as well put it to use!
>
>   Thoughts?
>
>   David / WB5UOM
>
> ______________________________________________________________
> R-390 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-390
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:R-390 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>