[hpsdr] FM squelch

[Ken N9VV (Win-7/64)]

I am not sure that I can offer you a good explanation about this Alf, 
but you might want to use a calibrated signal source like the Elecraft 
XG-1 which emits a 50uv = S9 = -73db signal at 7040, and has another 
setting of -113db = S1 = ?uv with a switch.

You can then know that your receiver is properly calibrated with any 
sort of input. I believe some of the more modern Elecraft calibrators 
allow you to select any frequency you wish.

Perhaps you could substitute the calibrated signal for the IF signal 
coming from the transverter, and then adjust the SQUELCH on/off and 
level slider as needed to verify it's tripping levels in your setup.

GL de Ken N9VV

On 8/2/2014 2:47 PM, Alfred Green wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Greetings,
>
> I'm currently using mRX PS v3.2.17 with a Hermes and homebrew transverters.
>
> I rarely operate FM, but a local station was active for the UHF contest
> with an FM rig on 1296, so I worked him for the point.
> However, the signal was pretty weak, although quite visible on the
> waterfall. I would have liked to have opened the squelch to assist with
> the copy, but setting SQL to zero didn't do the trick. I had to wait for
> the signal to get a good ways over the noise before the rx would open.
>
> I'm pretty sure this worked differently in an earlier release, but as I
> rarely do this I could be mistaken.
>
> Am I missing a setting, or is this performance to be expected?
>
> 73  Alf  NU8I
> Phoenix  AZ  DM33xo
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