Re: [IRCA] 738 & SAH's from Michigan - Friday morning 9/7/2012

[Tim Tromp <kilokat7@xxxxxxxxx>]

Nick, this is a nice description and the audio samples are great.  I
appreciate the explanation and response, it all makes perfect sense now.

Thanks,
-Tim

On Fri, 2012-09-07 at 21:25 +0000, Nick Hall-Patch wrote:
> Here you go Tim.   http://www3.telus.net/public/shallpat/4tim/ 
> contains two .wav files from 1333UT this morning, both in LSB, one 
> with the receiver tuned to 828.4kHz, the other tuned to 738.4 kHz
> 
> There's a faster SAH on 828; if you play back the file on a spectral 
> display program, you'd see one het at 400.05 Hz, the other at 
> 402.7Hz, 2.65Hz separation, so the swishing sound repeats about 2 1/2 
> times per second.  I suspect these could be 3GI and JOBB?? (the 
> MWoffset list says that they have about a 1.5Hz separation, but the 
> records are from 5 and 6 years ago.   Guess I should try measuring 
> them when I know for sure which station I'm hearing!)
> 
> 738 has a slightly slower SAH (the two carriers are closer together), 
> but it also sounds a bit more complex, because there are at least 
> five (!) different hets there:  396.5, 400.9 and 401.5 Hz, with the 
> two strongest forming the slower SAH (compared with 828) at 398.0 and 
> 399.4Hz   The strongest are likely 2NR and R. Polynesie?  Both were 
> heard this morning.
> 
> Hope this helps.
> 
> Nick
> 
> At 10:51 07-09-12, you wrote:
> 
> 
> >I see a lot of talk about SAH's (sub-audible hets I presume?).  Can
> >someone provide good audio demonstrating this phenomena?
> >
> 
> 
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