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

[Nick Hall-Patch <nhp@xxxxxxxx>]

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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