[IRCA] IBOC sideband amplitude.

["W. Curt Deegan" <WWWR@xxxxxxxxxxxxx>]

As a part of my radio routine, I check the four local IBOC stations to see 
if they are on or off IBOC mode.  The process is to run a spectrum scan of 
each, making it easy to see when the IBOC sidebands are there and when they 
aren't.  Normally three of the four are operating in IBOC mode and one has 
not been since June, '05.

Yesterday the spectrum scan showed that WWNN 1470 Pompano Beach, FL, had 
reduced sidebands at noontime, which returned to normal by mid afternoon.

Is there a reduced sideband mode for normal -- or at least designed -- 
operation of IBOC?  Was this instead, some local operating situation which 
is not normal?

I had seen this in the past but attributed it to daily reception 
conditions.  I have been watching more closely lately and now know that is 
not the case.  The most obvious indication of this is that the primary 
analog signal is of normal amplitude, it is only the sidebands that are 
reduced.

I added an image of the spectrum scan to my southeast Florida IBOC status 
web site -- link below -- for comparison with the usual on and off 
modes.  Look at the last three scans, which are for WWNN.

Any thoughts on this?

Curt

-------------
W. Curt Deegan
Boca Raton, (southeast) FL
[Ten-Tec RX-320D; LFE M-601; GAP DSP]
http://ScooterHound.com/WWWR/radio/sefliboc.html



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