[ARC5] Off subject, BFO / sideband understanding help.

[Brooke Clarke]

Hi Skip:

If you had a receiver that had an IF bandwidth of 1 Hz then you could tune to the listed frequency and there would be a 
carrier.  If you tuned to the sideband where the ID was being sent you would see just the ID modulation.  I can do this 
with a spectrum analyzer that has a true 1 Hz bandwidth, see:
https://prc68.com/I/Spec_0004.shtml
The advantage in doing this is that when the Rx bandwidth matches the signal you get the best Signal to Noise ratio, 
i.e. you can hear weaker signals.

-- 
Have Fun,

Brooke Clarke
https://www.PRC68.com
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.

-------- Original Message --------
>     Besides maintaining the NDB at Deer Park, WA airport I at times “chase” NDBs just for entertainment and occasionally compete in contests.  I have in the past used my HRO-W and BC-453.  More recently a friend set me up with an iCom R-75 (1 Hz tuning steps) with a narrow band filter (7 Hz).  It works great but to use it one has to tune to either the USB or LSB where the ID exists. On the HRO I simply tune to the center of the carrier, turn on the BFO and read the ID.  I read and understand the ID information is contained in the sidebands.  I guess if the R-75 had a BFO I  could get the ID without tuning to the side bands (usually about +/- 1000 Hz or +/- 400 Hz (Canada)).
>     If someone could give me a short tutorial to better my understanding I would appreciate it.  Thanks.
> Skip Magnuson
> Spokane, WA
> <magnuson at mac.com>
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