[IRCA] 1610 Test signal.

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

Jim and all,

I was indeed out of my depth.  Thankfully a helpful associate gently 
explained the error of my thinking.

I now appreciate how a fixed 1 kHz tone modulating a carrier produces 
the appearance of steady carriers 1 kHz either side of the nominal 
carrier.   Now that I've seen it, next time I'll know what I'm seeing.

I am back to what I thought last night before I began thinking too 
much.  There is a 1 kHz tone modulating a carrier on 1610.03 kHz, 
origin uncertain, but less so than a day ago.

My apologies to anyone I confused with my own confusion.

Curt



At 06:58 PM 11/29/2006, you wrote:
>Jim,
>
>I'm probably out of my depth, but it seems to me even a full double
>sideband signal would have only one carrier against which a BFO could
>interact.  That being said, tuning to the three frequencies in CW
>mode would not produce a beat note on each sideband, only on actual
>carrier frequencies.
>
>It is harder to discern beat notes from modulation in USB/LSB mode
>because both the beat note and modulation can be heard and are 1
>kHz.  In CW mode only the beat note is heard and there are three
>distinctly separate ones on the 1609, 1610, and 1611 frequencies.
>
>I even fired up the big set to test my theory since some radios don't
>implement a true CW mode.  The NRD-535D confirmed what I had been
>seeing with the RX-320D and Spectran, three carriers.
>
>There are a bunch of tones heard in AM mode, around what I think are
>three carriers, accounting for both modulated tones and heterodynes
>produced by the beating carriers.  As I've mentioned, I get tones
>every 1 kHz from 1607-1613, in AM mode.
>
>I have also observed that the carriers vary in strength independently
>amongst themselves, which would tend to suggest separate signals, not
>a common one.
>
>Last night there was one carrier at the times I checked and an
>impressed 1 kHz tone.  Tonight it sure seems to me that there are
>three carriers, possibly with 1 kHz tones on some or all and the
>resulting hets as well.  Also, I believe at some point last night
>there may have been three carriers -- reported by other -- but only
>for a short period, unlike tonight.
>
>Those are my thoughts right now but more thinking is certainly in
>order.  I'm probably all wet, so don't hesitate to set me straight.
>
>Curt
>-------
>W. Curt Deegan
>Boca Raton, (southeast) Florida
>[JRC NRD-535D; LF Engineering M-601]
>
>
>
>At 05:57 PM 11/29/2006, you wrote:
>
> >In Oak Ridge, Tennessee, the signal on 1610 is now
> >(6 PM) quite clear.  Looking at the RF (at IF) on a
> >scope shows pretty full modulation.  Kicking in a
> >3 kHz mechanical filter allows one sideband at a time
> >to be lopped, yielding the "two-tone" pattern.  That
> >observation then concludes that this is a full-carrier
> >doublesideband signal.  Strength is similar to the
> >10 kW carriers on nearby frequencies but below
> >the level of the 50 kW signal in the low 1500s.
> >Some fading so it is not local to eastern TN.
> >
> >- JimT


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