Re: [IRCA] Sync Detection Question

["Chuck Hutton" <charlesh3@xxxxxxx>]

J.D.:

If Norway was strong enough to lock the sync det (which it should if you
were able to easily hear their carrier while tuning in sideband mode),
there's no way the sync detector should make all the audio go away.
Something seems to be broken.

That's all based on you having enough carrier to lock the sync detector.
Have you tried it on a signal that is a bit stronger? If the audio
disappears with it, I'd put it in a box and send it to Drake.

If there's not quite enough signal to lock the sync det, a normal sync det
would mute the audio and revert to normal AM envelope detection. I'm not
sure what Drake's design does. 


Chuck

-----Original Message-----
From: irca-bounces@xxxxxxxxxxxxxxxx [mailto:irca-bounces@xxxxxxxxxxxxxxxx]
On Behalf Of J.D. Stephens
Sent: Monday, January 16, 2006 9:32 AM
To: irca@xxxxxxxxxxxxxxxx
Subject: [IRCA] Sync Detection Question

I have noticed during my recent chase for
Trans-Atlantic Mediumwave stations, that when I use
the Synchronous Detector on my Drake R-8, instead of
enhancing the intelligibility of the transmissions, it
has the opposite effect.  

Case in point:  during the recent appearances of
Norway-1314 here at my QTH is North Alabama, when I
engaged the Sync Detector, instead of helping to bring
the signal up from the noise floor & adjacent channel
interference, it eliminated most (and sometimes all)
of the audio - leaving pretty much only the strong
carrier.  When I disengaged the Sync Detector, the
audio was clearly intelligible - although I had to
deal with the heavy QRM from stations on either side.

Obviously, hearing Norway without using this feature
on my receiver is possible - no doubt due to its very
high transmitter power.  But, for the less powerful TA
stations/signals I am trying for on Mediumwave, I am
concerned about Sync Detector's  detrimental effect on
the audio.  

Does anyone have a tip on how to better use Sync
Detector when chasing TA mediumwave stations?  Am I
doing something wrong?

Any help would be most appreciated.

73,

J.D. Stephens
Hampton Cove, AL, U.S.A.

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 
_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://arizona.hard-core-dx.com/mailman/listinfo/irca

Opinions expressed in messages on this mailing list are those of the
original contributors and do not necessarily reflect the opinion of the
IRCA, its editors, publishing staff, or officers

For more information: http://www.ircaonline.org

To Post a message: irca@xxxxxxxxxxxxxxxx

_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://arizona.hard-core-dx.com/mailman/listinfo/irca

Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers

For more information: http://www.ircaonline.org

To Post a message: irca@xxxxxxxxxxxxxxxx