"mike maghakian" wrote in message
...
it was 0300, and reception is a mess unless you have a satellit 800 with
the fabulous state of the art drake sync detector

Reception is really a mess if you have two or more stations of roughly equal
strength on the same channel, which is what I reported to be the case in
Toronto. No receiver is going to sort that out.


nothing less than a drake selectable sideband sync as in the 800/SW8/R8B
will handle a mess like that. all I had to do was PUSH A BUTTON.

Like I said above, no receiver ...... Sharp filters will allow you to tune
to favor one sideband over the other. If your interference is primarily due
to a strong station on one of the adjacent channels, then selecting the
opposite sideband will help. If there are much stronger stations on both
adjacent channels, it won't do much - just increases the possibility to hear
the desired modulation when the adjacent interferer is at low modulation,
i.e., during pauses, quiet musical passages... But when the interference is
co-channel, no amount of filtering nor sync detection is going to pull the
desired signal out of the mess.

Radio Melodia has a history of being variable in frequency - witness the
heterodyne I hear of a few hundred Hertz. One of the equally strong signals
is off frequency and one of them is unstable because the pitch wanders. If
you do not hear this het, then you do not have the co-channel interference I
receive in Toronto. Your Sat 800 would do no better on R. Melodia here than
my DX-394! Antenna directivity that can discriminate against the
interferer(s) would be needed by all radios.

Selectable sideband synch AM detection does not magically recover modulation
from interference. Its main benefit is reduction of the distortions caused
by selective fading. Under co-channel interference between two
unsynchronised stations, the synch detector is going to be confused and lose
lock; I would expect a conventional envelope detector to do as well or
better.


I could use an R7 but that would take half an hour of fiddling. or I could
get an R75 and spend a week fiddling. but it 5 seconds the 800 had it
clear as a whistle

You exaggerate to the point of hyperbolic extremism! I would think that an
experienced user of each radio would settle on the optimum tuning for that
radio within a few seconds and tweak as conditions change.



the sat 800 is the most incredible low cost receiver ever made


I wouldn't know about its incredibility. At CDN$600, it hardly ranks as low
cost but that's a matter of definition (or personal financial position).





"Tom Holden" wrote in message
. ..
6140kHz. What time UTC? Where? Interference? In Toronto, 0100-0200UT it's
a mish-mash of at least two roughly equal strength stations offset by a
few hundred Hz.

Tom

"mike maghakian" wrote in message
...
I am listening to R Melodia from Bogata Columbia on 6180 ( with 1KW
according to the ILG database.)

talk, phone calls and music. big ID right before the hour.