[JRC] NRD545 question,

[ChuckB]

Ben,

The only headway I have made with the TT "AM detection information 
function is that it will work only when the receiver is in AM mode.
While the receiver is in AM mode, I can send the TT command (AM 
dection status)to the receiver and I can see the response changing
as I send each request from TT0 to TT1 once in awhile.  As far as
I can tell, the status changes when the amplitude changes on the
AM signal.  It if is up there above S9 on the meter, it's TT1 and
if it's below it comes back TT0.  Sending the commands TT0 or TT1
to the receiver has no effect.

If anyone has further or different information, please feel free
to make it known.

Actually, I need a definition for Envelope detection and Synchronism 
detection.

Thanks

Chuck
ka4prf
Clewiston Florida

Ben Mesander wrote:

>> I tried changing the detection from envelope to sysnchronism, but
>> nothing happens.  when I request a status report "TT", I get back
>> a TT0 which means Envelope Detection.
> 
> 
> Try using ECSS-USB or LSB mode and see what TT gives back - I think that's
> what it is referring to.
> 
> I may be wrong, but I seem to recall that when receiving faint signals in
> ECSS mode, the receiver might switch back and forth between the two sorts
> (you might be able to simulate this by turning rf gain down some)
> 
> Let us know what you find out. I'm interested because I often reduce rf
> gain to reduce fading in AM recovery modes in the 545. If you turn down RF
> gain til the point where the S-meter just stops jumping around, I find the
> AM audio gets more intelligable. This is something that could be
> automatically added to a JRC control program...
> 
> --Ben
> 
> 
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