Re: LF: Signal bandwidth in Op32 LF

[Chris Wilson <dead.fets@gmail.com>]

Hello Andy,

Could  this  in any way supply a reason for me seeing the odd dead FET
when  running  OPERA  and  never  when  running WSPR? I always had the
feeling  that the fact OPERA stops and starts so many times in 32 mode
that  it  was  a  cause  of  an occasional glitch that blew the FETS in my 
Class D
amp... To be honest it's the main reason I rarely TX with OPERA on LF.
The  amp  is  permanently  powered,  the exciter, normally my U3S then
stops  and  starts whatever mode is selected. With OPERA I think a FET
will usually go at the START of one of the  TX cycles, not at the end.

Thanks. 2E0ILY

Saturday, September 29, 2018, 9:42:10 AM, you wrote:

> If you stop and start a divider, the phase jumps about randomly. 
> Each time you start the divider, its output signal starts up in a
> differnet phase to what it would have been if left running


> To achieve phase coherent, you must keep the divider running and gate the 
> OUTPUT separately


> This issue is a problem with beacons in general that employ FSK
> keying for their CW ident.   If they adopted on-off keying, then
> long term integration cold take place though the keying cycle.  But
> unfortunately, IARU (or whatever organisation that tries to mandate
> these things), appear to require FSK keying.  SO most beacon keepers
> comply.   (I don't, the Bell Hill microwave beacons, GB3SCx all use on-off 
> keying)
> Andy
> www.g4jnt.com





-- 
Best regards,
 Chris                            mailto:dead.fets@gmail.com