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:[email protected]
|
