[CQ-Contest] 40m lower band edge SSB

Jim Brown k9yc at audiosystemsgroup.com
Wed Nov 2 00:21:23 EDT 2016

On Tue,11/1/2016 3:21 PM, donovanf at starpower.net wrote:
> 7127 is too low, 7128 should be ok.

Even 7128 is pushing it -- if you're TX with a 2.7 kHz filter and the 
low side of the filter is at 500 Hz, your RF -3dB points would be 7124.8 
- 7127.5. Add another 200-400 Hz for filter skirts to get down to -30dB 
re: PEP.

AND is if your power amp is clean -- I see far too many that are NOT, 
splattering another3- 5 kHz either side of THAT bandwidth. Those 
stations would have to stay above 7132 kHz!

73, Jim K9YC

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