In addition to the residual carrier, the uBitx also has significant IMD and some opposite sideband,
though that should all be close in to your main signal and more or less legal anywhere AM phone is legal.
If you have been following this group much, you should be aware of issues with harmonics and spurs.
The harmonics will be dealt with by the LPF's on the output of your 500 Watt amp if it's any good.
Perhaps the v5 is sufficiently free of spurs, has that been resolved?? Spurs can be quite significant on v3 and v4.
The spurs can be lower than the transmit frequency, and so will be going out on the air.
I'd consider possible spurs to be the primary issue here.
At 500 Watts, I'd want carrier and opposite sideband and IMD issues to be resolved as well.
And would discourage the use of any external amp with a uBitx (especially at 500 Watt)
unless you have a spectrum analyzer and know how to use it.
When transmitting 5 or 10 Watts, the bonus signals can generally be forgiven.
Not at 500 Watts.
Jerry, KE7ER
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On Wed, Mar 6, 2019 at 09:06 AM, Mike wrote:
?I noticed that my New version 5 has poor carrier suppression. I noticed this when I ran my UbitX into my LDMOS amp and I seen about 10 watts out of carrier. I was wondering if it is due to a maladjustment in the BFO? The radio has very good sounding TX audio (especially with the IC7300 mic) and very good RX audio.?
?I also understand that the gain from the LDMOS amp is "amplifying" the problem (.5 watts into the amp gets about 500 PEP out).
?I am using the latest CEC 1.12 software
