Now I find this level of -25 dBc to be too high and I am considering just using the box as a Top band only TX as -40 dBc is just about acceptable.
Before I go further I am wondering if I have enough space in my layout to fit either a tuned driver anode or tuned PA grid L and C Tuned PA grid may be easier, but think the impedance may be to low when compared to the 22K resistor that is there.
I would appreciate others thought on the spurious levels and what you would consider acceptable?
I would consider -40 dB or below OK, that is what a Yaesu FT901 promises for example.
I never owned a Codar AT5, but many many decades back I recall hearing one way out of band, I can't remember what freq. (too long ago), but it was quite shocking.
That driver to PA design is really a bodge.
Tuned Anode to grid is the best way to go with either a tapped coil or switched C's. Tapped coil would be best.
It shouldn't take up any more space than an RFC, but you may be using mini RFC's.
You'll crack it, I am certain.
