[Elecraft] KX3 booster

[Jim Brown]

On 11/5/2018 6:49 AM, Petr, OK1RP/M0SIS wrote:
> I am looking for something cheap but reliable and found this small toy:
> http://www.rmitaly.us/index.php?main_page=product_info&products_id=128
>
> The big disadvantage is that T/R switching is RF VOX by relays (no QSK
> available on CW)
> and second complain lack of output band-pass filters bank.

That's why it's cheap -- a lot of the parts are missing. It's quite 
normal for power amps to generate strong harmonics -- 5dB down is common 
for the second harmonic -- so they must be filtered by an output 
network. Solid state amps without tuners have networks that match to 50 
ohms. Tube amps use either Pi or Pi-L networks that are tunable.

73, Jim K9YC