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
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