The best strategy for these bands where i am constantly experimenting and trying new things

A designed antenna that will serve as his main 630m radiator, not only that but it can be used on 10m, 15m and 30m and 160m as well

Has been retuned to the new band, and now has VFO control at the 630m operating

Build a radio for the band of 630 meters, from 472 kHz to 479 kHz

Tuning the coil to resonance at 505 KHz would require approximately 575 pF of capacitance

I share some of my knowledge and experiences with others regarding the 630 Meter Amateur Band

Example of the use of a vertical loop antenna supported by trees in a heavily wooded area

The complete high performance 472 to 479kHz 630m Band, 5 Watts of linear output

Due to the increase of sunpanels and plc devices, the hf radio spectrum is more and more polluted, add to it that in nl there is certain group of sunpanel pioneers who consider themselves capable of installing these devices by themselve

It is a home brew WSPR beacon transmitter. It puts out 12 Watts

A southern avionics sac-ss250, 25 watt non-directional aeronautical beacon transmitter and antenna tuner in an on-line

Fixed coil + series variable capacitor

Antenna is four identical wire antennas connected in parallel at the feedpoint

630 meter class D Power Amp designed to produce 200 watts output into a 50 ohm load

Wspr is particularly interesting on bands like 630 meter

By combining all three Zepp antennas into a single antenna, this goal was achieved