Hey!
So, now I got one of those Chinese DSP radio receivers, XHDATA 808, which can receive shortwave bands in the range 2...29 MHz, medium wave, and long wave. It can demodulate SSB, switcheable LSB/USB.
I am interested in all of the bands, but particularly HAM radio SW, and generally LW - with lower priority if it's too effortful to get something there...
But it would be nice to cover all those bands.
With just the supplied wire antenna of a (very) few meters, I can get some reception, in the evening, on short wave, but very limited.
MW is just noise, LW is just dead.
The latter, LW, is especially mysterious because it's also dead with some 10ths of meters wire in my father's garden, while his fancy ICOM does get some clear stations on LW with the same antenna. Sure I don't expect it to be as sensitive as the $$$$ thing, but totally dead? Hmm...
SW is pretty decent with the long antenna.
(btw, Germany does not have analog public broadcast stations on LW,MW,SW anymore, so I can only receive somewhat further away stations)
Which is why I guess it's worthwhile to build some indoor antenna, like those olden days wooden, diamond-shaped frame with "high frequency coil wire" around it or whatever.
Some people seem to like to use magnetic loop antennae, because they won't pick up all the electric noise a city is full of these days.
Then again, I was told, they are very narrow band, so I have to tune them properly in advance to probably pick up anything, esp. with a not very sensitive receiver - which is not great for manually scanning around to find some frequency where something's going on.
It doesn't have to be a passive antenna, I'd also build some amp behind it, but I, weekend soldering iron wielder, couldn't design it.
What would you say are good options here?
--------------------
Now, some "luxory" points, perhaps a bit much effort, but it's just some wild ideas:
*If* there is no way around the necessity to somewhat accurately tune the antenna to receive anything with my weak radio - it would be nice to have some way of measuring the resonance frequency of the thing (If a microcontroller can help there, I'm all ears).
Or super luxury: actually have some MCU set the proper settings on demand. I remember some project someone had a box of coils, capacitors of doubling values and bistable relays, to binary-switch in a frequency, but that was for SWR compensation or such for TX, I have no idea if this concept is viable here, also from accuracy for tuning standpoint.