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Jon

I would say the uBit is probably the easiest of the lot for a new user to use, although it lacks some of the features of the SDRs.? It's a much less expensive radio than the sBit.? Since you say you won't be operating portable, and you do have a resonant antenna system, you can get away with just an AC power supply and a key to start with.? You might be able to build a suitable power supply, or buy something ready made.? I'm in Canada, so I don't know what it's like to get things locally in India.? It's easy to add a few features later to the radio, after you get familiar with it.? The ones I would suggest are a memory keyer, an audio filter, and an AGC system.? The uBit isn't really designed to handle some of the more modern things like FT8, etc., just plain old CW and SSB.? It may be possible to use these with a sound card and a computer.? I haven't tried this.

With either of the SDRs, you are looking at updates, especially with the zBit, as it is quite new.? You won't have this issue with the uBit.

I have all 3 of these radios, so I do have some experience.

Sotabeams has a good audio filter at a cost of about ?25.00, plus shipping.? Hamcrafters (K1EL) has the K16-EXT keyer, although at the moment his situation is unsettled, as things are uncertain in the USA with some of the president's ideas on international trade.? A lot of his raw materials are imported.? Both of these can be built into the uBit, although the keyer has some practice features that make it very useful on its own.

Your comments about 807 tubes bring back over half a century of memories with 1625s (the 12 volt version of the 807) and WWII surplus equipment.? I used a 1625 in my first transmitter, back in 1970.

Gerry Sherman