A recent comment asked about SSB capability for the Redsun RP2100/Kaito KA2100. The '2100 does not have SSB built in, but includes an IF output jack. It's possible to make or purchase a device that receives the IF output from the radio and decodes it as an SSB signal. An SSB decoding device for the '2100 is available for purchase on eBay.
If any readers have questions or comments about using SSB signals via the '2100, you're welcome to comment here.