Dan adds updates to his Malahit SDR and variant reviews

Many thanks to SWLing Post contributor, Dan Robinson, for the following update to his previous post regard the DSP-2 and HFDY Malahit SDRs: Malahit and HFDY Updates by Dan Robinson HFDY CLONE: As noted by a reader in comments, the Chinese-made HFDY leaves out a large portion of the military AIR band, with no coverage from 250MHz to [...]