I've got a Heathkit SB-102 that I'm working on making operational (problems with transmit, receiver works just fine). This model radio has a 9-pin Molex connector in the back, intended to connect an external auxiliary VFO.
By design, this feature is intended to support "split" operation -- listening on a different frequency from the transmit setting (much more different than the usual 1 KHz offset of the CW setting in this model family). It occurred to me to wonder, however, whether this external frequency input could be used to operate on bands outside the radio's normal complement of 80, 40, 20, 15, and 10m amateur bands. There are a number of other amateur bands available within this freuqency range (30m, for instance, as well as 17m and 12m) as well as bands outside this range that might be within the capability of the hardware (160m and 6m come to mind).
Is it possible to use the external VFO connector on an SB family radio to transmit and receive on amateur bands outside the 80-10m range, or unsupported bands within that range? Would it become possible if a bypass for the internal VFO (aka LMO) were installed, so the "primary" operation was controlled by the external VFO?