I do not see how you can access the 6300,6500 with a nother radio like a ten meter HT and transmit on lets say 20 meters rebrodcasting what you transmitted on ten meters, that is true cross banding abd sky command on a ts 2000 is the only way I know to do it with radios without adapting other radios to it. Now you can transmit in 20 meters and receive on 40 meters, the person you are talking to would receive on 20 meters and transmit on 40 meters. . I believe you are not suspose to do that but not sure. I do not believe the 6700 witl do trues cross bandyou would have to link both scu and you might can d that with dax? still would have the same issues you have at fieldday with interference. I still say get a TS 2000 and the HT or mobil that is sky command compatable I had both and could set by the pool and work skeds on all the bands with my HT.
OTOH... I already sit by the pool with my iPad (from 18 different countries so far) as well as in Taxi's Hotel Rooms and other place and work DX and skeds via my 6700. No need to schlep an HT when I already carry an iPad anyways...
In fact, the intent of V2 WAN will be to totally eliminate the need for that HT with a Native Remote Capability...
So if he wNts that type of "cross banding" I did that in 1979 with my yasu twins and you can do it with almost any modern radio with two vfo positions, the real issue is using one antenna which will work both bands or like all radios with two antenna connection the transmit band on one antenna and recieve on another.
But the 6300, 6500 will not cross band repeat.
Hams have been doing "crossband operation" since the beginning of radio because they had separate receivers and transmitters. THe transmitters were usually home built "spark gap" or later crystal controlled transmitters that were good for only a single band. Or a ham might only be able to afford one or two crystals for the transmitter.
Hams used to call CQ and then tune the whole band, looking for a call from another ham whose single crystal might be 100 KHz away from the calling frequency. Sometimes a ham might call CQ on one band and listen on another in order to take advantage of propagation and rig differences. This early "crossband operation" was standard procedure for many decades until multiband transmitters, and later multi-band transceivers became the norm.
Hams have been doing "Remote operation" for decades also, using a UHF linking receiver and transmitter (or dedicated phone line). Extensive regulations were published by the FCC to govern these operations, which were expensive, rare, but effective in many parts of the country.
In the late 60's early 0's hams began to take advantage of changes in commercial VHF/UHF standards and picked up lots of inexpensive surplus business band/public service equipment and started pioneering "repeaters" -- a receiver/transmitter combination that would "repeat" someone's mobile signal from a much taller tower or mountain top. This combination, self-contained system, known as a "Repeater" became the norm in the 70's, also heavily regulated at first by the FCC.
When multi-band and later "dual-band" rigs (capable of simultaneous operation on BOTH bands) were introduced, some industrious hams figured out how to forge a manual link between the two sides of their rigs and do "crossband linking" in order to access their car or base station dual band rig with their multi band or dual band HT. Manufacturers took note, and when FCC rules were relaxed, began incorporating this capability natively into their rigs.
Then Kenwood introduced the TS2000, one of the first rigs that included not only HF-6 meters, but also a VHF and UHF module that was able to link to it's HF module and "Crossband repeating" became possible from within the same rig.
This activity became popular among many new hams who shorted the term to "Crossbanding" or working "crossband," apparently unaware of the previous usage of the terms. (or perhaps out of linguistic laziness.)
This is another example of how younger and newer generations of hams often use the same or similar terminology to mean vastly different things. (I will never fully adjust to the 11 1/2 meter terminology of "working conditions" to refer to my "rig and antenna!".... but I guess that makes me an old timer!)
The bottom line is that I can forsee the possibility of the 6700 doing "Crossband repeating" at some point in time because it has dual SCU's. But the 6500 & 6300 would probably have a more difficult time doing that. But "Crossband operation" - i.e. transmitting on one band and listening on another -- is possible on many, if not most modern rigs, including all of the flex rigs. Full-duplex crossband may be possible if the SCU and Transmitting sections are able to run simultaneously. I believe that in previous threads Steve said this MIGHT be possible, given enough isolation between transmitting and receiving antennas. But it is a project for another day, a long way off.
The neat thing is that this may just a "simple matter of software!" hi hi!
73 and enjoy these marvelous rigs that keep evolving with more and more capabilities!
Ken - NM9P