Token
Member
Oddly enough yet again, I have a slightly different take on this topic. IF I read the OPs question correctly, he is asking why it is illegal to transmit on 11m band on HF radios that are designed for 10~160M. Well, if one puts on their wayback hat, they can see a time when 11M was included on all stock HF radios. I personally have a nice FT-101B (that I am selling BTW!) that has 11m right there on the band selector.
The FT-101B did not come able to transmit on 11M from the factory. The 11M band switch setting was receive only, the same as its JJY/WWV 10 MHz band selection. However, lots of people modified them to allow transmit on any band selection, and used them on 11M.
If you want to get to when 11M was a ham band, and some HF transmitters did ship with it built in, you have to go to well before the FT-101 series was even a thought. The FT-101 came out for sale to the US market in 1971, and 11M on a none part 95 accepted TX would have been long illegal. The US ham allocation for 11M (26960 to 27230 kHz) was short lived, from 1947 to 1958. US hams were originally given this band in 1947 as compensation for the FCC taking away the top 300 kHz (29700 to 30000 kHz) of 10M and the top 50 kHz (14350 to 14400 kHz) of 20M. This (11M) was a shared use band. In 1958 the band was taken from US hams and designated as Class D CB. Within 5 years there were more licensed CBers in this little 270 kHz chunk of band than there were licensed hams in all of their many bands combined (for a bandwidth of roughly 3 MHz on HF alone, let alone the bandwidth on VHF, UHF, and SHF).
While I never advocate repurposing ham bands (because I use pretty much all of them) and I do understand that CB can be a zoo at times, in this case it seems to have made sense, and the band become much more used under CB than it ever would have been as a ham band. Of course, the FCC should have chosen a different frequency range for this service, but it is what it is.
My FT-101B works perfectly on aam and all the other HF bands from 10~160 so that alone shows every HF radio COULD work on 11m, as well as other bands if they allowed it.
Not quite sure what you are trying to say here. Yes the FT-101 series does OK on AM mode, as do many ham transmitters of that time and before. But, AM is not a requirement for CB at all. SSB is, and has been for a long time, very active on 11M. And some legal CB radios, the exceptionally good Stoner Pro-40 and the Browning SSB-15 as examples, do not even include the AM mode.
T!