KMMJ-AM 750 Grand Island, NE is licensed as “Limited Hours” and I was
curious what exactly this meant. I inquired, a search of FCC
History/Archived Records was made and yielded this answer:

Way back on September 19, 1968, KMMJ was issued a telegram for presunrise
authority to commence operation with its licensed facilities at the local
sunrise time of cochannel station WSB, Atlanta. The authority was
conditioned subject to the outcome of a rulemaking proceeding (Dockets
17562, 18023, and 18036) relating to the “status of Class II stations [here
KMMJ] assigned to US I-A clear channels.”

Ultimately, the Commission settled on a 500 watt limitation on presunrise
operation nationwide. That was less than KMMJ’s regular operating power
(10.5 kW directional away from WSB). It appears too that WSB opposed
letting KMMJ keep the higher power presunrise authority (see paragraphs 31
and 32 at https://docs.fcc.gov/public/attachments/FCC-69-844A1.pdf , July
29, 1969).

The solution the staff came up with was to issue the license for KMMJ with
“limited time” of operation. In effect that replaced operation of the 500
watt presunrise limit applicable elsewhere in the country. See the
Memorandum of June 12, 1974:
https://apps2int.fcc.gov/admin/api/download/attachment/25076f9170b21d4a0170bfdedcc90169
..

The changes on the license were included on the next renewal of license
authorization (BR-676, dated May 20, 1977). The changes made KMMJ into a
“Limited Hours” station and specified the on-air times. As a practical
matter, however, KMMJ continued to operate unchanged. (This is the
origin of the comment in the AM Query: LIMITED TIME OPERATION: SEE BR-676,
MAY 20, 1977.) BR-676:
https://enterpriseefiling.fcc.gov/dataentry/api/download/attachment/25076f9170b21d4a0170c009b0480176

KMMJ is still licensed to operate in this manner.

It is likely that there is no other station in the country licensed in
this manner.
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