Edit:
I got my hands on two new in box 75-160 handhelds. They are FM, and the channel frequencies are:
Channel 1 - 27.095 MHz FM
Channel 2 - 27.145 MHz FM
Channel 3 - 27.255 MHz FM
The FM deviation appears to be 5 kHz. I checked using a multi-norm handheld set to the Poland band plan - AM/FM CB and was able to hear 27095 pretty much loud and clear on 27.100 MHz Channel 12R. Same with 27145 coming in nicely on 27.150 MHz Channel 16R.
Channel 3 is indeed 27255, CB channel 23 and I was able to hear RCRS data bursts on it. Apparently a single-channel variant the Midland 75-150 FM Walkie-Talkie was also sold. It advertises 1/2 mile range just like the 75-160 3-channel 27MHz FM walkie talkie box does.
So I went on a bit of an eBay binge, ended up ordering a Maxon 49-HD 49MHz 5-channel FM walkie talkies and RadioShack TRC-512 / TRC-503 5 channel 49MHz handhelds, 27MHz paging transmitters (RadioShack PG-80, and Command Communications PrivatePage PS2000AN pager - which is similar to the RadioShack PG-99 pager 17-6020)
…and pair of Midland model 75-160 3-channel 27MHz FM Walkie Talkies.
FCC ID F9GRC-3000 F9GRC3000
These indicate FCC Part 15 compliance on the back of the radios. 3 channels, indicated as 1/2/3 on the side of the radio.
FCC type acceptance date is 13 June 1991 - formatted as 1991-06-13. FCC rule Part 15C, Grant Note 37. Operating frequencies 26.96 MHz - 27.27 MHz.
FCC Grant Note 37:
I found a thread on an Italian language forum about it being a “civil band” or “urban band” (CB radio) walkie talkie with 2-4 km range and it likely operating on 27.120 MHz. Nothing is said about the 3 channels.
https://www.elforum.info/topic/98890-statii-portabile-walkie-talkie-midland-cred-ca-destul-de-vechi/Since these aren’t 49MHz handhelds and they’re FM mode they are intriguing to me. They appear to be early 1990s vintage.
One thing is the operating band for 27MHz Part 15 has changed very slightly over the years. Now it’s 26.96 MHz - 27.28 MHz. Old versions are 26.97 MHz - 27.27 MHz, 26.96 MHz - 27.27 MHz, etc.
26.960 MHz - 27.270 MHz is the one that matches with this radio. I know 15.227 is the same as 49.82-49.90 MHz in that it’s 10,000 microvolts/meter at 3 meters.
These radios are listed as 1/2 mile range radios, which to me says more than the 12 microwatts or whatever 10,000 uV/m at 3m is. Seems more like a 50mW to 100mW type rig…like the old 100 milliwatt single channel RadioShack handheld CB rigs TRC-91 or TRC-92 and several others.
On another tangent, these could be turned into legal 11m 27MHz Part 15 beacon transmitters. A blurry image of the radio’s PCB clearly shows a set of 3 crystals and another set of 3 crystals, likely a transmit/receive pair for each of the 3 channels.
Once the radios arrive I’ll figure out what channels these things are actually on. Since the operating band is 26.960 - 27.270 MHz, I’m assuming some combination of the RCRS channels…26.995 MHz, 27.045 MHz, 27.095 MHz, 27.145 MHz, 27.195 MHz and 27.255 MHz. Avoiding 27.255 would make sense but who knows.
Since it’s Part 15, in theory, it could be any 3 frequencies in the 26.96 to 27.27 MHz range, 27.120 MHz, 27.240 MHz and 27.250 MHz or whatever.
Hopefully I’ll be able to update this thread with another piece of 27 MHz walkie talkie history. Now that FM is legal on Part 95 Class D CB radio, regular CB channels would be okay, but the RCRS channels are better for a potential beacon project.
I’m interested in knowing what, if any difference in the associated Part 15 section 15.227 (47 CFR 15.227) in effect when these radios were approved.
Also, what does this mean? Grant Note 37
FCC Grant Note 37
FCC Grant Note 37 signifies This device has shown compliance with new rules adopted under Docket 87-389 and is not affected by Section 15.37, transition rule
Here’s FCC Docket 87-389
https://docs.fcc.gov/public/attachments/DOC-342985A1.pdfDoes anybody have a copy of Part 15 as it was in 1991?