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new Midland GMRS mobile

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SigIntel8600

SigIntel8600

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Thanks for the info. I will be keeping a close eye on this one. Anyone care to take a guess on price?
 
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Project25_MASTR

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Repeater capable. WTF is a 10K5 emission designator. That would make it something like 2.0 kHz deviation.


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RakkFO

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Emissions Designator 10K5F3E
10K5F3E--
Bandwidth: 10.5 kHz

Modulation Type: [F] Angle-modulated, straight FM

Modulation Nature: [3] Single analog channel

Information Type: [E] Telephony, voice, sound broadcasting

Modulation Type Notes: F3E FM speech communication – often used for marine radio and many other VHF communications

Emissions Designator Lookup

The Emissions Designator 10K5F3E signifies a wireless radio which transfers data over a modulated wave using Single analog channel signal. This signal transmits at a 10.5 kHz [10K5] maximum bandwidth.


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ipfd320

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I Hate to Burst the Bubble on this But That Radio is the Slimmed Down Version of This

Blackbox UHF Mobile Radio

Made By Klein Electronics---I Have the Blackbox Uhf when they 1st Came Out Approximately 5 Yrs Ago--Its a Great Radio for What I Use it For / Never Had a Problem With It
 
bill4long

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W5PKY said:
Repeater capable. WTF is a 10K5 emission designator. That would make it something like 2.0 kHz deviation.


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Click to expand...

Looks like they designed it to work with the shared FRS/GMRS frequencies which are 10.5K bandwidth and didn't care about the fact that the GMRS-only frequencies can legally do 16K bandwidth. Oh well. That's kind of a bummer if you care about 100% modulation compatibility with 16K systems and radios. These new radios will sound like 50% modulation to those.

I'll stick with my GM-300 radios
 
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bill4long

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ipfd320 said:
I Hate to Burst the Bubble on this But That Radio is the Slimmed Down Version of This

Blackbox UHF Mobile Radio

Made By Klein Electronics---I Have the Blackbox Uhf when they 1st Came Out Approximately 5 Yrs Ago--Its a Great Radio for What I Use it For / Never Had a Problem With It
Click to expand...

And that radio looks like this radio:

https://www.amazon.com/TYT-TYT-TH-9000D-Two-Way-Radio/dp/B006QMM9XM

Both are probably made by TYT and licensed to Klein and Midland. These TYT radios are SDR radios and for the most people require simple firmware and filtering changes to made them work properly on a given VHF/UHF band. The TYT-9000 UHF radios already work just fine on GMRS, but they are not type accepted for Part 95. Most likely this new Midland is a licensed OEM version from TYT with the proper firmware changes to limit frequency/channels. Wouldn't be hard to determine if I had one my possession.
 
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Project25_MASTR

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bill4long said:
Looks like they designed it to work with the shared FRS/GMRS frequencies which are 10.5K bandwidth and didn't care about the fact that the GMRS-only frequencies can legally do 16K bandwidth. Oh well. That's kind of a bummer if you care about 100% modulation compatibility with 16K systems and radios. These new radios will sound like 50% modulation to those.

I'll stick with my GM-300 radios
Click to expand...



If you look at the formula the FCC has written for calculating designated in Part 2.202. It tells me that either it's not modulation a full 3.125 kHz (not even 3 kHz) or the deviation is actually between 2.125 kHz and 2.25 kHz.

FRS allows for a 2.5 kHz deviation. So they are shafting the consumer on the the bandwidth.
 
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n1das

n1das

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bill4long said:
Looks like they designed it to work with the shared FRS/GMRS frequencies which are 10.5K bandwidth and didn't care about the fact that the GMRS-only frequencies can legally do 16K bandwidth. Oh well. That's kind of a bummer if you care about 100% modulation compatibility with 16K systems and radios. These new radios will sound like 50% modulation to those.

I'll stick with my GM-300 radios
Click to expand...

"Wide" bandwidth on the GMRS primaries authorized 20kHz bandwidth on a 25kHz spaced channel. Most Part 90 gear in "wide" mode operates with 16kHz occupied BW while still operating on a 25kHz spaced channel. Ancient Part 90 equipment operating at 20kHz occupied BW did 5 kHz deviation with highest modulation frequency of 5 kHz (20K0F3E). Newer Part 90 gear with 16kHz OBW does 5 kHz deviation with a highest modulation frequency of 3 kHz (16K0F3E).

The current crop of 22-channel bubble packs operate in narrow mode on all 22 channels, with 2.5kHz deviation with a highest modulation frequency of 3.125 kHz, occupying 11.25 kHz of spectrum (11K2F3E), which fits into a 12.5kHz spaced channel. IOW, the bubble packs are operating narrow (11K0F3E) on the GMRS primaries, and they are legal.

GMRS can legally operate "wide" or "narrow" on the GMRS primaries. I prefer to go with the flow of Part 90 and operate narrow on the GMRS primaries because I'm using good Part 90 commercial gear. All of my adjacent channel splatter problems from local bubble packers 12.5kHz away from the GMRS primary channel I'm using went away completely as soon as I made the switch from wide to narrow mode. A few simple programming changes was all that was required. Note that all Part 90 commercial gear manufactured since about 1997 has been required by FCC rule to include narrowband capability. Any used Part 90 gear less than 20 years old will have narrowband capability. My repeaters benefited too by switching them from wide to narrow. My repeaters no longer got hammered by FRS activity local to the repeater on the upper FRS channels adjacent to the repeater input. Operating in narrow mode tightened the receiver up. I noticed no difference in coverage by switching them to narrow.

Since the Midland radio looks like it is based on a commercial design for Part 90, I'm not surprised it's narrow-only.
 
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