Handheld and small table top

[RFI-EMI-GUY]

A wise man once said, if you wait until an emergency to use your radios, you will usually find that when there is an emergency that the radio doesn't work, or you don't know how to use it!

Very true. Your regular radio and your emergency radio system should be one in the same. Design to that end.

Adding digital to the mix, makes it even worse for reception.
Analog will get through where digital might not.

There was a penalty using Securenet DES CVSD because the amount of frames lost when a signal faded were significant. Intelligibility suffered. Later DES-XL fixed that penalty at the cost of some fidelity.

But this is no longer a problem with modern schemes. The new vocoders IMBE, AMBE and error correction schemes actually improve the signal reliability measurably. You get that wacky P25 "R2D2" audio but at a greater distance than analog.

 

[Project25_MASTR]

Digital schemes can cover up to 35% better than analog just because of the robustness of their modulation schemes and receivers which outperform analog in digital operation. Also when most hams give their opinion about analog 5 kHz deviation versus digital, they fail to remember 5 kHz deviation is not the standard upon which analog communications are measured anymore. 2.5 kHz which covers roughly 20% less than 5 kHz did.


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[drey7]

Thanks everyone for the feedback.

I've been checking into TYT MD-390 vs MD-398 and was told the following:

>The differences between 398 and 390 is that MD-398/368
>are 10 watt and one time slot for repeater , and MD-390/280/380/446 '
>are all 5 watt and two time slots for repeater

I can't seem to make sense of my google searches explaining the time slots. Can anyone please explain what that means?

By the way... looking into the licensing for those above that were concerned. I've no intention of using them illegally.

Thank you.