voice frequency rounded

ge0rg / aprsdroid

APRSdroid - Geo-Location for Radio Amateurs

https://aprsdroid.org/

GNU General Public License v2.0

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voice frequency rounded #259

Open iddq opened 4 years ago

iddq commented 4 years ago

if the voice frequency is 145.6875 then it will be 145.688 in the message,

ge0rg commented 3 years ago

Excellent find! I'm not quite sure how to best solve it, though.

The APRS Freq spec says the format must be FFF.FFFMHz, so I must not send longer frequency values. The options on the table are:

round down instead of up (i.e. make it 145.687)
limit the input box to at most three decimal places to enforce the specification
send whatever the user enters and violate the specification

penguin359 commented 3 years ago

There are many specifications that are violated in some way in practice. What's used in practice is probably best to follow. I believe my FTM-400 has this capability. I'll try testing it to see how it responds to such a frequency. If at least two different vendors do this, then it's a standard, no?

ge0rg commented 2 years ago

Any news on how real devices treat that?