Repeater Planning Series Vol. 2: “The Six Most Common Mistakes" [Contains Stupidity]

[intermod]

Mistake #2: Ignore the 467 MHz "Uplink" Problem

You choose a unique repeater CTCSS / DCS / PL / Privacy code, but other incumbent repeater owners become unhinged and pissed off.  That is because signals from users trying to access your repeater are still being heard by the incumbent's repeater *receiver*.  Those signals don't activate the incumbent's repeater - but they still exist and can block or walk on the incumbent's users, particularly when the incumbent’s users are operating handheld radios.  CTCSS / DCS / PL / Privacy Codes, etc. only prevent inadvertent repeater activation - they cannot prevent uplink IX.

Clue - your repeater's transmitter is not causing the interference;  it’s your users' transmitters that are causing this type of interference. This cannot be fixed by making any adjustments to your repeater.  Of course.

[tcp2525]

The tried and true method is to time slice. Repeater A users get transmit time for even minutes and Repeater B users get to transmit on odd minutes. Of course this would be totally voluntary between the two groups. Just like the old land line days of yesteryear with the party line. If a dispute were to happen then would get their radios throttled using WWV as the standard. If all else fails, the offending mobile user takes a one week time-out .

In all seriousness, nothing to worry about as the percentages of interference will be minimal.

[intermod]

Excellent idea, but somewhat inconvenient.  But why not do real time-slicing?   If the FCC would permit DMR technology, it would provide two discreet channels/time-slices (slots) - one for each user group - to use *at the same time*, and would only require half of the standard GMRS channel.

Maybe I should not have mentioned DMR - it triggers some people.

[tcp2525]

55 minutes ago, intermod said:

Excellent idea, but somewhat inconvenient.  But why not do real time-slicing?   If the FCC would permit DMR technology, it would provide two discreet channels/time-slices (slots) - one for each user group - to use *at the same time*, and would only require half of the standard GMRS channel.

Maybe I should not have mentioned DMR - it triggers some people.

The great thing about the scenario you describe in the original post is 98.93736452367263554327% of all GMRS communications are generally radio checks, so interference is not an issue.