The practice of briefly keying a microphone (hitting the push-to-talk/PTT button) to see if a repeater responds with a courtesy tone is commonly known as kerchunking (or ker-chunking) in ham-speak.
Don’t do it!  Don’t be a kerchunker, even though it’s often a quick and convenient way of verifying that you can hit a repeater.
For one, it is technically illegal.  All transmissions must be identified (with rare exceptions).  Just because you hear it happening a lot and the probability of getting caught is very low doesn’t make it right.
However, the main reason not to key a mic without identifying yourself is that it
is both annoying and disruptive.  It’s bad etiquette and almost always discouraged in published guidelines by the repeater owner.
If you really want to test your connection to a repeater, take the extra second to speak your call sign into the mic. Or say “testing”, followed by your call sign.  Or ID and ask for a signal report, which will give you even more info than just to hear a courtesy tone.
On a related note, if you want to test transmit power or SWR or something like that, consider using a simplex frequency to avoid tying up a repeater.

Stuck Microphone

While it’s mainly a local VHF/UHF communications issue, stuck microphones can be a real problem.

A stuck mic situation is when a radio operator inadvertently transmits for an extended time because they have unintentionally triggered the push to talk or transmit switch on their radio.  Consequences of a stuck mic range from being a nuisance to a life-threatening disruption. At best a stuck mic ties up a repeater or simplex frequency with dead air or noise.  At worst it blocks urgent communication during a disaster net or public service event.

One common stuck mic situation involves a mobile unit with the hand-held mic loose in the vehicle where it might get wedged into the seat to trigger the PTT button.  Best practice here is to keep the mic clipped into a hanger when not being used to minimize inadvertent transmission.

Keeping a mobile mic secure in clip minimizes chance of inadvertent keying.

Another common situation involves mic accessories with HTs during a public service event or emergency deployment.  When using a speaker-mic or headset, ensure that the PTT button is protected from accidental triggering.  Also, the Yaesu FT-60 is a wonderful handheld radio and many hams have them, but they (and others like them) have a squirrely speaker/mic jack that is prone to false triggers when the connector is not seated completely.  So make sure your accessory is connected securely and not prone to pulling out when the radio is clipped to your belt or in a pocket or something like that.

External mic or headset prone to false PTT triggers because of plug design on certain HTs.

In any case, awareness is our first line of defense.  Be aware that a stuck mic is a problem and that you might be the culprit.

Don’t be this guy!

Keep an eye on your transmit light to make sure it’s not on when Continue reading