Flightline FL-760A Frequently Asked Questions

DISTRIBUTORS, INC.
FL-760A FREQUENTLY ASKED QUESTIONS
Q: My radio works fine but people receiving my transmissions say my voice volume is weak.
A: You may need to go into the Setup Mode (power the radio up while holding down the MOD
button) and toggle to the Mic Sensitivity screen and adjust the mic bias level up. The Mic
Sensitivity control range is 0 – 80 and is defaulted at the factory to approximately 60 as a starting
level, because there is no way of knowing what kind of headset and mic will be used by the radio
owner.
Electret mics are probably most common these days, but for louder aircraft cabins a headset with
dynamic mic may be a better match. These mics require different levels of bias and different
usage techniques. Electret mics are for quieter cockpits and can usually be whispered into and be
heard, while Dynamic mics are typically in louder aircraft (helicopters, open cockpit and fabric
aircraft) and require the user to speak louder to generate the best mic audio level.
We would advise adjusting the Mic Sensitivity level up or down initially by a factor of 10 to start
with (if voice is weak at a level of 60, try boosting to 70 and transmit to someone listening on
another radio). If further adjustment is needed, it may take several hit-n-miss attempts with
smaller adjustments to land on the optimum level for your headset/mic and airplane. A headset
with an amplified dynamic mic is preferred and a windsock on the mic is also advised.
Q: The sidetone level is too low so I am not hearing my voice loud enough in my own headset
when I transmit. The intercom volume is also low.
A: Like practically all aircraft ATC radios, the FL-760A incorporates a Sidetone Amplifier that is
activated when you press the PTT switch. At that point, your voice signal from the Mic Audio line
that is feeding the radio transmitter is also routed through the Sidetone Amplifier and then back
into your headset so you can hear what you are saying in the high noise environment.
The built in two-place intercom system (ICS) that is featured in the FL-760A is simply using that
Sidetone Amplifier as an intercom and giving you the option of turning it on via a voice activated
trigger circuit (VOX) or a dedicated ICS PTT (not to be confused with your radio PTT). The
Sidetone Amp is pulling "double duty" essentially - it always activates to provide Sidetone when
you press the radio transmit PTT, but when you are not transmitting on the radio, it acts as a VOX
activated ICS or a PTT activated ICS.
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