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Advanced Menu Overview (RT 880)
🕑 Added 2025-09-01 01:49:23 +0000 UTCSPI Deferral
This setting defines the delay, in seconds, that the radio waits after a user action before saving changes to flash memory. Delaying writes helps extend the life of the flash storage.
Warning Indicator: While changes are pending, a red warning triangle appears on the display.
Important: Do not power off the radio while the warning triangle is visible. Either wait for the deferral period to expire or use the Shut Down menu option to safely save changes.
Tone Monitor Time
Specifies the duration, in seconds, that the CTCSS/DCS tone indicator remains visible on the display after the received signal is lost.
AM AGC Fix
Activates an additional level of automatic gain control (AGC) for strong AM signals, helping to prevent receiver overload and saturation.
Note: The effect is not immediate. Very strong AM signals may produce a brief buzz or crackle before the AGC adjustment takes full effect.
Noise Gate
When enabled, the Noise Gate mutes the speaker if external noise exceeds the Noise Ceiling setting in the Squelch menu, even when squelch is forced open (via squelch override or a Squelch setting of 0).
Purpose: Designed for use with very weak signals to reduce background noise.
AF Filters
Selects the audio filter combination for the receiver. Three filters are available: High Pass, Low Pass, and De-emphasis. Any combination of these filters can be applied.
FSK Mode: An additional setting designed for digital operation, such as APRS.
DTMF Deviation
Adjusts the volume of transmitted DTMF tones.
Note: The TX Deviation setting also affects DTMF volume. Both settings should be adjusted together for optimal results.
Repeater Tone
Sets the frequency (in Hz) of the single-burst repeater tone that is transmitted when the key assigned to send the repeater tone is pressed. The default frequency is 1750 Hz.
TX Deviation
Adjusts the amount of FM deviation during transmission, effectively controlling the bandwidth of your signal. The default value is 64. Values above 74 may cause distortion that is noticeable to listeners.
Subtone Deviation
Adjusts the level of CTCSS/DCS subtone transmission. Setting the level too high may make the tones audible during normal transmission.
Note: The TX Deviation setting also affects subtone volume. For optimal results, adjust both TX Deviation and Subtone Deviation together.
AM Hack Transform
AM Hack Displacement
(ALPHA 19+)
Fine tunes the AM TX "Hack".
AM TX is not even close to perfect, it's experimental and results will likely vary dramatically from user to user. These setting are designed to be experimented with by users such that good default values can be discovered.
Displacement: Adjusts the apparent volume or gain of the simulated modulation.
Transform: Adjusts the amount of offset applied to a simulated AM transmission.
Comments
Aat van den Bos
I switched SPI Deferral to 0. Allready ordered a new one on Ali :) Will try AM TX with two radios when the new one arrives.
Marcus Dudley
It might, but I'm reasonably sure each radio isn't individually calibrated. But I have no idea about the stock firmware, I don't use it. You'd have to refer to Radtel for the calibration procedures with their software.
Eric Bourlet
I may have screwed up. I have not loaded your firmware yet. What I did do is read the stock firmware from my 880g with the Radtel software then saved that to a different radio. Does that screw up frequency ,modulation...calibration? If it did is there someplace I can find calibration procedures to get my radio right. I can get access to a service monitor where I retired from. Sorry to go off topic here. Appreciate any guidance.
