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That entry was not updated , only talking about FM mode , (fw 1.3.1) , now from 1.4.0 onwards , we have FM/AM/USB/LSB/DSB and we also recovered CTCSS and ROGET beep , from n_220507 - And i added also some pictures to make it more user friendly

Brumi-2021 2022-05-08 01:05:54 +02:00
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Microphone-Tranceiver.md

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The Microphone App provides a Narrow band FM transmitter application, that allows the transmission of voice and when not transmitting allows you to receive in a simplex way if configured.
The Microphone App provided till firmware version 1.3.1 a Narrow band FM transmitter application, that allows the transmission of voice and when not transmitting allows you to receive in a simplex way if configured.
From firmware version 1.4.0 onwards, it has been added added some other additional analogue mod(TX) /demod (RX) FM/AM/LSB/USB/DSB.
## Key Controls
* **MIC. GAIN:** Cursor selection and use rotary encoder is used to select a fixed gain of x0.5, x1.0, x1.5, x2.0. The setting needs to be selected based, on the Microphone used which is connected via the Headset/ Microphone socket (standard smartphone 4 segment 3.5mm connector). The sensitivity of the microphone is shown on the lefthand side and should be configured so the range is green for most of the audio and never hits red to limit over deviation of the signal.
* **MIC. GAIN:** Cursor selection and use rotary encoder is used to select a fixed gain of x0.5, x1.0, x1.5, x2.0. The setting needs to be selected based, on the Microphone used which is connected via the Headset/ Microphone socket (standard smartphone 4 segment 3.5mm connector). The sensitivity of the microphone is shown in a vu-meter on the lefthand side and should be configured so the range is green for most of the audio and never hits red to limit over deviation of the signal. (see annexed image)
Note : this mic GAIN , is scaling the captured audio samples, therefore it will help to adjust properly the modulation index ,when we have a correct audio mic input. But if we are already saturating the ADC inputs (talking too close to the mic) , it will not help us so much to reduce that ADC input distortion , because the scaling is post ADC stage) .
![image](https://user-images.githubusercontent.com/86470699/167274133-375621ba-f615-427f-8121-2353a3095069.png)
* **F:** This field set the Frequency for the transmission.
* **BW:** This field sets the Band Width of the transmission under normal conditions from 0-150 kHz.
* **BW:** This field sets the +/- FM Frequency deviation (adjustment range 0-150 Khz) .
(WFM systems usually +/-75 Khz, NFM : a typical VHF/UHF two-way radio signal is using 5 kHz peak deviation)
That parameter , is directly related to the transmitted channel spectrum (see Carson's bandwidth rule)
* **GAIN & AMP :** Is set for TX_GAIN (IF) and (0-47) and TX RF AMP 0dB or 14dB.Node transmission gain , to all modulation systems from fw version 1.4.0 onwards , FM/AM/LSB/USB/DSB)
* **MODE :** Selection TX modulation type (FM/AM/USB/LSB/DSB)
![image](https://user-images.githubusercontent.com/86470699/167274656-e7eb95a3-ef4a-4820-8f75-2f51413a7406.png)
* **GAIN:** Is set for LNA(IF) and (0-47) and AMP 0dB or 14dB.Node mode is set to FM only.
* **TX Activation:** Field can be selected for one of three settings. Off, PTT, AUTO. In the PTT setting, the PortaPack will transmit when the TX button and the bottom of the App screen is pressed on the touch screen. In AUTO the Receiver section below is not active, but the triggering is set by the following 3 settings.
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* **DEC:** This is the decay time of the microphone audio signal falls below the threshold level be for the transmission is stopped (0 to 9999mS). Lower decay avoids silence at the end of the message but might cut you off in the middle of a sentence. Adjust levels depending on your speaking habits.
* **TONE KEY:** The Tick box next to “Roger Beep” can be selected with effort with cursor or better to select with touch screen. This will add a roger bleep if enabled. Note the level of the Tone % compared to the Microphone setting is set in Options >Audio.
* **TONE KEY & CTCSS (only available in FM mode) :** The Tick box next to “Roger Beep” can be selected with effort with cursor or better to select with touch screen. This is offering to the user , the ability to add to the mic voice , a single continuous specific frequency sine tone , that could be a subcarrier above audio bandwidth to activate ham repeaters , or just add it as CTCSS (Continuous Tone-Coded Squelch System) Note the level of the Tone % compared to the Microphone setting is set in Options >Audio.
RX audio listening: The Tick box to select this item is difficult to select with cursor having to go down and up though item, and with some luck you may enable the box. It is better to select from the touch screen. If this is enabled then it will turn on the Audio Receiver and with the following setting will allow you to listen to a receive channel when not transmitting. The TX-RX timing gap is not known. The frequency can be set separately to that of the transmitter section above. The following setting can be applied to the receiver.
![image](https://user-images.githubusercontent.com/86470699/167274573-14fcc124-5a0d-4dff-94a5-11e2c62b583c.png)
* **FM RX BW:** The is the narrow band FM Receiver Band Width setting. It can be set to either 8k5kHz,11Khz or 16kHz.
* **ROGER BEEP :** This will add a roger bleep if enabled. (note , currently only available for FM / AM / DSB)
* **RX audio listening:** The Tick box to select this item is difficult to select with cursor having to go down and up though item, and with some luck you may enable the box. It is better to select from the touch screen. If this is enabled then it will turn on the Audio Receiver and with the following setting will allow you to listen to a receive channel when not transmitting. The TX-RX timing gap is not known. The frequency can be set separately to that of the transmitter section above. The following setting can be applied to the receiver.
(Note the demodulation type , is linked automatically to the TX Mode type : FM/AM/USB/LSB/DSB)
* **FM RX BW:** The is the narrow band FM Receiver Band Width setting. It can be set to either 8k5kHz,11Khz or 16kHz.(this option is only applicable and available to the FM reception)
* **F:** The frequency can be set in the usual way with text pad when selected
* **SQ:** This can be set between 0 and 99 typically 50 is threshold.
* **GAIN:** The gain setting of LNA(IF) (0-40) VGA(Baseband)(0-62) and AMP 0=0db or 1=14dB.
* **GAIN:** The RXgain setting of LNA(IF) (0-40) VGA(Baseband)(0-62) and AMP 0=0db or 1=14dB.
Note this application while performing a transmit function may well over deviate and generate unwanted harmonics.