WisyCom MTP61 - Audio Settings and Adjustments; Gain Adjustment Procedure; Channel Modulation Selection; Antenna Information

MTP61 mul-band miniature transmier
8
and activate Linear technology.
Linear is suggested for situations where spectrum is limited and frequencies need to be placed in
close proximity. This allows to operate EQUALLY SPACES frequency (placed every 400kHz (Wide-
band) or 200kHz (Narrowband | High Density)
Note that power consumption of L10 and L20 levels are comparable to the consumption of the level 100 mW.
Antenna to check what model of antenna connect. The model is reported on the antenna cap
(e.g. 950). This number is approx. the frequency of the middle of the band.
Label Band MHz
507 470-547
590 547-663
552 510-595
646 595-698
710 663-760
796 760-832
808 806-810
950 940-960
1K1 960-1160
1K2 1240-1260
NOTE: with increasing frequency the length of the antenna decreases (therefore use short antenna for high frequencies,
long antenna for low frequencies)
AUDIO
Gain to set the sensitivity of the audio input.
You can access this menu directly from the status menu by pressing the UP / GAIN button.
To help proper audio gain setting, an audio bar is supplied (with
maximum peak indicator) indicating the headroom to audio peak (0
dB , nominal deviation 40KHz).
Set the gain with the maximum input signal, avoiding the peak on
the audio bar.
TRY TO SETUP TO HAVE A MAX PEAK HOLD BAR CLOSE TO -6dB
Gain settings is from -20 to +26dB (1dB step).
Ch. Mod. menu defines the type of modulation between Narrowband or Wideband. This
reduces or expands the spectrum occupation of the MTP61 Transmitter.
When the transmitter is set to WideBand the audio bandwidth is limited to 20 KHz and the peak deviation is set to ±56
kHz so that the occupied bandwidth is approx. 150 KHz.
When the transmitter is set to NarrowBand the audio bandwidth is limited to 17 KHz and the peak deviation is set to ±35
kHz so that the occupied bandwidth is approx. 100 KHz.
Switching to Narrowband provides an additional 3dB of RF Sensitivity on the receiver.
Note: make sure to set the receiver channel to the same modulation setting of the transmitter.
Ex. Wideband or Narrowband.