The Transceivers where made fully open by removing coding diodes.
The testings are done with 50 Ohm dummy load, Revex W570 SWR and power meter and 13,8 Volt to the transceivers.
6 Meter
T8E T81E
50 MHz = 6,2 Watt 50 MHz = 5,0 Watt
54 MHz = 5,0 Watt 54 MHz = 5,5 Watt
60 MHz = 4,2 Watt 60 MHz = 4,0 Watt
62 MHz = 2,5 Watt 61,600 = 4,0 Watt Highest transmittable.
63 MHz = 1,5 Watt
64 MHz = 0,6 Watt
65 MHz = 0,2 Watt
66 MHz = 0,1 Watt
66,630 MHz = Highest transmittable (PLL unlocks above this frequency)
2 Meter
136 MHz = 5,0 Watt 136 MHz = 5,5 Watt
144 MHz = 5,5 Watt 144 MHz = 5,0 Watt
148 MHz = 5,0 Watt 148 MHz = 5,0 Watt
150 MHz = 4,5 Watt 150 MHz = 5,5 Watt
160 MHz = 3,8 Watt 160 MHz = 3,5 Watt
170 MHz = 3,2 Watt 170 MHz = 2,0 Watt
180 MHz = 2,2 Watt 180 MHz = 1,4 Watt
185 MHz = 1,3 Watt 185 MHz = 1,0 Watt
190 MHz = 0,7 Watt 190 MHz = 0,8 Watt
197 MHz = 3,8 Watt 197 MHz = 0,8 Watt
200 MHz = 3,0 Watt 200 MHz = 0,7 Watt
210 MHz = 5,0 Watt 210 MHz = 0,1 Watt
220 MHz = 5,1 Watt 220 MHz = Transmits but 0 power
225 MHz = 1,3 Watt 225 MHz = Transmits but 0 power
228,825 MHz = 1,3 Watt Highest transmittable. 229,975 Transmits but 0 power
1 Meter
331,600 MHz = Lowest transmittable 0 power
360 MHz = 0,8 Watt Lowest TX 360 MHz = 0,05 Watt
370 MHz = 0,8 Watt 370 MHz = 0,02 Watt
380 MHz = 1,6 Watt 380 MHz = 0,01 Watt
390 MHz = 3,0 Watt 390 MHz = 0,01 Watt
70 Cm
400 MHz = 2,0 Watt 400 MHz = 1,6 Watt
410 MHz = 2,7 Watt 410 MHz = 3,8 Watt
420 MHz = 4,8 Watt 420 MHz = 4,0 Watt
430 MHz = 4,2 Watt 430 MHz = 4,7 Watt
440 MHz = 5,0 Watt 440 MHz = 3,5 Watt
450 MHz = 4,0 Watt 450 MHz = 3,0 Watt
460 MHz = 3,4 Watt 460 MHz = 3,2 Watt
470 MHz = 2,5 Watt 470 MHz = 1,5 Watt
480 MHz = 1,2 Watt 480 MHz = 1,0 Watt
490 MHz = 0,8 Watt 490 MHz = 0,4 Watt
497,850 = 0,4 Watt Highest TX 492 MHz = 0,2 Watt
23 Cm
1240 MHz = 0,8 Watt
1250 MHz = 0,6 Watt
1260 MHz = 0,5 Watt
1270 MHz = 0,6 Watt
1280 MHz = 0,8 Watt
1290 MHz = 0,9 Watt
1300 MHz = 0,8 Watt
RX area
50 MHz - 230 MHz (For Both)
300 MHz - 1000 MHz (For Both)
1240 MHz - 1300 MHz (Only T81E)
To make the IC-T81E transmit on 220 MHz the TX bandpass filter must be modified.
By making changes in the TX bandpassfilters and PLL circuitry it can be possible to expand the TX further according to this tabel.
T8E T81E
50 MHz - 76 MHz 50 MHz - 87,980 MHz
136 MHz - 230 MHz 136 MHz - 230 MHz
300 MHz - 600 MHz 300 MHz - 600 MHz
1240 MHz - 1300 MHz
To make the transmitters work on other bands than this, a logical override circuit must be made and mounted into the transceiver. This circuit intercepts the signals between the microprosessor and the radio circuitry and enables the TX when the PTT switch is pressed even if TX clearence from the microprosessor is missing. With this extra circuitry monted into the transceiver it should be possible to enable TX on 76 MHz - 136 MHz and for the T81E on frequencies between 600 MHz and 1000 MHz.
If you wish to use the transceiver on the air band, the logical intercept circuit must be mounted. Then you must modify the TX bandpassfilter and maybe the PLL circuit. Then you have to mount a micro relay or an electronic switch. With this relay you will be able to switch the audio signals from the mic circuit from going to the FM modulating varactor diode to the base of a prefinal transistor in the TX circuit.
This will make the transmitter transmit AM instead of FM. The AM circuit can be mounted on the same board as the logical intercept circuit.
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