The ICOM IC-T90A transmits on 6 meters, 2 meters and 440 MHz and also has wide band AM, FM and A Wide FM scanning receiver.
Here are the instructions for expanding the TX
To expand the HT for full band coverage ( 45.300 Mhz to 240Mhz and 300Mhz to 584Mhz ) Remove the Battery, underneath you will find a plastic cover. Peel it off and underneath you will see 3 SMT Diodes, carefully remove them, replace the sticky cover, istall the battery, Do a Reset on the radio and you are done.
Below are before and after pictures ( the board was removed from radio case )
After resetting the coverage and power output will more of less be as follows:
45.300 mhz 3.8 wattsto75.100 mhz 1.5 watts Power output as specified in the ham band.to89.000 mhz Output tapers down until pll unlocks.90.700 mhz Pll locks very low output.to92.500 mhz 0.8 wattsto110.000 mhz 0.8 watts117.800 mhz 1.0 wattsto179.900 mhz 2.0 watts Power output as specified in the ham band.to238.000 mhz Output tapers down until pll unlocks. Output in the 220 band is very low.300.000 mhz 0.5 wattsto540.000 mhz 0.5 watts Power output as specified in the ham band.to580.000 mhz Output tapers down until pll unlocks.Mod does not open the blocked cell area.
The above was verified on a Cushman CE50 service monitor. Even though the power output is low out of band, and near the edges of the pll lock range the frequency accuracy suffers, it is still useful for testing purposes. Transmit is FM only.
73
Jeff
Here are the instructions for expanding the TX
To expand the HT for full band coverage ( 45.300 Mhz to 240Mhz and 300Mhz to 584Mhz ) Remove the Battery, underneath you will find a plastic cover. Peel it off and underneath you will see 3 SMT Diodes, carefully remove them, replace the sticky cover, istall the battery, Do a Reset on the radio and you are done.
Below are before and after pictures ( the board was removed from radio case )
After resetting the coverage and power output will more of less be as follows:
45.300 mhz 3.8 wattsto75.100 mhz 1.5 watts Power output as specified in the ham band.to89.000 mhz Output tapers down until pll unlocks.90.700 mhz Pll locks very low output.to92.500 mhz 0.8 wattsto110.000 mhz 0.8 watts117.800 mhz 1.0 wattsto179.900 mhz 2.0 watts Power output as specified in the ham band.to238.000 mhz Output tapers down until pll unlocks. Output in the 220 band is very low.300.000 mhz 0.5 wattsto540.000 mhz 0.5 watts Power output as specified in the ham band.to580.000 mhz Output tapers down until pll unlocks.Mod does not open the blocked cell area.
The above was verified on a Cushman CE50 service monitor. Even though the power output is low out of band, and near the edges of the pll lock range the frequency accuracy suffers, it is still useful for testing purposes. Transmit is FM only.
73
Jeff