EME178 PA Module Kits

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EME178 KIT Description:

The EME178 PC board suits all the current low power VHF and UHF RA series Mitsubishi RF power modules. Mini-kits specifically has two Kits to suit the 2m 144-148MHz, and 430-450MHz bands. The Amplifiers are suitable for all modes including AM, FM and linear SSB. For SSB use the power output to use in linear operation is around half the power rating of the module.

Kit Constructors Alert:

RA07H4047M KIT

1/ Refer to the Kit changes and Repair section for possible issues with setting the bias when using supply voltages from +12 to +13.8vdc.

RA08H1317M KIT

1/ Refer to the Kit changes and Repair section for possible issues with setting the bias when using supply voltages from +12 to +13.8vdc.

Mitsubishi Service Bulletins:

For the latest service bulletins and data sheets, please see the Mitsubishi Semiconductors website.

RA07H4047M Kit Construction Notes:

The pictures below show the basic constructed module board without the module fitted. The Kit construction notes and overlay diagrams should be carefully followed when constructing. For larger pictures to check orientation of some components, click the images below. Construction is quite straight forward and the only tricky part is the winding of the small coils. There should be no alignment required to the low pass filter coils if it is constructed careful. BUY THIS PRODUCT

RA08H1317 Top View
The picture shows the basic constructed RA08H4047M Kit without the module fitted. TO BE UPDATED
Low Pass Filter
The picture shows how the coils are wound and orientated to fit the board

RA08H1317M Kit Construction Notes:

The pictures below show the basic constructed module board without the module fitted. The Kit construction notes and overlay diagrams should be carefully followed when constructing. For larger pictures to check orientation of some components click the images below. Construction is quite straight forward and the only tricky part is the winding of the small coils. There should be no alignment required to the low pass filter coils if it is constructed careful. BUY THIS PRODUCT

RA08H1317 Top View
The picture shows the basic constructed RA08H1317M Kit without the module fitted.
Low Pass Filter
The picture shows how the coils are wound and orientated to fit the board

Mounting into a Hammond Die cast Enclosure:

To be done still

Kit Changes and Repairs:

ALL PA KITS

1/ There is a possibility that the bias when adjusted to the maximum voltage of +3.3v is not enough to make the module drain current high enough to allow the module to produce the full RF output power. This could be due to using a +12vdc supply which may require a higher bias voltage around +3.5vdc compared to using a +13.8vdc supply that requires a lower gate voltage nominally around +3vdc. In this case a series 1N4148 diode can be fitted in series with the 3v3 regulators ground pin to the PCB ground connection which should lift the voltage from the regulator to around 4v maximum allowing the bias to be set. However be careful as the maximum rating for the bias voltage is +4vdc which could damage the module if it is run from a +13.8vdc supply. Carefully desolder the bias pin on the Mitsubishi module from the board. Cut the regulators pin and desolder the remaining lead connection from the PC board ground. Fit the diode as shown in the picture below and be careful that you get the diode the correct way around with the Cathode black band going the PCB ground and check that the maximum voltage is no more than 3.9vdc before the Mitsubishi module is fitted. Refer to the Kit Change and Repair section below for a picture of the modification.

Diode Modification
The picture shows the 1N4148 diode modification to the LD11173v3 regulator to increase the maximum bias to around 3.9vdc.

RA07H4047M KIT

1/ There are no current changes to this Kit

RA08H1317M KIT

1/ There are no current changes to this Kit