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     Peter Miles
     Northam, Western Australia
     QRZ Page: VK6YSF

 

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70cm MAST HEAD PRE-AMPLIFIER REPAIR

Mini-kits EME221-70CM 70cm Mast Head Pre-amplifier. 23 July 2024


 

Repairs completed on the mini-kits EME221-70CM mast head pre-amplifier involved the replacement of the surface mounted PGA-103 and PSA-0012 MMIC Amplifier chips. It was determined during the repair work that the PGA-103 chip was not faulty, however it was replaced as it was not worth undoing the work.  

IC1,     PGA-103 High Dynamic range MMIC Amplifier 0.05-4GHz

Low Noise Figure, 0.6 at 1 GHz; 0.9 dB at 2 GHz

Gain, 11.0 dB typ. at 2 GHz

 

IC2,     PSA-0012 High Dynamic Range MMIC Amplifier 0.05-6GHz

Low Noise Figure, 2.4 dB typ. at 1 GHz

Gain, 16 dB typ. at 1 GHz  

 

 

Figure 1. Circuit schematic EME221-70CM mast head pre-amplifier

 

 

 

Photo 1. Completed EME221-70CM mast head pre-amplifier board.

 

  

 

 

 

Video of repairs including on air test carried out with the International Space Station repeater in a contact with VK6GC.  

 

See construction of the EME221-70CM mast head pre-amplifier kit:

https://vk6ysf.com/pre_amp_70cm_kit_202011.htm

 

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Page last revised 06 September, 2024

 

 

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