{"id":1080,"date":"2022-02-21T01:10:31","date_gmt":"2022-02-21T00:10:31","guid":{"rendered":"https:\/\/oz3z.dk\/?page_id=1080"},"modified":"2025-04-14T07:13:25","modified_gmt":"2025-04-14T06:13:25","slug":"432mhz-1000w-pa","status":"publish","type":"page","link":"https:\/\/oz3z.dk\/?page_id=1080","title":{"rendered":"432MHz 1000W PA"},"content":{"rendered":"

I have used my old 400W PA for 432MHz for several years, but since it never was built into an enclosure, it was obvious to make a brand new 1000W PA instead. I had a surplus Plish 2000W water-cooled PA ready to rebuild for 432MHz. It’s quite large, and imposible to find enough room for on the shelfs in my little shack. So I decide to make a more compact version. -and 2000W is also more than needed.
I found what I was looking for, – a 1000W 432MHz PA based on LDMOS for 50V. I also found a Huawei R4850G 3000W 50V SMPSU.
During the fall 2021 I found an nice heatsink I believe will fit perfect for 600W dispatched from the amplifier, but fans will be needed for sure.
After some blue smoke from the first 2 x 600W pallets, I decided to buy a ITALAB MD1K-432<\/a> pallet. Unfortunately an expensive solution, but this pallet is used in TAJFUN 1000 432<\/a> MHz for some years, I therefore assume quality is proven to be okay. LDMOS used in this pallet are MRFE6VP61K25HR5<\/a>.\u00a0
I have experienced during tests that RG400 is to losy for 432MHz 1kW, and get’s extremely hot, so I’ll replace it with some 1\/4″ semirigd that was left from my 1296MHz PA project. Enclosure has also been found. For this project I decide not to use a surplus solution, as the surplus enclosures I had, was either too big, or too small. I found a 19 “rack-mounted enclosure at RS that just fits perfect\u00a0 into this project. Link to the enclosure by clicking on this line\u00a0<\/a><\/p>\n

At the shelf I had other good parts for this project:<\/p>\n