This is the current schematic of the 500kHz TX down-converter I use for WSPR. It uses an IRF510 FET PA and generates about 5W from the PA stage, although the ERP is only around 1mW from the antenna. I am planning to add the RX converter stages and an RF sensing circuit so I can use other modes in full transceive on 500kHz. The input is my FT817 at 500mW on 28MHz which is mixed down to 500kHz in an SBL1 mixer.
24 Oct 2009
500kHz TX schematic (5W)
This is the current schematic of the 500kHz TX down-converter I use for WSPR. It uses an IRF510 FET PA and generates about 5W from the PA stage, although the ERP is only around 1mW from the antenna. I am planning to add the RX converter stages and an RF sensing circuit so I can use other modes in full transceive on 500kHz. The input is my FT817 at 500mW on 28MHz which is mixed down to 500kHz in an SBL1 mixer.
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What class of operation does the final amplifier running? Is it class-E ?
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