Henry 2K-4 RF Amplifier QSK Modification
by NE7X
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To resolve this QSK problem I decided to replace the slower mechanical T/R relay in the Henry 2K-4 with high speed Gigavac model GH1-HAM (datasheet) 5KW RF 6ms 12VDC SPDT vacuum relays. Not only will this resolve the issue of having the IC-7700 transmitting into an open circuit every time I key the transmitter, it will also allow the amplifier to run full QSK break-in. I found the GH1 vacuum relays actually switched in 3ms. The 6ms is the manufacture’s worse case value.
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