New User: High SWR on XMT, RX Works Great

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Jay Miller

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Jul 29, 2026, 12:02:00 PM (10 days ago) Jul 29
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After 60 years of tube radios I was finally shamed into dipping my toe in the digital world. Bought the HL2+. Thanks to many YouTube videos it assembled without issue. I am a professional Mac user so I'm trying it on SparkSDR. Receive is really great on all bands. But when I try to transmit, the SWR goes very high (every band). All cables are new and have been checked and rechecked. Dummy load is also checked and calibrated. I checked the filter board with a magnifier and can see nothing amiss (the SMC are WAY over my head). Put a meter on the ANT jack (filter board removed from radio and no connections) and measured about 3K between the center pin and shell. I have the schematic. Any clues? Thanks and 73 de KK5IM.

Volker E.

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Jul 30, 2026, 6:39:43 AM (9 days ago) Jul 30
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Do you use the same connector for rx and tx? Selected the right one in your  software? Exansionboard with another connector?
Only idea´s...

73 Volker

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