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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+Antenna\s+change\s+over\s+relay\s+question\s*$/: 2 ]

Total 2 documents matching your query.

1. LF: Antenna change over relay question (score: 1)
Author: Chris Wilson <>
Date: Mon, 24 Jul 2017 14:33:46 +0100
Hello LF'ers, I have a QRP Labs U3S that is the exciter for a 1kW LF amp. I want the common antenna to switch to feeding my Kenwood TS-590 for RX. The U3S has a pin with selectable delay that goes to
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-07/msg00134.html (10,721 bytes)

2. Re: LF: Antenna change over relay question (score: 1)
Author: DK7FC <>
Date: Mon, 24 Jul 2017 15:46:06 +0200
Hi Chris, Use an optocoupler such as CNY 17-4 or 4N28 with 470R in series to the input. The output can be used to switch a IRF540 for example. 73, Stefan Am 24.07.2017 15:33, schrieb Chris Wilson: He
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-07/msg00136.html (10,900 bytes)


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