Coax Switches for KPA1500
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What sort of mechanical coax switches are available for 1500 watts continuous power?
The one item I haven’t yet upgraded since putting the KPA1500 amp in place was a two-position coax switch. I have the K3/KPA1500 on one side and a standby rig – a K2/100 – on the other, switching either one to the antenna feed. The Daiwa CS-201A that I have in place now is rated to 2.5 KW SSB but only 1.0 KW CW. The Daiwa 201GII has a 1.5 KW CW power rating, but it comes only with N-type connectors. I could use that with three N-to-UHF adapters, I suppose, or redo three coax terminations; but thought I’d ask first if anyone knows of a manual switch with high isolation, unused side grounded, 1.5 KW continuous power capability, and UHF-F connectors. My Internet search came up empty. Thanks in advance, Ted, KN1CBR ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Alpha Delta. It comes in N and also alternatively, SO239 connectors.
https://www.dxengineering.com/parts/alf-delta-4b actually... https://www.dxengineering.com/search/product-line/alpha-delta-coax-switches?autoview=SKU&sortby=Default&sortorder=Ascending Chuck Hawley [hidden email] Amateur Radio, KE9UW aka Jack, BMW Motorcycles ________________________________________ From: [hidden email] [[hidden email]] on behalf of Dauer, Edward [[hidden email]] Sent: Saturday, July 21, 2018 2:38 PM To: [hidden email] Subject: [Elecraft] Coax Switches for KPA1500 What sort of mechanical coax switches are available for 1500 watts continuous power? The one item I haven’t yet upgraded since putting the KPA1500 amp in place was a two-position coax switch. I have the K3/KPA1500 on one side and a standby rig – a K2/100 – on the other, switching either one to the antenna feed. The Daiwa CS-201A that I have in place now is rated to 2.5 KW SSB but only 1.0 KW CW. The Daiwa 201GII has a 1.5 KW CW power rating, but it comes only with N-type connectors. I could use that with three N-to-UHF adapters, I suppose, or redo three coax terminations; but thought I’d ask first if anyone knows of a manual switch with high isolation, unused side grounded, 1.5 KW continuous power capability, and UHF-F connectors. My Internet search came up empty. Thanks in advance, Ted, KN1CBR ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email]
Chuck, KE9UW
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Re: Coax Switches for KPA1500
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The Alpha Delta 2B fills the bill. Don't know how I missed it in the Google search.
Pricey at $75 but they have another advantage -- both sides grounded when the switch is in the "COM" position. That isn't the case for the Daiwas. If I have done the math right, 50 db isolation yields 15 milliwatts down from 1500 watts - should be OK for a K3/KPA1500 on one side and a K2 on the other. Thanks! Ted, KN1CBR On 7/21/18, 1:49 PM, "hawley, charles j jr" <[hidden email]> wrote: Alpha Delta. It comes in N and also alternatively, SO239 connectors. https://www.dxengineering.com/parts/alf-delta-4b actually... https://www.dxengineering.com/search/product-line/alpha-delta-coax-switches?autoview=SKU&sortby=Default&sortorder=Ascending Chuck Hawley [hidden email] Amateur Radio, KE9UW aka Jack, BMW Motorcycles ________________________________________ From: [hidden email] [[hidden email]] on behalf of Dauer, Edward [[hidden email]] Sent: Saturday, July 21, 2018 2:38 PM To: [hidden email] Subject: [Elecraft] Coax Switches for KPA1500 What sort of mechanical coax switches are available for 1500 watts continuous power? The one item I haven’t yet upgraded since putting the KPA1500 amp in place was a two-position coax switch. I have the K3/KPA1500 on one side and a standby rig – a K2/100 – on the other, switching either one to the antenna feed. The Daiwa CS-201A that I have in place now is rated to 2.5 KW SSB but only 1.0 KW CW. The Daiwa 201GII has a 1.5 KW CW power rating, but it comes only with N-type connectors. I could use that with three N-to-UHF adapters, I suppose, or redo three coax terminations; but thought I’d ask first if anyone knows of a manual switch with high isolation, unused side grounded, 1.5 KW continuous power capability, and UHF-F connectors. My Internet search came up empty. Thanks in advance, Ted, KN1CBR ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Edward A. Dauer
Bird coaxwitch bought at discount price on ebay are the best.
This is the switch, 4 in - 1 out. The best insultations (around 75dB up to 4 ghz), 850w continuos at 100mhz 75w at 4 ghz - lot higher power on hf. https://www.ebay.com/itm/Bird-Coax-Switch-Coaxwitch-7431-Antenna-Selector-Switch-4-positions-NOS-NEW/152986035418?_t I use them and like them very much. Ian IK4EWX -- Sent from: http://elecraft.365791.n2.nabble.com/ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Those are special. A little hard to mount on a desk. There were some interesting variations of them, like a crossover one (aa and bb to ab and ba), etc.
Chuck Jack KE9UW Sent from my iPhone, cjack > On Jul 22, 2018, at 9:18 AM, IK4EWX <[hidden email]> wrote: > > Bird coaxwitch bought at discount price on ebay are the best. > This is the switch, 4 in - 1 out. > The best insultations (around 75dB up to 4 ghz), 850w continuos at 100mhz > 75w at 4 ghz - lot higher power on hf. > > https://www.ebay.com/itm/Bird-Coax-Switch-Coaxwitch-7431-Antenna-Selector-Switch-4-positions-NOS-NEW/152986035418?_t > > I use them and like them very much. > > Ian IK4EWX > > > > -- > Sent from: http://elecraft.365791.n2.nabble.com/ > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email]
Chuck, KE9UW
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