Re: [Elecraft] Coax Switches for KPA1500
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 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:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to c-haw...@illinois.edu __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Coax Switches for KPA1500
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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Elecraft] Coax Switches for KPA1500
One option in my thinking is to use the coax switch on the input of the KPA1500. Then one can switch between the K3 and K2/100 and not need a high power switch. The KPA1500 in standby is then in bypass mode and one doesn't have concerns about switching high power. Oh what the heck do I know. I only run a KPA500 with switching between two radios to the input. Also have PTT interfaced accordingly. 73 Bob, K4TAX On 7/21/2018 4:52 PM, j...@kk9a.com wrote: I have had a Daiwa two position switch for decades. It is not part of my permanent setup however I have used it on many occasions running legal limit on HF without issue. It appears to be a well made switch. If they did not discontinue the four position one I would have purchased one for a DXpedition. Power ratings are frequency related, your switch is rated up to 600MHz and perhaps the UHF connectors are the limiting factor. At what frequency is it rated for 1KW CW? You did not specify what bands you operate, if you want the best manual coax switch look at a Bird. John KK9A Elecraft] Coax Switches for KPA1500 Dauer, Edward edauer at law.du.edu 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to rmcg...@blomand.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] Elecraft] Coax Switches for KPA1500
I have had a Daiwa two position switch for decades. It is not part of my permanent setup however I have used it on many occasions running legal limit on HF without issue. It appears to be a well made switch. If they did not discontinue the four position one I would have purchased one for a DXpedition. Power ratings are frequency related, your switch is rated up to 600MHz and perhaps the UHF connectors are the limiting factor. At what frequency is it rated for 1KW CW? You did not specify what bands you operate, if you want the best manual coax switch look at a Bird. John KK9A Elecraft] Coax Switches for KPA1500 Dauer, Edward edauer at law.du.edu 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Coax Switches for KPA1500
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" 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=Default=Ascending
Chuck Hawley
c-haw...@illinois.edu
Amateur Radio, KE9UW
aka Jack, BMW Motorcycles
From: elecraft-boun...@mailman.qth.net [elecraft-boun...@mailman.qth.net]
on behalf of Dauer, Edward [eda...@law.du.edu]
Sent: Saturday, July 21, 2018 2:38 PM
To: elecraft@mailman.qth.net
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
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Re: [Elecraft] Coax Switches for KPA1500
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=Default=Ascending Chuck Hawley c-haw...@illinois.edu Amateur Radio, KE9UW aka Jack, BMW Motorcycles From: elecraft-boun...@mailman.qth.net [elecraft-boun...@mailman.qth.net] on behalf of Dauer, Edward [eda...@law.du.edu] Sent: Saturday, July 21, 2018 2:38 PM To: elecraft@mailman.qth.net 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to c-haw...@illinois.edu __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
