Coax Switches

[Elecraft mailing list]

I  use the Alpha Delta Series.  They have SO-239 and "N" connector models, two position or four position.  For the price difference, I always get four position.

They are not only well built switches, but they do have surge protection (gas) with a replaceable pill.  Their best feature is the very high isolation they offer:

30 MHz  >60 dB
150 MHz >50 dB
450 MHz 50 dB

And dB Loss:

30 MHz  0.1 dB
150 MHz 0.15 dB
450 MHz 0.5 dB

So, I wish these could be remotable.  However, they are the best switches I've found for a reasonable price, and I have many of them in my station.

Oh yes, on the outside of my house, I have polyphasers.

'73 de JIM N2ZZ



I do use a number of Daiwa 2-position coax switches for various
purposes. Any comments on coax switches?

Bill W2BLC K-Line




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[Bob McGraw - K4TAX]

Smart man and decisions and the way to do things correctly.  Glad to see
this.

73

Bob, K4TAX


On 2/17/2019 9:38 AM, James F. Boehner MD via Elecraft wrote:

> I  use the Alpha Delta Series.  They have SO-239 and "N" connector models, two position or four position.  For the price difference, I always get four position.
>
> They are not only well built switches, but they do have surge protection (gas) with a replaceable pill.  Their best feature is the very high isolation they offer:
>
> 30 MHz  >60 dB
> 150 MHz >50 dB
> 450 MHz 50 dB
>
> And dB Loss:
>
> 30 MHz  0.1 dB
> 150 MHz 0.15 dB
> 450 MHz 0.5 dB
>
> So, I wish these could be remotable.  However, they are the best switches I've found for a reasonable price, and I have many of them in my station.
>
> Oh yes, on the outside of my house, I have polyphasers.
>
> '73 de JIM N2ZZ
>
>
>
> I do use a number of Daiwa 2-position coax switches for various
> purposes. Any comments on coax switches?
>
> Bill W2BLC K-Line
>
>

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[WW3S]

+1 , just 2 position here....

Sent from my iPad

> On Feb 17, 2019, at 10:38 AM, James F. Boehner MD via Elecraft <[hidden email]> wrote:
>
> I  use the Alpha Delta Series.  They have SO-239 and "N" connector models, two position or four position.  For the price difference, I always get four position.
>
> They are not only well built switches, but they do have surge protection (gas) with a replaceable pill.  Their best feature is the very high isolation they offer:
>
> 30 MHz  >60 dB
> 150 MHz >50 dB
> 450 MHz 50 dB
>
> And dB Loss:
>
> 30 MHz  0.1 dB
> 150 MHz 0.15 dB
> 450 MHz 0.5 dB
>
> So, I wish these could be remotable.  However, they are the best switches I've found for a reasonable price, and I have many of them in my station.
>
> Oh yes, on the outside of my house, I have polyphasers.
>
> '73 de JIM N2ZZ
>
>
>
> I do use a number of Daiwa 2-position coax switches for various
> purposes. Any comments on coax switches?
>
> Bill W2BLC K-Line
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> 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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[Mike Markowski-2]

At work (RF lab), dBm power units let a feeble-minded engineer :-) use
plus/minus rather than times/divide with Watts for calculations.

For isolation and other calculations in the ham shack where Watts are
used, a few python one-liners useful.  (Python is free and runs on
Windows, Mac, linux.)  When in python, copy the following:

from math import *
w2dbm = lambda x: 10 * log10(x/10) + 30
dbm2w = lambda x: 10 ** ((x-30)/10)
iso = lambda pwr_W, iso_dB: dbm2w(w2dbm(pwr_W) - iso_dB)

and now something like

 >>> iso(1500, 60)
0.001500

tells you that 1500 W with 60 dB isolation leaks 1.5 mW to the other port.

73,
Mike ab3ap

On 2/17/19 10:38 AM, James F. Boehner MD via Elecraft wrote:

> I  use the Alpha Delta Series.  They have SO-239 and "N" connector
> models, two position or four position.  For the price difference, I
> always get four position.
>
> They are not only well built switches, but they do have surge
> protection (gas) with a replaceable pill.  Their best feature is the
> very high isolation they offer:
>
> 30 MHz  >60 dB 150 MHz >50 dB 450 MHz 50 dB
>
> And dB Loss:
>
> 30 MHz  0.1 dB 150 MHz 0.15 dB 450 MHz 0.5 dB
>
> So, I wish these could be remotable.  However, they are the best
> switches I've found for a reasonable price, and I have many of them
> in my station.
>
> Oh yes, on the outside of my house, I have polyphasers.
>
> '73 de JIM N2ZZ
>
>
>
> I do use a number of Daiwa 2-position coax switches for various
> purposes. Any comments on coax switches?
>
> Bill W2BLC K-Line
>
>
>
>
> ______________________________________________________________
> 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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[ANDY DURBIN]

"
from math import *
w2dbm = lambda x: 10 * log10(x/10) + 30
dbm2w = lambda x: 10 ** ((x-30)/10)
iso = lambda pwr_W, iso_dB: dbm2w(w2dbm(pwr_W) - iso_dB)

and now something like

 >>> iso(1500, 60)
0.001500

tells you that 1500 W with 60 dB isolation leaks 1.5 mW to the other port."

Does dividing 1,500 by 10 to the power of 6 really need a computer and a Python script?  Why not just move the decimal point 6 times?

73,
Andy, k3wyc
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[Bill Clarke]

Thanks for the math stuff! 'Specially that last line. Good to know.

Also, some emails asked where I get/what is a slip on PL259. Go here:

https://www.rfparts.com/rfp530.html

May be others, but that is where I got my newest ones.

Bill W2BLC K-Line


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[Mike Markowski-2]

On 2/17/19 4:32 PM, Andy Durbin wrote:

> "
> from math import *
> w2dbm = lambda x: 10 * log10(x/10) + 30
> dbm2w = lambda x: 10 ** ((x-30)/10)
> iso = lambda pwr_W, iso_dB: dbm2w(w2dbm(pwr_W) - iso_dB)
>
> and now something like
>
>   >>> iso(1500, 60)
> 0.001500
>
> tells you that 1500 W with 60 dB isolation leaks 1.5 mW to the other port."
>
> Does dividing 1,500 by 10 to the power of 6 really need a computer and a Python script?  Why not just move the decimal point 6 times?
>
> 73,
> Andy, k3wyc

Bad example. :-)  Use messier numbers.  General shack use for quick
conversions is the point.

73,
Mike ab3ap
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[W2xj]

I generally do DBs in my head. Just remember with power 3 db=2X,  6db-4X, 7DB=5X and 10 db=10X. It scales from there. Every 10 db is a factor of 10. 60 db is a factor of one million. Just divide 1500 by a million.  

For voltage the scale doubles so 20 db is 10X, 6 db is 2X, etc.

Sent from my iPad

> On Feb 17, 2019, at 4:22 PM, Mike Markowski <[hidden email]> wrote:
>
> At work (RF lab), dBm power units let a feeble-minded engineer :-) use plus/minus rather than times/divide with Watts for calculations.
>
> For isolation and other calculations in the ham shack where Watts are used, a few python one-liners useful.  (Python is free and runs on Windows, Mac, linux.)  When in python, copy the following:
>
> from math import *
> w2dbm = lambda x: 10 * log10(x/10) + 30
> dbm2w = lambda x: 10 ** ((x-30)/10)
> iso = lambda pwr_W, iso_dB: dbm2w(w2dbm(pwr_W) - iso_dB)
>
> and now something like
>
> >>> iso(1500, 60)
> 0.001500
>
> tells you that 1500 W with 60 dB isolation leaks 1.5 mW to the other port.
>
> 73,
> Mike ab3ap
>
>> On 2/17/19 10:38 AM, James F. Boehner MD via Elecraft wrote:
>> I  use the Alpha Delta Series.  They have SO-239 and "N" connector
>> models, two position or four position.  For the price difference, I
>> always get four position.
>> They are not only well built switches, but they do have surge
>> protection (gas) with a replaceable pill.  Their best feature is the
>> very high isolation they offer:
>> 30 MHz  >60 dB 150 MHz >50 dB 450 MHz 50 dB
>> And dB Loss:
>> 30 MHz  0.1 dB 150 MHz 0.15 dB 450 MHz 0.5 dB
>> So, I wish these could be remotable.  However, they are the best
>> switches I've found for a reasonable price, and I have many of them
>> in my station.
>> Oh yes, on the outside of my house, I have polyphasers.
>> '73 de JIM N2ZZ
>> I do use a number of Daiwa 2-position coax switches for various purposes. Any comments on coax switches?
>> Bill W2BLC K-Line
>> ______________________________________________________________ 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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>
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> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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