RF Cable From KX3 to KXPA 100

Hi Everyone,

Quick question:  Should the coax from the KX3 to the KXPA100 be RG-8x or RG-8 (or the equivalents). The length will be two (2) feet.

Tnx & 73,

Jeff/wb0m
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[Joe DeVincentis]

IMHO 8x is a good choice.  8 is overkill.

73
Joe, KO8V

-----Original Message-----
From: [hidden email] <[hidden email]> On Behalf Of [hidden email]
Sent: Sunday, May 9, 2021 18:49
To: [hidden email]
Subject: [Elecraft] RF Cable From KX3 to KXPA 100

Hi Everyone,

Quick question:  Should the coax from the KX3 to the KXPA100 be RG-8x or RG-8 (or the equivalents). The length will be two (2) feet.

Tnx & 73,

Jeff/wb0m
 
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[Don Wilhelm-5]

Jeff,

Either would be more that adequate.  You could also use RG58 if that is
better for you.
It does not have to have the high voltage ratings of RG8, and RG58 is
more flexible than RG8X.
No need for overkill.

73,
Don W3FPR

On 5/9/2021 6:49 PM, [hidden email] wrote:

> Hi Everyone,
>
> Quick question:  Should the coax from the KX3 to the KXPA100 be RG-8x or RG-8 (or the equivalents). The length will be two (2) feet.
>
> Tnx & 73,
>
> Jeff/wb0m
> ______________________________________________________________
> 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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[Mark Goldberg]

For a 2 foot cable, I don't think the loss will be significant whatever
cable is used. Cable loss for RG8 is about 1.6 dB / 100 ft at 50 MHz. Cable
loss for RG8x is about 2.5 dB / 100 ft at 50 MHz. Cable loss for RG58 is
about 3.3 dB / 100 ft at 50 MHz. So 2 ft of each would be 0.03 dB or 0.05
dB or 0.06 dB, all insignificant. Connector loss is on the order of .1 dB
per connector. So, more important will be the quality of the connectors and
the quality of the cable shielding. I use way better cables than required,
so I would not be a good reference point, but I use a lab quality RG58C/U
cable containing a stranded center conductor (for flexibility) with two BNC
connectors and an adapter between my KX3 and amp. Don't buy cheap no name
cables from Amazon or eBay.

73,

Mark
W7MLG

On Sun, May 9, 2021 at 3:49 PM [hidden email] <[hidden email]> wrote:

> Hi Everyone,
>
> Quick question:  Should the coax from the KX3 to the KXPA100 be RG-8x or
> RG-8 (or the equivalents). The length will be two (2) feet.
>
> Tnx & 73,
>
> Jeff/wb0m
> ______________________________________________________________
> 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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