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Re: [TowerTalk] Siamese type Coaxial Cable with /4 wire needed.

To: jimlux <jimlux@earthlink.net>
Subject: Re: [TowerTalk] Siamese type Coaxial Cable with /4 wire needed.
From: n8de@thepoint.net
Date: Thu, 07 Jan 2016 09:53:00 -0500
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Why the 4-wire control cable?

You can use the coax for switching ... I invented the idea in the 70's... it's very much like what is in the ARRL Antenna Handbook (and the ARRL Handbook) ... similar switching is available from MFJ/Ameritron .. and was used by Drake and Heathkit years ago.

Just need to build a small blocking circuit at each end of the coax.

73
Don
N8DE


Quoting jimlux <jimlux@earthlink.net>:

On 1/7/16 4:23 AM, John K0CQW wrote:
Looking for 8X type coax with 20 ga / 4 wire control Siamese together.
approximately 50 feet.(OR variations)


You might find some 75 ohm coax with wires as used in security/video/
ENG systems.

Belden 9265 is RG59 + a shielded twisted pair. 9165 has 3 pairs.
http://www.belden.com/techdatas/english/9265.pdf
1dB/100ft loss at 10 MHz

There's also Belden CCTV cable RG6 + 18/2




For only 50 ft, I'd get some black heat shrink and use it to bundle
your coax and control cable. something like a half inch of heat shrink
every foot.

Or, depending on the environment, just spiral black tape the length of it.


 Any sources ?

Looking to get a OM on the the air in a assisted living.

 Working with a Icom AH-4.

Are you fixed on the AH4?  There are other remote tuners that can be
powered/controlled via the coax.




HAVE to make this a "CLEAN" installation.

 Specifically looking for the coax and control wire together.

Thanks de John KØCQW
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