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

["Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>]

Almost any Start/stop and tune can be encoded and decoded,
but adds complexity to a build it yourself system.

73

Roger  (K8RI)

On 1/7/2016 Thursday 10:15 AM, Joe Subich, W4TV wrote:
> Don,
>
> On 1/7/2016 9:53 AM, n8de@thepoint.net wrote:
> > Why the 4-wire control cable?
>
> The question specifically stated the need to control an Icom AH-4
> tuner.  The Icom tuners require +13.8V and ground (which can be
> supplied via a bias T) but they also require control lines "start"
> and "key" which can not be multiplexed onto the coaxial cable.
>
> One could possible use "siamese" coax plus single pair with a
> bias-T but the Icom tuners still require some individual control
> lines.  *Unfortunately*, most siamese cable is 75 Ohm, not 50 Ohm.
>
> 73,
>
>    ... Joe, W4TV
>
>
> On 1/7/2016 9:53 AM, n8de@thepoint.net wrote:
> > 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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--

73

Roger (K8RI)


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