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

[Roger (K8RI) on TT]

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 at 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 at 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 at 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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>>
>>
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-- 

73

Roger (K8RI)


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