Re: How to best Expand RF Range

[nobody@xxxxxxxxxxxx (Dave Houston)]

I've had people tell me they got 150' or more with an unamplified turnstile
and a bit more with unamplified eggbeaters. A preamp improves both. YMMV.

It's worth a try to use your TV setup. X-10 uses 310MHz which is UHF. You'll
still need to add the connector at the CM15A. Use whatever matches your
system - probably 75 ohm F-connector. The TV antenna probably is better with
signals originating outside your house rather than inside but it's worth
trying. If you're happy with the range it gives that's all that matters.

JW <JW> wrote:

>Dave... this is really excellent stuff! I'm a tinkerer/hack and these
>instructions are perfect for people like myself who know just enough
>to get into trouble.
>
> I have a couple of quick questions...
>1. What kind of "average" range increase will this modification
>provide?  If I have current range of 25', will this boost me to
>50'...75'...more?
>
>2. This may be a really "out there" question but:  I have a 30' tv
>antenna in the attic of the house (yes: I refuse to pay for
>television) and the house is wired with coax.  There is also an
>amplifier mounted on the antenna mast.
>
>Can I simply plug my modified CM15A into the existing antenna system
>and enjoy the desired results?
>
>Thanks again!
>Joe
>
>
>
>On Mon, 05 Dec 2005 14:51:17 GMT, nobody@xxxxxxxxxxxx (Dave Houston)
>wrote:
>
>>The CM15A's RF circuitry is isolated from the mains so it's a fairly simple
>>matter to replace the antenna if you can solder.
>>
>>I recommend either a turnstile antenna (requires a matching transformer) or
>>an eggbeater (requires a short length of 93-ohm coax). I prefer the
>>eggbeater as it's a bit more efficient and doesn't require a matching
>>transformer.
>>
>>There are instructions for adding a connector here...
>>
>>     http://www.accessx10.com/howto_fconnector_page3.html
>>
>>I suggest using a 50-ohm coax connector (a better impedance match) rather
>>than the F-connector shown. You can buy preassembled 50-ohm coax online.
>>
>>There are instructions for building a turnstile antenna for the MR26A.
>>
>>     http://www.shed.com/tutor/mr26ant.html
>>
>>You should also be able to find instructions for building an eggbeater
>>although I'm not sure there are any specific to the CM15A or MR26A.
>>
>>Put the antenna in a central location both horizontally and vertically.
>>
>>Adding a wideband preamp (Ten-Tec 1001) at the antenna will result in an
>>even bigger range increase.
>>
>>     http://radio.tentec.com/kits/Accessory
>>
>>JW <JW> wrote:
>>
>>>I have a dozen modules around the house controlling lights...all on
>>>the same phase, so I'm in no hurry to install a phase coupler.
>>>
>>>What I would like is to expand the RF range within the house, and
>>>outside, as well.
>>>
>>>I have the CM15A centrally located, and it works great as long as I'm
>>>within 20 - 25 feet, but beyond that, forget it.
>>>
>>>What is the best way to extend the range?  I have two floors +
>>>basement, and the house is about 75' from end to end.
>>>
>>>By the way, this is a great forum and the information provided here is
>>>much appreciated by newbies like myself.
>>>
>>>Regards,
>>>Joe