What about a 2 element yagi (could be hidden in the ceiling)
Roy

On 4/08/2016 4:58 PM, "Neil" <picdude3@narwani.org> wrote:

> Hi all,
>
> I built a quick device for a friend that lets a receptionist send
> messages from a PC to a desktop display device, and vice-versa with a
> handful of canned responses.  The PC side uses VB to serial (via USB),
> to a USB-to-serial interface, then a 433 Mhz serial module, through an
> IPEX-to-RP-SMA interface, to a short whip antenna.  The desktop display
> device also has the same 433 Mhz serial module (controlled by an
> Arduino), to the same IPEX-to-RP-SMA interface cable, then to an
> identical whip antenna.
>
> I'm not getting the range necessary... I'm getting 35-ish feet indoors
> (through one wall), and need about 100 feet indoors (in an office
> through a glass wall).  I've tried a 433 Mhz PCB antenna, but that got
> me less distance than the whip antennas.  And the whip antennas are
> listed as being for 433 Mhz.
>
> Any clues on how to get better distance?  I'm looking for 433Mhz
> amplifiers, but they're a bit pricey.  I'm short on time, so hoping to
> find a ready-made solution (if an amp is necessary), rather than having
> to build one.
>
> Cheers,
> -Neil.
>
>
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