Re: X10 TM751 Endless Dim Problem

[nobody@xxxxxxxxxxxx (Dave Houston)]

The HCPRF receives RF from all 16 housecodes and all 16 unitcodes and
transmits PLC to all 16 housecodes and all 16 unitcodes. I haven't checked
how many of the function codes it handles but know it handles all the
standard ones (On, Off, Bright, Dim) listed in the CM17A protocol doc...

     http://software.x10.com/pub/manuals/cm17a_protocol.txt

plus All Lights On & All Lights Off. Some transceivers also handle All Units
Off and some of the functions can be triggered by more than one RF code.

The Smarthome online specs in the link I gave seem to have been written by
someone who has never used one. Look at the User manual (from Leviton) which
says, "Cat. No. HCPRF functions as a remote control receiver which accepts
ON/OFF, DIM, BRIGHT, and ALL LIGHTS ON/OFF commands of up to 256 DHC codes
from DHC remote controls."

     http://www.smarthome.com/manuals/4017_new2003.pdf

That actually makes for 576 codes, 256x2 (On, Off) + 16x4 (Dim, Bright, All
Lights On, All Lights Off).

NOTE: There are some limitations on what can be connected to the
solid-state-relay.

"Dennis" <djr-google.djrlar@xxxxxxxx> wrote:

>
>Dave,
>
>You mentioned the Leviton HCPRF All Housecode Transceiver.  I am
>looking for a transceiver that can receive and transmit all the 256
>codes, regardless of which house/unit code it's internal relay is set
>to. Even this one seems to only be able to respond to the house code it
>is set to.  Isn't there one that can respond to all of them?
>
>
>Dennis
>
>
>
>Dave Houston wrote:
>> It may not be entirely coincidental (I suspected the 20 minute abeyance
>> after (de)tuning might be heat related.) but I suspect the heat is somewhat
>> normal (or an effect of the endless transmissions). The TM751 draws 1.2W
>> when idle so should be slightly warm. If you have a ~3W nightlight, the
>> nightlight should be warmer than the TM751.
>>
>> It's been a few years since I investigated this but I found I could induce
>> it in 100% of the TM751 modules I tested (about a dozen) by aligning the
>> antenna with an extension cord. Inductive feedback of the 120kHz on the line
>> appears to trigger the phenomenon.
>>
>> The RR501, while not immune, is far less susceptible.
>>
>> However, I recommend going to the Leviton HCPRF All Housecode Transceiver.
>> It costs more but handles all housecodes, has a silent relay, and appears to
>> be immune to the endless dim syndrome.
>>
>>      http://www.smarthome.com/4017.html
>>
>> "Gavin" <gavin.alloyd@xxxxxxxxx> wrote:
>>
>> >Well, thanks Dave for the response.  Now this is interesting... I
>> >noticed that the TM751 was slightly warm when I would go over to unplug
>> >it to reset my lamps.  I didn't think much of it, but the next time I
>> >plugged it in, I put it right next to a fan running in my apartment,
>> >with air blowing right across the model.  It's been plugged in for at
>> >least a couple of hours (a record), and I haven't had an endless dim
>> >since (I've been testing it every 5 minutes or so)...
>> >
>> >Is there any possibility that an overheating module would cause an
>> >endless dim, or is this more likely a coincidence? (even if it's not, I
>> >don't really want to run a fan 24/7 just to keep the dimmer working).
>> >
>> >And if it does turn out to be a coincidence, is there a newer
>> >transceiver module that doesn't suffer from this annoying problem?
>> >
>> >Sorry for so many questions and thanks again,
>> >Gavin
>> >
>> >
>> >Dave Houston wrote:
>> >> It sounds like you've already tried the things that worked for some people.
>> >> Only a few people reported that detuning worked. If you've tried diffenent
>> >> outlets and tried reorienting the antenna (horizontal works for some,
>> >> vertical for others), I don't have any other suggestions.
>> >>
>> >> "Gavin" <gavin.alloyd@xxxxxxxxx> wrote:
>> >>
>> >> >I know this is an old subject... but I could use some help. :-]
>> >> >
>> >> >Just got ahold of a TM751, 2 lamp modules and an RF pad.  Hooked up two
>> >> >lamps, everything worked great the first day.
>> >> >
>> >> >The next day I started to get the endless dim.  Lamps turn on OK, but
>> >> >when I try to dim, they keep dimming and dimming until the lamp is off.
>> >> > To get it back on I usually have to unplug/replug the tranciever
>> >> >module.
>> >> >
>> >> >I read about (de)tuning the slug inside the TM751, opened 'er up and
>> >> >turned it 1/16 of a turn clockwise.  Put it back together, and
>> >> >everything seemed to work fine, but the endless dim starts up again
>> >> >after about 20 minutes.  To fix it I then I have to give the slug
>> >> >another turn, and still this only lasts for about 20 minutes.  I have
>> >> >tried the TM751 on every outlet in my apartment (about 9 different
>> >> >outlets).
>> >> >
>> >> >Any ideas?  Thanks all.
>> >>
>> >>
>> >> http://www.davehouston.net
>> >> http://tech.groups.yahoo.com/group/roZetta/
>> >> roZetta-subscribe@xxxxxxxxxxxxxxx
>>
>>
>> http://www.davehouston.net
>> http://tech.groups.yahoo.com/group/roZetta/
>> roZetta-subscribe@xxxxxxxxxxxxxxx


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