- Driveway Alam Weak - 4 Updates
- OT: 7-sided kilns ? - 1 Update
- radio time code clock error - 1 Update
| RogerDoger <RD@spamnothing.com>: Jul 04 11:01AM -0700 Harbor Freight Wireless Security Alarm System Item 93068 Been working for years indoors only. Recently the range has diminished. new batteries installed but still does not regain original range. It works but distance between unit is less. Was 40 feet now only works at 30 feet. Using both inside between rooms. What can cause this lose in range? Item 93068 9V at transmitter, 3 C at receiver. |
| Jeff Liebermann <jeffl@cruzio.com>: Jul 04 01:54PM -0700 On Sat, 04 Jul 2015 11:01:29 -0700, RogerDoger <RD@spamnothing.com> wrote: >Using both inside between rooms. >What can cause this lose in range? >Item 93068 9V at transmitter, 3 C at receiver. <http://www.harborfreight.com/wireless-driveway-alert-system-93068.html> The advertised range is 400ft. At 433 MHz, that's rather optimistic. 50-100 ft would be more likely. My guess, based upon the rather limited information that you've provided, is that you have some obstruction between the transmitter and receiver, which may have changed. Interior walls may have aluminum foil backed insulation, which blocks RF. Same with metallized wallpaper. Concrete walls will also block RF. If it's been working for "years", it may have accumulated some corrosion inside, even if it was only used inside. Open and clean with household cleaner (409) and a clean paintbrush. Are you using real C batteries or plastic adapters with a NiCd insert? Some devices (as I've found out the hard way) expect the 1.5V from an alakline cell instead of the 1.35 from a NiCd. Try using what the instructions recommend. Same with the 9v battery. Don't use a rechargeable NiCd 9v cell, which can be as low as 7.2v: <http://michaelbluejay.com/batteries/9v.html> Remove both units. Put the receiver in a tree and start walking with the transmitter. Measure the line of sight range. If it remains at 20ft one or both units are sick, sick, sick. It it magically increases to 100ft, relocate them so that there's no RF eating obstruction in between. Hint: Read the Harbor Fright reviews sorted by lowest priority first. There are some rather irate complaints about the lack of range. You might have received a lemon years ago, which finally died. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| "hrhofmann@sbcglobal.net" <hrhofmann@sbcglobal.net>: Jul 04 09:29PM -0700 On Saturday, July 4, 2015 at 1:01:35 PM UTC-5, RogerDoger wrote: > Using both inside between rooms. > What can cause this lose in range? > Item 93068 9V at transmitter, 3 C at receiver. Jeff's response is perfect! |
| Jeff Liebermann <jeffl@cruzio.com>: Jul 04 10:41PM -0700 On Sat, 4 Jul 2015 21:29:25 -0700 (PDT), "hrhofmann@sbcglobal.net" >Jeff's response is perfect! Impossible. I always make at least one mistake. Re-reading, I find: > Hint: Read the Harbor Fright reviews sorted by lowest priority first. That should be "lowest rating" instead. I was yacking on the phone while typing and typed what I was talking about instead of what was on the screen. Multi-tasking failure at its best. Whew... I'm still normal. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| N_Cook <diverse@tcp.co.uk>: Jul 04 09:43PM +0100 I was talking to a kiln-repairer this week. He'd recently refurbished a couple of these http://www.hobbyceramicraft.co.uk/kilns-paragon-fusion-7-glass-fusing-kiln He did not know and I could not see why the manufacturing awkwardness of 7 sides? Just some sort of gimmic or some sensible firing reason to have non-symmetry of firing or something? |
| Phil Hobbs <hobbs@electrooptical.net>: Jul 04 01:10PM -0400 > Enough reasons for me not to use the freakin' things... > I've got the best time sync source of all, courtesy > the NIST and WWVB! ;) Second best. They adjust those ones to match that yellow thing up in the sky. ;) Cheers Phil Hobbs (We just had a leap second.) -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net |
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