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.
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:
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.
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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
Impossible. I always make at least one mistake. Re-reading, I find:
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
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