Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views.
It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if
you would like to post something on RF Cafe's
page, please do.
Below are all of the forum threads, including all
the responses to the original posts.
Post subject: Need very small UHF (800 MHz) NBFM receiver
chip ? Posted: Tue Jul 05, 2005 10:14 am
I need a very small receiver
chip for the following application:-
Frequency UHF (circa 800
Modulation: Narrow band FM (1 Kbps, 3 kHz peak deviation)
Supply voltage: Any
Supply current: As low as possible (target <
10mA @ 3 - 5 Volts)
Type: Any of Single Conversion / Double conv
/ Direct conv etc
Rx sens: Better than -115dBm (12 dB sinad or 10-4
Other rx spec: Best poss blocking, image etc
it would have on chip PLL and on chip demodulation. There do seem to
be a few chips around but those I have found require substantial power
or are designed for wider band work.
Any suggestions ?
Post subject: Posted: Tue Jul 05, 2005 10:34
Joined: Mon Jun 27, 2005 2:02 pm
try companies like XEMICS, MELEXIS they manufacture receivers/transceivers
for ISM band and similar applications.
Posted: Wed Jul 06, 2005 1:26 pm
Most chips with a PLL are going
to be for the 868 and/or 915 MHz ISM band. Is this what you are after?
I checked some of the info I keep, and couldn't find anything
that met all your requirments. Most of the available devices are transceiver
chips. Very few of the available devices can operate from less than
10 ma. Most require 15 to 28 mA for receive Additionally, very few of
the available devices can do -115 dBm sensitivity. Most state sensitivity
in the -100 to -110 range.
In addition to what Steve R suggested,
try www.bluechip.no and www.integration.com . Additionally, Freescale
at their recent technology conference presented information a MC33695
(?) -I don't think they have posted data sheets on the web yet.
Post subject: NBFM and WBFM rangesPosted:
Thu Jul 21, 2005 9:47 am
Please tell me what are the
maximum and minimum range that NBFM and WBFM support