Just catching up on the list. This is FM modulation. Thanks for the point= er on this....kinda interesting... --- On Tue, 8/18/09, Dwayne Reid wrote: > From: Dwayne Reid > Subject: Re: [EE] RF Field Strength Meter suggestions > To: "Microcontroller discussion list - Public." > Date: Tuesday, August 18, 2009, 5:55 PM > At 03:38 PM 8/18/2009, alan smith > wrote: > >This is for all the RF folks on the list. > > > >I'm looking for a simple RF Field strength meter, such > as the Bird = > >4041.=A0 The frequeny range is below 900MHz, > primarily 75MHz, 150MHz and 220MHz. > > > >The users are not highly technical but test and QA > where they need = > >something simple...like the analog meter the Bird has, > to just = > >validate the transmitters are working at a given > distance. > = > What modulation (if any)? > = > If this is simple CW or AM or FM modulation (NOT digital On > Off = > Keying), I can recommend a really inexpensive frequency > counter that = > I'm purchasing from Asia. > = > Search for "GY560" on eBay.=A0 Prices range from US $10 > and up. > = > They have a 2-line character display - the frequency is > displayed on = > the upper line and bar-graph type indication of signal > level is shown = > on the lower line. > = > They will also display frequency for OOK devices such as > car remote = > key-fobs or garage-door openers but there is no indication > of field = > strength in that mode. > = > These are surprisingly accurate frequency counters!=A0 > The input stage = > is really noisy - you get completely random readings that > change as = > you vary the extensible antenna length but there is no > indication of = > signal level when there is no signal. > = > Hope this helps! > = > dwayne > = > -- = > Dwayne Reid=A0=A0=A0 > Trinity Electronics Systems Ltd=A0 =A0 Edmonton, AB, > CANADA > (780) 489-3199 voice=A0 =A0 =A0 =A0 =A0 > (780) 487-6397 fax > www.trinity-electronics.com > Custom Electronics Design and Manufacturing > = > -- = > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > = = -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist