[McHUG] TX Modules Need Further Inspection

[n3sb at qis.net]

Hi Pete;

Thanks for the links. I'll give them a close look. At some point I'm going to
want to have a small, inexpensive, low power receiver or transceiver on 145.030
MHz to go with this Arduino packet module. Maybe an SI-571 is a good way to get
there.

73; Steve, N3SB

Quoting Peter Morton <mortonph at comcast.net>:

> Fell asleep in my Lazy Boy, woke up and wrote my first reply.  Shouldn't do 
> that until I'm fully awake.  Anyway, it should be +/-150 KHz, not +/-75 KHz,
> 
> deviation at 433 MHz with 2 volt peak-to-peak Vc input.
> 
> Also, in the second paragraph, it should state: The RFM02, not RFM01.  The 
> RFM02 is a transmitter, RFM01 is a receiver.  (Both sell for $5.90 each.)
> 
> -Pete
> 
> ----- Original Message ----- 
> From: "Peter Morton" <mortonph at comcast.net>
> To: "MicroController Ham User Group - Physical Computing for Ham Radio" 
> <mchug at mailman.qth.net>; <pat at patkilroy.com>
> Sent: Tuesday, December 23, 2008 1:25 AM
> Subject: Re: [McHUG] TX Modules Need Further Inspection
> 
> 
> > Just thinking.
> >
> > The Si571 can be frequency modulated.  The voltage control input has a 10 
> > KHz bandwidth and the modulatation sensitivity can be set as high as 356 
> > ppm/V (about +/-75 KHz at 433 MHz with 2 volt peak-to-peak Vc input). 
> > You'll need about 15 dB gain following the Si571 to get 10 mW to the 
> > antenna (and harmonic filtering, of course).
> >
> > I assume you want FM in order to run packet.  If you can get away with 
> > FSK,
> > Hope RF (Beijing) makes a number of 433.92 MHz FSK transmitter modules 
> > (see http://www.hoperf.com/rf_fsk.asp).  Futurlec sells these modules. 
> > See: http://www.futurlec.com/Radio.shtml.  (The RFM01 sells for $5.90.)
> >
> > -Pete
> >
> > ----- Original Message ----- 
> > From: n3sb at qis.net
> > To: <pat at patkilroy.com>; "MicroController Ham User Group - Physical 
> > Computing for Ham Radio" <mchug at mailman.qth.net>
> > Sent: Monday, December 22, 2008 9:17 PM
> > Subject: Re: [McHUG] TX Modules Need Further Inspection
> >
> >
> > Hi Pat;
> >
> > The module I got from you appears to be a TX433B.
> >
> > These modules are really designed for On-Off Pulse modulation. We've been 
> > lucky
> > so far to get something out of them that can be heard on an FM receiver. 
> > It
> > would be nice to get FM out of one of these. That's one thing that needs 
> > to be
> > looked at further.
> >
> > Have a safe trip in 8-Land, and Happy Holidays!
> >
> > 73; Steve, N3SB
> >
> > Quoting Pat Kilroy <pat at patkilroy.com>:
> >
> >> Hi Steve,
> >>
> >> I more than loaned you the module, forgive me
> >> for the poor communication.  Consider it yours.
> >> But remind me *which* module or modules you have ...
> >>
> >> The TX433 is the flea power unit, 10mW output max.
> >> The TX433B module features 500mW but of course it
> >> comes with a "more battery" mass requirement.  (I
> >> always loved Rich's brilliant "double coin cell"
> >> idea in the original PICetSat module, so I won't
> >> give up on the smaller transmitter.)
> >>
> >> The B version also adds an extra pin, the E/D Pin,
> >> to Enable and Disable the xmtr itself or the audio
> >> input pin.
> >>
> >> Transmitter Web page:
> >> http://store.qkits.com/moreinfo.cfm/TX433B
> >>
> >> MAIN POINT
> >> I will give you, Rich and Pete either one or both
> >> types before I head to Eight Land for the holidays
> >> if you think you may have time to experiment with
> >> them and learn more about them.  After all, the
> >> spec sheet is lacking and customer support does
> >> not seem to exist.  We need more insight on these
> >> little devices!
> >>
> >> Guys, please let me know what you think of my
> >> offer.  I must get them to you soon.
> >>
> >> Cheers,
> >>
> >> Pat
> >>
> >> > -----Original Message-----
> >> [snip]
> >> >
> >> > Hi Pat;
> >> >
> >> > I have a couple TX-433 modules - one of which is a module you lent to 
> >> > me a
> >> > couple months ago. It'll be interesting to see if these modules can be
> >> coaxed
> >> > to send packet tones.
> >> >
> >> > 73; Steve, N3SB
> >> >
> >>
> >>
> >>
> >>
> >>
> >>
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> >
> >
> >
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