Alt-BEAM Archive
Message #08316
To: beam@sgiblab.sgi.com
From: "johannes urke" j_o_h_a_n_n_e_s_@hotmail.com
Date: Fri, 17 Dec 1999 08:05:19 CET
Subject: [alt-beam] Re: OT: Transmitter Crystals in Car Remotes.
whoa you mean that those silvery crystals are transmitters???
if you do then i have lots of receivers.
by the way i sent an complaint to wackyware and gave them the spammers
customer number hehe.
>From: "Ben Hitchcock"
>Reply-To: beam@sgiblab.sgi.com
>To: beam@corp.sgi.com
>Subject: Re: OT: Transmitter Crystals in Car Remotes.
>Date: Fri, 17 Dec 1999 08:55:01 +1100
>
>Hi,
>
> >From: "Jim Cook"
> >
> >
> >I have a few questions about these. I bought one surplus just to mess
>with.
> >They come apart easily and look like a durable PCB.
> >
> >But, does anybody know (A) Where the transmitter crystals are? Are they
>the
> >silver button thing? Or the diode looking things?
>
>There's usually only one, and it's silver. On most transmitters you can
>take out the crystals and replace them with another (close) frequency -
>that
>is if the unit is reasonably expensive. The cheap 2 channel
>non-proportional radios simply solder the crystal in so you can never
>replace it. But then it's intended not to be opened anyway. These usually
>operate with switches instead of pots (That's why they're
>non-proportional).
>
> >
> >And how might I find what frequency they transmit on?
>
>Look at the crystal. It usually has the frequency written on it. My
>Futaba
>4-channel proportional transmitter crystal has 29.825 written on it, so it
>operates at 29.825 MHz. in Australia there are two bands that you can
>transmit on for this purpose - 29 MHz and 27 MHz (CB radio).
>
>HTH,
>
>Ben
______________________________________________________
8317 Fri, 17 Dec 1999 03:12:29 -0800 (PST) [alt-beam] Re: OT: Transmitter Crystals in Car Remotes. beam@sgiblab.sgi.com Lee Golden Guys, I think you might be on the wrong track here...
If I'm not mistaken, Jim's original question was about
a Car Remote, one of those little doodads on a key
chain that you use to lock and unlock your doors, and
to arm a car alarm, etc., not a radio control unit for
an R/C car...right Jim?
Lee Golden
--- johannes urke
wrote:
> whoa you mean that those silvery crystals are
> transmitters???
> if you do then i have lots of receivers.
> by the way i sent an complaint to wackyware and gave
> them the spammers
> customer number hehe.
>
>
> >From: "Ben Hitchcock"
> >Reply-To: beam@sgiblab.sgi.com
> >To: beam@corp.sgi.com
> >Subject: Re: OT: Transmitter Crystals in Car
> Remotes.
> >Date: Fri, 17 Dec 1999 08:55:01 +1100
> >
> >Hi,
> >
> > >From: "Jim Cook"
> > >
> > >
> > >I have a few questions about these. I bought one
> surplus just to mess
> >with.
> > >They come apart easily and look like a durable
> PCB.
> > >
> > >But, does anybody know (A) Where the transmitter
> crystals are? Are they
> >the
> > >silver button thing? Or the diode looking things?
> >
> >There's usually only one, and it's silver. On most
> transmitters you can
> >take out the crystals and replace them with another
> (close) frequency -
> >that
> >is if the unit is reasonably expensive. The cheap
> 2 channel
> >non-proportional radios simply solder the crystal
> in so you can never
> >replace it. But then it's intended not to be
> opened anyway. These usually
> >operate with switches instead of pots (That's why
> they're
> >non-proportional).
> >
> > >
> > >And how might I find what frequency they transmit
> on?
> >
> >Look at the crystal. It usually has the frequency
> written on it. My
> >Futaba
> >4-channel proportional transmitter crystal has
> 29.825 written on it, so it
> >operates at 29.825 MHz. in Australia there are two
> bands that you can
> >transmit on for this purpose - 29 MHz and 27 MHz
> (CB radio).
> >
> >HTH,
> >
> >Ben
>
>
______________________________________________________
>
8318 Fri, 17 Dec 1999 07:08:52 EST [alt-beam] Re: This Is Really Funny !!! beam@sgiblab.sgi.com Blumojo13@aol.com SPAM SUX!!!!!!!!
Blumojo13
8319 Fri, 17 Dec 1999 12:01:56 -0700 [alt-beam] Step-up converter Ian Hi BEAMers, I just got my hands on a small batch or really nice solar cells
(try 6x more efficient than the SunCeram cells). The only problem is that
they are only on average .54v @ 324mA so I'm going to need some kind of
step-up DC-DC converter. I found some Maxim ones that will run off of .7v
but I'd like to be able to use a single cell. Does anyone know of a chip or
circuit that will convert .5v to 3.3v-5v??? Thanks for your help.
Laterz
--------
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